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160 results for “geochemical”
Disentangle the Sediment Mixing from Geochemical Proxies and Detrital Zircon Geochronology
<p>Supplementary Data of the Manuscript titled 'Disentangle the Sediment Mixing from Geochemical Proxies and Detrital Zircon Geochronology '</p>
Geochronological and geochemical data for Late Triassic granitic rocks in Central Qiangtang
<p>Supplementary Table 1. Zircon isotopic LA-ICP-MS analyses for the granitoid samples.</p> <p>Supplementary Table 2. Major (wt.%) and trace element (ppm) compositions of the granitoid samples.</p> <p>Supplementary Table 3. Hf isotopes of zircons of the granitoid samples.</p> <p>Supplementary Table 4. Summary of age data for the Late Triassic magmatic rocks and metamorphic rocks in the Central Qiangtang.</p>
Tectonic and magmatic evolution of NE Cathaysia Block controls sediment geochemical heterogeneity of rivers in SE China
<p>The supplementary data of the manuscript: <strong>Tectonic and magmatic evolution of NE Cathaysia Block controls sediment geochemical heterogeneity of rivers in SE China</strong></p>
Geochemical, timescales data in orthopyroxenes from Kizimen 2010 eruption and database of studies linking diffusion timescales with monitoring signals.
<p>This dataset comprises the geochemical data on whole rock analysis, melt inclusions, residual glasses, magnetites and orthopyroxenes in samples from the 2010 eruption of Kizimen volcano (Kamchatka), as well as the timescales modelled in the orthopyroxenes and a database of studies linking diffusion timescales with monitoring signals, associated with the publication: Ostorero, L., Balcone-Boissard, H., Boudon, G. <em>et al.</em> Correlated petrology and seismicity indicate rapid magma accumulation prior to eruption of Kizimen volcano, Kamchatka. <em>Commun Earth Environ</em> <strong>3</strong>, 290 (2022). https://doi.org/10.1038/s43247-022-00622-3</p> <p> </p>
A 4.7-myr record of geochemical scanning of a ferromanganese nodule
<p>The geochemical study of a ferromanganese nodule provides a 4.7-myr record of abyssal oxygenation in the Eastern Pacific.</p>
Geochemical Results of Mafic Blocks in Southern Ophiolitic Mélange in Luqu (Xigaze) Ophiolite from Yarlung-Tsangpo Suture Zone, Southern Tibet
<p><strong>Table S1</strong> Basic information of mafic rocks of southern ophiolitic mélange from Luqu section of the Xigaze ophiolite, YTSZ</p> <p><strong>Table S2</strong> Major and trace element compositions of mafic rocks of southern ophiolitic mélange from Luqu section of the Xigaze ophiolite, YTSZ</p> <p><strong>Table S3</strong> Sr-Nd-Hf isotope results of mafic rocks from southern ophiolitic mélange of Luqu section of the Xigaze ophiolite, YTSZ</p> <p><strong>Table S4</strong> Clinopyroxene EPMA results of mafic rocks from southern ophiolitic mélange of Luqu section of the Xigaze ophiolite, YTSZ</p> <p><strong>Table S5</strong> Clinopyroxene Laser Ablation-ICPMS results of mafic rocks from southern ophiolitic mélange of Luqu section of the Xigaze ophiolite, YTSZ</p> <p><strong>Table S6</strong> Amphibole EPMA results of mafic rocks from southern ophiolitic mélange of Luqu section of the Xigaze ophiolite, YTSZ</p> <p><strong>Table S7</strong> Amphibole Laser Ablation-ICPMS results of mafic rocks from southern ophiolitic mélange of Luqu section of the Xigaze ophiolite, YTSZ</p> <p><strong>Table S8</strong> Plagioclase EPMA results of mafic rocks from southern ophiolitic mélange of Luqu section of the Xigaze ophiolite, YTSZ</p> <p><strong>Table S9</strong> Zircon SIMS U-Pb dating results of mafic rocks from southern Luqu mélange</p> <p><strong>Table S10 </strong>Zircon Hf-O isotopes of mafic rocks from southern ophiolitic mélange of Luqu section of the Xigaze ophiolite, YTSZ</p> <p><strong>Table S1</strong> Basic information of mafic rocks of southern ophiolitic mélange from Luqu section of the Xigaze ophiolite, YTSZ</p> <p><strong>Table S2</strong> Major and trace element compositions of mafic rocks of southern ophiolitic mélange from Luqu section of the Xigaze ophiolite, YTSZ</p> <p><strong>Table S3</strong> Sr-Nd-Hf isotope results of mafic rocks from southern ophiolitic mélange of Luqu section of the Xigaze ophiolite, YTSZ</p> <p><strong>Table S4</strong> Clinopyroxene EPMA results of mafic rocks from southern ophiolitic mélange of Luqu section of the Xigaze ophiolite, YTSZ</p> <p><strong>Table S5</strong> Clinopyroxene Laser Ablation-ICPMS results of mafic rocks from southern ophiolitic mélange of Luqu section of the Xigaze ophiolite, YTSZ</p> <p><strong>Table S6</strong> Amphibole EPMA results of mafic rocks from southern ophiolitic mélange of Luqu section of the Xigaze ophiolite, YTSZ</p> <p><strong>Table S7</strong> Amphibole Laser Ablation-ICPMS results of mafic rocks from southern ophiolitic mélange of Luqu section of the Xigaze ophiolite, YTSZ</p> <p><strong>Table S8</strong> Plagioclase EPMA results of mafic rocks from southern ophiolitic mélange of Luqu section of the Xigaze ophiolite, YTSZ</p> <p><strong>Table S9</strong> Zircon SIMS U-Pb dating results of mafic rocks from southern Luqu mélange</p> <p><strong>Table S10 </strong>Zircon Hf-O isotopes of mafic rocks from southern ophiolitic mélange of Luqu section of the Xigaze ophiolite, YTSZ</p>
