闽中尤溪－德化－永泰地区金矿地质特征、成矿条件及成矿规律

Geological Characteristics, Ore-Forming Conditions and Regular Pattern of Gold Ores in Youxi, Dehua and Yongtai Areas of Middle Fujian

闽中尤溪－德化－永泰地区中元古界基底变质岩在火山岩中呈“天窗”断续出露，火山－侵入岩浆活动强烈，北东、北西向断裂发育，是我省金矿潜在的有找矿远景的地区之一。本文通过对控制成矿的地质因素的分析研究，认为：含基性－中酸性火山沉积建造的中元古界卓地组、葛坑组基底变质岩是金的重要矿源层，是成矿的前提条件；各种构造，尤其是断裂构造，控制了成矿带的展布和矿床（点）的形成，并决定了矿（化）体的定位空间，是成矿的先决条件；多期次的岩浆活动为成矿提供热源、热液源的部分矿源，是成矿的必要条件。成矿时期始于晋宁期，印支期有明显的矿化活动，燕山期为主要的成矿时期。同时，阐述了由控矿因素所制约的若干成矿规律，进而提出该地区金的区域成矿模式，并对金的潜在资源和找矿远景进行了初步预测和评价。

The Middle Proterozoic basement metamorphic rocks in Yongxi, Dehua anti Yongtai areas are distributed intermittently over the volcanic rocks as 'window', where there are intensive magmatic activities of volcanic-intrusive rocks and the northeastern and northwestern well-developed faults. The surveyed area is one of the prospective areas of searching gold ores in Fujian Province. Based on the analysis results of the ore-control geological factors, it is considered that in the surveyed area the Middle Proterozoic basement metamorphic rock with a bole-intermediate acidity volcanic and sedimentary formation is the important gold source bed, that fracture structures control the distribution of gold ores and the location space of gold ore (mineralized) bodies and that thermal and hydrothermal solution source and some mineral source are derived from the mutiperiodic magmatic activities. It is inferred that the metallogenic period of gold ores in the surveyed area was in Jinning Stage (Late Proterozoic), and the Yanshanian Stage is a major ore-forming period. In the poper the author also made a discussion on some oreforming regular patterns of gold ores, presented a regional metallogenic model of gold ores, and made a preliminary calculation and estimation of the potential resources and ore-hunting prospective area of gold ores in the surveyed area.