柴达木古湖中中新世古高程定量重建---基于氧同位素古高程计和碳酸盐Clump (△47)古温度-古高程计

定量重建青藏高原新生代古高程对于深入理解高原隆升历史以及东亚季风形成演化过程具有重要意义。近二十年来，众多学者利用多种研究手段对青藏高原新生代隆升过程的定量重建开展了广泛的研究。然而绝大多数工作集中于青藏高原的中南部，在高原北部地区开展的工作甚少。作为青藏高原北部最大的陆相沉积盆地，柴达木盆地新生代河湖相地层序列连续清晰，为我们研究青藏高原北部地区新生代古环境演变，以及其与高原隆升和全球古气候演变之间的耦合历史提供了重要窗口。本项目拟选取有良好磁性年代学约束的柴达木盆地大红沟剖面中中新世湖相地层，以特征介形类壳体和裂腹鱼类咽齿化石为载体，基于氧同位素古高程计和碳酸盐Clump (△47)古温度-古高程计模型的运用，重建青藏高原北部柴达木古湖中中新世时期的古高程，从而为柴达木古湖晚新生代的演化历史和亚洲内陆干旱化的主导机制研究提供重要科学依据。

The paleoaltimetry reconstructions of Tibetan Plateau are crucial to interpret its surface uplift history and to understand the development of Asian monsoon system. Over the last two decades, using several valuable approaches, multitudinous quantitative paleo- altimetry reconstructions of the Tibetan Plateau have been carried out by many scholars. However, most of paleoaltimetry reconstructions were concentrated in the southern and central parts of the plateau, and such work is rarely carried out in the northern plateau. As the largest sedimentary basin on the northern Tibetan plateau, the Qaidam Basin preserves an exceptionally Cenozoic fluvio-lacustrine sedimentary succession and can provides unique insight into palaeoenvironment change and its relationship with global change and uplift of the Tibetan Plateau. In this study, we focus on the middle Miocene ostracods and pharyngeal teeth of schizothoracine from the well-dated lacustrine stratum of Dahonggou section in the Qaidam basin. In this study, stable oxygen isotopes and Clumped isotope (TΔ47) analyses will be applied to reconstruct the paleoelevation of the paleo-Qaidam lake during the middle Miocene, to provide important scientific basis for the late Cenozoic evolution history of paleo-Qaidam lake and main driving forces of aridification in Central Asia.