Petrologic relationship between lamprophyres, carbonatites, and heavy rare‐earth element enriched breccias at Hicks Dome

IF 2.2 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Terra Nova Pub Date : 2024-03-26 DOI:10.1111/ter.12712

Jarek Trela, Jared T. Freiburg, Esteban Gazel, Laurence Nuelle, Anton H. Maria, David H. Malone, John M. Molinarolo

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Abstract

New petrological, geochemical, and P–T modelling results from igneous samples clarify how carbonatite‐lamprophyre magmatism, fluorite and rare earth element (REE) enrichment are petrogenetically related in southern Illinois. P–T modelling reveals that igneous rocks derive from a deep mantle carbonated source, that is consistent with trace element signatures for a fluorine‐rich transition zone origin. Major element systematics suggests liquid‐immiscibility with lamprophyric melts as the origin for Ca‐carbonatites. Heavy REE (HREE) enrichments in Hicks Dome breccias likely formed through preferential partitioning and transport of HREE by brine‐melts, exsolved from a deep carbonatite body. Brine‐melts redistributed HREEs throughout the system along brecciated pathways where they reprecipitated as HREE‐rich phosphate/fluorcarbonate minerals (e.g. xenotime, florencite, synchesite) in host bedrock. The diversity of igneous rocks in southern Illinois highlights the area as an excellent natural laboratory to study carbonated melt petrogenesis and evolution.

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希克斯穹顶的灯泡岩、碳酸盐岩和富含重稀土元素的角砾岩之间的岩石学关系

来自火成岩样本的新岩石学、地球化学和 P-T 模拟结果澄清了伊利诺伊州南部碳酸盐岩-amprophyre 岩浆作用、萤石和稀土元素（REE）富集在岩石学上的关系。P-T 模拟显示，火成岩来源于深地幔碳酸盐岩，这与富氟过渡带起源的微量元素特征相一致。主要元素系统学表明，钙碳酸盐岩的成因是与灯泡状熔体的液态不溶性。希克斯穹隆角砾岩中的重稀土元素（HREE）富集可能是通过从深部碳酸盐岩体中溶出的卤水熔体对 HREE 的优先分配和迁移形成的。卤水熔岩将 HREEs 沿角砾岩路径重新分配到整个系统中，并在主基岩中重新沉淀为富含 HREE 的磷酸盐/氟碳酸盐矿物（如霞石、萤石、辉绿岩）。伊利诺斯州南部火成岩的多样性突出表明，该地区是研究碳酸盐熔体成岩和演化的绝佳天然实验室。

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来源期刊

Terra Nova 地学-地球科学综合

CiteScore

4.80

自引率

8.30%

发文量

审稿时长

2.3 months

期刊介绍： Terra Nova publishes short, innovative and provocative papers of interest to a wide readership and covering the broadest spectrum of the Solid Earth and Planetary Sciences. Terra Nova encompasses geology, geophysics and geochemistry, and extends to the fluid envelopes (atmosphere, ocean, environment) whenever coupling with the Solid Earth is involved.