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  • PANGAEA  (8)
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  • 1
    Publication Date: 2024-01-31
    Keywords: Bulk organic geochemistry; Calculated; Carbon, organic, total; China; Clumped isotope thermometry; Event label; Instrument; Latitude of event; Lithology/composition/facies; Longitude of event; OUTCROP; Outcrop sample; palynology; pedogenic carbonate; Plant wax; Reference/source; Sample ID; Section; stable isotope geochemistry; Stratigraphic height; Uniform resource locator/link to reference; Xining_Basin_Bingling_Shan; Xining_Basin_Caijia; Xining_Basin_Ledu; XRD; δ13C
    Type: Dataset
    Format: text/tab-separated-values, 1017 data points
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  • 2
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    PANGAEA
    In:  Supplement to: Koutsodendris, Andreas; Allstädt, Frederik J; Kern, Oliver A; Kousis, Ilias; Schwarz, Florian; Vannacci, Martina; Woutersen, Amber; Appel, Erwin; Berke, Melissa A; Fang, Xiaomin; Friedrich, Oliver; Hoorn, Carina; Salzmann, Ulrich; Pross, Jörg (2019): Late Pliocene vegetation turnover on the NE Tibetan Plateau (Central Asia) triggered by early Northern Hemisphere glaciation. Global and Planetary Change, 180, 117-125, https://doi.org/10.1016/j.gloplacha.2019.06.001
    Publication Date: 2024-04-25
    Description: To reconstruct the timing and underlying forcing of major shifts in the composition of terrestrial ecosystems in arid Central Asia during the late Cenozoic (past ~7 Ma), we carry out palynological analysis of lake sediments from the Qaidam Basin (NE Tibetan Plateau, China). Our results show that the steppe/semi-desert biomes dominating the Qaidam Basin experienced marked turnovers at ~3.6 and 3.3 Ma. Most notably, the younger of these turnover events is characterized by a two- to three-fold expansion of Artemisia at the expense of other steppe/semi-desert taxa. This turnover event led to the replacement of the Ephedraceae/Chenopodiaceae dominated and Nitraria-rich steppe/semi-deserts that were dominant in the Qaidam Basin during the Paleogene and abundant during the Miocene by Artemisia/Chenopodiaceae-dominated steppe/semi-deserts as they exist until today. The vegetation turnover events are synchronous with shifts towards drier conditions in Central Asia as documented in climate records from the Chinese Loess Plateau and the Central North Pacific Ocean. On a global scale, they can be correlated to early glaciation events in the Northern Hemisphere during the Pliocene. Integration of our palynological data from the Qaidam Basin with Northern Hemisphere climate-proxy and regional-scale tectonic information suggests that the uplift of the Tibetan Plateau posed ecological pressure on Central Asian plant communities, which made them susceptible to the effects of early Northern Hemisphere glaciations during the late Pliocene. Although these glaciations were relatively small in comparison to their Pleistocene counterparts, the transition towards drier/colder conditions pushed previously existing plant communities beyond their tolerance limits, thereby causing a fundamental reorganization of arid ecosystems. The Artemisia dominance since ~3.3 Ma resulting from this reorganization marks a point in time after which the Artemisia/Chenopodiaceae pollen ratio can serve as a reliable indicator for moisture availability in Central Asia.
    Keywords: Abies; Acer; AGE; Alnus; Apiaceae; Aridification; Artemisia; Artemisia/Chenopodiaceae ratio; Artemisia+Chenopodiaceae; Asteraceae undifferentiated; Betula; Brassicaceae; Buxus; Calligonum; CAME-II_Q-TIP; Campanulaceae; Cannabaceae; Carpinus/Ostrya; Carya; Caryophyllaceae; Cedrus; Centaurea-type; cf. Solanaceae; Chenopodiaceae; Convolvulaceae; Corylus; Counting, palynology; Crepis-type; Crossing Climatic Tipping Points - Consequences for Central Asia; Cupressaceae; Cyperaceae; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Echinops-type; Elaeagnaceae; Ephedraceae; Ericaceae; Euphorbiaceae; Event label; Fabaceae; Fagus; Fraxinus; Gentianaceae; Ilex; Juglans; Lamiaceae; Larix; Liliaceae; Lonicera; Matricaria-type; Neogene; Nitraria; Northern Hemisphere glaciation; Oleaceae; Picea; Pinaceae undifferentiated; Pinus; Plantaginaceae; Plumbaginaceae; Poaceae; Podocarpus; Pollen, aquatic; Pollen, total; Polygonaceae; Primulaceae; Pterocarya; Qaidam Basin; Qaidam paleolake; Quercus; Ranunculaceae; Rhamnaceae; Rosaceae; Rubiaceae; Rumex; Rutaceae; Salix; Saussurea-type; Saxifragaceae; Scabiosa; Scrofulariaceae; Senecio-type; SG-1; SG-1b; Tamaricaceae; Thalictrum; Tibetan Plateau; Tilia; Tsuga; Ulmus/Zelkova; Urticaceae; Valerianaceae; Varia; Vegetation dynamics
    Type: Dataset
    Format: text/tab-separated-values, 65219 data points
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  • 3
    Publication Date: 2024-06-12
