云南金顶超大型铅锌矿床碳、氧、锶、铅同位素地球化学
Carbon, oxygen, strontium and lead isotopic geochemistry in the Jinding super-large Zn-Pb deposit, Yunnan Province
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文摘
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云南金顶铅锌矿是目前中国最大的铅锌矿,也是铅锌矿金属储量超过千万吨的世界级超大型矿床之一。对该矿床主矿化期和矿化后期方解石进行了系统的碳、氧、锶同位素分析,结果表明,主矿化期脉状方解石碳同位素变化范围大(δ~(13)C-23.0‰~-2.6‰),显示有机沉积物与海相碳酸盐岩混合碳的特征,氧同位素相对集中(δ~(18)O 22.1‰~23.5‰),类似于沉积岩,Sr含量较高(Sr 163~1920μg/g),富放射成因锶(~(87)Sr/~(86)Sr 0.709860~0.710362);而矿化后期结核状方解石碳同位素分布集中(δ~(13)C -7.0‰~-6.2‰),氧同位素(δ~(18)O 20.2‰~22.4‰)类似于沉积岩,在150~200℃时,据公式1000 ln α_(方解石)-水=4.01×10~6/T~2-4.66×10~3/T+1.71计算,与矿化后期结核状方解石平衡的流体的δ~(18)O _(流体)介于7.1‰~12.7‰之间,此外,结核状方解石 Sr 含量较高(Sr 240~817μg/g),富放射成因 Sr (~(87)Sr/~(86)Sr 0.710235~0.710347)。金属硫化物铅同位素(~(206)Pb/~(204)Pb 18.373~18.452,~(207)Pb/~(204)Pb 15.605~15.668,~(208)Pb/~(204)Pb 38.524~38.726)在铅演化图解上位于造山带演化线与上地壳演化线之间,变化范围类似于兰坪盆地上地壳沉积岩系和喜马拉雅期岩浆岩。综合分析认为,金顶铅锌矿至少存在两期热液矿化事件,主矿化期成矿流体主要来源于富含有机质的上三叠统三合洞组灰岩中的地层水,可能有深源组分的加入;矿化后期成矿流体系大气降水。成矿流体在盆地中迁移时与围岩(含膏岩)发生了强烈的水岩反应。成矿金属可能来源于上三叠统三合洞组灰岩和喜马拉雅期岩浆岩。 |
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其他语种文摘
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The Jinding Zn-Pb deposit in Yunnan Province, is the largest Zn-Pb deposit in China, and one of the world-class super-large deposits with Zn+Pb reserves more than 10 Mt. A systematic study of carbon, oxygen and strontium isotopes has been carried out on main mineralization vein calcites and post-mineralization nodule calcites. The main mineralization vein calcites show a large variation ofδ~(13)C (-23.0‰--2.6‰), indicating mixed carbon source of sedimentary organics and marine carbonates, with high δ~(18)O (22.1‰ - 23.5‰) similar to the sediments, and high Sr contents (163 - 1920 μg/g), as well as ~(87)Sr/~(86)Sr (0.709860 - 0.710362). The post-mineralization nodule calcites have homogeneous δ~(13)C (-7.0‰ - -6.2‰) and δ~(18)O (20.2‰ - 22.4‰), high contents of Sr (240 - 817 μg/g) and ~(87)Sr/~(86)Sr (0.710235 - 0.710347). Besides, the calculated δ~(18)O of the ore-forming fluid equilibrated with the post-mineralization nodule calcites, range from 7.1‰ to 12.7‰ at 150 -200℃by the equation 1000 lnαcalcite-water=4.01×10~6/T~2- 4.66×10~3/T+1.71 (Zheng, 1991). Pb isotopes in sulfides (~(206)Pb/~(204)Pb 18.373 - 18.452, ~(207)Pb/~(204)Pb 15.605 - 15.668, ~(208)Pb/~(204)Pb 38.524 - 38.726) plot between the line of orogenic Pb and the line of upper crustal Pb in Pb evolution diagram (Zartman and Doe, 1981), consistent with the Himalayan magmatisms and partially overlapping with the upper crustal sedimentary rocks in the Lanping basin. These indicate that there were at least two episodes of hydrothermal mineralization in Jinding. The ore-forming fluid at the main mineralization stage might be the formation water originating from organic-rich limestones of the Upper Triassic Sanhedong Formation, apart from some involvement of deep-sourced components, whereas the ore-forming fluid at the post-mineralization stage is dominated by meteoric water. During migrating in the basin, the ore-forming fluids reacted with wall rocks and acquired high contents of radiogenic ~(87)Sr. Metals were likely provided by the Upper Triassic Sanhedong Formation limestones and Himalayan igneous rocks. |
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来源
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地球化学
,2013,42(5):467-480 【核心库】
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关键词
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方解石
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碳
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氧
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锶同位素
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铅同位素
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金顶铅锌矿
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兰坪盆地
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地址
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1.
