多相金富集是高品位金形成的关键过程:10 Moz Jundee-Bogada营地(西澳大利亚伊尔加恩克拉通)的启示

IF 4.4 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Mineralium Deposita Pub Date : 2024-05-31 DOI:10.1007/s00126-024-01274-3
Sumail, Nicolas Thébaud, Quentin Masurel, Laura Petrella, Peter le Roux, Chris Stott
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引用次数: 0

摘要

成因金矿床中的高品位(> 10 g/t)金矿化具有重要的经济意义。了解这种富集矿带的形成对金勘探的成功至关重要。世界级的 Jundee-Bogada 金矿区位于西澳大利亚的 Yilgarn 克拉顿,由高品位(平均每吨 10 克,Jundee 矿床)和低品位(平均每吨 3 克,Bogada 探矿区)矿床组成,尽管有共同的寄主地层。为 Jundee 金矿床建立的准成因框架表明,金矿的整体禀赋是在三次变形过程中形成的。早期的低品位金矿化与延伸变形过程中形成的胶状壳状矿脉(DJB2A)有关。转为横断变形(DJB2B)后,胶结-壳状矿脉发生了角砾化,并同时沉积了原生金。晚期逆断层记录了东北-西南方向缩短(DJB3)导致的第三个成矿阶段的证据。这一晚期阶段的矿化主要是低品位的,局部出现了超高品位矿带(> 100 g/t)。每个事件都记录了在跨越局部变形历史的持续热液活动期间流体化学的瞬时变化。我们认为,在 Jundee 金矿床,三次多相成矿过程中长期的金富集导致了高品位金矿石的形成。Jundee金矿床记录了完整的成矿历史,而Bogada探矿区内的金仅在晚期收缩阶段(DJB3)被引入,从而形成了大量的低品位赋存。我们假设,高品位造山型金矿床中金的富集是长期成矿事件空间叠加的直接结果。
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Polyphased gold enrichment as a key process for high-grade gold formation: Insights from the 10 Moz Jundee-Bogada camp (Yilgarn Craton, Western Australia)

High-grade (> 10 g/t) gold mineralization in orogenic gold deposits is of significant economic importance. Understanding the formation of such enriched ore zones is critical for gold exploration success. The world-class Jundee-Bogada gold camp in the Yilgarn Craton of Western Australia comprises both high-grade (avg. > 10 g/t, Jundee deposit) and low-grade (avg. < 3 g/t, Bogada prospect) lodes, despite shared host stratigraphy. The paragenetic framework established for the Jundee gold deposit suggests that the overall gold endowment developed over three deformation events. An early episode of low-grade gold mineralization is associated with colloform-crustiform veins that formed during extensional deformation (DJB2A). A switch to transtensional deformation (DJB2B) resulted in brecciation of the colloform-crustiform veins and coeval deposition of native gold. Late reverse faults record evidence for a third mineralization stage resulting from a NE-SW-directed shortening (DJB3). Mineralization during this late stage was dominantly low-grade, with local occurrences of ultra-high-grade ore zones (> 100 g/t). Each event records transient changes in fluid chemistry during continued hydrothermal activity that spanned local deformation histories. We argue that at the Jundee gold deposit, protracted gold enrichment during three polyphased mineralization episodes resulted in the formation of high-grade gold ores. Whereas the complete metallogenic history is recorded at the Jundee deposit, gold within the Bogada prospect was introduced solely during the late contractional stage (DJB3), resulting in a bulk low-grade endowment. We hypothesize that gold enrichment in high-grade orogenic gold deposits is a direct consequence of the spatial superimposition of protracted ore-forming events.

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来源期刊
Mineralium Deposita
Mineralium Deposita 地学-地球化学与地球物理
CiteScore
11.00
自引率
6.20%
发文量
61
审稿时长
6 months
期刊介绍: The journal Mineralium Deposita introduces new observations, principles, and interpretations from the field of economic geology, including nonmetallic mineral deposits, experimental and applied geochemistry, with emphasis on mineral deposits. It offers short and comprehensive articles, review papers, brief original papers, scientific discussions and news, as well as reports on meetings of importance to mineral research. The emphasis is on high-quality content and form for all articles and on international coverage of subject matter.
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