Based on a multi-proxy investigation into the deep core of the Cuoe Lake in the middle of Tibetan Plateau, a 2.8 Ma paleoclimatic and paleoenvironmental evolution is recon- structed. The result of magnetic stratum ind...Based on a multi-proxy investigation into the deep core of the Cuoe Lake in the middle of Tibetan Plateau, a 2.8 Ma paleoclimatic and paleoenvironmental evolution is recon- structed. The result of magnetic stratum indicates that the lake basin was formed at about 2.8 MaBP, while the multi-proxy analyses of lithology, grain size, magnetic susceptibility and geo- chemical elements reveal that there have been three major environmental evolution stages and at least two intensive uplifts of the Tibetan Plateau in the lake basin area, i.e. during 2.8—2.5 MaBP, the lake basin came into being as a result of the disaggregation of the planation surface and rapid rising of the Tibetan Plateau. During 2.5—0.8 MaBP, with gradual uplift of the Tibetan Plateau, the environment of this area was more effectively controlled by the climatic cycle of the alternative glacial-interglacial stages. After 0.8 MaBP, the middle part of the Plateau accelerated its uplift and entered cryoshere.展开更多
Through the analyses on sediment lithology, ^(210)Pb and ^(137)Cs dating, carbonate content, Sr/Ca and Mg/Ca of Ostrocod, and carbon and oxygen stable isotope of carbonate of gravity core from Cuoe Lake in the Naqu ar...Through the analyses on sediment lithology, ^(210)Pb and ^(137)Cs dating, carbonate content, Sr/Ca and Mg/Ca of Ostrocod, and carbon and oxygen stable isotope of carbonate of gravity core from Cuoe Lake in the Naqu area, Tibetan Plateau, the paleolimnology was studied to investigate the environmental variation in the central Tibetan Plateau in the last 200 years. It is inferred that the environmental variation has undergone two stages. The climate was arid in the early 100 years, while it became warmer and more humid in the later 100 years, with a period of 20 years for humidity change.展开更多
文摘Based on a multi-proxy investigation into the deep core of the Cuoe Lake in the middle of Tibetan Plateau, a 2.8 Ma paleoclimatic and paleoenvironmental evolution is recon- structed. The result of magnetic stratum indicates that the lake basin was formed at about 2.8 MaBP, while the multi-proxy analyses of lithology, grain size, magnetic susceptibility and geo- chemical elements reveal that there have been three major environmental evolution stages and at least two intensive uplifts of the Tibetan Plateau in the lake basin area, i.e. during 2.8—2.5 MaBP, the lake basin came into being as a result of the disaggregation of the planation surface and rapid rising of the Tibetan Plateau. During 2.5—0.8 MaBP, with gradual uplift of the Tibetan Plateau, the environment of this area was more effectively controlled by the climatic cycle of the alternative glacial-interglacial stages. After 0.8 MaBP, the middle part of the Plateau accelerated its uplift and entered cryoshere.
文摘Through the analyses on sediment lithology, ^(210)Pb and ^(137)Cs dating, carbonate content, Sr/Ca and Mg/Ca of Ostrocod, and carbon and oxygen stable isotope of carbonate of gravity core from Cuoe Lake in the Naqu area, Tibetan Plateau, the paleolimnology was studied to investigate the environmental variation in the central Tibetan Plateau in the last 200 years. It is inferred that the environmental variation has undergone two stages. The climate was arid in the early 100 years, while it became warmer and more humid in the later 100 years, with a period of 20 years for humidity change.
