Global and Planetary Change最新文献

{"title":"Refining paleoelevation estimates of the European Alps by simulating Middle Miocene climate and δ18O responses to diachronous surface uplift scenarios","authors":"Daniel Boateng ,&nbsp;Sebastian G. Mutz ,&nbsp;Katharina Methner ,&nbsp;Armelle Ballian ,&nbsp;Maud J.M. Meijers ,&nbsp;Andreas Mulch ,&nbsp;Todd A. Ehlers","doi":"10.1016/j.gloplacha.2025.104808","DOIUrl":"10.1016/j.gloplacha.2025.104808","url":null,"abstract":"<div><div>Estimates of past surface elevations are essential for understanding the evolution of the Earth's physiography and biodiversity distribution. Stable isotope paleoaltimetry is widely used to infer paleoelevation due to a robust systematic inverse relationship between elevation and isotopic composition (<span><math><msup><mi>δ</mi><mn>18</mn></msup><mi>O</mi></math></span>, <span><math><mi>δD</mi></math></span>) of meteoric waters (i.e., isotopic lapse rate). The difference in <span><math><msup><mi>δ</mi><mn>18</mn></msup><mi>O</mi></math></span> of paleo-meteoric water reconstructed from coeval proxy materials between adjacent low- and high-elevation sites (<span><math><mi>Δ</mi><msup><mi>δ</mi><mn>18</mn></msup><msub><mi>O</mi><mi>p</mi></msub></math></span>) is transformed into paleoelevation changes using such isotopic lapse rates (<span><math><mi>δ</mi></math></span>-<span><math><mi>δ</mi></math></span> approach). Most often, the isotopic lapse rate is assumed to be stationary through time and space and, therefore, relies on modern estimates to constrain paleoelevation changes. This study employs model-based sensitivity analysis to assess the spatio-temporal variability of the isotopic lapse rate of the European Alps and to quantify the magnitude of uncertainties in paleoelevation estimates associated with the use of modern isotopic lapse rates. We use the high-resolution isotope-tracking climate model to simulate the <span><math><msup><mi>δ</mi><mn>18</mn></msup><mi>O</mi></math></span> in precipitation (<span><math><msup><mi>δ</mi><mn>18</mn></msup><msub><mi>O</mi><mi>p</mi></msub></math></span>) response to Middle Miocene conditions (e.g., atmospheric CO2, palaeogeography) and diachronous west-to-east surface uplift propagating along the Alpine orogen. The simulated isotopic lapse rates become shallower by <span><math><mo>∼</mo></math></span>1.0 ‰ km⁻¹ in response to Middle Miocene conditions compared to the Pre-Industrial period and vary within the range of <span><math><mo>±</mo></math></span>1.5 ‰ km⁻¹ for the diachronous surface uplift scenarios of the Alps. Applying the simulated isotopic lapse rates to Miocene <span><math><mi>Δ</mi><msup><mi>δ</mi><mn>18</mn></msup><msub><mi>O</mi><mi>p</mi></msub></math></span> proxy reconstructions suggests an overestimation of Central Alps paleoelevation by <span><math><mo>∼</mo></math></span>1.5 km when using modern rainfall-based isotopic lapse rate across the Alps. However, the simulated Miocene isotopic lapse rates estimate aligns more closely with modern global river-based lapse rates, suggesting they are more suitable than rainfall-based estimates when a paleoclimate-constrained isotopic lapse rate is unavailable.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"251 ","pages":"Article 104808"},"PeriodicalIF":4.0,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143847970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The silicon isotopes of Permian biogenic cherts from the South China unveils marine silicon cycle response to the termination process of late Paleozoic ice age","authors":"Su Li ,&nbsp;Xu Yao ,&nbsp;Yaoqi Zhou ,&nbsp;Junsheng Nie","doi":"10.1016/j.gloplacha.2025.104821","DOIUrl":"10.1016/j.gloplacha.2025.104821","url":null,"abstract":"<div><div>There is a global chert accumulation event during the Permian period - Permian Chert Event (PCE, ∼280 Ma to 251 Ma), indicating large perturbations in the