Earth and Planetary Science Letters最新文献

{"title":"Moho depth (crustal thickness) variations under the northeastern midcontinent of North America, based on H-κ−c receiver-function analysis","authors":"Hongyu Xiao ,&nbsp;Stephen Marshak ,&nbsp;Michael DeLucia ,&nbsp;Xiaodong Song","doi":"10.1016/j.epsl.2025.119289","DOIUrl":"10.1016/j.epsl.2025.119289","url":null,"abstract":"<div><div>Previous studies of crustal thickness variation in the cratonic platform and bordering foreland basin of the USA Midcontinent emphasize that Moho relief exceeds topographic relief by an order of magnitude and exceeds structural relief of the Great Unconformity (the Phanerozoic-Precambrian contact) by a factor of 2 to 3. Consequently, the Moho displays significant local slopes. Unfortunately, traditional receiver-function analysis of depth to the Moho can lead to inaccurate results when applied to steeply sloping Moho. Therefore, to decrease measurement uncertainty due to slopes, we applied the recently developed H-κ-c receiver-function method (Li et al., 2018) to the northern and part of the eastern Midcontinent of the United States to produce a higher-resolution map of Moho-depth (i.e., crustal thickness) variation. Results for the central Midcontinent (including the Ozark Plateau and southern Illinois Basin) were reported in Xiao et al. (2022). Here, we extend our coverage eastward and northward, across the Michigan Basin, Grenville front, and western Appalachian Basin.</div><div>Our results emphasize that crustal thickness varies by almost 13 km in a region of North America where land-surface varies by less than 0.5 km and where relief of the Great Unconformity varies by a maximum of 7.5 km. In contrast to contemporary orogenic belts, crustal thickness does not correlate directly with either land-surface elevation or with sedimentary cover thickness (i.e., depth to the Great Unconformity). For example, the thickest crust of the study area occurs in the southwestern Illinois Basin, where land surface elevation is about 150 m, and the thinnest crust occurs in north central Indiana, where land-surface elevation is 250 m. There is a rough correspondence between crustal thickness and epeirogenic structures. In general, thinner crust underlies domes and arches, whereas thicker crust underlies basins, but there are exceptions. For example, while crust is relatively thin beneath the Kankakee and Cincinnati Arches, it is relatively thick beneath the Findlay Arch and the Wisconsin Arch, crust beneath the Michigan basin, overall, is thinner than that of the Illinois or Appalachian basins, and crust beneath the Canadian Shield is thinner than that beneath the cratonic platform. Notably, the Moho beneath the Canadian Shield and beneath the cratonic platform west of the Grenville front, displays roughly periodic long-wavelength north-south trending undulations. These undulations do not coincide with Precambrian tectonic fabrics or crustal boundaries, hinting that they developed after crustal assembly and could instead reflect variable degrees of thinning, underplating, or crustal delamination during failed Proterozoic rifting, or perhaps of crustal buckling associated with the Grenville collision.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"658 ","pages":"Article 119289"},"PeriodicalIF":4.8,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684690","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":"Dual clumped isotopes reveal an out-of-equilibrium state in shallow-water carbonate sediments on Great Bahama Bank","authors":"Chaojin Lu ,&nbsp;Megan E. Moore ,&nbsp;Peter K. Swart","doi":"10.1016/j.epsl.2025.119322","DOIUrl":"10.1016/j.epsl.2025.119322","url":null,"abstract":"<div><div>While non-skeletal carbonate grains and muds precipitated on shallow-water platforms have been widely used to reconstruct past ocean temperatures and chemistry, the question remains as to what degree the geochemical signatures of carbonate sediments are in equilibrium with their original environments. To evaluate the extent of equilibrium, we have applied the dual clumped isotope proxy (Δ₄₇ and Δ₄₈) to surface sediments (aragonite &gt; 90 %, <em>n</em> = 150) ranging from mudstones (&lt; 63 μm) to non-skeletal grainstones from the Great Bahama Bank. While there is no statistical difference in the mean Δ₄₇ values of the various facies, there are very large ranges of Δ₄₇ values within each type (∼ 0.1 ‰) equivalent to a temperature uncertainty of 25 °C. Our Δ₄₈ data reveals an out-of-equilibrium state where the muddy sediments have more positive values than the equilibrium, while the grainy facies are more negative. The positive Δ₄₈ disequilibrium in the muds is proposed to be a result of the photosynthetic removal of CO₂ caused by the activity of cyanobacteria turns promotes the precipitation of calcium carbonate in the water column (whitings area). In contrast, the grainstones, that are mainly composed of peloids, show a negative Δ₄₈ disequilibrium resulting from the CO₂ absorption by a complex mixture of biogeochemical processes. Our findings highlight the importance of kinetic processes in shaping non-skeletal carbonate factories and defining their geochemistry.