摘要
本文基于对大坪金矿成矿流体中矿化剂来源、成矿时代和成矿流体形成演化过程中水 -矿化剂 -金耦合作用关系的研究 ,探讨了大坪金矿床形成的可能机制。研究结果表明 ,大坪金矿的成矿时代约为 50 Ma(喜山早期 ) ,金成矿所需的矿化剂主要来自深部。大坪金矿床之所以形成在喜山早期 ,主要是通过喜山早期富矿化剂的深源流体上升 ,加入原在闪长岩体内循环的贫矿化剂流体 。
Based on the studies of mineralizer source, geochronology and coupled relationships among water, mineralizer and gold, this paper discussed the mineralization mechanism of the deposit. It is concluded that the age of the Daping gold deposit is about 50Ma±(Himalayan period), and the mineralizers such as sulfur and carbon dioxides are derived mainly from the mantle. The evolution process of ore forming fluid in the Daping gold deposit can be summarized as follows: the mineralizer rich deep seated fluid, which was formed at the crust extension tectonic setting in the Early Himalayan period when mantle derived magma intruded, ascended and added into the mineralizer depleted fluid cycling in faults within diorite in the area, then the mineralizer depleted fluid was converted to the mixing fluid containing sufficient mineralizer, which is able to extract a great amount of gold from the surrounding rocks, and then the gold in the fluid was precipitated at suitable place to form the gold deposit.
出处
《矿物学报》
CAS
CSCD
北大核心
1999年第1期28-33,共6页
Acta Mineralogica Sinica
基金
国家攀登计划 A-3 0项目资助
关键词
金矿床
矿化剂
矿床成矿
地壳拉张
Daping gold deposit
mantle derived mineralizer
Early Himalayan
crustal extension