marine silicon cycle. The Permian also witnessed termination of Earth's penultimate icehouse (late Paleozoic ice age - LPIA, ∼340 Ma to ∼260 Ma), final assembly of the Pangea supercontinent and significant changes in biosphere. However, few studies have been focused on using these PCE cherts to understand the marine silicon cycle during this major environmental and climatic transition period. Here, we study the petrology, mineralogy and geochemistry of widespread cherts formed during the PCE period on the northeastern margin of the South China, which was located near the equator in the eastern Paleo-Tethys Ocean and isolated from the assembling Pangea supercontinent. Our studied period of the cherts is from ∼280 to ∼253 Ma and overlaps with the demise of LPIA. The petrologic, mineralogical and geochemical (silicon isotopes, oxygen isotopes, major and trace elements) results support that these studied Permian cherts are biogenic in origin. New and compiled silicon isotope data of biogenic cherts from South China generally show lowest δ³⁰Si values (−0.4 ‰ to 1.6 ‰, with an average of 0.5 ‰) during the coldest stage from 273 to 262 Ma in the middle Permian, highest δ³⁰Si values (0.4 ‰ to 2.5 ‰, with an average of 1.4 ‰) during the warm stage from ∼280 to 273 Ma of the early Permian and intermediate δ³⁰Si values (0.1 ‰ to 1.8 ‰, with an average of 0.9 ‰) during the warmest stage from ∼262 to 252 Ma in the late Permian. Comparing our results with previous records of tectonics, volcanic, marine lithium and strontium isotopes, we demonstrate the major controlling role of marine siliceous productivity on the silicon isotopes of these biogenic cherts. Our results of generally higher δ³⁰Si values in warm periods in contrast with lower values in cold periods indicate decreased oceanic dissolved silicon concentration and enhanced marine siliceous productivity in warming oceans, probably due to more nutrients supplied by enhanced costal upwelling during warm non-glacial periods. However, the silicon isotopes of the late Permian cherts from ∼262 to 252 Ma are probably also affected by continental weathering inputs. Our study provides a typical example of interpreting changes of silicon isotopes in biogenic cherts through major climatic transition period in terms of changes of oceanic siliceous biological productivity and provide insights into Permian marine silicon cycle during the termination process of late Paleozoic ice age.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"251 ","pages":"Article 104821"},"PeriodicalIF":4.0,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Decadal causes of the Wanli megadrought in northern China during the Ming Dynasty: Perspectives from the Pacific Ocean","authors":"Xuanchen Li ,&nbsp;Xiangyu Li ,&nbsp;Yong Liu ,&nbsp;Bo Sun ,&nbsp;Gebanruo Chen","doi":"10.1016/j.gloplacha.2025.104824","DOIUrl":"10.1016/j.gloplacha.2025.104824","url":null,"abstract":"<div><div>Climate change has profound implications for the social stability and societal crisis. The prominent Wanli megadrought (1585–1590 CE) had a profound impact on northern China and might contribute to the collapse of the Ming Dynasty. Despite its historical significance, the underlying mechanisms of the Wanli megadrought remain unclear. This study combines reconstruction and CESM Last Millennium Ensemble (CESM-LME) simulation to investigate the decadal-scale evolution of the Wanli megadrought. The reconstructed summer precipitation over much of northern China reveals a decadal Wanli megadrought period during 1581 and 1592 CE. The simulation reasonably reproduces the Wanli megadrought and associated climate fluctuations preceding and succeeding it on a decadal timescale. During the Wanli megadrought, simulated summer precipitation decreased from the Yangtze River to northern China, accompanied by anomalous air subsidence and anomalous cyclones over Northeast Asia and