印度西北部Marwar超群沉积构造属性及其对Rodinia超大陆中印度-扬子陆块关系的制约

印度和扬子陆块在Rodinia超大陆中的位置及相互关系是近年来的研究热点，但争议不断。对比在Rodinia聚合裂解过程中二者的岩浆-沉积-构造体系是否一致，是解决争论的关键因素。沉积盆地很好地保存了与源区有关的岩浆构造事件和造山运动等地质过程，从而为判断超大陆中陆块相邻与否提供重要的研究对象。近年来有关扬子陆块的研究深入丰富，而有关印度的研究则相对缺乏。印度西北部广泛出露的Marwar超群为研究该区沉积构造演化，以及进行印度-扬子对比提供了重要的研究素材。本项目拟以Marwar超群为研究对象，运用沉积学，锆石年代学和单矿物原位微量元素分析，结合全岩主微量元素、Nd同位素和沉积岩碎屑统计等方法，深入研究Marwar超群的沉积时限，源区特征和构造属性，探讨印度西北部新元古-早古生代的构造属性和演化。通过区域和全球同期沉积地层对比，为印度和扬子陆块在Rodinia超大陆中的相互关系提供重要约束。

The assembly and dispersal of supercontinent has been a hot topic in the past three decades. One of the most controversial issues is the possible linkage between Indian and the Yangtze Block in the configuration of Rodinia. Similar magmatic-sedimentary-tectonic systems are expected to occur in both continents if the proposed linkage is correct. Considering the formation and evolution of sedimentary basins are closely linked with several scientific issues, such as the nature of sedimentary sources and tectonic processes, comparison on coeval sedimentary basin from India and Yangtze is effective way to test the linkage. In recent years, Yangtze Block has been intensively studied, whereas the construction of the India in Rodinia supercontinent is poorly constrained. Therefore, well preserved sedimentary succession known as the Marwar Supergroup in the NW India provide excellent opportunity to study the crustal and tectonic evolution of the NW India and thus the comparison between India and Yangtze in term of sedimentary basin. In this project, we will carry out detailed studies on sedimentology, geochronology and geochemistry of accessory minerals, such as zircon, from sedimentary rocks, together with traditionally methods, like bull rock major and trace elements and modal point counting of clastics, in an order to understand the depositional time, nature of source rocks and tectonic setting of the Marwar Supergroup. These new results, in combination with the comparison among synchronous sedimentary strata in the Yangtze Block and other continents, will provide new insights into the crustal and tectonic evolution of the NW India and the role of India and Yangtze in the reconstruction of the Rodinia supercontinent.