地球科学最新文献

{"title":"Does Eolian Flux to the Northwest Pacific Ocean Reflect Persistent Asian Interior Aridity on Orbital Timescales?","authors":"Qiang Zhang, Andrew P. Roberts, Zhengquan Yao, Xuefa Shi, Qingzhen Hao, Lixia Ju, Xu Tang, Jianxing Liu, Shuangchi Liu, Qingsong Liu","doi":"10.1029/2024gl112599","DOIUrl":"https://doi.org/10.1029/2024gl112599","url":null,"abstract":"Northwest Pacific sedimentary eolian dust flux records have long been used to make direct inferences about Asian interior aridity. However, factors other than aridity can impact dust production rate. We present here an integrated environmental magnetic, electron microscopic, sedimentologic, and geochemical investigation of eolian dust records from Northwest Pacific Ocean Drilling Program Hole 1207A between 1.0 and 1.5 Ma. Reconstructed fluxes of bulk eolian dust and illite, the predominant clay mineral (>72% proportion), are both higher and lower during glacials and interglacials, respectively. Lower illite chemical index values reflect stronger physical weathering during glacials. We attribute eolian flux peaks to increased availability of wind-erodible particles caused by enhanced physical weathering in dust source areas due to strengthened Asian interior glacial activity in response to glacial cooling. This evidence demonstrates that Northwest Pacific eolian flux does not only reflect persistent Asian interior aridity on orbital timescales.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"45 1","pages":""},"PeriodicalIF":5.2,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026608","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":"Modulation of Mode-Water Eddies on Upper Ocean Responses to Tropical Cyclones","authors":"Jue Ning, Xu Chen, Tao Wang, Qing Xu, Lixiao Xu","doi":"10.1029/2024gl112598","DOIUrl":"https://doi.org/10.1029/2024gl112598","url":null,"abstract":"The modulation of anticyclonic subsurface-intensified mode-water eddies (MWEs) on the oceanic physical and biological responses to tropical cyclones (TCs) is investigated using satellite measurements, in situ observations and numerical model outputs. Extreme cooling of the surface (4.2°C) and mixed-layer (2.3°C) is observed in a MWE, which can be remarkably stronger than those in adjacent cyclonic eddy and non-eddy environments. The special thermodynamic structure above the lens of MWEs, which would favor the TC-induced entrainment more efficiently, facilitates the elevation of substantial subsurface cold water. It also leads to increased mixed-layer salinity and deepening of the mixed-layer. Additionally, variations in nitrate and chlorophyll-a concentrations appear to be depressed and exhibit intricate multi-layer patterns due to TC-induced and MWE-influenced vertical processes. This study provides novel insights into the interactions between TCs and subsurface-intensified eddies.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"74 1","pages":""},"PeriodicalIF":5.2,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026614","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":"Slowed Response of Atlantic Meridional Overturning Circulation Not a Robust Signal of Collapse","authors":"C. C. Zimmerman, T. J. W. Wagner, E. A. Maroon, D. E. McNamara","doi":"10.1029/2024gl112415","DOIUrl":"https://doi.org/10.1029/2024gl112415","url":null,"abstract":"Using an idealized model of the Atlantic meridional overturning circulation (AMOC), we test whether changes in the statistical properties of an AMOC time series can reveal Critical Slowing Down (CSD) and serve as early warnings of an upcoming critical transition. We calculate CSD indicators for simulations across varying parameter regimes, investigating the system's steady-state dynamical structure and its evolution under gradual climate forcing. We find that the modeled AMOC features bistability for relatively weak gyre salinity exchange, but no bistability when the gyres are sufficiently strong. However, CSD indicators consistently warn of a collapse across the gyre strength parameter space, even when no bifurcations occur, thus raising false alarms. We argue that CSD should be applied cautiously in systems where the dynamical structure and physical response to forcing are not fully known (such as the AMOC), specifically where it is not a priori clear whether the system is in a multistable regime.