UHT metamorphism and fluids of the Gondwana collision zone

本研究对南印度、南极洲和南非及相关地区经历了1000度以上极端地壳变质的高级变质岩进行了详细的岩石学和流体包裹体研究。在详细的矿物学和结构观察的基础上，我们建立了个别区域的变质压力和温度路径，并成功地讨论了与冈瓦那等超大陆组装有关的高级地体的成因。我们进一步对岩石进行了流体包裹体研究，发现了矿物生长过程中捕获的富含CO2的流体包裹体。我们对这类富CO2包裹体的进一步研究表明，CO2来自地幔，流体可能对稳定UHT岩石中的干矿物组合起到了重要作用。

This study carried out detailed petrological and fluid inclusions studies of high-grade metamorphic rocks from South India, Antarctica, and South Africa as well as related regions, that underwent extreme crustal metamorphism at more than 1000 degree. Based on detailed mineralogical and textural observations, we could constructed metamorphic pressure and temperature paths of individual regions, and successfully discussed the origin of the high-grade terranes related to the assembly of supercontinents such as Gondwana. We further performed fluid inclusion study of the rocks and identified CO2-rich fluid inclusions trapped during the growth of minerals. Our further studies on such CO2-rich inclusions indicate that CO2 was derived from mantle and the fluid probably played an important role on stabilizing the dry mineral assemblages in the UHT rocks.