the subtropical western North Pacific. These circulation anomalies during the Wanli megadrought were mainly driven by warming around the Maritime Continent and cooling over the rest tropical Pacific on a decadal timescale, as evidenced by proxy data and simulation. These sea surface temperature (SST) changes caused the weakening of the East Asian summer monsoon through their influences on Walker circulation and inducing the decadal Pacific–Japan-like Rossby wave train propagated northward. Additionally, the phase shift of the PDO-like SST pattern may also contribute to the Wanli megadrought, aligning with several reconstructions, though more SST evidence is needed. Perspectives from the Pacific SST variability would enhance our understanding of the Wanli megadrought on a decadal timescale.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"251 ","pages":"Article 104824"},"PeriodicalIF":4.0,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143799065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Chemical weathering and its control mechanism in the Yarlung Zangbo drainage basin on the Tibetan Plateau","authors":"Mingyang Yu,&nbsp;Zhifei Liu,&nbsp;Yulong Zhao,&nbsp;Baozhi Lin","doi":"10.1016/j.gloplacha.2025.104819","DOIUrl":"10.1016/j.gloplacha.2025.104819","url":null,"abstract":"<div><div>Silicate weathering acts as a negative feedback that regulates the Earth's long-term climate by removing CO₂ from the atmosphere. However, maintaining a close balance in the global carbon cycle requires a timely response of weathering to the changing climate. Here, we investigate major and trace element contents of both silt (&lt;63 μm) and clay (&lt;2 μm) fractions of surface sediments collected at high spatial resolution along the course of the Yarlung Zangbo river system on the Tibetan Plateau to study the sensitivity of silicate weathering intensity to climate. We isolate the true weathering signals by defining the δα^AlE indices and δCIA to quantify the elemental fractionation between the clay and silt fractions. The results show increasing trends in δα^AlCa, δα^AlNa, δα^AlSr, δα^AlMg, and δCIA and a decreasing trend in δα^AlLi downstream (eastward) along the 1700-m-long river course of the Yarlung Zangbo. These findings reveal an increase in silicate weathering intensity in response to increasing temperature and precipitation from the interior to the eastern edge of the Tibetan Plateau. Combined with correlation analysis, we further infer that temperature is the primary controlling factor of silicate weathering intensity on the Tibetan Plateau, whereas precipitation plays a secondary role. Our study shows that silicate weathering intensity can respond sensitively to temperature changes in a low-temperature environment (∼0–10 °C) on the Tibetan Plateau at the present-day timescale. This highlights the potential of the Tibetan Plateau to buffer against the ongoing warming climate by enhancing chemical weathering.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"251 ","pages":"Article 104819"},"PeriodicalIF":4.0,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cadmium isotopic evidence for the redistribution and fate of cadmium during carbonate weathering","authors":"Yizhang Liu ,&nbsp;Jing Jing ,&nbsp;Yongxiang Zhang ,&nbsp;Chuanwei Zhu ,&nbsp;Ting Gao ,&nbsp;Zengping Ning ,&nbsp;Jing Sun ,&nbsp;Tangfu Xiao ,&nbsp;Chengshuai Liu","doi":"10.1016/j.gloplacha.2025.104820","DOIUrl":"10.1016/j.gloplacha.2025.104820","url":null,"abstract":"<div><div>The weathering of carbonate rocks releases considerable amounts of cadmium (Cd) thus posing potential risks to the ecosystem and human health. The biogeochemical cycling of Cd during weathering processes is poorly understood because of the absence of efficient tracers for Cd biogeochemical processes. In this study, the Cd isotope technique was applied to elucidate the redistribution and fate of Cd during