中南地区金矿分布规律浅议

A PRELIMINARY DISCUSSION ON DISTRIBUTION REGULARITY OF GOLD DEPOSITS IN CENTRAL SOUTH CHINA REGION

本文就我国中南4省区金矿分布的一般规律及金成矿地质条件进行了初步探讨,提出中南地区金矿分布5大规律:空间上集中分布具一定的统一性;赋矿层位多为古老的变质岩系;在空间分布和成因上与岩浆岩密切相关;金成矿在赋矿围岩上虽无较大的选择性,但仍偏重基性火山岩和侵入岩以及有机质、炭质高的沉积岩和变质岩;金的成矿期主要是从前寒武纪到中生代。文章并以部分典型矿床为例,论述了中南4省区金矿控矿因素除矿源层(体)、岩浆岩、构造这3个要素外,还应将深部液态矿源层及区域变质作用视为同等重要的控制因素。

In this paper, a preliminary discussion is made on the general distri-bution regularity of gold deposits and the geological factors of gold metal-logenesis in four provinces of Central South China region, and the distri-bution regularity is presented as follows: 1. The gold deposits are spatiallycentralized in distribution with certain unity in their genesis; 2. The gold-bearing beds are mostly located in ancient metamorphic rocks series; 3. Thegold deposits are closely related to magmatic rocks in space and their genesis;4. Although gold deposits can occur in all kinds of host rocks, they preferto occur in basic volcanic rocks and intrusive rocks as well as sedimentary and metamorphic rocks with high content of organic and carbonaceousmatters. 5. Minerdlization period of gold deposits ranges from Precambrianto Mesozoic era. In addition, taking parts of typical deposits as examples,this paper describes gold ore-controlling factors in four provinces of CentralSouth China region and regards, in particular, the deep liquid ore sourcebed and regional metamorphism as equally important except three factorssuch as ore source beds (bodies), magmatic rocks and structures.