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The genesis of the Gayna River carbonate-hosted zinc-lead deposit.

机译:盖纳河碳酸盐岩型铅锌矿床的成因。

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摘要

Geochemical analyses on samples from the Mississippi Valley Type Gayna River deposit, Northwest Territories, Canada, have resulted in the definition of three ore stages and a deposit genesis model. Pb/Pb and Re/Os isotopic analyses indicate that the mineralization at Gayna River was emplaced during the Cretaceous -- Tertiary. The sphalerites at Gayna River contain at least 21 trace elements including abnormally high Ga concentrations. Trace elements and 87Sr/86Sr ratios, ranging up to 0.7219 in the ore stage, indicate that underlying shales were the source of metals. The main stage of mineralization resulted from a hot saline brine probably derived from evaporated seawater. Stable isotopes suggest that thermochemical sulphate reduction (TSR) of local gypsum was the source of main and late stage sulphide. Fluids circulating through shale units, by tectonically driven flow, reacted with local gypsum causing TSR and resulting in the deposition of Pb and Zn sulphides at Gayna River.
机译:对加拿大西北地区密西西比河谷类型盖纳河矿床的样品进行地球化学分析后,确定了三个矿石阶段和一个矿床成因模型。 Pb / Pb和Re / Os同位素分析表明,盖纳河的矿化发生在白垩纪-第三纪。盖纳河的闪锌矿至少含有21种微量元素,包括异常高的Ga浓度。矿石阶段的微量元素和87Sr / 86Sr比值最高达到0.7219,表明下层页岩是金属的来源。矿化的主要阶段是可能来自蒸发海水的热盐水盐水所致。稳定的同位素表明,局部石膏的热化学硫酸盐还原(TSR)是主要和后期硫化物的来源。在页岩单元中循环流动的流体,通过构造驱动流,与当地的石膏反应,引起TSR,并在盖纳河上沉积了铅和硫化锌。

著录项

  • 作者

    Wallace, Sara Rose Bronwen.;

  • 作者单位

    University of Alberta (Canada).;

  • 授予单位 University of Alberta (Canada).;
  • 学科 Geology.;Geochemistry.
  • 学位 M.Sc.
  • 年度 2009
  • 页码 126 p.
  • 总页数 126
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;地质学;
  • 关键词

  • 入库时间 2022-08-17 11:38:27

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