新疆东准噶尔顿巴斯套金矿床含金黄铁矿Rb-Sr等时线年龄及地质意义

李欢; 李艳军; 魏俊浩; 石文杰; 李红梅

doi:10.3799/dqkx.2018.988

新疆东准噶尔顿巴斯套金矿床含金黄铁矿Rb-Sr等时线年龄及地质意义

doi: 10.3799/dqkx.2018.988

李欢^1,,
李艳军^1,2, ,,
魏俊浩^1,2,
石文杰^1,2,
李红梅³

1.
中国地质大学资源学院, 湖北武汉 430074
2.
固体矿产勘查国家级实验教学示范中心, 湖北武汉 430074
3.
湖北省地质调查院, 湖北武汉 430034

基金项目:

国家自然科学基金项目 41772071

中央高校基本科研业务费区域引导专项 CUGQYZX1708

国家自然科学基金项目 41672083

详细信息

作者简介:
李欢(1987-), 男, 博士后, 主要从事矿床地球化学研究工作

通讯作者:
李艳军

中图分类号: P597
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出版历程
- 收稿日期: 2018-06-06
- 刊出日期: 2018-12-15

Rb-Sr Isochron Age of Auriferous Pyrites from Dunbasitao Gold Deposit in East Junggar, Xinjiang, and Its Geological Significance

Li Huan^1
,,
Li Yanjun^{1,2
, ,},
Wei Junhao^1,2,
Shi Wenjie^1,2,
Li Hongmei³

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
National Demonstration Center for Experiment of Mineral Exploration Education, Wuhan 430074, China
3.
Hubei Geological Survey, Wuhan 430034, China

摘要

摘要: 新疆东准噶尔地区金矿床矿石矿物的直接定年研究比较缺乏.顿巴斯套金矿床位于该地区阿尔曼泰构造带东段北东侧，为该构造带中规模最大的金矿床.应用Rb-Sr同位素定年方法对该矿床9件黄铁矿样品进行了成矿时代测定，获得等时线年龄为268±3 Ma（MSWD=0.7），该年龄与矿区西北部高钾钙碱性花岗岩成岩时代一致，成矿与中二叠世构造岩浆活动具有密切关系.同时结合近些年来金矿床成岩成矿年代学研究成果，认为中二叠世（270~260 Ma）为东准噶尔地区一个重要的金成矿时限.黄铁矿Rb-Sr年龄的厘定，显示顿巴斯套金矿床为中二叠世东准噶尔地区后碰撞伸展背景下构造-岩浆-流体活动的产物，也为东准噶尔金矿床成矿作用对比和找矿实践提供了参考.
- Rb-Sr同位素定年 /
- 黄铁矿 /
- 中二叠世 /
- 顿巴斯套金矿床 /
- 东准噶尔 /
- 地质年代学
Abstract: The study on direct dating of ore minerals in gold deposits in East Junggar is relatively scarce. The Dunbasitao gold deposit, located in the northeastern part of eastern Aermantai structural belt, is one of typical gold deposits in the region. Rb-Sr isotopic dating of 9 pyrites separated from the Dunbasitao gold deposit yielded an isochron age of 268.3±2.8 Ma (MSWD=0.7), and this result is in good agreement with the high-potassium calc-alkaline granite in the northwestern part of ore district, indicating that gold mineralization was related to granite crystallization.Meanwhile, combining with the studies about metallogenic chronology of diagenetic and mineralization in East Junggar in recent years, it is suggested that Middle Permian from 270 Ma to 260 Ma may be an important time range of gold mineralization in East Junggar, Xinjiang. According to previous studies and the Rb-Sr ages reported, it is interpreted that the Dunbasitao gold deposit was formed in an post-collision extended environment related to lithospheric extension with tectonic, magma and fluid activities during the Middle Permian in East Junggar. The age of Dunbasitao gold deposit reported in this study is of great significance both for comparison studies in minerization of gold deposits in the region and practice for mineral exploration.
- Rb-Sr isotopic dating /
- pyrite /
- Middle Permian /
- Dunbasitao gold deposit /
- East Junggar /
- geochronology

