Zircon U-Pb-Hf Isotopes and Geochemistry of Mo-bearing Granite Porphyry in the Lower Urgen Mo Deposit: Implications for the Late Mesozoic Porphyry Mo and Cu Mineralization in the Northern and Central Great Xing’an Range, NE China

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Wei Xie, Guangliang Zhang, Chao Jin, Qingdong Zeng, Shouqin Wen, Lingli Zhou, Tieqiao Tang, Pengcheng Ma, Hui Wang, Kailun Zhang
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引用次数: 0

Abstract

The Lower Urgen deposit is a newly discovered porphyry Mo deposit in the northern and central Great Xing’an Range. Mineralization predominantly occurs within granite porphyry, yielding a zircon U-Pb age of 142.3 ± 1.5 Ma, thereby endorsing an Early Cretaceous Mo mineralization event. Zircon εHf(T) values (5.5–7.7) and T(DM2-st) (707–844 Ma) suggest that the granite porphyry originated from the partial melting of the Neoproterozoic lower crust. These granite porphyries exhibit coherent geochemical signatures with regional Late Mesozoic Mo-causative granites. Classified as highly fractionated A-type granites, they are enriched in Rb, Th, U, and K, and depleted in Ba, Sr, P, Ti, and Eu. Notably, they possess higher Rb/Sr and Rb/Ba ratios, and lower (La/Yb)N, Eu/Eu*, LREE/HREE, K/Rb, and Zr/Hf ratios than coeval Cu-causative granites, implying the extent of fractional crystallization plays a pivotal role in determining the mineralization styles (Mo- versus Cu-dominant). Two possible tectonic models are proposed. In one model, Late Jurassic Mo- and Cu-causative granites were formed in an intra-plate extensional setting and compressional setting induced by the flat-slab subduction of the Mongol-Okhotsk Ocean (MOO) plate, respectively, while Early Cretaceous Mo-causative granites were formed in a post-collision extensional setting following the final closure of the MOO. The post-orogenic lithospheric extension model related to the closure of the MOO provides another plausible explanation for the origin of the ore-causative granites. Early Cretaceous highly fractionated A-type granites and Late Jurassic low fractionated adakitic granites represent potential targets for future exploration of Mo- and Cu-dominant porphyry deposits, respectively.

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来源期刊
Petrology
Petrology 地学-地球科学综合
CiteScore
2.40
自引率
20.00%
发文量
27
审稿时长
>12 weeks
期刊介绍: Petrology is a journal of magmatic, metamorphic, and experimental petrology, mineralogy, and geochemistry. The journal offers comprehensive information on all multidisciplinary aspects of theoretical, experimental, and applied petrology. By giving special consideration to studies on the petrography of different regions of the former Soviet Union, Petrology provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.
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