中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550002
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云南金鼎锌业有限公司, 云南, 兰坪, 671401
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0379-1726 |
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学科
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地质学 |
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基金
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国家973计划
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中国科学院知识创新工程重要方向项目
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文献收藏号
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CSCD:4958836
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参考文献 共
70
共4页
|
|
1.
薛春纪. 金顶铅锌矿床地质-地球化学.
矿床地质,2002,21(3):270-277
|
被引
51
次
|
|
|
|
|
2.
Xue Chunji. Jinding Pb-Zn deposit: Geology and geochemistry.
Mineral Deposits, (in Chinese with English abstract),2000,21(3):270-277
|
被引
1
次
|
|
|
|
|
3.
曾荣.
兰坪盆地流体大规模成矿过程-以金顶和白秧坪矿床为例,2007
|
被引
1
次
|
|
|
|
|
4.
王安建. 论云南兰坪金顶超大型铅锌矿床的成因.
地质学报,2009,83(1):43-54
|
被引
40
次
|
|
|
|
|
5.
施加辛. 兰坪金顶铅锌矿床的岩矿特征及成因.
云南地质,1983,2(3):179-195
|
被引
32
次
|
|
|
|
|
6.
白嘉芬. 云南金顶铅锌矿床地质特征及成因初探.
矿床地质,1985,5(1):1-9
|
被引
52
次
|
|
|
|
|
7.
吴淦国. 云南金顶铅锌矿床构造演化及矿化富集规律初探.
地球科学,1989,14(5):477-486
|
被引
34
次
|
|
|
|
|
8.
赵兴元. 云南金顶铅锌矿床成因研究.
地球科学,1989,14(5):523-530
|
被引
30
次
|
|
|
|
|
9.
覃功炯. 金顶铅锌矿床成因模式及找矿预测.
云南地质,1991,10(2):145-190
|
被引
56
次
|
|
|
|
|
10.
罗君烈.
滇西特提斯的演化及主要金属矿床成矿作用,1994:157-214
|
被引
5
次
|
|
|
|
|
11.
Hu Ruizhong. Helium and argon isotopic geochemistry of Jinding superlarge Pb-Zn deposit.
Sci China (D),1998,41(4):442-448
|
被引
19
次
|
|
|
|
|
12.
胡明安. 试论岩溶型铅锌矿床的成矿作用及其特点-以云南兰坪金顶矿床为例.
地球科学,1989,14(5):531-538
|
被引
20
次
|
|
|
|
|
13.
高广立. 论金顶铅锌矿床的地质问题.
地球科学,1989,14(5):467-476
|
被引
15
次
|
|
|
|
|
14.
尹汉辉. 云南兰坪-思茅地洼盆地演化的深部因素及幔-壳复合成矿作用.
大地构造与成矿学,1990,14(2):113-124
|
被引
49
次
|
|
|
|
|
15.
王京彬. 金顶超大型铅锌矿床REE地球化学研究.
地球化学,1991,20(4):359-365
|
被引
36
次
|
|
|
|
|
16.
Kyle J K. Jinding: A giant Tertiary sandstone-hosted Zn-Pb deposit, Yunnan, China.
SEG Newslett,2002(50):1,9-16
|
被引
1
次
|
|
|
|
|
17.
Xue Chunji. Geology and isotopic composition of helium, neon, xenon and metallogenic age of the Jinding and Baiyangping ore deposits, northwest Yunnan, China.
Sci China (D),2003,46(8):789-800
|
被引
29
次
|
|
|
|
|
18.
薛春纪. 兰坪金顶大规模成矿的流体过程--不同矿化阶段流体包裹体微量元素约束.
岩石学报,2006,22(4):1031-1039
|
被引
14
次
|
|
|
|
|
19.
薛春纪. 西南三江兰坪盆地大规模成矿的流体动力学过程——流体包裹体和盆地流体模拟证据.
地学前缘,2007,14(5):147-157
|
被引
23
次
|
|
|
|
|
20.
Brannon J C. Strontium isotopic constraints on the origin of ore-forming fluids of the Viburnum Trend, Southeast Missouri.
Geochim Cosmochim Acta,1991,55(5):1407-1419
|
被引
11
次
|
|
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|
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