闪锌矿流体包裹体^40Ar-^39Ar法定年探讨——以广东凡口铅锌矿为例

蒋映德　邱华宁　肖慧娟

闪锌矿流体包裹体^40Ar-^39Ar法定年探讨——以广东凡口铅锌矿为例

蒋映德　邱华宁　肖慧娟

- 蒋映德（中国科学院广州地球化学研究所同位素年代学和地球化学重点实验室,广州,510640;中国科学院研究生院,北京,100049）　　　　　　邱华宁（中国科学院广州地球化学研究所同位素年代学和地球化学重点实验室,广州,510640）　　　　　　肖慧娟（中国科学院广州地球化学研究所同位素年代学和地球化学重点实验室,广州,510640;中国科学院研究生院,北京,100049）
基金项目:
国家自然科学基金资助项目（40472048）. 致谢凡口铅锌矿地质科许水平科长、刘慎波副科长、刘其斌高级工程师;生产技术部戴晶平部长、杨汉壮高级工程师在地质取样工作中给予了大力的支持和帮助;评审专家对稿件提出了建设性的修改意见,对改进文章质量起了重要作用,在此表示衷心的谢意.

收稿日期: 2006-03-27

修回日期: 2006-06-05

刊出日期: 2006-10-31

Preliminary investigation of sphalerite 40Ar-39 Ar dating by crushing in vacuum:a case study from the Fankou Pb-Zn deposit, Guangdong province

Received Date: 27 March 2006

Revised Date: 05 June 2006

Publish Date: 31 October 2006

摘要

摘要: 本文首次把流体包裹体40Ar-39Ar测年技术应用于闪锌矿,对凡口铅锌矿的闪锌矿进行了直接定年分析,获得了可靠的等时线年龄和坪年龄.闪锌矿中次生包裹体沿裂隙分布而易于提取,真空击碎的开始5个阶段以次生包裹体释气为主,其数据点在36Ar/40Ar-39Ar/40Ar图上构成等时线,年龄为(233.6±7.4)Ma(1σ),对应的40Ar/36Ar初始比值为703±27,表明次生包裹体含有过剩氩,其等时线年龄可能代表了成矿后的一期热液活动的时间.真空击碎第7至17阶段(末阶段)以原生包裹体释气为主,这些阶段构成了平坦的年龄坪,对应的数据点在36Ar/40Ar-39Ar/40Ar图上构成线性关系很好的等时线,等时线年龄(265.8±1.0)Ma与坪年龄(264.4±0.7)Ma非常一致,代表了闪锌矿的成矿年代,它表明凡口铅锌矿的一期矿化作用发生在二叠纪中期;等时线截距对应的40Ar/36Ar初始比值为291±2,表明原生包裹体不含过剩氩.闪锌矿流体包裹体40Ar-39Ar定年的成功将为金属硫化物矿床直接定年开辟一条有效的新途径.
- ^40Ar-^39Ar法 /
- 闪锌矿 /
- 流体包裹体 /
- 反等时线 /
- 凡口铅锌矿
- ^40Ar-^39Ar technique /
- Sphalerite /
- Fluid inclusion /
- Inverse isochron /
- Fankou Lead-Zinc deposit

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参考文献(60)

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闪锌矿流体包裹体^40Ar-^39Ar法定年探讨——以广东凡口铅锌矿为例

Preliminary investigation of sphalerite 40Ar-39 Ar dating by crushing in vacuum:a case study from the Fankou Pb-Zn deposit, Guangdong province

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