Evidence for a Proterozoic carbonatite system in the Mount Isa Province, Australia

IF 3.2 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Precambrian Research Pub Date : 2025-04-01 DOI:10.1016/j.precamres.2025.107784

Alex Brown , Carl Spandler , Thomas G. Blenkinsop

引用次数: 0

Abstract

Carbonatites are indicators of mantle processes, and they are economically important because of their association with rare earth element (REE), niobium and base metal deposits. Carbonatites and their associated lithologies (i.e. the carbonatite system) have not previously been identified in eastern Australia. We describe veins of dolomite calcite carbonatite, fenites and antiskarn, glimmerite, and alkali pegmatite from the Tommy Creek Domain, of the Eastern Subprovince of the Mount Isa Province (NW Queensland), that constitute a carbonatite system. The system can be identified from field relationships, geochronology, zircon trace elements, and stable and radiogenic isotopes. The emplacement of the carbonatite system coincided temporarily and spatially with regional hydrothermal alteration at ca. 1650 Ma in the Eastern Subprovince, which also has mantle isotopic affinities and is located above the boundary between thin and thick continental lithosphere.

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澳大利亚伊萨山省元古代碳酸盐岩系统的证据

碳酸盐岩是地幔作用的指示物，由于其与稀土、铌和贱金属矿床的关联，在经济上具有重要意义。碳酸盐岩及其伴生岩性（即碳酸盐岩体系）以前在澳大利亚东部未被发现。我们描述了来自伊萨山省（西北昆士兰）东部亚省汤米溪域的白云岩、方解石碳酸岩、白云岩和反矽卡岩、闪辉岩和碱伟晶岩脉，它们构成了一个碳酸岩系统。该系统可以从野外关系、地质年代学、锆石微量元素、稳定同位素和放射性同位素等方面进行识别。该碳酸盐岩体系的侵位与东亚省约1650 Ma的区域性热液蚀变在时间和空间上重合，也具有地幔同位素亲和力，位于大陆薄厚岩石圈分界之上。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.