“岩矿星”学术沙龙活动第十六期

报告题目：Neoproterozoic geodynamics of NW Indian Block: the Rodinia linkage

报告人：Manoj Pandit 教授

报告时间：2016年03月25日（周五）下午14：30

报告地点：主楼412会议室

个人简介：

Professor of Geology and Principal of Maharaja College (University Constituent College).

Professor Manoj Pandit focuses on the research of Tectonics and Geochemistry, Rock Magnetism and Antarctic Geology. He has been working on the Precambrian geology of NW India and its

relationship to supercontinental cycles and has published 110 articles in international peer-reivewed journals. Professor Manoj Pandit is the coeditor of Journal of Asian Earth Sciences, memeber of the 26th and 34th Indian Scientific Expeditions to Antarctica (2006-2007 & 2014-15) and also

led the Indian team during scientific exchange visits to Chinese, Russian and Australian research

stations in E Antarctica.

内容简介：

The NW Indian block comprises of an eastern, Aravalli-Banded Gneiss Complex (Arcahen-Proterozoic) craton in the east and a younger Neoproterozoic-Phanerozoic (Marwar) terrane in the west, both sutured along the western flank of NE-SW trending Aravalli-Delhi Fold Belt. The region documents tectono-magmatic events between 1 and 0.75 Ga that define the time bracket between amalgamation and break-up of the Neoproterozoic supercontinent Rodinia. The 967 Ma, calc-alkaline, Sendra-Ambaj granites represent the early Neoproterozoic magmatic activity and occur as a series of linear exposures. The next episode is emplacement of typically S-type granites (870-820 Ma) related to the crustal convergence during Delhi Orogeny. The terminal magmatism is marked by initial outpouring of bimodal felsic (mainly) and mafic lava flows, followed by granite and felsic and mafic dyke emplacement, covering an area of more than50,000 km2. Known as the Malani Igneous Suite, it is regarded as the third largest felsic igneous province in the world. The rocks can be chemically subdivided into peraluminous (volumetrically abundant) and peralkaline types that also define temporal preferences. The magmatic event has been dated between 770 and 750 Ma and the rocks have also provided robust Neoproterozoic paleomagnetic poles that allow a much northerly paleoposition for the NW Indian block then envisaged in conventional paleogeographic reconstructions.