世界级 Jundee 矿床金矿化的时间限制:对新元古代伊尔加恩克拉通造山金矿化偶发性质的启示

IF 3.2 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Precambrian Research Pub Date : 2024-07-04 DOI:10.1016/j.precamres.2024.107479
Sumail , Nicolas Thébaud , Quentin Masurel , Christopher M. Fisher , Hugh Smithies , Ravi Schreefel
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引用次数: 0

摘要

长期以来,人们一直假定世界范围内阿基坦环形山所蕴藏的成岩金矿床的成因模式是单一的、晚期成岩成矿事件。然而,最近的地质年代学发展及其在金矿床中的应用对这一传统观点提出了挑战,并表明在几个世界级的Archean系统中,金的赋存经历了不同的成矿阶段。在这里,我们展示了从西澳大利亚伊尔加恩克拉通世界级 Jundee 金矿床的成矿前、同步和成矿后侵入体中提取的火成锆石的 U-Pb 地球时序学数据。同步成矿灯泡岩获得的结晶年龄表明,金矿化发生在大约 2670 Ma,比该地区之前提出的金矿时期(大约 2640 - 2630 Ma)早大约 30 Ma。当与来自整个伊尔加恩克拉通地区其他主要金矿床的快速涌现的高质量地质年代数据相结合时,我们的研究结果突出表明,在约2675-2655Ma之间发生了早期的同步成矿事件,早于约2640-2630Ma的晚期成矿事件。我们的研究结果突显了在约 2675 - 2655 Ma 之间出现的早期同成因金矿化事件,它早于在整个卡尔古利地层发现的约 2640 - 2630 Ma 晚成因金矿化事件。这一较早的金矿化事件与伊尔加恩克拉通的新元古代卡尔古利造山运动同时发生,也与地幔岩浆活动(如灯石和萨努基托岩)的高峰期相吻合。较年轻的金事件与发生在约2640-2630Ma的伊尔加恩克拉通晚期至碰撞后演化过程中的壳内花岗岩柱状构造和变质高峰条件同时发生。对西澳大利亚的伊尔加恩克拉通和加拿大的苏必利尔克拉通进行比较后发现,两者都记录了在漫长的造山过程中发生的多次金事件。这项研究强调了构造过程在塑造这些古老克拉通金矿化的偶发性质方面的重要性。
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Temporal constraints on gold mineralisation at the world-class Jundee deposit: Insights into the episodic nature of orogenic gold mineralisation in the Neoarchean Yilgarn Craton

The proposed genetic model for orogenic gold deposits hosted in Archean cratons worldwide has long assumed a single, late-orogenic mineralisation event. Recent geochronological developments and their application to gold deposits, however, have challenged this conventional view and indicate that gold endowment in several world-class Archean systems developed over distinct mineralisation stages. Here, we present U-Pb geochronological data from igneous zircons extracted from pre-, syn-, and post-mineralisation intrusions from the world-class Jundee gold deposit in the Yilgarn Craton of Western Australia. The crystallisation age obtained for a syn-mineralisation lamprophyre indicates that gold mineralisation occurred at ca. 2670 Ma, which is ca. 30 Ma older than the previously proposed gold episode (ca. 2640 – 2630 Ma) for the region. When integrated with fast-emerging, high-quality geochronological data from other major gold deposits across the Yilgarn Craton, our results highlight the occurrence of an early, syn-orogenic mineralisation event between ca. 2675 – 2655 Ma, which pre-dated the ca. 2640 – 2630 Ma late-orogenic gold event identified across the Kalgoorlie Terrane. This older gold mineralisation event was concurrent with the onset of the Neoarchean Kalgoorlie Orogeny in the Yilgarn Craton, which also coincided with a peak in mantle-derived magmatism (e.g., lamprophyres and sanukitoids). The younger gold event was coeval with intra-crustal granite plutonism and peak metamorphic conditions that occurred during the late- to post-collisional evolution of the Yilgarn Craton at ca. 2640 – 2630 Ma. Comparison between the Yilgarn Craton in Western Australia and the Superior Craton in Canada demonstrates that both record multiple gold events that occurred during protracted orogenesis. This study underscores the importance of tectonic processes in shaping the episodic nature of gold mineralisation in these ancient cratons.

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来源期刊
Precambrian Research
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.
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