carbonate weathering. The results showed that the weathering of Cd-rich limestone resulted in elevated Cd contents in soils (2.63–22.7 mg/kg) and plants (0.20–1.16 mg/kg). The chemical fractions of Cd in the overlying soils were dominated by Fe and Mn oxides, and organically-bound Cd increased with increasing organic matter content. The heavier Cd isotopic composition of bedrock (δ^114/110Cd: 0.38 ‰) than that of soil (0.23 ‰) demonstrated the loss of Cd during carbonate weathering. Minor isotope fractionation (∆^114/110Cd &lt; 0.20 ‰) observed in the paddy soil profiles coincides with the limited migration and redistribution of Cd during the development of paddy soil. Additionally, the retention of Cd from weathering fluid by Fe/Mn oxides and organic matter contributes to the enrichment of heavy Cd isotopes in soils. Furthermore, the positive correlation between δ^114/110Cd values and soil organic matter contents indicates the addition of Cd from the litter (δ^114/110Cd: 0.30–0.94 ‰). These results shed light on the response of Cd isotope signals to biogeochemical processes and the cycling of Cd during weathering processes.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"251 ","pages":"Article 104820"},"PeriodicalIF":4.0,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"No extinction in foraminifera during the Carnian Pluvial Episode (Late Triassic)","authors":"Zhe Li ,&nbsp;Xin Yang ,&nbsp;Jacopo Dal Corso ,&nbsp;Fengyu Wang ,&nbsp;Enhao Jia ,&nbsp;Xu Dai ,&nbsp;Zhiwei Yuan ,&nbsp;Xiangmin Chen ,&nbsp;Jiankang Lai ,&nbsp;Xing Li ,&nbsp;Xiaokang Liu ,&nbsp;Shouyi Jiang ,&nbsp;Bingjia Wang ,&nbsp;Kui Wu ,&nbsp;Daoliang Chu ,&nbsp;Huyue Song ,&nbsp;Li Tian ,&nbsp;Haijun Song","doi":"10.1016/j.gloplacha.2025.104817","DOIUrl":"10.1016/j.gloplacha.2025.104817","url":null,"abstract":"<div><div>The Carnian Pluvial Episode (CPE, Late Triassic, ∼234–232 Ma) was a major climate change characterized by intensified hydrological cycle, perturbations in the carbon cycle, global warming and ocean anoxia. The climate perturbation was coeval to significant biological changes, including extinctions and the emergence of new clades. Research on the climatic changes of the CPE has been conducted extensively across the Tethys domain. However, the high-resolution fossil investigation is very limited, limiting our understanding of the relationship between the CPE and biological changes. Here, we analyzed foraminiferal assemblages, their diversity and abundance in Erguan section of Guizhou (Paleotethys) and Quxia section of South Tibet (Neotethys). The results indicate that, although the global climate and marine environment changed dramatically during the CPE with a transient local impact on the communities, no significant extinctions are recorded among foraminifera in these regions. Foraminifera in Erguan section responded to the CPE mainly with a sharp decrease in diversity and abundance at the beginning of the episode, while in Quxia section they did not show obvious responses. The different biotic responses of foraminifera may reflect variable environmental conditions, such as varying degrees of warming, siliciclastic input and ocean anoxia in the two regions. Our results show that different marine organisms responded differently to the CPE, highlighting the complexity of the impact of Carnian climatic changes on living organisms.