云南个旧矿集区区域构造-岩浆演化与锡铜多金属成矿系统

徐启东; 夏庆霖; 成秋明

云南个旧矿集区区域构造-岩浆演化与锡铜多金属成矿系统

徐启东^{1, 2,},
夏庆霖^{1, 2},
成秋明^{1, 2}

1.
中国地质大学资源学院, 湖北武汉 430074
2.
中国地质大学地质过程与矿产资源国家重点实验室, 湖北武汉 430074

基金项目:

中国地质调查局项目“重要矿产资源三维预测评价方法与示范” 1212010633810

详细信息

作者简介:
徐启东(1957-), 男, 教授, 主要从事矿床学和地球化学方面的研究.E-mail: xuqd@cug.edu.cn

中图分类号: P611
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出版历程
- 刊出日期: 2009-03-25

Tectono-Magmatic Evolution Related to Metallogenic System in Gejiu Ore-Concentration Area, Southeast Yunnan of China

XU Qi-dong^{1, 2
,},
XIA Qing-lin^{1, 2},
CHENG Qiu-ming^{1, 2}

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

摘要

摘要:
个旧矿集区是滇东南最重要的锡铜多金属矿产地之一, 形成了云英岩-石英脉型矿化、与矽卡岩化有关的锡石-硫化物型矿化、蚀变基性火山-次火山岩型矿化和与断裂有关的各种脉型矿化构成的锡铜多金属成矿系统.根据区域构造-岩浆演化与锡铜多金属矿化系统的配置关系研究, 认为燕山晚期复式花岗岩体侵位进入以中三叠统为主的碳酸盐岩地层组成的褶皱带中, 锡铜等金属元素的成矿富集产生于花岗岩体与围岩接触带及其附近发生的接触交代和更远处发生的交代-充填过程, 成矿元素主要源自燕山期中下部地壳物质熔融形成的花岗岩浆和印支期裂谷环境中来自地幔的玄武岩-辉绿岩-辉长岩类, 多期脉动式的岩浆活动驱动了一个长效的热液系统, 这些要素共同构筑了这一巨量的金属矿集区.由此建立了个旧矿集区的区域成矿模型, 并对进一步寻找新的矿化类型提出了理论线索.
- 区域构造环境 /
- 多期岩浆活动 /
- 源区 /
- 矿化类型 /
- 滇东南
Abstract:
Gejiu ore-concentration area is one of the most important occurrences of Sn-Cu polymetallie mineralization in Southeast YunnarL Sn-Cu polymetallic system of mineralization in the area includes Sn-W greisen-quartz vein type, Cu-massive-sulfide cassiterite type, Cu-Sn altered-basic-rock type, and Sn-Pb-Zn vein types of deposits. The study of the relationship between the tectono-magmatic evolution and the Gejiu system of mineralization shows that Sn-Cu polymetal enrichment occurred in and near the contact zone between granite and wall rock through contact metamorphism, metasomatic and filling processes, when the composite granites invaded into folded limestones of Middle Triassic (Gejiu Formation). These metals may come from two reservoirs, i.e. granitic magma originated from the middle-lower crust in the Yenshan period and basalt-diabase-gabbro from the mantle in the Indo-Chinese period. Pulsatory magmatic activities are believed to be the main driving force for the formation of the hydrothermal system for the ore-forming progress. A regional model of mineralization is proposed in this study for assisting mineral exploration and prediction for new types of mineral deposits in this area.
- tectonic setting /
- composite magmatism /
- reservoir /
- type of mineralization /
- Southeast Vunnan.

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图 1 滇东南及邻区古生代以来主要构造事件演化程式

Fig. 1. Tectonic progresses since Paleozoic in Southeast Yunnan and its adjacent region

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图 2 个旧矿集区岩浆活动与不同类型矿化产状和分布的样式

①云英岩-石英脉型矿化; ②锡石-硫化物型矿化; ③蚀变基性火山-次火山岩型矿化; ④与断裂有关的各种脉型矿化; ?表示推测可能出现的矿化类型部位

Fig. 2. Spatial distributions of magmatic activity and different types of mineralization in Gejiu area

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图 3 个旧矿集区不同矿化类型与主要成矿元素源区之间关系在不同观察尺度中的表现

a.个旧矿集区的主要控矿要素和矿化的分布; b.区域构造部位和铅同位素组成指示了成矿源区的壳-壳混合性质; c.矿集区内三类主要的矿化类型: c₁为矽卡岩型矿化(壳源为主); c₂为蚀变基性岩型和构造破碎带控制脉型矿化的复合(分别以幔源和壳源为主); d.图 3c中三类矿化的露头影像(d₁为接触带型; d₂为蚀变基性岩型; d₃为风化改造的构造破碎带型)

Fig. 3. Views of relationship between the ore-forming types and the sources of ore-elements in Gejiu area

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