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The magmatic-hydrothermal transition at Timbarra: Implications for the genesis of intrusion-related gold deposits

机译:Timbarra的Magmatic-Hymothermal过渡:对入侵相关金矿床的成因的影响

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The Timbarra gold deposit is hosted entirely within the granite core of a zoned pluton and is conformably constrained beneath the fine-grained carapace and internal layers. The ore is characterized by Au-Bi-Te-As-Mo-Sb geochemistry hosted within moderately oxidized I-type granite suggesting that Timbarra is part of the newly recognized intrusion-related gold deposit class. Despite a spatial-temporal link to magma-tism and a lithophile-enriched ore association characteristic of many granite-related systems, a magmatic origin for this deposit class is the still subject of much debate. The presence of magmatic-hydrothermal transition textures including miarolitic cavities, interconnected miarolitic textures, unidirectional solidification textures, pegmatites and vein-dykes combined with melt inclusion-fluid inclusion relationships provide compelling evidence for a magmatic origin for the low salinity CO_2-rich fluids that formed the deposit. The formation of the Timbarra gold deposit from low salinity CO_2-rich magmatic fluids at mesozonal levels (5 to 10 km) and 1.3 to 2.6 kbars pressure is consistent with the CO_2-rich nature of deeper intrusion-related gold, tin-tungsten and molybdenum systems as well as experimental data. Timbarra represents the first documentation of the magmatic-hydrothermal transition relationships within gold-only systems and has major implications for the future interpretation of fluid sources of such deposits.
机译:Timbarra金矿床完全托管在划分型芦苇的花岗岩核心内,并恰当地约束细粒甲壳和内层。矿石的特征在于Au-Bi-Te-Mo-Sb地球化学,在适度氧化的I型花岗岩内托管,表明Timbarra是新公认的入侵相关金沉积类的一部分。尽管有许多花岗岩相关系统的岩石 - TISM和富含型矿石矿石关联特征的空间链接,但该存款课的岩石起源是仍有多大辩论的主题。包括MiaLoLitic空腔的岩浆 - 水热过渡纹理,相互连接的MiArolity纹理,单向凝固纹理,PEGMATITE和静脉染料与熔融夹杂物流体包裹关系相结合,为形成的低盐度CO_2的富含液体提供令人信服的证据存款。在中沸水平(5至10km)的低盐度CO_2的岩浆液中形成Timbarra金矿床和1.3至2.6 kbars压力是与更深层次的入侵相关金,钨和钼的CO_2丰富的性质一致系统以及实验数据。 Timbarra代表了岩岩 - 水热转换关系的第一文件,在唯一的金色系统中,对未来对这种沉积物的流体来源的解释具有重大影响。

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