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"251 ","pages":"Article 104817"},"PeriodicalIF":4.0,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143792251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Variation of population and community ecology over large spatial scales in Ediacaran early animal communities","authors":"Emily G. Mitchell ,&nbsp;Nile P. Stephenson ,&nbsp;Princess A. Buma-at ,&nbsp;Lucy Roberts ,&nbsp;Sasha Dennis ,&nbsp;Charlotte G. Kenchington","doi":"10.1016/j.gloplacha.2025.104818","DOIUrl":"10.1016/j.gloplacha.2025.104818","url":null,"abstract":"&lt;div&gt;&lt;div&gt;The Ediacaran strata of Newfoundland, Canada (580–560 Ma) record some of the first animal communities. The in-situ preservation of these sessile organisms means that the positions and sizes of specimens on the bedding planes encapsulate their life-histories, enabling spatial analyses to reconstruct their ecological dynamics. However, it is not known how these Ediacaran ecological dynamics vary across large spatial scales. Fortunately, the E and G surfaces at Mistaken Point, Newfoundland (∼565 Ma) crop out at multiple locations, providing the opportunity to compare ecological dynamics between communities separated by large spatial scales (∼800 m). In this study, we collected data from two outcrops each of E and G surfaces using a combination of laser-line probe, LiDAR and photogrammetry. We mapped out Mistaken Point G surface over 7.22 m&lt;sup&gt;2&lt;/sup&gt;, finding 9 frondose taxa across 158 specimens Watern Cove East G surface across 154 m&lt;sup&gt;2&lt;/sup&gt; (93 m&lt;sup&gt;2&lt;/sup&gt; when fractures are excluded) finding 19 frondose taxa across 1320 specimens; and Watern Cove West E Surface across 20.02 m&lt;sup&gt;2&lt;/sup&gt;, finding 11 frondose taxa across 734 specimens. We compared the Watern Cove West E surface with previously collected data from Mistaken Point E Surface, which had 2977 specimens over 85.42 m&lt;sup&gt;2&lt;/sup&gt;. The two G outcrops exhibited remarkably similar community compositions, both dominated by &lt;em&gt;Bradgatia&lt;/em&gt; with high proportions of frondose rangeomorphs and arboreomorphs. In contrast, the compositions between the E surfaces were notably different, with Watern Cove West E surface showing relatively higher proportions of &lt;em&gt;Fractofusus&lt;/em&gt; and &lt;em&gt;Bradgatia&lt;/em&gt; and lower proportions of frondose taxa&lt;em&gt;.&lt;/em&gt; For comparisons of population ecology between the outcrops, only &lt;em&gt;Bradgatia&lt;/em&gt; (G) and &lt;em&gt;Fractofusus&lt;/em&gt; (E) populations occurred in sufficient numbers to enable spatial analyses. We quantified the spatial distributions using spatial point process analyses, finding for E surfaces that the &lt;em&gt;Fractofusus&lt;/em&gt; populations showed significantly similar spatial patterns, which indicated reproductive events. In contrast, on G surface, the &lt;em&gt;Bradgatia&lt;/em&gt; populations show remarkably different underlying processes, with the Watern Cove East population showing reproductive clusters on a background environmental heterogeneity, whereas the Mistaken Point population shows spatial segregation, indicating intra-specific competition. The Watern Cove East &lt;em&gt;Bradgatia&lt;/em&gt; have a much lower density than those on Mistaken Point, suggesting that the increased density leads to competition due to insufficient resources to maintain this higher density. In modern deep-sea benthic communities, increased population densities occur within communities when different areas are subject to different flow regimes, and so different nutrient flux. Our results suggest that the Ediacaran communities of Mistaken Point show variability in ecological dynamics,","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"251 ","pages":"Article 104818"},"PeriodicalIF":4.0,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143792252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Insights into infragravity waves in the Pacific Ocean derived from DONET observations","authors":"Hou-Sheng Cheng ,&nbsp;Emmy T. Chang ,&nbsp;Takashi Tonegawa ,&nbsp;Justin Y.T. Ko ,&nbsp;Yuancheng Gung","doi":"10.1016/j.gloplacha.2025.104810","DOIUrl":"10.1016/j.gloplacha.2025.104810","url":null,"abstract":"<div><div>Using continuous seismic data recorded by the broadband ocean bottom seismometer network of the Dense Ocean-floor Network system for