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黄金科学技术 ›› 2018, Vol. 26 ›› Issue (4): 473-480.doi: 10.11872/j.issn.1005-2518.2018.04.473

• • 上一篇    下一篇

滇西北雪鸡坪斑岩型铜矿构造特征与成矿作用研究

刘学龙(),杨富成,张昌振,罗应,王帅帅   

  1. 1昆明理工大学国土资源工程学院,云南 昆明 650093
  • 收稿日期:2018-04-26 修回日期:2018-07-10 出版日期:2018-10-10 发布日期:2018-10-17
  • 作者简介:刘学龙(1983-),男,甘肃张掖人,副教授,从事西南三江地区的地质矿产研究工作。xuelongliu@foxmail.com
  • 基金资助:
    云南省科学技术奖—杰出贡献奖项目“西南三江复合成矿作用疑难问题研究”(2017001);昆明理工大学重点学科建设经费项目“地质资源与地质工程(省级一流学科)”(1407839305);国家自然科学基金项目“云南格咱岛弧印支期斑岩型铜矿床变化与保存研究”(41502076);云南省科技领军人才计划项目“复合成矿作用典型矿床研究”(2013HA001)

Structural Characteristics and Mineralization of Xuejiping Porphyry Copper Deposit in Northwest Yunnan

Xuelong LIU(),Fucheng YANG,Changzhen ZHANG,Ying LUO,Shuaishuai WANG   

  1. 1Facculty of Land and Resource Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China
  • Received:2018-04-26 Revised:2018-07-10 Online:2018-10-10 Published:2018-10-17

摘要:

滇西北雪鸡坪斑岩铜矿床位于义敦—中甸岛弧带的南段,属区内印支期斑岩成岩成矿作用的典型矿床之一。对雪鸡坪铜矿床控矿构造特征进行了系统梳理与分析研究,结果表明矿体的产出形态受NW-NNW向断裂及褶皱的严格控制,矿体形成与印支期构造—岩浆活动关系密切。含矿斑岩中节理(裂隙)较为发育,并发育有大量的黄铁矿±黄铜矿+石英脉体充填,黄铁矿和黄铜矿等金属硫化物主要沿节理(裂隙)发育形成大量的细脉、细网脉体,黄铁矿化的发育强度与岩体中裂隙的发育程度密切相关。另外,对雪鸡坪铜矿区灰岩地层的有效圈定表明,灰岩与石英闪长玢岩呈侵入接触关系,加之区内广泛的岩浆热液活动,具备矽卡岩矿体形成的基本条件,为该区下一步找矿勘查工作提供了科学依据。

关键词: 斑岩铜矿, 构造特征, 节理(裂隙), 成矿作用, 找矿方向, 印支期, 雪鸡坪, 滇西北

Abstract:

Xuejiping copper deposit is located in the southern part of Yidun-Zhongdian arc belt,which is a typical deposit of porphyry mineralization in the Indosinian period.The ore-control structural characteristics of Xuejiping copper deposit was systematically analyzed,which shown the orebody’s outputting is strictly controlled by the NW-NNW fracture and fold structure and the formation of ore is closely related to the Indosinian tectonic-magmatic activities.The joints (fissure) are more developed and have a lot of pyrite± chalcopyrite+quartz vein filling in ore-bearing porphyry.Metal sulfides such as pyrite and chalcopyrite are mainly filled along the joint (fissure) to form a large number of metal sulfide veins and fine veins,which shown that there is a close relationship between the developmental intensity of pyrite and the development of cracks in the rock mass.In addition,the effective delineation of limestone strata in Xuejiping mine area indicates that intrusive contact between limestone and quartz diorite porphyrite.Coupled with the extensive magmatic hydrothermal activity in the region,it should be believed that the basic conditions of skarn orebody formed,the results and provide a scientific basis for the mineral exploration.

Key words: porphyry copper deposit, structural characteristics, joint(fissure), mineralization, prospecting direction, Late Triassic, Xuejiping, Northwest Yunnan

中图分类号: 

  • P618.41

图1

滇西北雪鸡坪斑岩型铜矿地质简图 1.矿体和编号;2.印支期石英闪长玢岩;3.印支期石英二长斑岩;4.斑状石英闪长岩;5.石英安山岩;6.二长花岗斑岩;7.第四系残、坡积物;8.上三叠统图姆沟组二段:板岩、砂岩、安山岩,局部夹火山碎屑岩;9.上三叠统曲嘎寺组三段:深灰色薄层状灰岩夹绢云板岩;10.钾硅化带;11.石英绢云母化带;12.青磐岩化带;13.蚀变界线;14.断层;15.产状"

图2

雪鸡坪铜矿区17号勘探线地质剖面图 1.矿体及编号;2.石英闪长玢岩;3.石英二长斑岩;4. 图姆沟组二段板岩、砂岩、安山岩,局部夹火山碎屑岩;5.第四系;6.探槽编号;7.钻孔编号;8.矿体及编号"

图3

雪鸡坪铜矿区矿化显微特征 (a)岩石节理裂隙较为发育,并发育有大量的黄铁矿(Py)±黄铜矿(Ccp)+石英脉(Q)体充填;(b)呈浸染状分布的黄铜矿;(c)黄铜矿呈浸染状分布在微裂隙中,黄铁矿发育有压碎结构"

图4

雪鸡坪铜矿区断层及节理(裂隙)特征"

表1

雪鸡坪铜矿区节理产状统计"

点号 产状序号 倾向/(°) 走向/(°) 倾角/(°) 点号 产状序号 倾向/(°) 走向/(°) 倾角/(°)
No.03 20 290 31 No.32 310 40 25
65 335 78 73 343 62
No.09 152 62 70 No.41 122 32 69
292 22 72 40 310 42
253 343 80 132 42 53
No.15 285 15 72 No.155 110 20 85
225 315 54 40 310 31
75 345 16 270 0 35
No.17 142 52 54 140 50 34
310 40 78 G.17 75 345 16
13 283 40 182 272 86
No.18 95 5 78 237 327 87
34 304 71 G.21 326 56 84
278 8 79 65 335 64
No.32 194 284 6

图5

雪鸡坪矿区节理走向玫瑰花图"

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