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"1 1","pages":""},"PeriodicalIF":5.2,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026611","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":"Subduction-Related Volcanic Activity as a Proxy for Global Subduction Flux Over the Past Billion Years, and Its Correlation With Geomagnetic Superchrons","authors":"Jean Besse, Yves Gallet","doi":"10.1029/2024gl111360","DOIUrl":"https://doi.org/10.1029/2024gl111360","url":null,"abstract":"We investigate the frequency of subduction-related volcanic events over the past billion years. Our analysis reveals distinct peaks and troughs interpreted as significant fluctuations in global subduction flux. This approach has the advantage of being independent of paleogeographic reconstructions. However, it does not provide information on the spatial distribution of thermal heterogeneities at the core-mantle boundary. This likely explains why the long-term evolution of global subduction flux does not correlate in any simple way with the frequency of geomagnetic polarity reversals throughout the Phanerozoic. As an additional parameter, we suggest focusing on how variations in the Earth's inertia, due to changing subduction configurations over time, influence the thermal conditions at the core-mantle boundary and, consequently, the magnetic reversal frequency.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"28 1","pages":""},"PeriodicalIF":5.2,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026616","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":"Escalation of caldera unrest indicated by increasing emission of isotopically light sulfur","authors":"S. Caliro, G. Chiodini, R. Avino, A. Carandente, E. Cuoco, M. A. Di Vito, C. Minopoli, F. Rufino, A. Santi, J. Lages, A. Mangiacapra, B. Monteleone, L. Pappalardo, Z. Taracsák, C. Tramati, S. Vizzini, A. Aiuppa","doi":"10.1038/s41561-024-01632-w","DOIUrl":"https://doi.org/10.1038/s41561-024-01632-w","url":null,"abstract":"<p>Calderas are depressions formed by some of the largest volcanic eruptions. Their long-lived inter-eruptive periods are occasionally interrupted by phases of unrest, in which escalating seismicity, ground deformation and gas emissions raise concerns of potential volcano reawakening. However, interpretation of such physico-chemical signals is complicated by few examples of monitored unrest that culminated into eruption and by our fragmentary understanding of the drivers and timescales of caldera reactivation. Here we show that multi-decadal gas observations at the restless Campi Flegrei caldera in Italy record an unprecedented increase in isotopically light sulfur release from fumaroles since 2018. We then use hydrothermal gas equilibria and numerical simulations of magmatic degassing to propose that such a change in sulfur emissions results from decompression-driven degassing of mafic magma at ≥6 km depth, along with some extent of sulfur remobilization from hydrothermal minerals. Examination of a global dataset indicates that, despite the diversity in eruptive behaviour and tectonic setting, increasing sulfur output may be a common process during unrest escalation at calderas generally. Hence, our observations and models of sulfur behaviour may inform interpretations of unrest and hazard assessment at reawakening calderas and hydrothermal active volcanoes worldwide.</p>","PeriodicalId":19053,"journal":{"name":"Nature Geoscience","volume":"15 1","pages":""},"PeriodicalIF":18.3,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026620","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 persistence of grassland soil organic matter derived from litter and pyrogenic inputs","authors":"Sam J. Leuthold, Jennifer L. Soong, Rebecca J. Even, M. Francesca Cotrufo","doi":"10.1038/s41561-025-01638-y","DOIUrl":"https://doi.org/10.1038/s41561-025-01638-y","url":null,"abstract":"<p>The stabilization of carbon (C) and nitrogen (N) from organic inputs in soil organic matter constitutes a critical process in ecosystem