Earthquakes and Tsunamis (DONET), this study examines the energy trends of infragravity (IG) waves propagating across the Pacific Ocean. The DONET stations, located in the Nankai seismogenic zone off the southern coast of Japan, are deployed at water depths ranging from approximately 1000 to 4000 m, providing a unique vantage point for IG wave observations. Spectral analysis of the data collected from 2017 to 2019 reveals that IG waves detected at DONET stations are confined to frequency bands between 0.005 and 0.03 Hz, with their peak frequencies and energy levels heavily influenced by water depth. Using cross-correlation beamforming and back-projection techniques, we identify that the primary excitation of IG waves traveling across the Pacific Ocean originates from the coastal zones of southwestern South America and the Pacific-facing side of Antarctica. Secondary excitation of IG waves, which can be generated both distantly and regionally along the Pacific Rim. In recent years, IG wave energy has been observed to be more influenced by dynamic weather events, such as tropical cyclones (TCs), than by seasonal variations. Our findings demonstrate that TCs amplify IG waves across all water layers and generate prolonged impacts that persist for several days after landfall. This highlights a notable interaction between TCs and ocean dynamics, offering novel insights into the behavior of IG waves during extreme weather events.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"251 ","pages":"Article 104810"},"PeriodicalIF":4.0,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In-situ and meteoric cosmogenic 10Be constraints on coupling chemical weathering and denudation in monolithologic catchments","authors":"Jia-Xin Zhang,&nbsp;Ye Yang,&nbsp;Kejun Dong,&nbsp;Sheng Xu","doi":"10.1016/j.gloplacha.2025.104806","DOIUrl":"10.1016/j.gloplacha.2025.104806","url":null,"abstract":"&lt;div&gt;&lt;div&gt;Deciphering Earth's surface denudation—encompassing both physical erosion and chemical weathering—is essential for understanding sediment flux and its impact on long-term carbon cycle. However, quantifying denudation and chemical weathering across different timescales remains challenging. Here, we combine the covariation of different fluxes derived from in-situ &lt;sup&gt;10&lt;/sup&gt;Be&lt;sub&gt;in&lt;/sub&gt; (quartz, 250–500 μm), the ratio of meteoric &lt;sup&gt;10&lt;/sup&gt;Be&lt;sub&gt;met&lt;/sub&gt; to mineral-weathered &lt;sup&gt;9&lt;/sup&gt;Be (fine grains, &lt; 63 μm), and water chemistry in granitic catchments from the northeastern China to identify the contribution of chemical weathering to overall denudation. Millennial-scale chemical weathering fluxes (&lt;em&gt;W&lt;/em&gt;&lt;sub&gt;bulk&lt;/sub&gt;) derived from the &lt;sup&gt;10&lt;/sup&gt;Be&lt;sub&gt;met&lt;/sub&gt;/&lt;sup&gt;9&lt;/sup&gt;Be ratio in authigenic phase capture signals from both the dissolved phase and the reactive phase (adsorbed onto or precipitated in secondary weathering products), ranging from 7.7 to 12.2 mm/kyr. Modern water chemical weathering fluxes (&lt;em&gt;W&lt;/em&gt;&lt;sub&gt;water&lt;/sub&gt;, 2.1–4.0 mm/kyr), which represent only the dissolved phase flux, are positively correlated with &lt;em&gt;W&lt;/em&gt;&lt;sub&gt;bulk&lt;/sub&gt; (R&lt;sup&gt;2&lt;/sup&gt; = 0.38) but are consistently lower. Assuming constant weathering fluxes over time, this correlation suggests that only one-third of the bulk weathering products are removed through water discharge. The weathering intensity, defined as the ratio of &lt;em&gt;W&lt;/em&gt;&lt;sub&gt;bulk&lt;/sub&gt; to in-situ &lt;sup&gt;10&lt;/sup&gt;Be&lt;sub&gt;in&lt;/sub&gt; denudation flux (&lt;em&gt;D&lt;/em&gt;&lt;sub&gt;in&lt;/sub&gt;), spans a wide range of 0.14–0.39, in contrast to the relatively narrow range of &lt;em&gt;W&lt;/em&gt;&lt;sub&gt;bulk&lt;/sub&gt;. This highlights the dominant influence of