Petrogenesis and relationship with REE mineralization of the quartz syenite from Chishan and Longbaoshan alkaline complex, southeastern North China Craton: Insights from zircon U-Pb geochronology, element, and Sr-Nd-Pb-Hf isotope geochemistry

被引：1

作者：

Wei, Pengfei ^{[1
]}

Li, Dapeng ^{[1
]}

Song, Zhigang ^{[1
,2
]}

Liu, Qiang ^{[1
]}

Geng, Ke ^{[1
]}

Zhang, Yan ^{[1
]}

Ding, Chengwu ^{[3
]}

Cai, Na ^{[1
]}

Li, Zengsheng ^{[1
]}

Zhang, Chao ^{[1
]}

Xie, Wei ^{[1
]}

机构：

[1] Minist Nat Resources, Shandong Inst Geol Sci, Key Lab Gold Mineralizat Proc & Resources Utilizat, Shandong Prov Key Lab Metallogen Geol Proc & Resou, Jinan, Peoples R China

[2] Shandong Univ Sci & Technol, Coll Earth Sci & Engn, Key Lab Deposit Mineralizat & Sedimentary Mineral, Qingdao, Peoples R China

[3] Shandong Univ Technol, Zibo, Peoples R China

来源：

FRONTIERS IN EARTH SCIENCE | 2023年 / 10卷

基金：

中国国家自然科学基金;

关键词：

zircon U-Pb dating; Sr-Nd-Pb isotope composition; alkaline complexes; enriched lithospheric mantle; REE mineralization; CRUST-MANTLE INTERACTION; IN-SITU ANALYSIS; LU-HF; MESOZOIC GRANITOIDS; GOLD DEPOSITS; LITHOSPHERIC MANTLE; CONTINENTAL BASALTS; JIAODONG TERRANE; INNER-MONGOLIA; VOLCANIC-ROCKS;

D O I：

10.3389/feart.2022.1046071

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Mesozoic alkaline complexes associated with the rare earth element (REE) mineralization are developed in southeastern North China Craton (NCC), and they recorded some important information about the lithospheric thinning and destruction of the NCC. Zircon U-Pb dating results reveal that syenitic rocks from the Chishan and Longbaoshan alkaline complexes were emplaced at ca. 126.2-123.7 Ma. These syenitic rocks have an arc-like affinity with enriched LREEs and LILEs (e.g., Ba and Th) and depleted HFSE (e.g., Nb and Ta). However, they plot within the extensional alkaline-calc-alkaline field in the lg (CaO/(K2O + Na2O)) versus SiO2 discrimination diagram and plot within the fields of the divergent plate and within-plate settings in the Nb-N versus Th-N discrimination diagram, implying an extensional tectonic setting. Thus, we suggest that the syenitic rocks should form in an extensional tectonic settings related to rollback and retreat of the subducting Paleo-Pacific plate. These syenitic rocks have similar Sr-Nd-Pb-Hf isotope compositions ((Sr-87/Sr-86)(i) = 0.7062 to 0.7101, epsilon(Nd)(t) = -8.2 to -15.0, epsilon(Hf)(t) = -13.5 to -9.6), which are the same as the enriched subcontinental lithospheric mantle (SCLM) of the NCC. Taking into account not only our new data but also previously published data regarding the evolution of NCC in the Mesozoic, we conclude that the syenitic rocks from the Chishan and Longbaoshan complexes are derived from partial melting of the lithospheric mantle triggered by the Paleo-Pacific plate subduction. Moreover, the geochemical and Sr-Nd-Pb isotopic similarity between the Chishan REE ores, Longbaoshan altered rocks, and the syenitic rocks implied that they are homologous products of Early Cretaceous and that the mineralization shows inheritance to the magmatic hydrothermal evolution.

引用

页数：21

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