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"658 ","pages":"Article 119322"},"PeriodicalIF":4.8,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684691","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":"Limited water contents of wadsleyite and ringwoodite coexisting with hydrous minerals in cold subducting slabs","authors":"Takayuki Ishii ,&nbsp;Jintao Zhu ,&nbsp;Eiji Ohtani","doi":"10.1016/j.epsl.2025.119310","DOIUrl":"10.1016/j.epsl.2025.119310","url":null,"abstract":"<div><div>How water is distributed in a subducting slab is essential to understand water transport into the deep mantle and mechanisms of deep-focus earthquakes and slab deformation around the 660-km discontinuity. A recent experimental study demonstrated that water contents of olivine and wadsleyite coexisting with hydrous phase A is limited at upper mantle pressures, suggesting strong water partitioning to the hydrous phase. However, water distribution between nominally anhydrous and hydrous minerals at the deeper mantle is not investigated in detail. We determined water contents in wadsleyite and ringwoodite coexisting with hydrous phases down to transition-zone depths along cold slab temperatures. Wadsleyite coexisting with hydrous phase A has ∼200 ppm water at 14–16 GPa and 800 °C. At 21 GPa, ringwoodite coexisting with superhydrous phase B has 8–13 ppm water at 800 °C and 46 ppm at 900 °C. Thus, olivine and its high-pressure polymorphs are kinetically dry along cold slab core conditions even in a wet subducting slab. Slab deformation and stagnation around 660 km depth can be caused by grain-size reduction due to phase transitions of dry olivine and the presence of rheologically weak hydrous phases. The deepest earthquakes below 660 km depth can be caused by dehydration of hydrous phases.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"658 ","pages":"Article 119310"},"PeriodicalIF":4.8,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645122","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":"Zebra textures in fault-controlled, hydrothermal dolomite bodies: Coupled mechanisms of replacement, deformation, and cementation","authors":"Cole A. McCormick ,&nbsp;Ernest H. Rutter ,&nbsp;Hilary Corlett ,&nbsp;Matthew Steele-MacInnis ,&nbsp;Eivind Block Vagle ,&nbsp;Fiona Whitaker ,&nbsp;Cathy Hollis","doi":"10.1016/j.epsl.2025.119274","DOIUrl":"10.1016/j.epsl.2025.119274","url":null,"abstract":"<div><div>Fault-controlled, hydrothermal dolomitization typically involves the interaction of high pressure (P), high temperature (T) fluids with the surrounding host-rock. A striking feature of hydrothermal dolomite bodies is the pattern development and periodicity of zebra textures, whereby alternating units of replacement dolomite (RD) and saddle dolomite (SD) form symmetrical RD-SD/SD-RD patterns. Zebra textures are often considered to be diagnostic of these elevated P/T conditions, but the roles of mechanical deformation and the localization of strain during dolomitization have received limited attention. Here we evaluate the effect of P/T perturbations on the genesis of zebra textures, alongside how strain-hardening mechanisms promote their characteristic pattern development. Published fluid inclusion homogenization and carbonate clumped isotope temperatures were compiled from the literature and the offset between these data were used as a geobarometer. Based on these pore-fluid pressures, a series of rock deformation experiments were conducted to reproduce zebra textures in the laboratory. Cylindrical rock samples were held in an annealed copper jacket and deformed in axisymmetric extension. As the rock underwent tensile failure, the copper jacket locally deformed by intracrystalline plasticity, strain-hardened, and stabilized each opening-mode fracture. As a result, a succession of closely spaced fractures formed along the length of the sample. In natural geological settings, an analogous process is inferred, whereby dilatancy hardening, precipitation hardening, and the stress shadow effect promote the rhythmicity that is a defining feature of zebra textures. Lastly, the effects of P/T perturbations on the solubility of dolomite, for a range of different fluid compositions, were evaluated using the Pitzer aqueous model in PHREEQC. This interdisciplinary study presents novel insights into the geomechanical and hydrochemical interaction between metasomatic fluids and carbonate rocks, which are of critical importance to our understanding of carbonate-hosted ore deposits in sedimentary basins worldwide.