The effect of fluorine on mineral-carbonatitic melt partitioning of trace elements - Implications for critical mineral deposits

doi:10.1016/j.gca.2024.06.028

	The effect of fluorine on mineral-carbonatitic melt partitioning of trace elements - Implications for critical mineral deposits
	Xue, Shuo 1,2,3; Dasgupta, Rajdeep 3; Ling, Ming-Xing 4; Sun, Weidong5,6,7 ; Lee, Cin-Ty A.
	2024-08-15
发表期刊	GEOCHIMICA ET COSMOCHIMICA ACTA
ISSN	0016-7037
卷号	379 页码:53-75
通讯作者	Xue, Shuo([email protected])
摘要	Natural carbonatite is associated with various types of deposits, including rare earth elements (REEs) and highfield strength elements (e.g., Nb). Although the spatial relationship between fluorine enrichment and the formation of carbonatite-type deposits is well-established, the underlying mechanism remains unclear. In this study, we investigate the influence of fluorine on the partitioning of trace elements in carbonatite melts (CM) from the mantle to the crust. Elemental partitioning experiments were conducted at 3 GPa and 1100-1400 degrees C, both with and without fluorine. We determined trace element partition coefficients for the mineral-carbonatitic melt pairs involving the following minerals: clinopyroxene, olivine, spinel, perovskite, magnetite, calcite solid solution, magnesio w & uuml;stite. The addition of fluorine influences the types and stability of Ti-rich oxides. Fluorine-bearing systems crystallize magnetite, while fluorine-free systems crystallize perovskite. Compared to fluorine-free compositions, systems with 1.55-2.40 wt% fluorine in the melt exhibited significantly lower (clinopyroxene, spinel, olivine)-melt partition coefficients for REEs and HFSEs by half to one order of magnitude. The decreased uptake of these elements by clinopyroxene, spinel, and olivine may be attributed to changes in their speciation within the melt phase, consistent with the formation of REE-F complexes. Using our partition coefficients, we simulated the differences in trace element characteristics between carbonatite melts derived from the mantle under fluorine-bearing and fluorine-free conditions. The fluorine-bearing carbonatitic melt extracted from mantle peridotite displayed significantly higher trace element compositions compared to fluorine-free carbonatitic melt, with trace element concentrations being 5-10 times higher. We simulated the trace element characteristics of carbonatitic melts released from subducted sediments and ocean crusts and found that these ocean crusts or sediments can release fluorine-rich carbonatite melts that are naturally enriched in REE due to their high fluorine and REE contents. Therefore, the subduction of sediments or the recycling of ocean crusts is highly favorable for the formation of carbonatite-hosted REE deposits. This can explain why the majority of carbonatitehosted REE deposits are typically found in continental margins with subducted materials signals in source region. Furthermore, we modeled the impact of different mineral crystallization and fractionation in the shallow crust on the trace element compositions of carbonatitic melts. Late-stage magma crystallization and differentiation of silicate and carbonate minerals are favorable for the further enrichment of ore-forming materials (e.g., REEs).
关键词	Carbonatite REEs Mineral-melt partition coefficients Fluorine Fractional crystallization Experimental petrology
DOI	10.1016/j.gca.2024.06.028
收录类别	SCI
语种	英语
资助项目	US National Science Foundation[EAR -1763226]; Packard Fellowship for Science and Engineering; National Key R & D Program of China[2021YFC2901705]; Jiangxi Double Thousand Plan[DHSQT22021005]; National Natural Science Foundation of China[42173024]
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:001266284400001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS关键词	DEEP SULFUR CYCLE ; UPPER-MANTLE ; PHASE-RELATIONS ; SUBDUCTION ZONES ; REE DEPOSIT ; BAYAN OBO ; MAGMATIC DIFFERENTIATION ; LIQUID IMMISCIBILITY ; PERIDOTITE MINERALS ; OLDOINYO-LENGAI
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/186357
专题	深海极端环境与生命过程研究中心
通讯作者	Xue, Shuo
作者单位	1.Chinese Acad Sci, CAS Key Lab Mineral & Metallogeny, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 2.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 3.Rice Univ, Dept Earth Environm & Planetary Sci, MS 126,6100 Main St, Houston, TX 77005 USA 4.East China Univ Technol, State Key Lab Nucl Resources & Environm, Nanchang 330013, Peoples R China 5.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China 6.Laoshan Lab, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China 7.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Xue, Shuo,Dasgupta, Rajdeep,Ling, Ming-Xing,et al. The effect of fluorine on mineral-carbonatitic melt partitioning of trace elements - Implications for critical mineral deposits[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2024,379:53-75.
APA	Xue, Shuo,Dasgupta, Rajdeep,Ling, Ming-Xing,Sun, Weidong,&Lee, Cin-Ty A..(2024).The effect of fluorine on mineral-carbonatitic melt partitioning of trace elements - Implications for critical mineral deposits.GEOCHIMICA ET COSMOCHIMICA ACTA,379,53-75.
MLA	Xue, Shuo,et al."The effect of fluorine on mineral-carbonatitic melt partitioning of trace elements - Implications for critical mineral deposits".GEOCHIMICA ET COSMOCHIMICA ACTA 379(2024):53-75.