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Opitz, Stephan; Wünnemann, Bernd; Aichner, Bernhard; Dietze, Elisabeth; Hartmann, Kai; Herzschuh, Ulrike; IJmker, Janneke; Lehmkuhl, Frank; Li, Shijie; Mischke, Steffen; Plotzki, Anna; Stauch, Georg; Diekmann, Bernhard (2012): Mineralogical and geochemical data from five lake sediment cores of Lake Donggi Cona. PANGAEA, https://doi.org/10.1594/PANGAEA.787780, Supplement to: Opitz, S et al. (2012): Late Glacial and Holocene development of Lake Donggi Cona, north-eastern Tibetan Plateau, inferred from sedimentological analysis. Palaeogeography, Palaeoclimatology, Palaeoecology, 337-338, 159-176, https://doi.org/10.1016/j.palaeo.2012.04.013

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Abstract:
Sediments of Lake Donggi Cona on the northeastern Tibetan Plateau were studied to infer changes in the lacustrine depositional environment, related to climatic and non-climatic changes during the last 19 kyr. The lake today fills a 30 X 8 km big and 95 m deep tectonic basin, associated with the Kunlun Fault. The study was conducted on a sediment-core transect through the lake basin, in order to gain a complete picture of spatiotemporal environmental change. The recovered sediments are partly finely laminated and are composed of calcareous muds with variable amounts of carbonate micrite, organic matter, detrital silt and clay. On the basis of sedimentological, geochemical, and mineralogical data up to five lithological units (LU) can be distinguished that document distinct stages in the development of the lake system.
The onset of the lowermost LU with lacustrine muds above basal sands indicates that lake level was at least 39 m below the present level and started to rise after 19 ka, possibly in response to regional deglaciation. At this time, the lacustrine environment was characterized by detrital sediment influx and the deposition of siliciclastic sediment. In two sediment cores, upward grain-size coarsening documents a lake-level fall after 13 cal ka BP, possibly associated with the late-glacial Younger Dryas stadial. From 11.5 to 4.3 cal ka BP, grainsize fining in sediment cores from the profundal coring sites and the onset of lacustrine deposition at a litoral core site (2m water depth) in a recent marginal bay of Donggi Cona document lake-level rise during the early tomid-Holocene to at least modern level. In addition, high biological productivity and pronounced precipitation of carbonate micrites are consistent with warm and moist climate conditions related to an enhanced influence of summer monsoon. At 4.3 cal ka BP the lake system shifted from an aragonite- to a calcite-dominated system, indicating a change towards a fully open hydrological lake system. The younger clay-rich sediments are moreover non-laminated and lack any diagenetic sulphides, pointing to fully ventilated conditions, and the prevailing absence of lake stratification. This turning point in lake history could imply either a threshold response to insolation-forced climate cooling or a response to a non-climatic trigger, such as an erosional event or a tectonic pulse that induced a strong earthquake, which is difficult to decide from our data base.
Coverage:
Median Latitude: 35.291824 * Median Longitude: 98.521979 * South-bound Latitude: 35.253910 * West-bound Longitude: 98.436500 * North-bound Latitude: 35.345000 * East-bound Longitude: 98.602740
Date/Time Start: 2006-08-28T00:00:00 * Date/Time End: 2008-03-12T00:00:00
Size:
29 datasets

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Datasets listed in this publication series

  1. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): (Fig. 2) Profiles of temperature and oxygen in Lake Donggi Cona. https://doi.org/10.1594/PANGAEA.787836
  2. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): (Table 2) Radiometric data of sediment core PG1784, Lake Donggi Cona. https://doi.org/10.1594/PANGAEA.787776
  3. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): (Table 2) Radiometric data of sediment core PG1790, Lake Donggi Cona. https://doi.org/10.1594/PANGAEA.787777
  4. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): (Table 2) Radiometric data of sediment core PG1900, Lake Donggi Cona. https://doi.org/10.1594/PANGAEA.787778
  5. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): (Table 2) Radiometric data of sediment core PG1901, Lake Donggi Cona. https://doi.org/10.1594/PANGAEA.787779
  6. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Bulk components of sediment core PG1784. https://doi.org/10.1594/PANGAEA.787764
  7. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Bulk components of sediment core PG1790. https://doi.org/10.1594/PANGAEA.787765
  8. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Bulk components of sediment core PG1900. https://doi.org/10.1594/PANGAEA.787766
  9. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Bulk components of sediment core PG1901. https://doi.org/10.1594/PANGAEA.787767
  10. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Bulk components of sediment core PG1904. https://doi.org/10.1594/PANGAEA.787768
  11. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Calcium intensity of sediment core PG1784. https://doi.org/10.1594/PANGAEA.787769
  12. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Mineral composition of sediment core PG1784. https://doi.org/10.1594/PANGAEA.787759
  13. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Mineral composition of sediment core PG1790. https://doi.org/10.1594/PANGAEA.787760
  14. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Mineral composition of sediment core PG1900. https://doi.org/10.1594/PANGAEA.787761
  15. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Mineral composition of sediment core PG1901. https://doi.org/10.1594/PANGAEA.787762
  16. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Mineral composition of sediment core PG1904. https://doi.org/10.1594/PANGAEA.787763
  17. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Sand content of sediment core PG1784. https://doi.org/10.1594/PANGAEA.787749
  18. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Sand content of sediment core PG1790. https://doi.org/10.1594/PANGAEA.787750
  19. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Sand content of sediment core PG1900. https://doi.org/10.1594/PANGAEA.787751
  20. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Sand content of sediment core PG1901. https://doi.org/10.1594/PANGAEA.787752
  21. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Sand content of sediment core PG1904. https://doi.org/10.1594/PANGAEA.787753
  22. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Sedimentology of core PG1784. https://doi.org/10.1594/PANGAEA.787754
  23. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Sedimentology of core PG1790. https://doi.org/10.1594/PANGAEA.787755
  24. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Sedimentology of core PG1900. https://doi.org/10.1594/PANGAEA.787756
  25. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Sedimentology of core PG1901. https://doi.org/10.1594/PANGAEA.787757
  26. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Sedimentology of core PG1904. https://doi.org/10.1594/PANGAEA.787758
  27. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Sr/Ca ratios and Calcium intensity of sediment core PG1900. https://doi.org/10.1594/PANGAEA.787770
  28. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Sr/Ca ratios and Calcium intensity of sediment core PG1901. https://doi.org/10.1594/PANGAEA.787771
  29. Opitz, S; Wünnemann, B; Aichner, B et al. (2012): Sr/Ca ratios and Calcium intensity of sediment core PG1904. https://doi.org/10.1594/PANGAEA.787772