| 陕西马元地区楠木树铅锌矿床成矿物质来源——来自氢、氧同位素和微量元素的制约 |
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| 引用本文： | 宋志娇,陈翠华,张燕,尹力,黎洪秩,黄小东.陕西马元地区楠木树铅锌矿床成矿物质来源——来自氢、氧同位素和微量元素的制约[J].矿床地质,2018,37(5):985-1000. |
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| 作者姓名： | 宋志娇 陈翠华 张燕 尹力 黎洪秩 黄小东 |
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| 作者单位： | 成都理工大学地球科学学院 |
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| 基金项目： | 本文得到国家自然科学基金项目（批准号：41372093）资助 |
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| 摘 要： | 为进一步探讨楠木树铅锌矿床的成矿物质来源,文章对矿床中的25件岩矿石样品进行了系统的微量元素分析,并对矿床中不同阶段的热液脉石矿物进行了包裹体测温和氢、氧同位素测试。结果表明,Pb、Zn等成矿元素在郭家坝组地层中明显富集,而基底变质岩中Pb、Zn元素的丰度明显低于地壳岩石圈丰度;与成矿元素密切相关的元素Ag、Cd、Ge、In在寒武系郭家坝组地层中富集,在基底岩石中亏损;矿石中Ag、Cd、Ge、In等元素的含量明显高于未矿化的围岩。元素迁移分析表明流体运移过程中成矿热液萃取了Zn、Pb及其密切相关的Ag、Cd、Ge、In等组分,使Zn、Pb等成矿组分进一步富集。氢、氧同位素组成显示,与铅锌矿密切相关的石英样品落入变质水范围内,且靠近有机水范围,晚期方解石样品向雨水线漂移,表明早期成矿流体可能来自于深部的盆地卤水,在向上运移的过程中流经富含有机质的地层或有有机流体的加入,晚期有大气降水和海水的加入。
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| 关 键 词： | 地球化学 物质来源 微量元素 同位素 铅锌矿床 陕西马元 |
| 收稿时间： | 2017/7/20 0:00:00 |
| 修稿时间： | 2018/6/4 0:00:00 |
Metallogenic sources of Nanmushu Pb-Zn deposit in Mayuan area, Shaanxi Province: Constraint from hydrogen and oxygen isotopes and trace elements |
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| SONG ZhiJiao,CHEN CuiHu,ZHANG Yan,YIN Li,LI HongZhi and HUANG XiaoDong.Metallogenic sources of Nanmushu Pb-Zn deposit in Mayuan area, Shaanxi Province: Constraint from hydrogen and oxygen isotopes and trace elements[J].Mineral Deposits,2018,37(5):985-1000. |
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| Authors: | SONG ZhiJiao CHEN CuiHu ZHANG Yan YIN Li LI HongZhi and HUANG XiaoDong |
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| Institution: | School of Earth Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan, China,School of Earth Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan, China,School of Earth Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan, China,School of Earth Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan, China,School of Earth Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan, China and School of Earth Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan, China |
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| Abstract: | In order to further explore the sources of ore-forming material of the Nanmushu Pb-Zn deposit, the authors carried out a systematic analysis of trace elements in 25 ores and surrounding rocks, and conducted inclusion temperature measurement and H and O isotope test of the hydrothermal gangue minerals of different stages. The results show that Pb and Zn are obviously concentrated in the Guojiaba Formation, that the abundance of Pb and Zn in the basement metamorphic rocks is lower than that of the crustal lithosphere, Ag, Cd, Ge and In which are closely related to ore-forming elements are concentrated in Cambrian Formation, and depleted in basement rocks, and that the values of Ag, Cd, Ge and In in ore are obviously higher than those in barren wall rock. An analysis of element migration shows that the ore-forming hydrothermal fluids extracted Zn, Pb, Ag, Cd, Ge and In during the fluid migration, with further enrichment of Zn and Pb. The H-O isotopic analyses show that the quartz samples closely related to Pb-Zn minerals fall into the range of metamorphic water and are near the organic water range, and the late calcite samples drift toward the rain line, indicating that the early ore-forming fluids might have come from the deep basin brine, which migrated through the rocks with more organic matter or had organic fluid addition during the upward migration process, with the addition of rainwater and seawater at the late stage. |
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| Keywords: | geochemistry material sources trace elements isotope lead-zinc deposit Mayuan in Shaanxi |
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