biogeochemistry, yet the underlying mechanisms are not yet fully understood. Several frameworks have been proposed to explain particulate- and mineral-associated organic matter persistence, but a lack of long-term data has stymied their reconciliation. Here we present the results of an in-field incubation in a grassland in Kansas, USA, that followed ¹³C- and ¹⁵N-labelled plant litter and pyrogenic organic matter through the decomposition process and into soil organic matter fractions over the course of a decade. At the end of the experiment, 7.0% and 24.2% of the initial litter C and N, respectively, remained in the soil, while 60.8% and 54.4% of the initial pyrogenic organic matter C and N, respectively, remained. Litter-derived mineral-associated organic matter formed within the first year of litter decomposition, and 10-year sampling revealed that it had persisted relatively unchanged, in terms of both litter-derived C stocks and C:N ratio. These results provide further evidence that mineral-associated organic matter is stabilized via the sorption of soluble inputs and suggest that stabilization and persistence can occur largely independent of particulate organic matter dynamics.</p>","PeriodicalId":19053,"journal":{"name":"Nature Geoscience","volume":"2 1","pages":""},"PeriodicalIF":18.3,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026621","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":"Evidence for Magma-Rich and Magma-Poor Characteristics Across the Continent-Ocean Transition Offshore Central Nova Scotia as Deduced From Vp/Vs Ratios Using 4-Component Seismic Data","authors":"K. W. Helen Lau, Mladen R. Nedimović, Miao Zhang","doi":"10.1029/2024jb029569","DOIUrl":"https://doi.org/10.1029/2024jb029569","url":null,"abstract":"To improve identification of crustal rock types within the continent-ocean transition (COT) offshore Nova Scotia based on the standard approach of analyzing P-wave velocities (&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;p&lt;/i&gt;&lt;/sub&gt;), we incorporate S-wave velocity (&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;s&lt;/i&gt;&lt;/sub&gt;) modeling and determine &lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;p&lt;/i&gt;&lt;/sub&gt;/&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;s&lt;/i&gt;&lt;/sub&gt; ratios. In this work, we construct detailed layered &lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;p&lt;/i&gt;&lt;/sub&gt; and &lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;s&lt;/i&gt;&lt;/sub&gt; models using four component wide-angle ocean bottom seismometer data from profiles SMART-2 and -3 across the central and southwestern Scotian margin, respectively. Along profile SMART-3, the lower continental crust displays low &lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;p&lt;/i&gt;&lt;/sub&gt;/&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;s&lt;/i&gt;&lt;/sub&gt; ratios (&lt;span data-altimg=\"/cms/asset/1f5622e9-4e62-45fb-926e-c27372972bd8/jgrb57107-math-0001.png\"&gt;&lt;/span&gt;&lt;math altimg=\"urn:x-wiley:21699313:media:jgrb57107:jgrb57107-math-0001\" display=\"inline\" location=\"graphic/jgrb57107-math-0001.png\"&gt;\u0000&lt;semantics&gt;\u0000&lt;mrow&gt;\u0000&lt;mo&gt;∼&lt;/mo&gt;\u0000&lt;/mrow&gt;\u0000${sim} $&lt;/annotation&gt;\u0000&lt;/semantics&gt;&lt;/math&gt;1.7), akin to felsic granulite. &lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;p&lt;/i&gt;&lt;/sub&gt;/&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;s&lt;/i&gt;&lt;/sub&gt; ratios (1.7–1.9) within the COT suggest that syn-rift volcanism and magmatism resulted in a basalt-dominated upper crust overlying a thick layer (4–10 km) of laterally heterogeneous gabbroic underplate that jointly cover an estimated profile area of &lt;span data-altimg=\"/cms/asset/d70facb0-48a6-4b24-83fc-80f5bdf7a977/jgrb57107-math-0002.png\"&gt;&lt;/span&gt;&lt;math altimg=\"urn:x-wiley:21699313:media:jgrb57107:jgrb57107-math-0002\" display=\"inline\" location=\"graphic/jgrb57107-math-0002.png\"&gt;\u0000&lt;semantics&gt;\u0000&lt;mrow&gt;\u0000&lt;mo&gt;∼&lt;/mo&gt;\u0000&lt;/mrow&gt;\u0000${sim} $&lt;/annotation&gt;\u0000&lt;/semantics&gt;&lt;/math&gt;1,230 &lt;span