西澳大利亚西南部Yilgarn克拉通Katanning金矿麻粒岩相片麻岩套的岩石成因及年代学

IF 3.2 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Precambrian Research Pub Date : 2025-05-28 DOI:10.1016/j.precamres.2025.107803

Luke J. Heseldell , Nicholas E. Timms , Hugo K.H. Olierook , Thomas E. Smail , Chris Clark , Graham Conner , Sean Makin

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引用次数: 0

摘要

了解太古宙克拉通高变质阶序的形成，是模拟克拉通形成和演化的必要条件。在本研究中，我们对位于西澳大利亚Yilgarn克拉通西南部的1.28 Moz Au Katanning金矿床麻粒岩相主层序进行了详细的研究。为了阐明该麻粒岩相金矿床的性质，对其寄主片麻岩层序进行了详细的地球化学、岩石学和年代学研究，建立了其形成的成岩模式。卡坦宁金矿床成矿的高品位变质岩可划分为9大岩性组合。这些岩石被解释为类似于现代BADR序列的基性-长英质原岩，与弧后环境下的伸展岩浆作用相一致。锆石U-Pb定年结果显示，长英质片麻岩和镁质片麻岩的岩浆年龄分别为2711±4 Ma和2703±3 Ma，与伊尔甘克拉通西部太古宙晚期火山活动同期。4个样品的变质锆石U-Pb年龄总和为2651±2 Ma，解释为整个序列的变质峰条件为~ 700 ~ 900°C和~ 5 ~ 7 kbar。表明埋藏迅速（约30 Myr），最大沉积时代为变质片麻岩（2683±8 Ma）到麻粒岩相变质作用，可能暗示闭合弧后裂谷的反转。本研究提供了伊尔甘克拉通西南构造演化的区域背景，反映了太古宙克拉通中高等级变质作用的作用，并对大型麻粒岩相金矿床进行了罕见的详细研究。

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Petrogenesis and geochronology of the granulite facies gneissic suite hosting the Katanning Gold Deposit, Yilgarn Craton, Southwest Western Australia

Understanding the formation of high metamorphic grade sequences from Archean Cratons is necessary for modelling Craton formation and evolution. In this study, we undertake a detailed review of the 1.28 Moz Au Katanning Gold Deposit granulite-facies host sequence, located in the southwestern Yilgarn Craton, Western Australia. To elucidate the nature of this granulite-facies gold deposit, a detailed geochemical, petrographic, and geochronological investigation was undertaken of its host gneissic sequence to establish a petrogenetic model of its formation. The high-grade metamorphic rocks that host gold mineralisation at the Katanning Gold Deposit can be divided into nine major lithological associations. These rocks are interpreted as mafic to felsic protoliths resembling modern BADR sequences which is consistent with extensional magmatism in a back arc setting. Zircon U-Pb dating yielded magmatic ages of a felsic and mafic gneiss at 2711 ± 4 Ma and 2703 ± 3 Ma, respectively, which are contemporaneous with the latest Archean volcanic events in the western Yilgarn Craton. The U-Pb ages of metamorphic zircon across four samples yielded a combined age of 2651 ± 2 Ma, interpreted as the time of peak metamorphic conditions of ∼700–900 °C and ∼5–7 kbar for the entire sequence. Indicating rapid (c. 30 Myr) burial, marked by the maximum depositional age of a metasedimentary gneiss (2683 ± 8 Ma) to granulite facies metamorphism, potentially implicating inversion of a closed back arc rift. This study provides a regional context for tectonic evolution of the southwestern Yilgarn Craton, reflecting on the role of high-grade metamorphism in Archean Cratons, and serves as a rare, detailed investigation into a large granulite-facies gold deposit.

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来源期刊

Precambrian Research 地学-地球科学综合

CiteScore

7.20

自引率

28.90%

发文量

325

审稿时长

12 months

期刊介绍： Precambrian Research publishes studies on all aspects of the early stages of the composition, structure and evolution of the Earth and its planetary neighbours. With a focus on process-oriented and comparative studies, it covers, but is not restricted to, subjects such as: (1) Chemical, biological, biochemical and cosmochemical evolution; the origin of life; the evolution of the oceans and atmosphere; the early fossil record; palaeobiology; (2) Geochronology and isotope and elemental geochemistry; (3) Precambrian mineral deposits; (4) Geophysical aspects of the early Earth and Precambrian terrains; (5) Nature, formation and evolution of the Precambrian lithosphere and mantle including magmatic, depositional, metamorphic and tectonic processes. In addition, the editors particularly welcome integrated process-oriented studies that involve a combination of the above fields and comparative studies that demonstrate the effect of Precambrian evolution on Phanerozoic earth system processes. Regional and localised studies of Precambrian phenomena are considered appropriate only when the detail and quality allow illustration of a wider process, or when significant gaps in basic knowledge of a particular area can be filled.