Liquid immiscibility acting on the formation of the Miaoya carbonatite-syenite complex in the South Qinling Belt, Central China

doi:10.1016/j.jseaes.2024.106072

	Liquid immiscibility acting on the formation of the Miaoya carbonatite-syenite complex in the South Qinling Belt, Central China
	Xia, Yu-hong 1; Lai, Shao-cong 1; Yang, Hang 1; Zhu, Yu 1; Qin, Jiang-feng 1; Zhu, Ren-zhi 1; Liu, Min 1; Zhang, Fang-yi 2; Zhong, Zhe-hao 1
	2024-04-01
发表期刊	JOURNAL OF ASIAN EARTH SCIENCES
ISSN	1367-9120
卷号	264 页码:11
通讯作者	Lai, Shao-cong(shaocong@nwu.edu.cn)
摘要	As one of the largest carbonatite-syenite complexes enriched in rare earth elements (REE) in China, the magmahydrothermal processes of the Miaoya carbonatite-syenite complex (MCSC) are of great significance with respect to the enrichment of REE, and have therefore attracted much attention. Although the hydrothermal mineralization process of the Miaoya carbonatite-associated REE deposits has been well addressed, studies concerning its detailed magmatic process remain relatively limited. Here, we present new zircon U-Pb age, whole-rock major and trace element, and Sr-Nd-Pb isotope composition data of the MCSC, to help provide a comprehensive understanding of its source characteristics and related liquid immiscibility process. The Miaoya syenites studied here formed at 410.8 +/- 1.9 Ma, consistent with the formation ages of alkaline rocks (377-455 Ma) in the South Qinling Belt. Both samples in the MCSC share homogeneous Sr-Nd-Pb isotopes (i.e., carbonatites: 87Sr/86Sr(i) = 0.70361-0.70366, epsilon Nd(t) = +2.6-+2.8, 206Pb/204Pb = 17.81-18.13, 207Pb/204Pb = 15.51-15.53, and 208Pb/204Pb = 37.67-38.27; syenites: 87Sr/86Sr(i) = 0.70286-0.70524, epsilon Nd(t) = +2.0-+2.6, 206Pb/204Pb = 18.33-18.83, 207Pb/204Pb = 15.55-15.57, and 208Pb/204Pb = 37.88-38.38), suggesting a common enriched mantle source. The plagioclase identified in the carbonatites and the calcite observed in the syenites fully support the interaction between carbonate and silicate melts during the liquid immiscibility process. Similar to the liquid immiscibility experimental results, the Miaoya carbonatites are more enriched in Ca, Mn, Sr, and REE than the syenites, but are more depleted in Na, K, Al, Si, and high field strength elements, such as Nb, Ta, Zr, and Hf, further demonstrating that liquid immiscibility provided a crucial contribution to the formation of the MCSC. In combination with typical REE-rich carbonatite-alkaline complexes (e.g., the Mianning-Dechang carbonatiteassociated REE deposit belt of the western Yangtze Block, South China, and the Mountain Pass carbonatiteassociated REE deposits of California, USA), we propose that the enriched mantle and the liquid immiscibility are significant for the REE enrichment of carbonatite-alkaline complexes.
关键词	South Qinling Belt Miaoya carbonatite-syenite complex Enriched mantle Liquid immiscibility REE enrichment
DOI	10.1016/j.jseaes.2024.106072
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[42172056] ; National Natural Science Foundation of China[41772052] ; National Natural Science Foundation of China[42202048] ; Young Talent Fund of Association for Science and Technology in Shaanxi, China[20230706]
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001188642900001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS关键词	NEOPROTEROZOIC TECTONIC EVOLUTION ; TRACE-ELEMENT COMPOSITION ; PB ZIRCON AGE ; ISOTOPIC CHARACTERISTICS ; PHASE-RELATIONS ; SILICATE ROCKS ; MOUNTAIN PASS ; MANTLE SOURCE ; ORIGIN ; ALKALINE
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/185005
专题	深海极端环境与生命过程研究中心
通讯作者	Lai, Shao-cong
作者单位	1.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China 2.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China
推荐引用方式 GB/T 7714	Xia, Yu-hong,Lai, Shao-cong,Yang, Hang,et al. Liquid immiscibility acting on the formation of the Miaoya carbonatite-syenite complex in the South Qinling Belt, Central China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2024,264:11.
APA	Xia, Yu-hong.,Lai, Shao-cong.,Yang, Hang.,Zhu, Yu.,Qin, Jiang-feng.,...&Zhong, Zhe-hao.(2024).Liquid immiscibility acting on the formation of the Miaoya carbonatite-syenite complex in the South Qinling Belt, Central China.JOURNAL OF ASIAN EARTH SCIENCES,264,11.
MLA	Xia, Yu-hong,et al."Liquid immiscibility acting on the formation of the Miaoya carbonatite-syenite complex in the South Qinling Belt, Central China".JOURNAL OF ASIAN EARTH SCIENCES 264(2024):11.