浅议华北地块岩石圈减薄与成矿
首发时间:2009-10-29
摘要:岩石圈减薄对大规模成矿的贡献是通过消耗岩石圈来实现的,岩石圈减薄导致岩石圈中的成矿元素被带出至地壳中成矿是镍、金、钼、钨大规模成矿的基本机制;华北地块岩石圈减薄对镍、金、钼、钨大规模成矿的贡献时限始自构造转折开始时而终至岩浆富集地幔源向亏损地幔源转化期,即可能在163Ma-136Ma—117Ma-80Ma之间; 而在岩石圈不均一减薄过程中,伴随不同程度软流圈隆起而出现的大规模岩浆作用和深部流体作用对岩石圈中不同成矿元素有不同的活化、转移和富集作用,即岩石圈在时间和空间上的不均一减薄可能是地壳中不同类型的镍、金、钼、钨等矿床和矿集区时空分布差异性的重要原因。
关键词: 华北地块 岩石圈减薄 岩石圈减薄不均一性 镍矿床; 金矿床 钼矿床 钨矿床
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The Relationship of the Lithospheric Thinning to the Mineralization in the North China Craton
Abstract:The relationship of the lithospheric thinning to the mineralization in North China Craton and related guide scientific problems are put and discussed in this paper. Nickel, gold, molybdenum and tungsten in different spheres of Earth may be expelled by the lithospheric thinning and deposited in Earth crust; The time limit of the contribution to large-scale Ni, Au, W, and Mo mineralizations of the lithospheric thinning is from the structure turn period to the transform period from enriched mantle source to depleted mantle source of magma, namely, from 163Ma-136Ma to 117Ma-80Ma; and Inhomogeneous spatially and temporally lithospheric thinning may have special significance for the controlling of the inhomogeneous spatially and temporally distribution of nickel, gold, molybdenum and tungsten deposits-concentrated districts in North China .
Keywords: North China Craton lithospheric thinning inhomogeneity of lithospheric thinning Nickel deposits gold deposits molybdenum deposits tungsten deposits
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No.3625449670812567****
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