A PRELIMINARY STUDY ON THE PRECAMBRIAN PALEOSTRUC TURE IN THE ZHEXI-GANDONGBEI
Deng Kiarui Zheng Zhipin (department of geology)
Study after the analysis on the formation and tectonic of precambrian expounded the characteristics of the palaostructure in Zhexi-Gandongbei area. Dong, an orogen Was the most important tectonization in the area. Chiangnaia and Cothaysian successived folding inversion and formed old land. It set up the gather base of tectonic framework in this area. In lateproterozoic Era the sharp rift faulting occured and caused a whole set of complex or polychange volcanic-sedimentary sequences. There was paleostructure, which was anlacogen, in Caledonian affiliation of the area. It had formed very important upper sinian series-lower cambrian series uranium-rich layer. I presents theoretical base of tectonic to the formation of the important uranium minerogenetic zone and is of the important economic significance for going a further step to launch a rewnnaissance survey of mineral depoits.