华南东部中生代岩浆作用的动力学背景及其与铀成矿关系

中国东南大陆在中生代岩浆作用十分强烈 ,形成了大批稀有和有色金属矿床。发生在早中生代 (T)的印支运动和晚中生代 (J K)的燕山运动是发动该区岩浆作用和成矿作用的动力条件。印支运动在区域挤压框架下导致华南大陆发生板内伸展作用 ,形成印支期花岗岩。燕山运动是相对于印支运动的后造山地质事件 ,以岩石圈发生强烈裂解为特征 ,诱发了大规模岩浆活动 ,并形成了丰富的矿产资源。受燕山期构造 岩浆热事件叠加的印支期花岗岩与铀成矿关系密切 ,可能是铀源体。因此 ,在华南的铀矿找矿工作应加强对印支期花岗岩分布格局和成矿因素的研究

Geodynamic setting of Mesozoic magmatism and its relationgship to uranium metallogenesis in southeastern China

In the southeastern China,magmatism was developed quite intensely in Mesozoic forming a large quantity of rare and nonferrous metal deposits.The Indosinian orogenic movement (Early Mesozoic) and the Yanshanian movement(Late Mesozoic) provided the dynamic force for magmatism and metallogenesis in this region.The intra plate extension was induced by the Indosinian orogenic movement in South China continent under a regionally compressional framework to form Indosinian granites.The Yanshanian movement was a post orogenic geologic event in relation to the Indosinian orogeny,and characterized by intense lithosphere breaking up,resulting in large scale magmatic activities and a great amount of mineral resources was formed.The Indosinian granites overprinted by the Yanshanian tectono magma event were closely related to uranium metallogenesis and were likely a kind of uranium source rock.Therefore,research on the distribution pattern of Indosinian granitoids and factors favorable to uranium ore formation should be enhanced during prospecting in southern China.