COLLABORATIVE RESEARCH: Integrated Analysis of the Neoproterozoic Vindhychal Basin, India

摘要中元古代晚期（1300 ~ 1000 Ma）和新元古代晚期（1000 ~ 543 Ma）代表了地球系统过程发生深刻变化的地球历史时期。这些变化包括大气和海洋化学随着游离氧的积累而发生的巨大变化；随着低纬度冰川的反复发生，从稳定的静态气候向变化的气候条件转变；以及双边多细胞生物的进化和生物矿化的创新。我们对这一重要层段的理解目前受到缺乏一个明确定义和校准的地层参考框架的阻碍，在这个参考框架中，数据可以在全球范围内进行整合。本项目力求通过对印度半岛温迪扬恰尔盆地部分地区进行试点研究来解决这一问题。该盆地似乎保存了中新元古代至早寒武纪的大部分沉积记录，但在印度以外的地区受到的关注相对较少。我们的分析将把灰层和其他火成岩单元的U-Pb地质年代学置于层序地层学背景中，这将作为未来生物地层学、磁地层学和化学地层学研究的时间和物理框架。

AbstractCollaborative Research: Integrated Analysis of the Neoproterozoic Vindhychal Basin, IndiaThe latest Mesoproterozoic (1300-1000 Ma) and Neoproterozoic (1000-543 Ma) eras represent intervals of Earth history marked by profound changes in Earth system processes. These changes include large shifts in atmospheric and ocean chemistry with the build-up of free oxygen; the transition from equable, static climate to variable climatic conditions with the repeated occurrence of low-latitude glaciation; and theevolution of bilateral, multicellular organisms and the innovation of biomineralization. Our understanding of this important interval is currently hampered by the lack of a well- defined and calibrated stratigraphic reference framework, in which data can be integrated at a global scale. This project seeks to tackle this issue by means of a pilot study of portions of the Vindhyanchal basin of peninsular India. This basin appears to preserve a sedimentary record for much of the Meso-Neoproterozoic to Early Cambrian interval, but has received comparatively little attention outside India. Our analysis will place U-Pb geochronology of ash beds and other igneous units in a sequence stratigraphic context that will serve as the temporal and physical framework for future biostratigraphic, magnetostratigraphic, and chemostratigraphic studies.