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Strontium isotopic geochemistry of Tianqiao Pb-Zn deposit, Southwest China
  • ISSN号:1000-9426
  • 期刊名称:Chinese Journal of Geochemistry
  • 时间:2014
  • 页码:131-137
  • 分类:P618.4[天文地球—矿床学;天文地球—地质学]
  • 作者机构:昆明理工大学国土资源工程学院,昆明650093
  • 相关基金:国家自然科学基金项目(41272111)
  • 相关项目:云南会泽超大型铅锌矿床锌同位素地球化学研究
中文摘要:

云南石屏热水塘铅锌矿床赋存于前震旦纪与震旦纪、寒武纪碳酸盐岩的不同层位中,矿体多呈层状、似层状、脉状和透镜状产出,矿石矿物组合以闪锌矿和方铅矿为主,脉石矿物以石英、方解石和白云石为主。脉石矿物方解石C、O同位素组成的研究表明,成矿流体中CO2的碳主要由海相碳酸盐岩溶解作用产生;δ34S的变化范围较大(-720‰ ~2797‰),表明成矿流体中的S可能为各时代碳酸盐地层的海相硫酸盐热化学还原的产物,少量硫可能有生物成因的硫参与;206Pb/204Pb、207Pb/204Pb、208Pb/204Pb变化范围分别为1743~18768、15441~15946、37061~38628,赋矿围岩和下伏地层均有可能提供了成矿物质,铅来源于上地壳和造山带,铅为多来源。铷锶同位素计算年龄为2059±33Ma,为印支晚期成矿年龄。综合各类地球化学信息,认为热水塘铅锌矿床形成工业矿床时间为印支晚期至燕山早期,即热水塘铅锌矿床是在印支运动强大的驱动力作用下促使成矿元素活化—混合—迁移—聚集成矿的。

英文摘要:

The Reshuitang Pb -Zn deposits is hosted in different layers of the Pre-sinian, Sinian and Cambrian carbonate rocks in Reshuitang Shiping, Yunnan. The ore bodies mainly occur as bedded, near bedded, nervations or lenticular. Ore minerals mainly behave in forms of filling action with minerals such as sphalerite, galena, whereas the gangue minerals are mainly quartz, calcite, and dolomite. Geochemical study shows that the background level of metallogenetic elements are several ten times higher than those in similar rocks. The compositions of calcite C, 0 isotopes show that the ore-forming fluids were mainly produced by dissolution of marine carbonate. The range of 534S values is relative large ( -7. ?27. 97%c),which shows that the sulfur in the ore-forming fluids werethe products of thermo-chemical sulfate reduction. The ratios of 206Pb/204Pb, 207Pb/204Pb, 208Pb/204Pb are 17.43 -18.768, 15.441 ~ 15. 946 and 37. 061 ? 38. 6 2 8, respectively. The host rocks and the underlying strata may have provided ore-forming material for mineralization and Pb has a variety of sources such as the upper crust and the orogenic belt. The Rb and Sr isotopic age are calculated to be 205. 9 ± 3. 3 Ma,a late Indosinian metallogenic age. The geochemical evidence suggests that the source for the ore-formation metals and fluids of the Reshuitang Pb-Zn deposits is a mixed product and the ore deposits were formed in the late Indosinian, and the ore deposit is a sedimentary reworked type of hydrothermal deposits.

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