data-altimg=\"/cms/asset/d917ce02-0d0e-4d81-bf6e-417aa44e12d6/jgrb57107-math-0003.png\"&gt;&lt;/span&gt;&lt;math altimg=\"urn:x-wiley:21699313:media:jgrb57107:jgrb57107-math-0003\" display=\"inline\" location=\"graphic/jgrb57107-math-0003.png\"&gt;\u0000&lt;semantics&gt;\u0000&lt;mrow&gt;\u0000&lt;msup&gt;\u0000&lt;mtext&gt;km&lt;/mtext&gt;\u0000&lt;mn&gt;2&lt;/mn&gt;\u0000&lt;/msup&gt;\u0000&lt;/mrow&gt;\u0000${text{km}}^{2}$&lt;/annotation&gt;\u0000&lt;/semantics&gt;&lt;/math&gt;. On Profile SMART-2, we observe upper continental crust (&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;p&lt;/i&gt;&lt;/sub&gt;/&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;s&lt;/i&gt;&lt;/sub&gt; &lt;span data-altimg=\"/cms/asset/c7d2b60d-3db6-4d3e-8d87-c910351b0a48/jgrb57107-math-0004.png\"&gt;&lt;/span&gt;&lt;math altimg=\"urn:x-wiley:21699313:media:jgrb57107:jgrb57107-math-0004\" display=\"inline\" location=\"graphic/jgrb57107-math-0004.png\"&gt;\u0000&lt;semantics&gt;\u0000&lt;mrow&gt;\u0000&lt;mo&gt;&lt;&lt;/mo&gt;\u0000&lt;/mrow&gt;\u0000${&lt; } $&lt;/annotation&gt;\u0000&lt;/semantics&gt;&lt;/math&gt; 1.7) with highly felsic composition within the continental and the COT domains. Serpentinized mantle (&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;p&lt;/i&gt;&lt;/sub&gt;/&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;s&lt;/i&gt;&lt;/sub&gt; &lt;span data-altimg=\"/cms/asset/b91b9619-ed3a-4c8a-a1e7-7644e81597c0/jgrb57107-math-0005.png\"&gt;&lt;/span&gt;&lt;math altimg=\"urn:x-wiley:21699313:media:jgrb57107:jgrb57107-math-0005\" display=\"inline\" location=\"graphic/jgrb57107-math-0005.png\"&gt;\u0000&lt;semantics&gt;\u0000&lt;mrow&gt;\u0000&lt;mo&gt;&gt;&lt;/mo&gt;\u0000&lt;/mrow&gt;\u0000${ &gt;} $&lt;/annotation&gt;\u0000&lt;/semantics&gt;&lt;/math&gt; 1.9) is interpreted within","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"25 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New insights into the molecular characteristics-dependent light absorption variation of water-soluble organic matter in biomass burning smoke","authors":"Weifeng Chen, Huiying Zhang, Shiming Xu, Hui Jia, Zhichong Qi, Usman Farooq, Zhigeng Wang, Qin Dai","doi":"10.1016/j.atmosres.2025.107951","DOIUrl":"https://doi.org/10.1016/j.atmosres.2025.107951","url":null,"abstract":"Forest fire (mainly wood burning) and crop residue burning (mainly herb burning) are two ways to produce biomass burning smoke water-soluble organic matters (BBS-WSOMs), largely altering atmospheric light absorption. However, their molecular characteristics-dependent light absorption remains unknown. Hence, this study combined Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) analysis with UV–Vis spectrum to deeply investigate the different molecules-dependent light absorption of wood- and herb-derived BBS-WSOMs from different burning temperatures. The results showed that at the tested burning temperatures (300 and 600 °C), biomass types showed a stronger influence on the light absorption at 200–550 nm than burning temperatures. Herb-derived BBS-WSOMs had a stronger light absorption than wood-derived BBS-WSOMs. This was because in herb-derived BBS-WSOMs, more conjugated diene structures or more CHO compounds of low molecular mass and high aromaticity were responsible for their light absorption at 200–300 nm, and more CHON compounds (mainly nitroaromatics compounds) were responsible for their light absorption at 365–550 nm. The CHO/CHOS compounds in wood-derived BBS-WSOMs and CHON compounds in herb-derived BBS-WSOMs were respectively responsible for their light absorption at 365–550 nm. Interestingly, O-containing groups played an increasingly important role in enhancing light absorption with the increasing wavelength at 220–275 nm, while highly aliphatic structure with low O content played an increasingly important role in enhancing light absorption with the increasing wavelength at 365–550 nm. This study is beneficial for deeply understanding the different molecules-dependent light absorption of BBS-WSOMs, having significant implications in atmospheric environment management and quality control.","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"72 