    Description: Here we present paleo-environmental datasets derived from early Eocene sedimentary strata in the Xining Basin, China. The sedimentary rocks were formed in a terrestrial alluvial mudflat environment and the datasets include: 1) Pollen counts, 2) Bulk rock organic carbon content and δ13C values, 3) Plant wax compound specific (C27-C33) δ13C values, 4) Bulk mineralogy X-Ray Diffraction (XRD) data and 5) Carbonate (pedogenic and vadose-grown) δ13C and δ18O values as well as clumped isotopes (∆47 values). The latter also includes temperature reconstructions derived from the ∆47 values and soil water δ18O reconstructions derived from these temperatures and the carbonate δ18O values. Individual clumped isotope measurements of sample and standard replicates are shown in: 6) Clumped isotope replicate analyses. Samples were collected during four field campaigns in 2015, 2016, 2017 and 2018 and analyzed as part of the MAGIC project (ERC 649081) and the VeWA consortium by the LOEWE programme of the Hessen Ministry of Higher Education, Research and Arts, Germany. Samples were collected from the following outcrop sections: Bingling Shan (36.45°N, 101.98°E, 2360 m elevation), Caijia (36.62°N, 101.98°E, 2480 m elevation), Dazhai (36.44°N, 102.02°E, 2440 m elevation), East Xining (36.58°N, 101.90°E, 2285 m elevation ), Ledu (36.43°N, 102.38°E, ) and Xiejia (36.52°N, 101.87°E, 2450 m elevation).
    Keywords: Bulk organic geochemistry; Clumped isotope thermometry; palynology; pedogenic carbonate; Plant wax; stable isotope geochemistry; XRD
    Type: Dataset
    Format: application/zip, 6 datasets
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  • 4
    Publication Date: 2024-06-12
    Keywords: aff. Acer; aff. Betulaceae; aff. Caprifolicaceae; aff. Fagaceae; aff. Juglandaceae; aff. Pinaceae; Angiosperm, other; Angiosperm indeterminata; Angiosperms; Araliaceoipollenites; Broadleaved, temperate forest; Broadleaved, warm forest; Bulk organic geochemistry; Celtipollenites; cf. Engelhardia; cf. Euphorbiacidites; China; Classopollis; Clumped isotope thermometry; Coniferae, temperate forest; Counting, palynology; Cycadopites; Ephedripites spp.; Event label; Fraxinoipollenites; Graminidites; Group size; Heterocolpites; Ilexpollenites; Jianhanpollis; Labitricolpites; Laricoidites; Latitude of event; Liquidambarpollenites; Longitude of event; Magnolipollis; Nitraripollis spp.; OUTCROP; Outcrop sample; palynology; pedogenic carbonate; Pentapollenites; Piceapollenites; Plant wax; Pollen, steppe/desert; Proxapertites-type; Psilabrevitricolpites; Pteridophytes; Quercoidites sp.; Reference/source; Reworked; Salixpollenites spp.; Sample ID; Sapindaceidites cangxianensis; Sapindaceidites spp.; Sapotaceipollenites; Section; Spinizonocolpites; stable isotope geochemistry; Stratigraphic height; Subtotal; Tiliaepollenites; Total counts; Tricolporopollenites; Tsugaepollenites; Ulmipollenites spp.; Uniform resource locator/link to reference; Xining_Basin_Caijia; Xining_Basin_Dazhai; Xining_Basin_East_Xining; XRD
    Type: Dataset
    Format: text/tab-separated-values, 504 data points
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  • 5
    Publication Date: 2024-06-12
    Keywords: Average chain length, n-Alkanes, C14-C37; Average chain length, n-Alkanes, C25-C37; Bulk organic geochemistry; Carbon Preference Index; China; Clumped isotope thermometry; Event label; GASC; Gas chromatograph; Instrument; Latitude of event; Lithology/composition/facies; Longitude of event; n-Alkane C27, δ13C; n-Alkane C27, δ13C, standard deviation; n-Alkane C27, δD; n-Alkane C27, δD, standard deviation; n-Alkane C28, δ13C; n-Alkane C28, δ13C, standard deviation; n-Alkane C28, δD; n-Alkane C28, δD, standard deviation; n-Alkane C29, δ13C; n-Alkane C29, δ13C, standard deviation; n-Alkane C29, δD; n-Alkane C29, δD, standard deviation; n-Alkane C30, δ13C; n-Alkane C30, δ13C, standard deviation; n-Alkane C30, δD; n-Alkane C30, δD, standard deviation; n-Alkane C31, δ13C; n-Alkane C31, δ13C, standard deviation; n-Alkane C31, δD; n-Alkane C31, δD, standard deviation; n-Alkane C32, δ13C; n-Alkane C32, δ13C, standard deviation; n-Alkane C32, δD; n-Alkane C32, δD, standard deviation; n-Alkane C33, δ13C; n-Alkane C33, δ13C, standard deviation; n-Alkane C33, δD; n-Alkane C33, δD, standard deviation; OUTCROP; Outcrop sample; palynology; pedogenic carbonate; Plant wax; Reference/source; Sample ID; Section; stable isotope geochemistry; Stratigraphic height; Uniform resource locator/link to reference; Xining_Basin_Bingling_Shan; Xining_Basin_Caijia; XRD
    Type: Dataset
    Format: text/tab-separated-values, 753 data points
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  • 6
    Publication Date: 2024-06-12
    Description: Carbonate (pedogenic and vadose-grown) δ13C and δ18O values as well as clumped isotopes (∆47 values). The latter also includes temperature reconstructions derived from the ∆47 values and soil water δ18O reconstructions derived from these temperatures and the carbonate δ18O values.
