摘要
(一)地质概况元阳大坪金矿床位于哀牢山构造变质带南段南西侧,沿金子河呈北西向带状分布。区内除少量煌斑岩、辉绿岩及中酸性脉岩外,其余均为闪长岩类。闪长岩体出露面积约100km^2,其中矿化面积约20km^2。外围为哀牢山变质岩系及古生代地层。
The Daping gold deposit belongs to a multimetallic deposit of goldsulphidquartz vein type. The quartz vein bearing ore develops in the diorite body, mainly filling in northwestward faults along both sides of Xiaoxinjie Fault regarded as the first order structure in the orefield. According to the analyses of samples collected along the section perpendicular to Xiaoxinjie Fault, it has been found that the contents of Au, Ag, Cu, Pb, Zn are high, and those of Co, Ni, etc, deep-source elements are even one to several ten times higher than the background values. In the middle part of the fault zone, the Ag/Au and Pb/Zn are the lowest as Au content reaches the peak value. All these facts indicate that Au did not concentrate from wall rock toward the fault zone, but had a deep-source, rose along the fault and removed to the both sides. Xiaoxinjie Fault in the deposit area is the channel of ore fluid and the northwestward fault along both sides of it is the ore-bearing structure.
出处
《云南地质》
1989年第2期147-153,共7页
Yunnan Geology