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"658 ","pages":"Article 119274"},"PeriodicalIF":4.8,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645121","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":"Reexamination and reidentification of ocean oxygenation event in the wake of the Marinoan glaciation","authors":"Run Li ,&nbsp;Xiqiang Zhou ,&nbsp;Chuan Guo ,&nbsp;Taiyu Huang ,&nbsp;Zhenfei Wang ,&nbsp;Kang-Jun Huang ,&nbsp;Peng Peng ,&nbsp;Xiangli Wang ,&nbsp;Tongxuan Du ,&nbsp;Dingshuai Xue ,&nbsp;Yanhong Liu","doi":"10.1016/j.epsl.2025.119312","DOIUrl":"10.1016/j.epsl.2025.119312","url":null,"abstract":"<div><div>The earliest Ediacaran oceanic oxygenation event in the wake of the Marinoan glaciation defined as OOE-A (∼635–632 Ma) constitutes an integral component of the Neoproterozoic Oxygenation Event. It was largely identified based on high enrichments of redox-sensitive elements (RSEs) in the basal Ediacaran Doushantuo Formation in South China, but this proposal has been challenged on a global scale. Here, we reexamine the purported OOE-A through an integrative study of correlative successions across the shelf-to-basin transect in South China, along with records from other continents. Sedimentary and geochemical evidence, including iron speciation, RSE concentrations, organic carbon isotopes, and pyrite sulfur isotopes, collectively suggest an oxic shelf and an anoxic (intermittently euxinic) basin with a fluctuating chemocline around the upper slope environment in South China. Importantly, a diffusion-reaction model integrating sedimentation rates and authigenic RSE concentrations suggests that the discrepancies in RSE enrichment levels between the basal Ediacaran black shales of South China and northwestern Canada can be reconciled if seawater Mo and U concentrations were only 0.5–3 % and 1.5–6 % of their modern values, respectively. This finding contradicts the traditional viewpoint of the expansion of seawater RSE reservoirs in response to a widely oxygenated ocean, while emphasizing a non-negligible role of slow sedimentation rate in driving authigenic RSE enrichments in anoxic marine facies locally. From spatial and temporal perspectives, this study further refines the magnitude of the OOE-A in South China, characterizing it as a short-lived oxygenated shelf environment in a redox-stratified ocean. The reexamination of OOE-A offers new insights into understanding other documented oceanic oxygenation events, as well as the cause-and-effect relationship between marine oxygenation and biological evolution during the Neoproterozoic Oxygenation Event.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"658 ","pages":"Article 119312"},"PeriodicalIF":4.8,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642461","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 past and future geography of the Eastern Mediterranean constructed from GNSS observations","authors":"Dan McKenzie","doi":"10.1016/j.epsl.2025.119313","DOIUrl":"10.1016/j.epsl.2025.119313","url":null,"abstract":"<div><div>The seismic activity of the Alpine-Himalayan belt is distributed over a wider region than is that of most oceanic active belts, and its deformation cannot be described by the relative rotation of a small number of large rigid plates. One of the most active regions of this belt is the Eastern Mediterranean, which has been intensively studied using earthquake seismology and satellite geodesy. At present there is no agreement as to whether the observed kinematics should be described using a large number of microplates or by continuous deformation. The two approaches are combined here, by dividing the region into four large deformable patches whose relative velocity consists of two parts: a rigid rotation about a pole and a continuous distributed deformation. This description of the kinematics allows reconstruction of the past geography of the region and its elevation to be made relative to Eurasia taken to be fixed. The resulting displacements agree reasonably well with independent estimates of the displacements on the North and East Anatolian Faults, the length of the subducted slabs beneath the Aegean and Western Turkey, and paleomagnetic measurements of rotation. The principal force driving the deformation is the release of gravitational energy by the subduction of old oceanic lithosphere and rollback of the Hellenic Arc, not continental spreading. Projection of the displacements 8 Ma into the future shows how the Eastern Mediterranean will evolve to resemble the Western Mediterranean.