在华北地台中-新元古界中寻找金、银矿床的思路与前景

华北地台燕山地区新发现一批金、银矿床，它们主要赋存在变质核杂岩体主拆离断裂带上盘的中一新元古界中。文中初步总结了这些矿床的特征，阐述了大陆伸展构造体系在盖层地层中的表现型式以及类似卡林型金矿成矿作用的主要特征。在分析伸展构造与金、银矿成生和定位联系的基础上，指出豫陕小秦岭南部的金芦台四、燕山东段、燕山中西段及太行山北段的中一新元古界是寻找金、银矿床的新的战略重点区。同时进一步指出华北地台包括中一新元古界在内的沉积盖层是寻找与伸展构造体系控制的金、银矿床的有前景的地区。

THINKS AND PROSPECTS FOR SEARCH GOLD AND SILVER DEPOSITS IN MESO-NEOPROTEROZOIC SYSTEMS IN THE NORTH CHINA PLATFORM

A group of gold-silver deposits are newly discovered in Yanshan areas in the NorthChina platform, where the gold and silver deposits mainly hosted in hangingwall of a greatdecollement zone in metamorphic Core complex body of Meso-Neoproterozoic strata. Primarilysummarizing the characteristics of these deposits in this paper, the author illustrate the showingform of continentall extensional tectonic system in cover strata, and major features of similar Calintypical metallogenesis. On the basis of systematic analysis of genetic relationship of extensionaltectonics with gold-silver deposits, and their orientational relation, the author suggests that Meoproterozoic strata must be regarded as new important strategic prospect areas for gold andsilver deposits in the Jin-Lu platformdepression in south Xiapinling, Henan and ShanLxiProvinces; and in east Yanshan, as well as in center-west Yanshan, and north Taihang moutains.At the some time, the author further suggest that the sedimentary covers including Meoproterozoic system, in the North China platform, also should be regarded as prospect areas forsearch gold and silver deposits controlled by extensinal tectonic.