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| Geochemical Characteristics and Petrogenesis of the REE-barren Huangyangshan Alkaline Intrusion in the South Qinling, Central China and the Comparative Study to the REE Mineralized Intrusions: Implication for the Regional REE Mineralization |
| ZHA Zhi-hui1,2, CHEN Wei1,2*, ZHANG Wei1, MA Rong-lin1,2 |
1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences,Guiyang 550081, China;
2. University of Chinese Academy of Sciences,Beijing 100049, China |
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Abstract The key factors controlling obviously different degrees of REE mineralization (fertile and barren) among a series of Silurian alkaline intrusions distributed in the South Qinling orogenic belt have long been poorly understood. In this paper, we have conducted a combined petrological, geochemical, and isotopic investigation of the REE-barren Huangyangshan alkaline pluton, in order to make a comprehensive comparison with REE-mineralized intrusions (the Miaoya and Shaxiongdong) and then to explore the reason why there is obvious difference among those intrusions in terms of the REE mineralization. Our results show that rocks (syenite and alkaline granite) of the Huangyangshan intrusion, which was formed in 438.8±3.7 Ma, have peralkaline, shoshonitic and high-K calc-alkaline characteristics. They have right-declined (LREE-rich) chondrite-normalized REE distribution patterns with negative Eu anomalies, obvious depletion of Eu, Ba, and Sr but weak HSFEs anomalies in the primitive mantle-normalized trace-elemental spider diagrams, and have high Zr and Nb contents, high Ga/Al ratios, and high zircon saturation temperatures (~830 ℃). They are similar to the typical A-type granite. The Huangyangshan alkaline rocks have εNd(t) values of 2.31~3.43 which are similar to those of the contemporaneous mantle-derived mafic rocks in the region. In combination with related geochemical features of these rocks, it is constrained that their parental magmas could be derived from partial melting of juvenile crustal mafic rocks. They are different from the contemporaneous REE-mineralized syenite which was derived from enrich mantle (EM I). The comparison of barren and mineralized intrusions show that they were derived from different magma sources. Thus, it is believed that the different magma sources of different alkaline intrusions in the South Qinling orogenic belt could be key factors resulting in their different geochemical characteristics and different properties of the REE mineralization.
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Received: 01 March 2022
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