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The genesis and significance of the Paleocene granitoids in the Riazhai Pb polymetallic deposit, southern Tibet
Xu Jing1,2; Li XiaoFeng1,2,3; Xu QingHong4; Liu YaoHui5
2019
Source PublicationACTA PETROLOGICA SINICA
ISSN1000-0569
Volume35Issue:11Pages:3529-3548
AbstractThe Riazhai Pb polymetallic deposit is located in the Miocene porphyry Cu-Mo-Au metallogenic belt in the southern Gangdese and contains various intrusions including granodiorite, porphyritic granite and quartz porphyry. The SHRIMP U-Pb zircon geochronology, major and trace elements, and Sr-Nd isotopic geochemistry of these magmatic rocks were performed to study the magmatic activity in the mining area and its genetic significance. The results show that granodiorite (62. 70 +/- 0. 78Ma), mafic microgranular enclave, porphyritic granite (60. 43 +/- 0. 86Ma), and quartz porphyry (60. 30 +/- 1. 20Ma) were the products of the Paleocene magmatism in the southern Gangdese belt, and they show the evolution from basic rocks to intermediate-acidic igneous rocks (SiO2 = 53. 43% similar to 76. 46%) . The contents of Na2O + K2O range from 4. 43% to 6. 88% and the values of A/CNK are restricted from 0. 90 to 1. 06, which indicate the characteristics of metaluminous to peraluminous, calc-alkaline to high-K calc-alkaline I-type granite. These rocks have Sigma REE varying from 98. 10 x 10 (-6) to 100. 8 x 10(-6), with relative enrichment of light rare earth elements. They also show obvious depletion of Nb, Ta, P, and Ti, suggesting that they have probably experienced the crystallization differentiation of rutile, ilmenite, and apatite during the magma evolution. Compared with granodiorite (delta Eu = 0. 80 similar to 0. 97), quartz porphyry (delta Eu = 0. 38) shows stronger negative Eu anomalies and depletion of P and Ti, suggesting further crystallization differentiation. The rocks have (Sr-87/ Sr-86), values of 0. 7046 similar to 0. 7056 and epsilon(Nd) (t) values of - 2. 9 similar to - 0. 2, which reveal that the granodiorite and mafic microgranular enclave magma was mainly derived from the partial melting of juvenile lower crust (approximately 50% similar to 60%) during the collision and Neo-Tethyan subduction slab rollback, and then went through the crystallization differentiation. Quartz porphyry has similar a magmatic source, but more added crustal components, which are presumed to be the products of further plagioclase or K-feldspar crystallization differentiation in the same magma chamber. Combined with the reported Paleocene Pb-Zn polymetallic deposits in the Gangdese belt, the southward extension of the Paleocene-Eocene magmatic mineralization in the northern Nyaingentanglha polymetallic metallogenic belt probably caused the Riazhai mineralization in the Miocene Gangdese porphyry Cu-Mo-Au metallogenic belt and thus we proposed the potential for Fe-Cu polymetallic mineralization in this belt.
KeywordSHRIMP U-Pb geochronology Sr-Nd isotopes Pb-Zn polymetallic deposit Riazhai deposit Tibet
DOI10.18654/1000-0569/2019.11.17
WOS KeywordS-TYPE GRANITES ; LHASA TERRANE ; U-PB ; GEOCHEMICAL CHARACTERISTICS ; VOLCANIC-ROCKS ; GANGDESE BELT ; SKARN DEPOSIT ; I-TYPE ; GEOCHRONOLOGY ; PETROGENESIS
Language英语
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000510188200017
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95689
Collection矿产资源研究院重点实验室
Corresponding AuthorLi XiaoFeng
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
4.Guilin Univ Technol, Coll Earth Sci, Guilin 541004, Peoples R China
5.Guilin Res Inst Geol Mineral Resources, Guilin 541004, Peoples R China
First Author AffilicationKey Laboratory of Mineral Resources, Chinese Academy of Sciences
Corresponding Author AffilicationKey Laboratory of Mineral Resources, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Xu Jing,Li XiaoFeng,Xu QingHong,et al. The genesis and significance of the Paleocene granitoids in the Riazhai Pb polymetallic deposit, southern Tibet[J]. ACTA PETROLOGICA SINICA,2019,35(11):3529-3548.
APA Xu Jing,Li XiaoFeng,Xu QingHong,&Liu YaoHui.(2019).The genesis and significance of the Paleocene granitoids in the Riazhai Pb polymetallic deposit, southern Tibet.ACTA PETROLOGICA SINICA,35(11),3529-3548.
MLA Xu Jing,et al."The genesis and significance of the Paleocene granitoids in the Riazhai Pb polymetallic deposit, southern Tibet".ACTA PETROLOGICA SINICA 35.11(2019):3529-3548.
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