云南会泽铅锌矿田成矿物质来源：Pb、S、C、H、O、Sr同位素制约

李文博[1,2] 黄智龙 张冠

云南会泽铅锌矿田成矿物质来源：Pb、S、C、H、O、Sr同位素制约

李文博[1,2] 黄智龙张冠

- [1]北京大学造山带与地壳演化教育郜重点实验室,北京100871 [2]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,贵阳550002 [3]河南省地质调查院,郑州450007
基金项目:
本文得到国家自然科学基金项目（编号40502011,40372048和40425006）和中国博士后基金（编号2005037002）的资助. 致谢野外工作得到了云南会泽铅锌矿地质科同行的大力支持,蒋少涌、薛春纪、韩润生、陈衍景、赖勇等教授、李朝阳和许成研究员、祁进平博士等对论文初稿提出了许多宝贵修改意见,特此致谢!

收稿日期: 2006-03-02

修回日期: 2006-07-28

刊出日期: 2006-10-31

Sources of the ore metals of the Huize ore field in Yunnan province: constraints from Pb, S, C, H, O and Sr isotope geochemistry

LI Wenbo, HUANG Zhilong, ZHANG Guan

- 1. Laboratory of Crustal and Orogenic Evolution, Peking University, Beijing 100871, China; 2. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China; 3. Henan Institute of Geological Survey, Zhengzhou 450007, China

Received Date: 02 March 2006

Revised Date: 28 July 2006

Publish Date: 31 October 2006

摘要

摘要: 云南会泽铅锌矿田是我国著名的超大型特富铅锌矿田之一，由相距3公里的矿山厂和麒麟厂两个独立的矿床组成，Zn＋Pb金属量超过五百万吨，矿石品位在25%至35%之间。为确定矿床成矿流体和成矿金属来源，本文系统研究了矿床的Ph、S、C、O、H和Sr同位素组成特征。矿石硫化物的铅N位素组成均一，^206Pb／^204Pb，^207Pb／^204Pb和。^206Pb／^204Pb的变化范围分别为18．251～18．530，15．663～15．855和38.487～39．433，与围岩碳酸盐岩中浸染状黄铁矿一致，与碳酸盐地层相近，在^208Pb／^204Pb-^206Pb／^204Pb图上显示明显的线性关系，表明铅N位素组成相近的碳酸盐围岩地层提供了成矿物质。矿石硫化物的δ^14S变化范围为10．9‰～17．4‰，多数集中于13‰～17‰，表明还原硫主要来自地层中海相硫酸盐的还原，还原方式为热化学还原，下伏页岩、碎屑岩和泥质岩中的有机质在硫酸盐还原过程中发挥了重要作用。三种不同产状的脉石矿物方解石的碳氧同位素组成均一且没有明显差别，δ^13C变化范围为-2．1‰～-3．5‰, δ^18O为16.8‰～18．6‰。脉石矿物方解石中流体包裹体水的δDFI为-50‰～-60‰，取温度为200℃计算包裹体水的δ^18OH2O值为7．0‰～8.8‰。碳、氧和氢、氧同位素研究结果表明，成矿流体为来自下部上升的变质流体，由于下伏页岩、碎屑岩和泥质岩中有机质的参与，成矿流体具有低的δ^13C和δ^13DFI值，在上升过程中与围岩发生了同位素交换。矿石中黄铁矿、闪锌矿和方解石的初始锶同位素组成（^87Sr／^86Sr）．值的变化范围为0．714～0．717，赋矿围岩中未蚀变白云岩的初始锶同位素组成（^87Sr／^86Sr）．值为0.7083～0．7093，明显低于蚀变白云岩（0．7106），表明成矿流体具有高的（^87Sr／^86Sr），比值。相对围岩碳酸盐岩而言，下伏地层中的页岩、碎屑岩和泥质岩往往具有高得多的^87Sr／^86Sr，因此，流经或者起源于这些地层的流体具有高的锶同位素比值。
- 同位素地球化学 /
- 成矿流体 /
- 成矿物质 /
- 会泽铅锌矿田
- Isotope geochemistry /
- Ore fluid /
- Metal sources /
- Huize Zn-Pb ore field

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云南会泽铅锌矿田成矿物质来源：Pb、S、C、H、O、Sr同位素制约

Sources of the ore metals of the Huize ore field in Yunnan province: constraints from Pb, S, C, H, O and Sr isotope geochemistry

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