Discussion of the Diversified Characteristics of Structural Layer and Ore-bearing Strata in Great Xing'an Ranges
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摘要: 大兴安岭造山带前人认为其构造层主要为古生代，赋矿地层为上古生界二叠系。笔者通过系统分析总结近几年地质填图及矿产勘查资料，结合重磁场特征、地震大地电磁测深剖面进行综合研究，认为大兴安岭造山带构造层以古生界为主，但前寒武变质岩系亦是其重要的组成部分，并对于构造层的多元化形成机制进行了深入的探讨；赋矿地层不仅仅是二叠系，亦具有多元化特征，元古界变质岩系、古生界褶皱系、中生界侏罗系和白垩系，还有元古代-古生代的各类岩体和火山岩均是重要的赋矿地质体，这一认识为大兴安岭地质找矿思路的多元化、多模式提供了充分的理论依据和实践依据。Abstract: The structural layer of Greater Khingan Mountains was known as Paleozoic strata, while its ore-bearing strata were formed in Permian. In this paper, the data of geological mapping and mineral prospecting in recent years has been systematically summarized and studied, combining with gravity and magnetic field characteristics, seismic and magnetotelluric sounding data in this area. The results show that Paleozoic strata serve as the major structural layers in Greater Khingan Mountains, with an important part of Precambrian metamorphic rock series. In addition, the diversified formation mechanism of structural layerhas been discussed. The ore-bearing strata of Greater Khingan Mountains were not only formed in Permian, they were also sourced from Proterozic metamorphic rock series, Paleozoic fold series,Jurassic and Cretaceous strata, as well as various kinds of rock masses and volcanic rocks in Proterozic-Paleozoic, with diversified characteristics.This conclusion provides sufficient theoretical and practical basis to the diversified and multi-mode prospecting ideas in Greater Khingan Mountains.
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