华南叠加-重熔型花岗岩的成生机制

THE FORMATION MECHANISM OF MULTIPLE-REMELTING TYPE GRANITE IN SOUTHERN CHINA

南岭成矿带是太平洋及印度洋板块对中国大陆板块联合作用的结果。囊括大量稀有-有色金属矿床的中心弧形构造-岩浆岩系正是这个“钳式”应力场作用的集中体现,“深部叠加-重熔”——以板块持续运动和相对高速率运动产生并贮集能量为前提,以俯冲板块不断带入新的挥发物质为条件,随着动力热和挥发组分的不断回流—汇集—贮集而使仰冲板块深部预热的原地或途中固化-半固化的先期熔融的岩浆岩发生了二次甚至多次的熔融作用。

The Nanling metallogenic belt is the result of the combination of the Pacific plate and the Indian oceanic plate with the continental plate of China. Tectonic-igneous rock system of central arc type, including a large amount of rare element-polymetallic deposits, have results from such a pincerlike stress field. The scheme of deep-seated multiple-remelting is described as follows. Sustained movement of plates produced and concentrated a large amount of energy, and the descending of oceanic plate continuously provided new volatile components, thus the heat energy and volatiles were concentrated, and finally in the deep part of the earth's crust the remelting of previous melted igneous rocks took place.