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

合作研究：印度新元古代Vindhychal盆地的综合分析最近的中元古代(1300-1000 Ma)和新元古代(1000-543 Ma)代表了以地球系统过程深刻变化为标志的地球历史时期。这些变化包括：随着游离氧的积累，大气和海洋化学发生了巨大变化；随着低纬冰川作用的反复发生，从稳定、静止的气候转变为多变的气候条件；以及双边多细胞生物的进化和生物矿化作用的创新。目前，由于缺乏能够在全球范围内综合数据的明确和校准的地层学参考框架，我们对这一重要间隔的理解受到阻碍。该项目试图通过对印度半岛文迪扬查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-新元古代至早寒武世的大部分沉积记录，但在印度以外的地区相对较少受到关注。我们的分析将把火山灰层和其他火成岩单元的U-Pb年代学放在层序地层学的背景下，作为未来生物地层学、磁性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.