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首页> 外文期刊>Precambrian Research >Stratigraphy, structure and lode gold system at the Central Manitoba mine trend, Rice Lake greenstone belt, Archean Superior Province, Manitoba, Canada
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Stratigraphy, structure and lode gold system at the Central Manitoba mine trend, Rice Lake greenstone belt, Archean Superior Province, Manitoba, Canada

机译：曼尼托巴中部矿山趋势的地层，结构和金矿系统，莱斯湖绿岩带，太古宙斯优越省，加拿大曼尼托巴

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The Central Manitoba mine trend is one of the most important lode gold districts in the Rice Lake green-stone-granitoid belt of the western Uchi subprovince within western Superior Province, Manitoba, Canada. Neoarchean host rocks consist of a south-facing metavolcano-sedimentary succession (2.75-2.73 Ga) intruded by voluminous gabbroic sills and tonalitic-granodioritic plutons (2.73-2.72 Ga), as well as late aplite dikes (2.73-2.72 Ga) and quartz-feldspar porphyry dikes (2.73-2.71 Ga). Five generations (G(1)-G(5)) of deformation structures have been recognized through detailed geological mapping. The entire succession was folded during G(1) and G(2) prior to rare late aplite dike emplacement. All fault-fill veins and extension veins cut all lithologic units, and are structurally governed by late (G(3) and G(4)) conjugate shear zones. Main gold mineralization occurs within fault-fill veins hosted by west-trending steeply-dipping (G(4)) dextral brittle-ductile and ductile shear zones, which occur along or across contacts of metabasalt, metagreywacke and metagabbro or entirely within metagabbro. Microstructural and paragenetic analyses on main gold-bearing veins have revealed that gold is intimately associated with quartz, pyrrhotite and tellurobismuthite. Main gold introduction is interpreted to have taken place contemporaneously with pyrrhotite and tellurobismuthite deposition early during G(4) shearing. These results in structural and mineralogical aspects at the Central Manitoba mine trend provide new constraints on structural evolution and gold mineralization of the southeastern Rice Lake belt, and can be used to improve exploration models for gold deposits in Archean terranes. (C) 2016 Elsevier B.V. All rights reserved.
机译：曼尼托巴中部矿山趋势是加拿大曼尼托巴省西部优越省内西部乌奇省的赖斯湖绿宝石-类花岗岩带最重要的金矿区之一。新古宙主岩由向南的大火山沉积沉积（2.75-2.73 Ga）组成，由大量辉长岩基岩和tonalitic-granodioritic岩体（2.73-2.72 Ga）侵入，以及晚期岩浆脉（2.73-2.72 Ga）和石英侵入-长石斑岩堤防（2.73-2.71 Ga）。通过详细的地质制图已认识到变形结构的五代（G（1）-G（5））。整个演替过程在G（1）和G（2）之前被折叠，然后才进行罕见的后期石堤防安置。所有断层充填脉和延伸脉均切开所有岩性单元，并在构造上受晚期（G（3）和G（4））共轭剪切带控制。主要金矿化发生在断层充填脉内，该脉由东向陡倾（G（4））右旋脆性韧性和延展性剪切带所主导，它们沿着或跨越偏玄武岩，变灰质和变质层的接触或整个接触面发生，或完全在变质层之内。对主要含金矿脉的微观结构和共生分析表明，金与石英，黄铁矿和碲铋铋石密切相关。主要金的引入被解释为与G（4）剪切早期的黄铁矿和碲铋锰矿同时发生。这些在马尼托巴中部矿山趋势的结构和矿物学方面的研究结果为东南莱斯湖带的结构演化和金矿化提供了新的约束条件，并可用于改进太古宙地层金矿的勘探模型。 （C）2016 Elsevier B.V.保留所有权利。

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