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143027308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unravelling the mechanisms underlying marine redox shifts during sedimentary manganese metallogenesis: insights from the Carboniferous Muhu deposit, China","authors":"Zhi-Guo Dong, Bang-Lu Zhang, Lian-Chang Zhang, Fei-Yu Dong, Jie Li, Zi-Dong Peng, Bo Wan, Chang-Le Wang","doi":"10.1007/s00126-024-01343-7","DOIUrl":"https://doi.org/10.1007/s00126-024-01343-7","url":null,"abstract":"<p>Sedimentary manganese (Mn) mineralization requires a switch between anoxic and oxic water column conditions, which is commonly explained by the “bathtub ring” model and more recently interpreted by the emerging “episodic ventilation” model. To date, however, it remains unclear regarding how to distinguish between these two mechanisms, profoundly influencing Mn ore prospecting. Here, we conducted a comprehensive investigation on the Muhu Mn deposit in northwestern China. The upward lithological variations from breccia-dominated to fine-grained siliciclastic units (e.g., black shales) are typical of sequence characteristics of rifted basins. Black shales were deposited in deep waters due to continued tectonic subsidence that resulted in hydrographic restriction and bottom water euxinia, as indicated by their high ratios of Fe_HR/Fe_T and Fe_Py/Fe_HR, as well as relatively low Mo/TOC ratios. The Mn ore beds are interbedded with black shales and consist of divalent Mn minerals (e.g., rhodochrosite). They display shale-normalized positive cerium anomalies and negative inorganic carbon isotopes and Mo isotopes, suggesting that these Mn carbonate minerals originated from the diagenetic conversion of primary buried Mn oxides deposited under oxic benthic conditions. Taken together, the intimate spatial association between Mn ore beds and black shales records a dynamic temporal redox change. Such a redox shift is consistent with the “episodic ventilation” scenario, where incursions of oxygenated seawater triggered the deposition of initial Mn oxides. In contrast with the “bathtub ring” model, the ventilation scenario represents distinct spatial-temporal configurations of redox-hydrological conditions. Therefore, deciphering the detailed redox variations of Mn-hosting sedimentary successions, in conjunction with paleogeographic reconstruction, is the key to distinguishing between these two mechanisms.</p>","PeriodicalId":18682,"journal":{"name":"Mineralium Deposita","volume":"32 1","pages":""},"PeriodicalIF":4.8,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143020306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Long-lived partial melt beneath Cascade Range volcanoes","authors":"Guanning Pang, Geoffrey A. Abers, Seth C. Moran, Weston A. Thelen","doi":"10.1038/s41561-024-01630-y","DOIUrl":"https://doi.org/10.1038/s41561-024-01630-y","url":null,"abstract":"<p>Quantitative estimates of magma storage are fundamental to evaluating volcanic dynamics and hazards. Yet our understanding of subvolcanic magmatic plumbing systems and their variability remains limited. There is ongoing debate regarding the ephemerality of shallow magma storage and its volume relative to eruptive output, and so whether an upper-crustal magma body could be a sign of imminent eruption. Here we present seismic imaging of subvolcanic magmatic systems along the Cascade Range arc from systematically modelling the three-dimensional scattered wavefield of teleseismic body waves. This reveals compelling evidence of low-seismic-velocity bodies indicative of partial melt between 5 and 15 km depth beneath most Cascade Range volcanoes. The magma reservoirs beneath these volcanoes vary in depth, size and complexity, but upper-crustal magma bodies are widespread, irrespective of the eruptive flux or time since the last eruption of the associated volcano. This indicates that large volumes of melts can persist at shallow depth throughout eruption cycles beneath large volcanoes.</p>","PeriodicalId":19053,"journal":{"name":"Nature Geoscience","volume":"49 1","pages":""},"PeriodicalIF":18.3,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143020453","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}