燕山地区与变质核杂岩一伸展构造有关的金、银矿找矿远景探讨

该文在概述燕山地区前寒武系中金的背景值和近年在中、上元古界中新发现许多金、银矿床等事实的基础上,从伸展构造理论出发,研究了燕山地区金、银贵金属矿床的形成机制,认为中、上元古界中金、银贵金属矿床的形成与变质核杂岩一伸展构造密切相关,由此对燕山地区前寒武纪金、银贵金属矿远景进行了预测,并提出了进一步工作的建议。

THE DISCUSSION ABOUT PROSPECTS OF GOLD AND SIL VER ORES RELATED TO METAMORPHIC CORE COMPLEX-EXTENIONAL TECTONICS IN YANSHAN AREAS

in this paper, the author introduces the distribution of gold and st1Ver ores formedin PreCambrian strata in Yanshan areas. Mainly introduces the distribution characteristics andregulation of An(Ag) and relative elements: Ph. B. F. As. Ba. S in Carbonate rocks for middle andupper Proterozoic. The distribution of gold and silver deposits are controled by extensionaltectonic setting between Archean (or early Proterozoic) and middle and upper Proterozoic.Multiple extersional decollements in Yanshan areas are represented by bedding ductile shear zonescharacterized by developiflg on different levels at different stages of evolution of the crust. Theseextensional decollements resulted from bedding shearing along the existed tectonic planes (mainly"unconformities") or boundaries between rock series or lithological units.In recent years, the geologists have discovered that metallogentic belts of such gold and silverores depoSits which are occurred in Gaoyuzhuang formation and Wurnishan formation are famousin North China. The contents of gOld and silver are higher, about 20-100ppm. Orebodies reachlarge scale with great extension. The author proPOses a primary idea which conce~ prospectingorientation, metallogenetic conditions and sustained propects. Thus is OPen a new way for findingnew type of gold and silVer deposits in Yanshan areas.