    Keywords: According to Anderson et al. (2021); According to Kim and O'Neil (1997); Bulk organic geochemistry; Calculated; Calculated, see abstract; China; Clumped isotope thermometry; Comment; Event label; Instrument; Latitude of event; Lithology/composition/facies; Longitude of event; OUTCROP; Outcrop sample; palynology; pedogenic carbonate; Plant wax; Reference/source; Replicates; Sample ID; Section; stable isotope geochemistry; Stratigraphic height; Temperature, technical; Temperature, technical, standard error; Uniform resource locator/link to reference; Xining_Basin_Caijia; Xining_Basin_Ledu; XRD; Δ47; Δ47, standard deviation; δ13C; δ18O; δ18O, soil water; δ18O, soil water, standard error
    Type: Dataset
    Format: text/tab-separated-values, 748 data points
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  • 7
    Publication Date: 2024-06-12
    Keywords: Albite; Albite, full width at half maximum, 3.2Å; Albite (Intensity, 3.2Å); Albite (Peak 3.2Å); Albite (Peak Area 3.2Å); Analcime; Analcime, full width at half maximum, 3.43Å; Analcime (Intensity, 3.43Å); Analcime (Peak 3.43Å); Analcime (Peak Area 3.43Å); Bulk organic geochemistry; Calcite; Calcite, full width at half maximum, 3.04Å; Calcite (Intensity, 3.04Å); Calcite (Peak 3.04Å); Calcite (Peak Area 3.04Å); China; Chlorite; Chlorite, full width at half maximum, 14Å; Chlorite, full width at half maximum, 3.53Å; Chlorite, full width at half maximum, 7.1Å; Chlorite (Intensity, 14Å); Chlorite (Intensity, 3.53Å); Chlorite (Intensity, 7.1Å); Chlorite (Peak 14Å); Chlorite (Peak 3.53Å); Chlorite (Peak 7.1Å); Chlorite (Peak Area 14Å); Chlorite (Peak Area 3.53Å); Chlorite (Peak Area 7.1Å); Clumped isotope thermometry; Dolomite, full width at half maximum, 2.91Å; Dolomite (Intensity, 2.91Å); Dolomite (Peak 2.91Å); Dolomite (Peak Area 2.91Å); Event label; Illite/muscovite; Illite-Muscovite, full width at half maximum, 10Å; Illite-Muscovite (Intensity, 10Å); Illite-Muscovite (Peak 10Å); Illite-Muscovite (Peak Area 10Å); Instrument; Kalifeldspar; Kalifeldspar, full width at half maximum, 3.25Å; Kalifeldspar (Intensity, 3.25Å); Kalifeldspar (Peak 3.25Å); Kalifeldspar (Peak Area 3.25Å); Latitude of event; Lithology/composition/facies; Longitude of event; Magnesium carbonate; Magnesium-Dolomite; Mixed layer illite/muscovite; Mixed layer illite/smectite, full width at half maximum, 10.4Å; Mixed layer illite/smectite (Intensity, 10.4Å); Mixed layer illite/smectite (Peak 10.4Å); Mixed layer illite/smectite (Peak Area 10.4Å); OUTCROP; Outcrop sample; palynology; pedogenic carbonate; Plant wax; Quartz; Quartz, full width at half maximum, 3.34Å; Quartz, full width at half maximum, 4.26Å; Quartz (Intensity, 3.34Å); Quartz (Intensity, 4.26Å); Quartz (Peak 3.34Å); Quartz (Peak 4.26Å); Quartz (Peak Area 3.34Å); Quartz (Peak Area 4.26Å); Reference/source; Relative abundance (bulk minerals); Sample ID; Section; stable isotope geochemistry; Stratigraphic height; Uniform resource locator/link to reference; Xining_Basin_Caijia; Xining_Basin_Ledu; X-ray diffraction (XRD); XRD
    Type: Dataset
    Format: text/tab-separated-values, 1950 data points
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  • 8
    Publication Date: 2024-06-12
    Keywords: According to Anderson et al. (2021); Bulk organic geochemistry; Clumped isotope thermometry; Instrument; Laboratory code/label; palynology; pedogenic carbonate; Plant wax; Run Date/Time; Run Number; Sample ID; stable isotope geochemistry; Standard deviation; Temperature, technical; XRD; Δ47; Δ48; Δ49; δ13C; δ18O; δ45; δ46; δ47; δ48; δ49
    Type: Dataset
    Format: text/tab-separated-values, 61571 data points
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