Geochronology of Yulekenhalasu porphyry copper deposit in northtern Junggar area, Xinjiang, China
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摘要:
玉勒肯哈腊苏铜矿是近几年准噶尔北缘卡拉先格尔斑岩铜矿带发现的又一个中型斑岩铜矿，其成岩成矿年代学的研究可以对矿床模型构建、区域成矿规律的总结提供制约。矿区侵入岩发育，矿化主要受闪长玢岩控制，少部分赋存在似斑状黑云母石英二长岩和北塔山组火山岩、火山碎屑岩中。本文利用锆石LA-ICP-MS U-Pb法和辉钼矿Re-Os法对矿区岩体和矿化进行了成岩成矿年代学研究。结合前人的研究，认为矿区存在5次主要岩浆侵入事件：382Ma石英闪长岩侵入，379Ma形成含矿闪长玢岩，375~374Ma形成似斑状黑云石英二长岩，348Ma形成黑云母石英斑岩脉，266Ma形成二长斑岩，前三次岩浆侵入活动对应构造环境为板块俯冲阶段，后二次岩浆侵入活动为后碰撞阶段。9件辉钼矿样品Re-Os同位素等时线年龄为373.9±2.2Ma，表明铜钼成矿时代为中泥盆世晚期，与闪长玢岩侵入有关。
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关键词:
- U-Pb和Re-Os法 /
- 中泥盆世 /
- 斑岩铜矿 /
- 玉勒肯哈腊苏 /
- 新疆
Abstract:Yulekenhalasu copper deposit is a medium-sized porphyry deposit found in recent years in Kalaxiange'er porphyry copper metallogenic belt in northtern Junggar area.Study on its geochronology will help further set up metallogenic model and summarize regional ore-forming pattern.Mang intrusive rocks are exposed in the ore district.The Cu mineralized mainly occurs in the diorite porphyry with subordinate porphyroid biotite quartz monzonite and volcanic rocks and volcaniclastic rocks of Beitashan Formation.This paper studies geochronology of intrusive rocks and mineralization using zircon LA-ICP-MS U-Pb and molybdenite Re-Os method.Based on our and other people data, magma intrusion events in the Yulekenhalasu ore district can be divided into five stages: Quartz diorite invading at 382Ma, ore-bearing diorite porphyry forming at 379Ma, porphyroid biotite quartz monzonite forming at 375 to 374Ma, biotite quartz porphyry invading at 348Ma, and quartz monzonite porphyry forming at 266Ma.Three stages before are formed during the subduction of plate, and other stages corresponds to a period of postcollision during Late Paleozoic.Seven samples of molybaenite Re-Os isochron age is 373.9±2.2Ma, suggesting the Cu-Mo mineralization occurred in the Late Middle Devonian, and relating to the diorite porphyry.
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Key words:
- U-Pb and Re-Os age /
- Middle Devonian /
- Copper deposit /
- Yulekenhalasu /
- Xinjiang
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图 1
玉勒肯哈腊苏铜矿区地质略图 (据新疆地质矿产勘查开发局第四地质大队，2009修改)
Figure 1.
Simplified geologic map of the Yulekenhalasu copper deposit
图 2
玉勒肯哈腊苏铜矿联合剖面图 (据刘国仁等，2010)
Figure 2.
Combine geological section of the Yulekenhalasu copper deposit (after Liu et al., 2010)
图 3
玉勒肯哈腊苏矿区岩体特征
Figure 3.
Characteristic of plutons in the Yulekenhalasu ore district
图 4
玉勒肯哈腊苏铜矿辉钼矿特征
Figure 4.
Characteristic of molybdenite in the Yulekenhalasu copper deposit
图 5
玉勒肯哈腊苏矿区岩体中代表性锆石的阴极发光图
Figure 5.
Cathodoluminescence images of representative zircons from the plutons in the Yulekenhalasu ore district
图 6
玉勒肯哈腊苏矿区岩体锆石LA-ICP-MS U-Pb年龄
Figure 6.
Zircon LA-ICP-MS U-Pb age of the plutons from the Yulekenhalasu ore district
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