亚洲东部古板块结合带上的火山——侵入作用及有关矿产

亚洲东南地区在西伯利亚板块与塔里木—中朝板块之间有天山(北天山)-兴安地槽褶皱带;在塔里木-中朝板块与杨子板块之间有秦岭-大别褶皱带(东部);扬子板块与华南板块之间有赣(东北)-浙(西)-皖(南)对冲带。东部沿海地区北北东向滨太平洋板块则横切以上近东西向和北东向诸板块,展现出太平洋西海岸最新板块的格局。各板块对接带上发育开阔和长期发展的火山-侵入岩带。不同类型的火山-侵入岩有不同的矿产:金(铜铅锌)多与中-基性火山-侵入岩有关;铜铅锌、锡(钨);铁多与中-酸性火山-侵入岩有关;铜镍多与基性、超基性侵入岩有关。

VOLANISM-INRTUSION AND RELATED ORE-DEPOSITS ON SUTURE ZONES OF PALAEO-PLATES IN EASE ASIA

In east China,there exist Tianshan (northern Tianshan)-Xingan geosynclinal fold belt between Siberian plate and Tarim-Sino-Korean plate, Qinling-Dabei fold belt(east pan) beween Tarim-Sino-Korean plate, and Jiangxi (northeast Jiangxi)-Zhejiang(west Zhejing)-Anhui (south Anhui) collision belt beween Yangtze plate and south China plate. The NNE trending Pacific plate transected aforsaid EW and NE trending plates in east China coast, showing the typical tectonic pattern of the west coast Pacific ocean. Widely distributed and multiactivated volcanic-intrusive rock belt occured along the collision zones of different plates. Different ore-deposites are associated with different volcanic-intrusive rocks: the gold deposits(Cu-Pb-Zn) are usually related to middle-basic volcanic-intrusive rocks; Cu-Pb-Zn, Sn(W), and Fe ore-deposits are mostly associated with middle-acidic volcanic-intrusive rocks; Cu-Ni mineral deposits are generally related to basic, ultrabasic rocks.