Mg and Fe isotopes and other geochemical data for Gangdese arc mafic plutonic rocks and trench sediments
<p>These files content unpublished Mg and Fe isotopes and other geochemical data for the Gangdese arc mafic plutonic rocks and trench sediments.</p>
Data set for "Tectonic evolution of the Tibetan Plateau during the late Cretaceous to early Eocene: Insights from geochemical records in the Fenghuoshan Group, Hoh Xil Basin"
<p>The mineral compositions, major and trace element gechemical data for the sediements from Fenghuoshan Group, Hoh Xil Basin.</p>
Wrangell Arc, Alaska (U.S.A.) clast geochemical data - Table S1
<p>Supplemental bulk rock major-trace element geochemical data, 40Ar/39Ar ages, and sample locations for modern river clasts (from Wrangell Arc, Alaska, USA). </p>
Supplement to: Early Cretaceous climate for the southern Tethyan Ocean: insights from the geochemical and paleoecological analyses of extinct cephalopods
<p>One file (excel) containing XRPD results and Table S1-S6 with details of the clumped isotope, stable carbon isotope, and trace elements analyses that refers to the manuscript.</p>
Supplement to: Early Cretaceous climate for the southern Tethyan Ocean: insights from the geochemical and paleoecological analyses of extinct cephalopods
<p>One file (excel) containing XRPD results and Table S1-S6 with details of the clumped isotope, stable carbon isotope, and trace elements analyses that refers to the manuscript.</p>
Cleveland Shale geochemical data
<p>Supplementary data for Geochemistry, Geophysics, Geosystems publication "<strong>Geochemical and hydrographic evolution of the Late Devonian Appalachian Seaway: Linking sedimentation, redox, and salinity across time and space"</strong>.</p>
Paleohydraulic Reconstructions, Geochemical Signals and Intermittency Estimates from the Middle Eocene Escanilla Formation, Spain
<p>The Earth’s surface undergoes changes over time due to various factors such as changes in climatic processes, sea level, and tectonic activity. These changes occur gradually and often go unnoticed to the human eye but are left behind as evidence in the form of sedimentary layers and erosional patterns that can be studied over geological time periods. For instance, ancient fluvial deposits are important archives of past changes and investigating their different aspects has implications for understanding past climate and landscape evolution. This doctoral thesis is focussed on the Middle Eocene (∼40 Ma) aged Escanilla Formation in the south-central Pyrenees, Spain, and is a compilation of 4 different studies. The first study documents how ancient riverbed systematically evolved from lower slopes in coarser-grained high amalgamation (HA) intervals, and higher slopes in finer-grained low amalgamation (LA) intervals. These changes were primarily driven by climate-controlled water discharge variations rather than base level changes. The second study presents a comprehensive geochemical record of the Middle Eocene Climatic Optimum (MECO), a global warming event that occurred at ∼40 Ma, using a suite of sampled paleosols, fluvial stromatolites, and pedogenic nodules. Geochemical proxies include carbon and oxygen stable isotopes, weathering indices, mean annual precipitation, clumped isotope temperature and clay mineralogy. Based on the regional preservation of the MECO and the climate, this study highlights fluvial sedimentary successions as interesting terrestrial archives of past changes in global climate. The third study explores a relationship between water discharge, sediment flux variability, and changing fluvial stratigraphic architecture with results indicating that HA intervals were most likely deposited under more intermittent and short-lived, intense precipitation events, while LA intervals were the result of less intermittent flows throughout the year. These estimates are consistent with values from modern ephemeral rivers typically found in arid to semi-arid climatic conditions, and highlight the connection between hydroclimate, river morphodynamics, and landscape evolution. Finally, the fourth study, explores a potential relationship between the MECO and a continental arc flare-up as a source of pCO2. An increase in mercury content relative to the MECO likely suggests a link between the two. Collectively, these studies provide new insights into the complex dynamics of past climate and landscape evolution, and have implications for interpreting ancient sedimentary deposits such as changes in fluvial stacking patterns, highlighting the importance of fluvial sedimentary successions as key archives of past global climate evolution and perturbations.</p>
On the biodiversity of diatom communities in lakes of east China: Geochemical effects dominated after eutrophication
