浙闽裂谷带的成矿意义

浙闽裂谷带为金银铅锌铜钼金属矿床及萤石、高岭土等非金属矿床的重要成矿域，其代表性矿床有治岭头金银矿床、梅仙式块状硫化物多金属矿床、银坑斑岩型钼矿床、湖山萤石矿田、武义萤石矿田等。裂谷带活动具两个旋回，第一旋回与超大陆解体相当，始于新元古代，闭合于加里东期，代表性地层标志为中元古代地层。第二旋回始于燕山早期，止于燕山晚期，代表性地层标志为下侏罗统枫坪组地层及白垩纪断陷盆地沉积地层。第一旋回相对应区域变质、混合岩化、韧性剪切活动及岩浆岩侵位等地质作用。第二旋回相对应大规模火山喷发、岩浆侵位、断陷盆地等地质作用。第一旋回裂谷环境中，形成治岭头式金银矿和梅仙式铅锌多金属矿床的初胚或金属矿床的初始矿体；在第二旋回后期大规模火山热液的成矿作用中，使前者叠加富集，形成了巨大资源量的工业矿体，而岩体侵位形成了一系列斑岩铜矿和浙闽地区极富特色非金属矿、萤石矿成矿带。

Mineralization significance of Zhejiang-Fujian rift-valley belt

The Zhejiang-Fujian rift-valley belt is an metallic mineral resources and fluorite, kaolin important belt of Au, Ag, Cu, Pb, Zn, Mo and other nonmetallic mineral resources. The typical mineral deposits include Zhilintou Au-Ag deposit, Meixian type massive sul- fide polymetallic deposit, Yingkeng porphyry Mo deposit, Hushang and Wuyi fluorite orefields and others. The activity of the rift-valley belt had two cycles, the first one, being in correspondence with disintegrating of Rodinia supercontinent, started from Later Proterozoic and closed in Caledonian period, its representative stratigraphic sign is occurrence of Middle Proterozoic strata. The second one started from Early Yanshanian period and ended in Later Yanshanian period, the typical stratigraphic sign is occurrence of Lower Jurassic Fengping Formation and sedimentary strata of Cretaceous faulted basins. The first cycle is correspondent with geological processes including regional metamorphism, migmatization, ductile shearing and magma intrusion. The second cycle is correspondent with geological processes including large-scale volcanic exhalation, magma intrusion and formation of faulted basins. During the first cycle in the rift-valley environment, the preliminary mineralization enrichments of Zhilintou type Au-Ag deposit and Meixian type sulfide Pb- Zn polymetallic deposit were occurred; while during the late stage of the second cycle, the large-scale volcanic hydrothermal mineralizations caused further mineralization enrichments which overlapped on the former deposits, and magma intrusion caused to form a series of porphyry Cu-Mo deposits as well as nonmetallic, fluorite mineralization belts with distinctive features in Zhejiang-Fujian region.