Proxies deduced from borehole geophysics help to reconstruct the stratigraphic architecture and climatic history of the Tibetan Plateau

我们计划收集钻孔测井数据，作为ICDP项目“西藏纳姆措钻探项目（NamCore）：来自第三极的100万年沉积记录”的一部分，并与其他学科的参与工作组一起解释。在该项目的框架内，将在三个钻孔地点收集钻孔地球物理数据。在第一步中，这些数据将针对个别地点进行汇编，然后来自所有地点，并测试其相似性和差异性。一旦获得岩心数据，井眼和岩心数据就会结合起来。我们将应用时间序列分析和旋回地层学方法对这些合并的多元数据集进行分析。沉积物性质的变化将与过去太阳辐照度的变化有关，并由此推导出时间-深度尺度。在下一步中，将应用多元统计来了解数据集的复杂性，并通过聚类分析来了解相交岩性。最后，我们将综合岩性和沉积时代的信息，提出干旱/降水关系的观点，并在全球气候演变的背景下进行解释。

We plan to collect borehole logging data as part of the ICDP project "The Nam Co Drilling Project, Tibet (NamCore): A one million year sedimentary record from the third pole" and to interpret it together with the participating working groups from other disciplines. Within the framework of this project, borehole geophysical data will be collected at three borehole sites. In a first step, these data will be compiled for the individual sites and then from all locations and tested for similarities and differences. As soon as core data become available, borehole and core data will be combined. We will apply time series analysis and cyclostratigraphy methods to these merged multivariate data sets. Changing sediment properties will be related to changes in past solar irradiance, and from this, a time-depth scale will be derived. In the next step, multivariate statistics will be applied to understand the complexity of the datasets and to get an idea of the intersected lithology by means of cluster analysis. Finally, we will synthesize the information on lithology and depositional age, develop ideas on the drought/precipitation relationship and interpret them in the context of global climate evolution.