HTML全文

图 1 东准噶尔大地构造位置(a)及地质矿产简图(b)

a.据董连慧等(2009)修改；b.据张栋等(2011)修改；①布尔根蛇绿岩带; ②阿尔曼泰蛇绿岩带; ③卡拉麦里蛇绿岩带; ④冰达坂蛇绿岩带; ⑤红柳河蛇绿岩带.Ⅰ.西伯利亚板块; Ⅱ.哈萨克斯坦-准噶尔板块; Ⅱ₁.萨吾尔山晚古生代大洋岛弧; Ⅱ₂.野马泉早古生代大陆岛弧; Ⅱ₃.准噶尔-吐哈陆块; Ⅱ₄.天山地区古生代复合弧盆系统; Ⅲ.塔里木板块.1.第四系; 2.中生界; 3.上石炭统; 4.下石炭统; 5.泥盆系; 6.志留系; 7.深大断裂带; 8.地层界线; 9.后碰撞花岗岩; 10.蛇绿岩; 11.金矿床(点); 12.研究区

Fig. 1. Sketch map of tectonic location(a) and the geological mineral resources (b) of East Junggar

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图 2 东准噶尔顿巴斯套金矿床地质简图(a)、采样钻孔平面分布(b)和L8号矿体垂直纵投影图(c)

据魏贤峰等(2013)修改.1.长石岩屑砂岩; 2.粉砂岩; 3.砂砾岩; 4.矿体及其编号; 5.闪长(玢)岩脉; 6.取样钻孔及编号; 7.勘探线及编号; 8.采样位置及编号

Fig. 2. Sketch geological map (a), distribution of the sampling drills of Dunbasitao gold deposit (b) and vertical projection map of No.8 orebody (c) in East Junggar

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图 3 东准噶尔顿巴斯套金矿床东矿区8号矿体7线地质勘探线剖面

据魏贤峰等(2013)修改

Fig. 3. The 7th line geological exploration section of the No.8 orebody in eastern mineralized district of Dunbasitao gold deposit in East Junggar

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图 4 东准噶尔顿巴斯套金矿床矿石类型以及矿化特征

a.网脉状蚀变长石岩屑砂岩型矿石; b.细脉状蚀变粉砂岩型矿石; c.条带状蚀变粉砂岩型矿石; d.团块状含炭质蚀变粉砂岩型矿石; e.浸染状蚀变岩屑砂岩型矿石, 显示可能至少存在两期黄铁矿; f.角砾状石英脉型矿石, 显示石英脉、粉砂岩碎块被黄铁矿及褐铁矿等矿物胶结.Q.石英；Py.黄铁矿；st.粉砂岩; Lm.褐铁矿；cc.方解石; ds.长石岩屑砂岩

Fig. 4. Ore type and mineralization features of Dunbasitao gold deposit in East Junggar

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图 5 东准噶尔顿巴斯套金矿床矿石镜下照片

a.早期自形-半自形黄铁矿(Py1)被中细粒黄铁矿(Py2)交代; b.粗粒黄铁矿(Py1)呈自形-半自形粒状结构, 多被后期的动力作用压碎; 中细粒半自形黄铁矿(Py2)晶形完整, 无微裂隙或微孔隙; c.中细粒半自形黄铁矿(Py2)和细粒黄铁矿(Py3), 无明显穿插; d.早期粗粒黄铁矿(Py1)被后期毒砂(Apy)交代; e.后期细粒的黄铁矿(Py3)和毒砂(Apy)呈共结边结构, 表明同期形成; f.黄铁矿(Py2)颗粒中呈椭圆状分布的包裹金.Py1.第1世代黄铁矿; Py2.第2世代黄铁矿; Py3.第3世代黄铁矿; Apy.毒砂; Gl.自然金

Fig. 5. Photomicrographs of selected ores from Dunbasitao gold deposit in East Junggar

