滇西南翁孔坝铜多金属矿床热液蚀变分带及元素迁移规律
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本文为云南省万人计划“青年拔尖人才”项目(编号:YNWR- QNBJ- 2019- 157);云岭学者项目(编号:2014);云南省矿产资源预测与评价工程实验室项目(编号:2012);云南省、昆明理工大学创新团队项目联合资助的成果


Zonation of hydrothermal alteration and migration of elements in the Wengkongba copper—polymetallic deposit, southwestern Yunnan
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    摘要:

    翁孔坝铜多金属矿床是近年来滇西南地区新发现的矿床之一。尽管前人在区域内开展了大量的研究,但对该矿床却鲜有涉及,因其热液蚀变特征及其地球化学找矿标志不明,制约了该矿床的深部找矿勘查工作。笔者等在矿化—蚀变矿物组合研究的基础上,对矿区内典型纵向剖面中各蚀变带的样品开展了元素地球化学定量分析,采用质量平衡计算方法和热液蚀变指数定量分析手段,研究矿化蚀变带中元素迁移特征。结果表明,热液蚀变具有明显的垂向分带特征,可划分为强方解石化带、绿泥石化带和弱硅化带。其中,强方解石化与铜矿化密切相关,方解石化和绿泥石化与铅锌矿化密切相关;从玄武质安山岩(围岩)至强方解石化带,热液蚀变指数(AI)整体呈递增趋势(74.85%75.85%76.29%78.98%),指示蚀变强度逐渐增强。CaO的迁入率(4.03%0.66%15.20%)、Cu的迁入率(154×10-6124×10-6642×10-6)、TFe2O3+MgO的迁入率(-1.34%4.48%2.48%)和Pb的迁入率(-961×10-6795×10-64×10-6)整体上均呈正相关,反映出强方解石化和绿泥石化热液蚀变是该矿床的重要找矿标志。

    Abstract:

    The Wengkongba copper polymetallic deposit is one of the newly discovered deposits in southwestern Yunnan in recent years. Although a lot of studies have been carried out in this region, unfortunately, the hydrothermal alteration and its geochemical prospecting indicators of Wengkongba copper polymetallic deposit are poorly understood.Methods: In this paper, On the basis of fine mineralogy research, the element geochemical analysis was carried out on the samples of each alteration zone in the typical longitudinal profile of the mining area by ICP- MS method. The mass balance calculation and the quantitative calculation of hydrothermal alteration index methods were adopted to study the element migration characteristics in the mineralized alteration zone.Results: The results show that the hydrothermal alteration index (AI) increases gradually (74.85%75.85%76.29%78.98%) from the wall rock to the strong calcitization zone, indicating that the alteration intensity is gradually enhanced. The migration rate of CaO (4.03%0.66%15.20%) is positively correlated with the migration rate of Cu (154 ×10-6124 ×10-6642 ×10-6), and the migration rate of TFe2O3+MgO (-1.34%4.48%2.48%) and the migration rate of Pb (-961 ×10-6795 ×10-64 ×10-6) are also positively correlated.Conclusions: The Wengkongba copper—polymetallic deposit has obvious vertical zoning characteristics, which can be divided into the strong calcitization zone, the chloritization zone and the weak silicification zone. Among them, the strong calcitization is closely related to the copper mineralization, calcitization and chloritization are closely related to the lead mineralization, the strong calcitization and the chloritization hydrothermal alteration are important prospecting indicators of the deposit.

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曾淑明,韩润生,张艳,刘飞,王明志,吴子卓,田映天.2023.滇西南翁孔坝铜多金属矿床热液蚀变分带及元素迁移规律[J].地质论评,69(1):2023010001,[DOI].
ZENG Shuming, HAN Runsheng, ZHANG Yan, LIU Fei, WANG Mingzhi, WU Zizhuo, TIAN Yingtian.2023. Zonation of hydrothermal alteration and migration of elements in the Wengkongba copper—polymetallic deposit, southwestern Yunnan[J]. Geological Review,69(1):2023010001.

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  • 收稿日期:2022-07-21
  • 最后修改日期:2022-12-31
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  • 在线发布日期: 2023-01-20
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