The Os Isotopic Record of Himalayan Paleorivers: A New Tool for Understanding Regional Himalayan Tectonic History and Influence on Ocean Chemistry

9903278约翰·T·切斯利事件导致第三系海水的187Os/188Os和87Sr/86Sr值逐渐增加，但人们对此知之甚少。与地壳内其他同位素系统相比，放射性成因Os的快速增长提供了一种新的工具，可能有助于进一步约束喜马拉雅造山带的大规模构造历史。我们将讨论过去50年来古印度河、恒河和雅鲁藏布江的Os、Sr和同位素组成的变化。我们的目标是确定古土壤的Os同位素组成是否与海洋化学的变化有关，是否与尼泊尔西部和中部主要构造地层带前陆盆地沉积的来源和时间有关。

9903278John T. Chesley Events in the geologic record responsible for the gradual increase in the 187Os/188Os and 87Sr/86Sr values for seawater through the Tertiary are poorly understood. The rapid growth of radiogenic Os, compared to other isotopic systems, within the crust, offers a new tool, which may help further constrain the large-scale tectonic history of the Himalayan orogen. We will address variations in the Os and Sr and isotopic composition of paleo- Indus, Ganges and Brahmaputra rivers over the last 50 myrs. Our goal is to determine if the Os isotopic composition of paleosols can be related to changes in ocean chemistry and related to the source and timing of foreland basin sediments of major tectonostratigraphic zones of the western and central Nepal.