physical erosion in these catchments, likely reflecting a “kinetic limitation” on regional silicate chemical weathering. By integrating previously published global data on &lt;em&gt;D&lt;/em&gt;&lt;sub&gt;in&lt;/sub&gt; and &lt;em&gt;W&lt;/em&gt;&lt;sub&gt;bulk&lt;/sub&gt;, we find that &lt;em&gt;W&lt;/em&gt;&lt;sub&gt;bulk&lt;/sub&gt; scales linearly with &lt;em&gt;D&lt;/em&gt;&lt;sub&gt;in&lt;/sub&gt; in log-log space over three orders of magnitude (10–10&lt;sup&gt;4&lt;/sup&gt; t/km&lt;sup&gt;2&lt;/sup&gt;/yr). This relationship contrasts with the relationship between &lt;em&gt;W&lt;/em&gt;&lt;sub&gt;water&lt;/sub&gt; and &lt;em&gt;D&lt;/em&gt;&lt;sub&gt;in&lt;/sub&gt;, which shows highly limited weathering flux in uplands with high &lt;em&gt;D&lt;/em&gt;&lt;sub&gt;in&lt;/sub&gt;. The faster decline of &lt;em&gt;W&lt;/em&gt;&lt;sub&gt;water&lt;/sub&gt; compared to &lt;em&gt;W&lt;/em&gt;&lt;sub&gt;bulk&lt;/sub&gt; as &lt;em&gt;D&lt;/em&gt;&lt;sub&gt;in&lt;/sub&gt; increases suggests that &lt;em&gt;W&lt;/em&gt;&lt;sub&gt;water&lt;/sub&gt; is sensitive not only to &lt;em&gt;D&lt;/em&gt;&lt;sub&gt;in&lt;/sub&gt; but also to water discharge. To expand the application of &lt;sup&gt;10&lt;/sup&gt;Be&lt;sub&gt;met&lt;/sub&gt;/&lt;sup&gt;9&lt;/sup&gt;Be to any fine-grain Earth surface sample, unlike the strong dependence of &lt;sup&gt;10&lt;/sup&gt;Be&lt;sub&gt;in&lt;/sub&gt;-derived denudation fluxes on the presence of quartz minerals, we also estimate potential weathering intensity proxies such as the mobilized &lt;sup&gt;9&lt;/sup&gt;Be fraction in dissolved and reactive phases (&lt;span&gt;&lt;math&gt;&lt;msubsup&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mtext&gt;reac&lt;/mtext&gt;&lt;mmulti","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"251 ","pages":"Article 104806"},"PeriodicalIF":4.0,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The clay-sized Cr/Zn ratios as a lithology-constraint weathering fingerprint","authors":"Xianming Zhang ,&nbsp;Fei Ye ,&nbsp;Wanfu Zhao ,&nbsp;Xianqiang Meng ,&nbsp;Yongjun Jiang ,&nbsp;Wancang Zhao","doi":"10.1016/j.gloplacha.2025.104804","DOIUrl":"10.1016/j.gloplacha.2025.104804","url":null,"abstract":"<div><div>Chemical weathering of differential lithologies is the primary factor causing redistribution of the elements chromium (Cr) and zinc (Zn) in Earth's surface. Clay-sized fractions (&lt; 2 μm, CSFs) as the ubiquitous weathering products play a critical role in hosting Cr and Zn. However, currently inadequate knowledge of CSFs from sedimentary rocks to soils might hamper a clear understanding regarding Cr and Zn enrichment process in the derived soils across these regions, accordingly limiting the further deciphering of Cr/Zn ratios' geochemical signals. Here we analyzed the Cr and Zn among CSFs of carbonate rocks, clastic rocks and derived saprolites. The results illustrated the Cr and Zn abundance (48.6–181.8 mg kg⁻¹ and 98.2–219 mg kg⁻¹) in CSFs of sedimentary rocks, revealing that over 70 % Cr was constrained by phyllosilicates, while Zn dispersed among the mineral phases. These results confirmed the CSFs as the Zn and Cr-rich reservoirs in parent materials. In comparison, major Cr in CSFs remained stable during weathering, while up to 4.1-fold enrichment of Zn was observed among all clay-sized mineral phases in the saprolites derived from carbonate rocks, suggesting the Zn enrichment is linked to both the minerals-inheritance from parent rocks and secondary accumulation in CSFs. Furthermore, the comparison of Cr/Zn ratios of CSF indicated a substantial decline during the weathering of carbonate rocks (from 1.02 to 0.44), implying the Cr/Zn ratios of CSFs have potential to be a fingerprint sensitive to weathering of carbonate rocks.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"251 ","pages":"Article 104804"},"PeriodicalIF":4.0,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}