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"658 ","pages":"Article 119313"},"PeriodicalIF":4.8,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645120","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":"Untangling the interplay among tectonics, climate, and erosion in the Himalayas using landscape evolution modeling","authors":"Yuqiang Li ,&nbsp;Xiaoping Yuan ,&nbsp;Charles M. Shobe ,&nbsp;Guillaume Dupont-Nivet ,&nbsp;Kai Cao","doi":"10.1016/j.epsl.2025.119305","DOIUrl":"10.1016/j.epsl.2025.119305","url":null,"abstract":"<div><div>The interplay between tectonic rock uplift and climatically modulated erosion governs landscape evolution and influences how mountain ranges affect climate, biogeochemical cycling, ecology, and biodiversity. The Himalayas, Earth's highest mountain range, have inspired a large body of work suggesting that Himalayan topography is primarily governed by southward-propagating tectonic deformation. Here, we use a new coupled surface process and orographic precipitation model to test this hypothesis, and to assess the extent to which orographic precipitation effects have modulated the influence of tectonics on Himalayan topography since the Neogene (<em>circa</em> 23 million years ago). The model is quantitatively constrained by observed topographic profiles, river profiles, precipitation profiles, erosion rates, and thermochronologic ages from eight major rivers. Results indicate that propagating rock uplift allows a maximum “no erosion” elevation of ∼20 km, and largely governs the formation of the present-day topography of the Himalayas, with a secondary role played by orographic-rainfall-influenced fluvial processes as suggested by erosion/uplift ratios of 60−70%. Modeled sediment fluxes from the orogen are 30–40 × 10⁶ m³/yr per 250-km width (i.e., approximately one drainage basin width). Our methods enable the integration of diverse observations to reconstruct how tectonics and climate have interacted to control the topographic evolution of mountain belts, and allow investigation into the long-term influence of important geomorphic process parameters.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"658 ","pages":"Article 119305"},"PeriodicalIF":4.8,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632149","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":"Isotopic evidence for oceanic barium cycling in the initial stage of the mesoproterozoic","authors":"Xing Li ,&nbsp;Peter W. Crockford ,&nbsp;Yafang Song ,&nbsp;Haoming Yin ,&nbsp;Wei Wei ,&nbsp;Xun Wang ,&nbsp;Yuntao Ye ,&nbsp;Zhenhua Jing ,&nbsp;Fang Huang ,&nbsp;Huajian Wang ,&nbsp;Jihua Hao","doi":"10.1016/j.epsl.2025.119314","DOIUrl":"10.1016/j.epsl.2025.119314","url":null,"abstract":"<div><div>Recent studies have revealed the possibility of fluctuations of oxygen in the atmosphere and oceans across the Mesoproterozoic Era. Such fluctuations may have provided the necessary foundation for the emergence and possible early diversification of eukaryotic organisms at this time. However, the current understanding of this apparent coevolution requires further constraints on the operation of the biosphere. Here we analyzed barium isotopic compositions (δ¹³⁸Ba) together with other geochemical proxies within marine carbonates from the Gaoyuzhuang Formation (∼1570 Ma) of the Yanliao Basin, North China Craton. Our δ¹³⁸Ba values are similar to those of modern marine pelagic barite, but are lower and less scattered compared to modern seawater δ¹³⁸Ba compositions. We interpret these new δ¹³⁸Ba data to reflect the δ¹³⁸Ba composition of early Mesoproterozoic seawater, at least at the sediment-water interface. Moreover, we do not observe any clear fluctuations in δ¹³⁸Ba values coincident with carbonate δ¹³C excursions. We interpret these observations as a response to the accumulation of dissolved barium in the low-sulfate Mesoproterozoic ocean and thus, a buffering of δ¹³⁸Ba against significant variation in response to local factors such as primary productivity which influence modern marine δ¹³⁸Ba profiles. Moreover, our calculations estimate a ratio of ≈ 4:1 of continental weathering to hydrothermal activity based on a steady-state box model. Furthermore, our simulations suggest that the residence time of barium was 10–100-fold longer in the early Mesoproterozoic ocean compared to the modern, implying a much more conservative behavior of Ba and its isotopes.