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Geochronology and geochemistry of Early Silurian felsic volcanic rocks in the Dabaoshan ore district, South China: Implications for the petrogenesis and geodynamic setting

文献类型：期刊论文

作者Su, Shiqiang1,2,3; Qin, Kezhang2,3,4; Li, Guangming2,4; Pang, Xuyong2,3; Zou, Xinyu2,3; Zhao, Chao2,3
刊名GEOLOGICAL JOURNAL
出版日期2019-11-01
卷号54期号:6页码:3286-3303
关键词Early Paleozoic volcanic rocks Sr-Nd-Hf Stratiform Cu-Pb-Zn mineralization The Dabaoshan polymetallic deposit Zircon U-Pb geochronology
ISSN号0072-1050
DOI10.1002/gj.3328
英文摘要The Early Paleozoic orogeny in South China has remained controversial in the long run with debate over intracontinental orogeny versus plate subduction. Limited studies have focused on the Early Paleozoic volcanic rocks in South China, which is crucial for us to understand the tectonic evolution of the South China Block. The Dabaoshan Fe-Cu-Pb-Zn-Mo-W orefield, one of the largest polymetallic deposits in South China, is hosted by Paleozoic volcanic-sedimentary rocks and Mesozoic granitic porphyry. In this study, zircon U-Pb dating yielded ages of 439.4 +/- 2.7 Ma, 439.3 +/- 3.2 Ma, and 442.0 +/- 2.2 Ma for the Dabaoshan dacite. These ages are all in good agreement within errors and indicate that the dacite formed during the early Silurian (ca. 440 Ma). The dacites are slightly peraluminous, calc-alkaline with relatively high K2O + Na2O, FeOt, TiO2, CaO/Na2O ratios, and small negative Eu anomalies. They show enrichment in LILEs and LREE and depletion in Ba, Nb, Sr, P, and Ti. It has high initial Sr-87/Sr-86 values (0.70983-0.71140) and negative epsilon(Nd)(t) values ranging from -7.6 to -10 with T-2DM ages of 1.80-1.99 Ga, epsilon(Hf)(t) values from -4.95 to -15.48 with T-2DM ages of 1.72 Ga to 2.38 Ga. The overlapped Nd-Hf two-stage model ages range from 1.89 Ga to 1.99 Ga, which indicates that the Dabaoshan dacite originated from a Paleoproterozoic source. Combining these geochemical and in situ zircon Hf isotopic data, we propose that the Dabaoshan dacite may have originated from the partial melting of mixed source of Paleoproterozoic metasedimentary and metaigneous rocks as a result of underplating of mafic magma during the post-orogenic collapse and extension followed by lithospheric thining and asthenospheric mantle upwelling in an intraplate setting. Based on field observation and the geochronology results, we propose that the stratiform Cu-Pb-Zn mineralization may be related with the early Silurian volcanic rocks.
WOS关键词LA-ICP-MS ; NORTHERN GUANGDONG PROVINCE ; PB ZIRCON GEOCHRONOLOGY ; ND ISOTOPIC COMPOSITION ; EARLY PALEOZOIC OROGEN ; PORPHYRY MO DEPOSIT ; IN-SITU ANALYSIS ; S-TYPE GRANITES ; U-PB ; CATHAYSIA BLOCK
资助项目Society of Economic Geologist Foundation ; Geological Survey of China[12120115035401]
WOS研究方向Geology
语种英语
WOS记录号WOS:000496020400007
出版者WILEY
资助机构Society of Economic Geologist Foundation ; Society of Economic Geologist Foundation ; Society of Economic Geologist Foundation ; Society of Economic Geologist Foundation ; Geological Survey of China ; Geological Survey of China ; Geological Survey of China ; Geological Survey of China ; Society of Economic Geologist Foundation ; Society of Economic Geologist Foundation ; Society of Economic Geologist Foundation ; Society of Economic Geologist Foundation ; Geological Survey of China ; Geological Survey of China ; Geological Survey of China ; Geological Survey of China ; Society of Economic Geologist Foundation ; Society of Economic Geologist Foundation ; Society of Economic Geologist Foundation ; Society of Economic Geologist Foundation ; Geological Survey of China ; Geological Survey of China ; Geological Survey of China ; Geological Survey of China ; Society of Economic Geologist Foundation ; Society of Economic Geologist Foundation ; Society of Economic Geologist Foundation ; Society of Economic Geologist Foundation ; Geological Survey of China ; Geological Survey of China ; Geological Survey of China ; Geological Survey of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/95704]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Qin, Kezhang
作者单位1.Univ Tasmania, ARC Ctr Excellent Ore Deposits Codes, Sch Phys Sci, Hobart, Tas 7001, Australia
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Beijing, Peoples R China
4.Chinese Acad Sci, Inst Earth Sci, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Su, Shiqiang,Qin, Kezhang,Li, Guangming,et al. Geochronology and geochemistry of Early Silurian felsic volcanic rocks in the Dabaoshan ore district, South China: Implications for the petrogenesis and geodynamic setting[J]. GEOLOGICAL JOURNAL,2019,54(6):3286-3303.
APA Su, Shiqiang,Qin, Kezhang,Li, Guangming,Pang, Xuyong,Zou, Xinyu,&Zhao, Chao.(2019).Geochronology and geochemistry of Early Silurian felsic volcanic rocks in the Dabaoshan ore district, South China: Implications for the petrogenesis and geodynamic setting.GEOLOGICAL JOURNAL,54(6),3286-3303.
MLA Su, Shiqiang,et al."Geochronology and geochemistry of Early Silurian felsic volcanic rocks in the Dabaoshan ore district, South China: Implications for the petrogenesis and geodynamic setting".GEOLOGICAL JOURNAL 54.6(2019):3286-3303.

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来源：地质与地球物理研究所

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