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首页> 外文期刊>Economic Geology >The Geology and Metallogeny of Volcanic-Hosted Massive Sulfide Deposits: Variations through Geologic Time and with Tectonic Setting
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The Geology and Metallogeny of Volcanic-Hosted Massive Sulfide Deposits: Variations through Geologic Time and with Tectonic Setting

机译：火山岩质大块硫化物矿床的地质和成矿作用：地质时间和构造背景的变化

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摘要

Analysis of metallogenic data, including grade and tonnage, host-rock succession, ore and alteration mineralogy, and lead and sulfur isotope data, indicates significant secular changes in the character of volcanic-hosted massive sulfide (VHMS) deposits, which appear to be related to changes in tectonic processes, tectonic cycles, and changes in the composition of the hydrosphere and atmosphere. The distribution of these deposits, whether measured in number of deposits, tons of ore, or tons of metal, is episodic, with major peaks at 2740 to 2690, 1910 to 1840, 510 to 460, and 390 to 355 Ma. These peaks correspond to the assembly of major continental land masses, including Kenorland, Nuna, Gondwana, and Pangea, respectively. Periods when fewer VHMS deposits formed correspond to periods of supercontinent and/or supercraton stability. The VHMS deposits do not form during supercontinent and/or supercraton breakup; rather, these intervals are associated with deposition of clastic-dominated sediment-hosted zinc-lead deposits. The main exception to these generalizations is the amalgamation of Rodinia, which was not accompanied by significant VHMS formation. Rodinian amalgamation may have been dominated by advancing accretionary orogenesis, whereby the overriding plate did not go into extension. In this case, slab rollback and the associated extension to form back-arc basins would not have been common, a setting typically conducive to the formation and preservation of VHMS deposits.
机译：对成矿数据的分析，包括品位和吨位， 岩体演替，矿石和蚀变矿物学以及铅 和硫同位素数据，表明明显的长期变化 具有火山成因的块状硫化物（VHMS）矿床的特征， 似乎与构造过程的变化， 构造周期以及构造的变化有关水圈 和大气。这些矿床的分布，无论是 ，以矿床数量，矿石量还是金属吨数 来衡量，都是分布性的，主要峰值在2740至2690、1910至1840年， 510至460和390至355 Ma。这些峰值分别对应于主要大陆陆块的 集合，分别包括Kenorland， Nuna，冈瓦纳和Pangea。 VHMS沉积物形成的时期较少，对应于超大洲 和/或超克拉通稳定性的时期。在超大陆和/或超克拉通破裂期间，VHMS沉积物不会形成 ；相反，这些 间隔与碎屑占主导的 沉积物沉积的锌铅矿床的沉积有关。这些 概括的主要例外是Rodinia的合并，而 并没有明显的VHMS形成。 Rodinian合并 可能是由增生造山运动主导的，而上覆板没有扩展。在这种 情况下，板坯回滚和相关的扩展以形成后弧 盆地并不常见，该设置通常有利于地层 和保存VHMS沉积物。

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  • 来源
    《Economic Geology》 |2010年第3期|00000571-00000591|共21页
  • 作者

    David L. Huston; Sally Pehrsson; Bruce M. Eglington; Khin Zaw;

  • 作者单位

    Geoscience Australia, GPO Box 378, Canberra ACT 2601, Australia;

    Geological Survey of Canada, 601 Booth St, Ottawa, Ontario K1A 0E8, Canada;

    Saskatchewan Isotope Laboratory, University of Saskatchewan, 114 Science Place, Saskatoon, Saskatchewan S7N 5E2, Canada;

    CODES ARC Centre of Excellence in Ore Deposits, Private Bag 126, University of Tasmania, TAS 7001, Australia;

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