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图 6 东准噶尔顿巴斯套金矿床黄铁矿Rb-Sr等时线年龄

4和7号测试点未参与等时线拟合, 原因见正文

Fig. 6. Rb-Sr isochron for pyrite samples from Dunbasitao gold deposit in East Junggar

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图 7 黄铁矿及其中原生包裹体的BSE图像

测试分析在武汉理工大学材料测试中心电子探针实验室完成.a.第2世代(Py2)黄铁矿, 极少发育微裂隙或微孔隙; b.黄铁矿中黑云母(Bt)包裹体; c.黄铁矿中钾长石(Kfs)包裹体; d.黄铁矿中黑云母(Bt)和钾长石(Kfs)包裹体

Fig. 7. BSE images of pyrite and its primary inclusions

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表 1 东准噶尔顿巴斯套金矿床9件黄铁矿样品Rb-Sr同位素比值及含量测定结果

Table 1. Rb-Sr isotopic data of 9 pyrite samples from Dunbasitao gold deposit in East Junggar

序号	样品号	Rb(10^-6)	Sr(10^-6)	⁸⁷Rb/⁸⁶Sr	⁸⁷Sr/⁸⁶Sr	误差(2σ)
1	DB-1	0.389 7	7.269	0.158 7	0.711 031	0.000 008
2	DB-2	2.031 0	6.753	0.874 2	0.713 543	0.000 009
3	DB-3	0.956 4	1.847	1.536 0	0.716 292	0.000 007
4	DB-4	1.573 0	2.471	1.879 0	0.715 989	0.000 015
5	DB-5	1.986 0	2.258	2.594 0	0.720 171	0.000 009
6	DB-6	2.874 0	2.115	4.017 0	0.725 775	0.000 007
7	DB-7	3.012 0	1.956	4.538 0	0.729 101	0.000 017
8	DB-8	3.579 0	1.475	7.153 0	0.737 582	0.000 010
9	DB-9	0.132 8	5.967	0.065 3	0.710 503	0.000 009
注：λ(⁸⁷Rb)=1.42×10^-11a^-1.

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表 2 东准噶尔金矿成矿年龄统计

Table 2. Mineralization ages of gold deposits from East Junggar

地区	金矿	测试对象	测试方法	成矿时代(Ma)	资料来源
	科克萨依	石英	Rb-Sr	227±24	李华芹和陈富文(2004)
	科克萨依	绢云母	Ar-Ar	275.8±5.2	闫升好等(2006a)
额尔齐斯带	阿拉塔斯	绢云母	Ar-Ar	283.1±5.2	闫升好等(2006b)
	萨尔布拉克	毒砂	Pb-Pb	304.1±7.4	李华芹等(1998)
	萨尔布拉克	流纹斑岩	Rb-Sr	292.1±7.3	李华芹等(1998)
	萨尔布拉克	石英	Rb-Sr	271±30	李华芹和陈富文(2004)
	阿克塔斯	斜长花岗岩锆石	SIMS U-Pb	309.9±6.7	纪珊珊(2013)
阿尔曼泰带	顿巴斯套	黄铁矿	Rb-Sr	268±3	本文
	库布苏	石英	Rb-Sr	269±11	李华芹和陈富文(2004)
	野马泉	石英	Rb-Sr	300±36	李华芹和陈富文(2004)
	野马泉	石英钠长斑岩	Rb-Sr	302±11	李华芹和陈富文(2004)
	双泉	绢云母	Ar-Ar	269±9
卡拉麦里带	双泉	绢云母	Ar-Ar	265±2	路彦明(2008)
	双泉	绢云母	Ar-Ar	260±4	徐斌等(2009)
	双泉	石英	Ar-Ar	269±8
	清水48号	石英	Rb-Sr	311±46	李华芹和陈富文(2004)
	清水48号	玄武玢岩	Rb-Sr	315±30	李华芹和陈富文(2004)
	索尔巴斯套	凝灰岩	Rb-Sr	265±7	李华芹和陈富文(2004)

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