Collaborative Research: High-resolution, multi-proxy Miocene-Pleistocene climate and environmental record from the high-elevation Zhada basin, SW Tibetan Plateau

合作研究：青藏高原西南高海拔查达盆地中新世-更新世气候与环境的高分辨率多指标记录/ timothy Shanahan， EAR-1226984 /德克萨斯大学austin /王晓明，EAR-1227212 /洛杉矶县自然历史博物馆/摘要拟开展青藏高原南部地区环境变化的原因与影响研究。青藏高原在新生代构造、动物、环境和古气候演化模式中占有重要地位。然而，尽管在青藏高原边缘地区对这些主题进行了广泛的研究，但很少有研究关注高原本身的环境变化记录，而且现有的高原数据复杂且存在矛盾。西藏西南扎达盆地高海拔古扎达湖湖相沉积中，蕴藏着丰富的脊椎动物、无脊椎动物和植物化石，保存了近9 Ma以来环境变化和脊椎动物进化的宝贵记录。本研究旨在结合碳酸盐稳定同位素（如d18O、d13C、delta47）、分子地球化学和稳定同位素（如MBT/CBT指数、d13Cwax）的方法，从扎达盆地沉积物中重建高原过去气候和环境变化的历史，并将这些变化与化石记录的变化联系起来。总之，这些数据将为该地区在这一关键时期提供最完整的环境和动物变化记录。

COLLABORATIVE RESEARCH: High-resolution, multi-proxy Miocene-Pleistocene climate and environmental record from the high-elevation Zhada basin, SW Tibetan PlateauByTimothy Shanahan, EAR-1226984, Univ. Texas AustinXiaoming Wang, EAR-1227212, Los Angeles County Museum of Natural HistoryABSTRACTThe proposed work will investigate the causes and effects of environmental change in the southern Tibetan Plateau. The Tibetan Plateau figures prominently in models of Cenozoic tectonic, faunal, environmental, and paleoclimate evolution. However, despite extensive research into these topics on the margins of the Tibetan Plateau, little research has focused on the record of environmental change on the plateau itself, and existing data from the plateau is complex and appears contradictory. The extensive lacustrine deposits of high elevation paleolake Zhada in the Zhada Basin of southwestern Tibet contain abundant vertebrate, invertebrate, and plant fossils and preserves a valuable record of environmental change and vertebrate evolution spanning the last 9 Ma. The proposed work seeks to use a combination of carbonate stable isotopes (e.g., d18O, d13C, delta47), molecular geochemical and stable isotopic (e.g., MBT/CBT index, d13Cwax) approaches to reconstruct the history of past climate and environmental changes on the plateau from the Zhada Basin sediments and to link these to the changes in the fossil record. Together, these data will provide the most complete record of environmental and faunal change over this crucial period of time available for this region.