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"658 ","pages":"Article 119314"},"PeriodicalIF":4.8,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628149","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":"Resolving mercury cycling and the role of volcanism during the Toarcian Oceanic Anoxic Event","authors":"Jinchao Liu ,&nbsp;Jian Cao ,&nbsp;Simon W. Poulton ,&nbsp;Wang Zheng ,&nbsp;Jiubin Chen ,&nbsp;Tianchen He ,&nbsp;Guang Hu ,&nbsp;Di Xiao","doi":"10.1016/j.epsl.2025.119323","DOIUrl":"10.1016/j.epsl.2025.119323","url":null,"abstract":"<div><div>The emplacement of the Ferrar large igneous province has been implicated as the ultimate driver of the Early Jurassic Toarcian Oceanic Anoxic Event (T-OAE). Mercury (Hg) systematics, alongside other lines of evidence, have been used to support this assumption, but controversy exists over the relative roles of volcanic versus terrestrial Hg inputs. Here, we investigate the Hg record in two cores that document a bathymetric transect across the lacustrine Sichuan Basin, China. Both cores are characterized by Hg accumulation during the Toarcian Oceanic Anoxic Event. However, observed negative correlations between Hg concentrations and geochemical indicators of water column sulfide availability suggest modification of primary Hg enrichments via redox-driven loss of Hg from the sediments. In addition, Hg isotope systematics show differing signals between the shallow and deep cores, indicative of increased inputs from terrestrial and atmospheric sources, respectively. These results suggest that regional factors exert a major control on Hg enrichments in sediments, which must be considered when utilizing Hg systematics to evaluate volcanic activity. However, our approach highlights that lacustrine systems do document an important role for atmospheric Hg deposition during the Toarcian Oceanic Anoxic Event, confirming that large-scale activity of the Ferrar large igneous province was a key driver of this major environmental perturbation.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"658 ","pages":"Article 119323"},"PeriodicalIF":4.8,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143629236","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":"Eccentricity and obliquity forcing of East Asian hydroclimate during the latest Cretaceous to early Paleocene","authors":"Xiaoyue Zhang ,&nbsp;David B. Kemp ,&nbsp;Ruiyao Zhang ,&nbsp;Robert A. Spicer ,&nbsp;Simin Jin ,&nbsp;Rui Zhang ,&nbsp;Ze Zhang ,&nbsp;Chunju Huang","doi":"10.1016/j.epsl.2025.119306","DOIUrl":"10.1016/j.epsl.2025.119306","url":null,"abstract":"<div><div>The latest Cretaceous to early Paleocene was characterized by a global ‘greenhouse’ climate, and may provide a useful analogue for understanding hydroclimate responses to elevated atmospheric CO₂ and temperature. However, a paucity of high-resolution and temporally well-constrained continental sedimentary records spanning this time interval hinders our understanding. We address this issue via a high-resolution paleoenvironmental analysis of a ∼1305 m thick terrestrial succession from the Asian interior (Gonjo Basin, Southeast Tibet). Cyclostratigraphic analysis of element abundance data, combined with a published magnetostratigraphy, allows us to establish an astronomical timescale spanning the latest Cretaceous to early Paleocene (∼69.4 Ma to ∼58.5 Ma) and investigate climatic variations at an orbital time-scale. We show that the paleoenvironment of the Gonjo Basin underwent two key transitions, with a shift from braided river conditions to floodplain-dominated conditions at ∼68.8 Ma, followed by a return to braided river conditions with likely high seasonality at ∼63.5 Ma. Eccentricity and obliquity forcing exerted a strong control on the regional hydrological cycle. We show that the relative strength of obliquity was likely amplified compared to coeval marine records. Obliquity may have modulated meridional heat and moisture transport into the Asian interior, which, combined with feedbacks from quasi-stable carbon reservoirs, mediated hydroclimate. This study improves our understanding of continental paleoclimate evolution in the latest Cretaceous to early Paleocene, and establishes the role and mechanisms of orbital forcing as a driver of hydrological cycle change in East Asia at this time.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"658 ","pages":"Article 119306"},"PeriodicalIF":4.8,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143611103","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}