<p><strong>Aim:</strong> Over the last century, lakes all over the world have experienced significant eutrophication and become more susceptible to critical transitions. This has prompted a growing need to understand how community dynamics shift following ecological perturbations. This study aims to elucidate the present status, spatial patterns and determinants of biological diversity, and how they have changed in response to alterations driven by eutrophication.</p> <p><strong>Location:</strong> Lakes of East China, mostly in the Yangtze River Basin</p> <p><strong>Taxa:</strong> Bacillariophyceae (163 species in 33 genres) </p> <p><strong>Methods:</strong> The environmental conditions of over sixty lakes were assessed based on parameters such as water quality, physical characteristics and biogeochemical constituents. Surface sediment samples and high-resolution sediment records were collected to quantify the biodiversity of diatom communities, and Principle Component Analysis (PCA) was used to determine the major environmental gradients. Meanwhile, linear regression, Canonical Correlation Analysis and Mantel tests were used to quantify the correlations between variables.</p> <p><strong>Results:</strong> Biodiversity metrics showed no distinct geographic patterns, although areas near large lakes showed comparatively high evenness. Smaller pairwise dissimilarities were observed among hypereutrophic lakes in comparison to lakes with a lower trophic status. The past century has witnessed a decrease in both pairwise dissimilarity and the standard deviation of Evenness. A significant statistical association was found between dissimilarity and ionic concentration and composition in the surface sediment of lakes, rather than nutrient levels.</p> <p><strong>Main conclusions:</strong> Following regional eutrophication and human disturbance, a significant reduction in biodiversity differentiation was observed in lakes located in East China. Currently, the dominant factor in determining the beta diversity of diatom communities is geochemical conditions rather than nutrient concentrations. Long-term stress caused by cultural eutrophication may also have altered the dominant determinant of regional biodiversity and diatom community dynamics.</p>
Neogloboquadrina pachyderma LA-ICP-MS spectral files and stable isotope data from: Geochemical differences between alive, uncrusted and dead, crusted shells of Neogloboquadrina pachyderma: Implications for paleoreconstruction
<p>Planktic foraminiferal-based trace element-calcium ratios (TE/Ca) are a cornerstone in paleoceanographic reconstructions. While TE-environment calibrations are often established through culturing experiments, shell growth in culture is not always consistent with growth in a natural setting. For example, many species of planktic foraminifera thicken their shell at the end of their life cycle, producing a distinct 'gametogenic' crust. Crust is common in fossil foraminifers, however, shells grown in culture do not often develop a thick crust. Here we investigate potential vital effects associated with the crusting process by comparing the trace element (Mg/Ca, Na/Ca, Ba/Ca, Sr/Ca, Mn/Ca, Zn/Ca) and stable isotope (δ<sup>13</sup>C, δ<sup>18</sup>O) composition of alive, fully mature, uncrusted shells to recently deceased, crusted shells of <em>Neogloboquadrina pachyderma</em> collected from the same plankton tows off the Oregon (USA) coast. We find that uncrusted (N = 55) shells yield significantly higher Ba/Ca, Na/Ca, Mn/Ca, and Sr/Ca than crusted (N = 66) shells, and crust calcite records significantly lower TE/Ca values for all elements examined. Isotopic mixing models suggest that the crust calcite accounts for ~40 to 70% of crusted shell volume. Comparison of foraminiferal and seawater isotopes indicate that <em>N. pachyderma</em> lives in the upper 90 m of the water column, and that crust formation occurs slightly deeper than their average living depth habitat. Results highlight the necessity to establish calibrations from crusted shells, as application of calibrations from TE-enriched uncrusted shells may yield attenuated or misleading paleoceanographic reconstructions.</p>
Geochemical and physical characterization of lithic raw materials in the Olduvai Basin, Tanzania
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Neogloboquadrina pachyderma LA-ICP-MS spectral files and stable isotope data from: Geochemical differences between alive, uncrusted and dead, crusted shells of Neogloboquadrina pachyderma: Implications for paleoreconstruction
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On the biodiversity of diatom communities in lakes of east China: Geochemical effects dominated after eutrophication
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Data from: A compendium of geochemical information from the Saanich Inlet water column
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Data from: Microstructural and geochemical evidence offers a solution to the cephalopod cameral deposits riddle
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.