Multi-mineral geochronology reveals a protracted Mesoproterozoic tectonic and metallogenic link between southeastern Australia and Laurentia

IF 3.2 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Precambrian Research Pub Date : 2024-11-20 DOI:10.1016/j.precamres.2024.107619

Sheree Armistead , Sebastien Meffre , Ralph Bottrill , Andrew Cross , David Huston , Grace Cumming

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Abstract

Plate tectonic reconstructions place Laurentia and eastern Australia together during the Mesoproterozoic. Specifically, the Belt-Purcell Basin in the USA and Canada has been linked to the Rocky Cape Group in northwest Tasmania based on detrital zircon studies. The Belt-Purcell Basin is highly endowed in economic deposits of Cu, Pb, Zn, Ag and critical metals such as Co, formed during the Mesoproterozoic. The Rocky Cape Group of northwest Tasmania hosts several sediment-hosted Cu-Pb-Zn ± Co prospects, however they were previously thought to be Devonian in age. New laser ablation inductively-couple plasma mass spectroscopy (LA-ICP-MS) in situ U-Pb monazite, xenotime and apatite data, sensitive high resolution ion microprobe (SHRIMP) in-situ U-Pb monazite data, and LA-ICP-MS galena Pb isotope data were collected from these prospects. By using multiple minerals with different U–Pb closure temperatures, we have unravelled a complex and protracted history of thermal pulses in the Rocky Cape region associated with Cu-Pb-Zn ± Co mineralisation. These data indicate that primary sulphide mineralisation formed at c. 1350 Ma, with several resetting or remobilisation events recorded at c. 1250 Ma, c. 1100 Ma and c. 950 Ma. These ages are contemporaneous with previously published authigenic monazite and metamorphic monazite ages from the Rocky Cape Group. This suggests that mineralisation is broadly syn-sedimentary and related to the development of the basin into which the Rocky Cape Group was deposited. These new ages are similar to those of sediment-hosted ore deposits in the Belt-Purcell Basin in the USA and Canada, further supporting the proposed link between northwest Tasmania and North America during the Mesoproterozoic. The high metal endowment of age-equivalent rocks in the Belt-Purcell Basin, highlight the potential for new discoveries of base and critical metals in southeastern Australia.

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多矿物地质年代学揭示了澳大利亚东南部与劳伦提亚之间旷日持久的中新生代构造和金属生成联系

板块构造重建将劳伦提亚和澳大利亚东部在中新生代时期联系在一起。具体而言，根据锆英石碎屑研究，美国和加拿大的贝尔特-普塞尔盆地与塔斯马尼亚西北部的落矶角组有联系。贝尔特-普塞尔盆地蕴藏着丰富的铜、铅、锌、银和钴等重要金属的经济矿藏，这些矿藏形成于中新生代。塔斯马尼亚西北部的岩石角群（Rocky Cape Group）蕴藏着多个沉积矿床型铜铅锌±钴矿床，但以前认为它们的时代为泥盆纪。从这些矿区收集了新的激光烧蚀电感耦合等离子体质谱（LA-ICP-MS）原位铀-铅独居石、氙和磷灰石数据、灵敏高分辨离子微探针（SHRIMP）原位铀-铅独居石数据以及 LA-ICP-MS 方铅矿铅同位素数据。通过使用具有不同铀-铅闭合温度的多种矿物，我们揭示了落矶角地区与铜-铅-锌±钴矿化有关的复杂而漫长的热脉冲历史。这些数据表明，原生硫化物矿化形成于约 1350 Ma，在约 1250 Ma、约 1100 Ma 和约 950 Ma 发生了几次重置或再移动事件。这些年龄与之前公布的落矶角组自生独居石和变质独居石年龄同时。这表明矿化过程大致是同步沉积过程，与落矶角组所沉积的盆地的发展有关。这些新的年龄与美国和加拿大贝尔特-普塞尔盆地沉积矿床的年龄相似，进一步证实了塔斯马尼亚西北部与北美中新生代之间的联系。带状-普塞尔盆地中年龄相等的岩石具有很高的金属蕴藏量，这凸显了在澳大利亚东南部发现新的贱金属和临界金属的潜力。

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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.