巴尔喀什成矿带阿克沙套云英岩型钨钼矿床地质特征与铼-锇同位素测年分析

李勇; 陈宣华; 屈文俊; 王志宏; 杨农; 陈正乐; 韩淑琴

巴尔喀什成矿带阿克沙套云英岩型钨钼矿床地质特征与铼-锇同位素测年分析

1.
中国地质科学院, 北京 100037
2.
中国地质科学院地质力学研究所, 北京 100081
3.
国家地质实验测试中心, 北京 100037

基金项目:

国家科技支撑计划重点项目 2007BAB25B02

详细信息

作者简介:
李勇(1980-), 男, 硕士研究生, 构造地质学专业。E-mail:colyly@163.com

中图分类号: P618.4
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- 被引次数: 0
出版历程
- 收稿日期: 2010-06-09
- 刊出日期: 2010-12-01

GEOLOGICAL CHARACTERISTICS AND RE-OS ISOTOPIC DATING OF AKSHATAU GREISEN-TYPE W-MO DEPOSIT IN BALKHASH METALLOGENIC BELT

1.
Chinese Academy of Geological Sciences, Beijing 100037, China
2.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijijng 100081, China
3.
National Research Center for Geoanalysis, Beijing 100037, China

摘要

摘要: 哈萨克斯坦阿克沙套大型钨钼矿床处于中亚成矿域巴尔喀什成矿带内。该矿床为云英岩型浸染状矿床, 具有云英岩型矿床的典型矿物组合、围岩蚀变、矿体形态和结构构造。矿区产出有伟晶岩、石英长石脉, 含有钨钼矿、石英和黄玉云英岩矿体等。本文对阿克沙套钨钼矿床辉钼矿样品进行了铼-锇同位素分析, 得到辉钼矿模式年龄(平均值)为289.3 Ma, 处在早二叠世。分析认为, 阿克沙套云英岩型钨钼成矿作用是晚石炭世中亚成矿域大规模斑岩型铜钼成矿作用延续的结果, 属中亚造山带海西晚期构造-岩浆活动的产物。
- 铼-锇同位素年龄 /
- 辉钼矿 /
- 成矿时代 /
- 云英岩型钨钼矿床 /
- 巴尔喀什成矿带
Abstract: The Akshatau disseminated Be-W-Mo deposit is a large-scale greisen-type deposit in the Balkhash metallogenic belt of Central Asian Metallogenic Domain, with typical mineral compositions, wall rock alterations, ore body shapes, and ore texture and structures of greisen-type deposit. The ore field has yielded pegmatites and quartz feldspar veins, bearing W-Mo minerals, quartz and topaz greisen. In this paper, an average molybdenite model age of 289.3 Ma has been obtained through Re-Os isotopic dating for the molybdenite samples from Akshatau W-Mo deposit, suggesting greisen-type W-Mo mineralization in the Early Permian. The Akshatau greisen-type W-Mo mineralization is considered to be the continuation of the Late Carboniferous large-scale porphyry copper-molybdenum mineralization in the Central Asian Metallogenic Domain and a product of the Late Hercynian tectono-magmatic activity in the Central Asia Orogeny.
- Re-Os isotopic age /
- molybdenite /
- metallogenic epoch /
- greisen-type W-Mo deposit /
- Balkhash metallogenic belt

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图 1 阿克沙套钨钼矿床地质简图与剖面示意图(据Daukeev et al. 2004^[2])

A.地质简图; B.示意纵剖面。1.下石炭统火山岩类; 2.石炭纪次火山花岗闪长斑岩; 3.石炭纪石英二长岩和花岗闪长岩; 4-7.二叠纪阿克沙套侵入杂岩:4.第Ⅰ期粗粒似斑状花岗岩; 5.第Ⅰ期其它侵入体的细粒杂斑状花岗岩; 6.第Ⅱ期中粒花岗岩; 7.第Ⅱ期细粒淡色花岗岩; 8.阿克沙套杂岩未分类花岗岩; 9.交代成因石英岩; 10.多孔白云母石英云英岩; 11.花岗岩和石英二长岩中的石英脉云英岩岩体; 12.外接触带岩石中网状脉云英岩化作用的分带; 13.沸石化作用; 14.阿克沙套深成岩体在深度2.5~3 km处的接触带轮廓; 15.阿克沙套深成岩体在深度450 m处的接触带轮廓; 16.隐伏花岗岩岩钟在地表的投影; 17.角岩化岩石边界; 18.高温角岩与低温角岩之间的界线

Figure 1. Schematic geological map of the Akshatau W-Mo deposit and schematic latitudinal section (after Daukeev et al. 2004^[2])

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图 2 阿克沙套钨钼矿床石英脉云英岩矿体群的形态结构水平分带(据Daukeev et al. 2004^[2])图中给出231脉(左)和146~147脉(右)的形态结构分带

Figure 2. Morphostructural zonings, of clusters of quartz-vein greisens bodies in the Akshatau greisen-type W-Mo deposit (231 and 146~147) (after Daukeev et al. 2004^[2])

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图 3 花岗岩中石英脉云英岩矿体垂向不对称矿石-交代分带(A)和侵入体上部网状脉分带(B)(据Daukeev et al. 2004^[2])

1.下石炭统火山岩类；2.上志留统砂页岩沉积；3.侵入体顶部带未分岩石；4.石炭纪次火山花岗闪长斑岩；5.石炭纪石英二长岩和花岗闪长岩；6-9.二叠纪阿克沙套侵入杂岩；6.第Ⅰ期粗粒似斑状花岗岩；7.第Ⅰ期其它侵入体的细粒杂斑状花岗岩；8.第Ⅱ期中粒花岗岩；9.第Ⅱ期细粒淡色花岗岩；10.阿克沙套杂岩未分花岗岩；11.交代成因石英岩；12-15.云英岩类；12.多孔石英云英岩；13.致密石英云英岩；14.石英黄玉云英岩；15.石英白云母云英岩；16.多孔白云母石英云英岩；17.花岗岩和石英二长岩中的石英脉云英岩岩体；18.外接触带岩石中网状脉云英岩化作用的分带；19.沸石化作用；20.阿克沙套深成岩体在深度2.5~3 km处的接触带轮廓；21.阿克沙套深成岩体在深度450 m处的接触带轮廓；22.隐伏花岗岩岩钟在地表的投影；23.角岩化岩石边界；24.云英岩化蚀变带边界；25.高温角岩与低温角岩之间的界线

Figure 3. Vertical asymmetric orc-melasomalic zonings of quartz-vein greisen bodies in granitcs(A) and of supra-inlrusive stockwork (B) (after Daukecv et al.2004^[2])

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图 4 阿克沙套的深成花岗岩体的三阶段构造成矿模式(据Daukeev et al. 2004^[2])

Figure 4. Three-phase structure of the Akshatausky granite pluton (after Daukeev et al. 2004^[2])

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表 1 哈萨克斯坦巴尔喀什成矿带阿克沙套W-Mo矿床辉钼矿样品和标准物质Re-Os同位素分析数据

Table 1. Re-Os isotopic data for molybdenites from Akshatau W-Mo deposits in Balkhash metallogenic belt, Kazakhstan and the standard material

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