大别山(北麓)斑岩型钼矿床成矿系列及成矿规律

Metallogenic Systems and Regularity of Porphyry-Type Molybdenum Deposit in Dabieshan Mountain

大别山造山带,是秦岭褶皱带南东的组成部分,它与龟(山)—梅(山)断裂带、北东向断裂共同控制着豫南岩浆岩的分布。燕山期的中酸性岩基是成矿小岩体的母岩,而成矿小岩体又是斑岩型钼矿床的成矿母岩。燕山期中国东部在陆内俯冲作用下,岩石圈在挤压、伸展后表现减薄,引起软流圈抬升和地幔上涌,形成深源浅成型花岗岩。矿床类型与岩浆成分有关,表现出明显的成矿专属性。相同的构造—岩浆成矿作用,因空间位置的不同,形成了大别山的斑岩型钼矿床成矿系列。根据成矿系列,研究其斑岩型钼矿成矿规律,对大别山的钼、铜、铅、锌等多金属找矿有重大的指导意义。

Dabieshan Mountain orogen consisted of the south-east Qinling fold Zone, controls the magmatic rock together in southern Henan Province with Guishan-Meishan fault zone and north-east fault. Neutro-acid batholith of Yanshan stage is the parent lock of small metallogenetic rock which is the metallogenetic parent rock of porphy- ry-type molybdenum deposit. During the continent, after pushing and stretching lithosphere becomes thinner, which makes the asthenosphere and mantle rise and finally the granite with deep origin but superficial layer comes into being. The ore type is related to the composition of magma, and clearly indicates the metallogenetic property. The metallogenetic series of porphyry-type molybdenum deposit is formed with the same constitution and magma metallogentic effect, but different space position. It will be significance for the exploration of molybdenum, copper, lead and zinc in Dabieshan Mountain to research on the metallogenetic rules of porphyry-type molybdenum deposit according to the metallogenic systems.