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K-Ar Dating, Geochemical, and Sr-Nd-Pb Isotopic Systematics of Late Mesozoic Mafic Dikes, Southern Jiangxi Province, Southeast China: Petrogenesis and Tectonic Implications
Guiqing Xie;  Ruizhong Hu;  Jingwen Mao;  Franco Pirajno;  Ruiling Li;  Jinjian Cao;  Guohao Jiang;  Junhong Zhao
2006
Source PublicationInternational Geology Review
Volume48Issue:11Pages:1023–1051
Abstract

A geochemical and isotopic study was carried out on late Mesozoic mafic dikes in southern Jiangxi Province in order to clarify their petrogenesis and explore tectonic implications. K-Ar dating results show that these mafic dikes intruded during Jurassic to Late Cretaceous (147–79 Ma) time. Dominantly sub-alkaline in composition, these dikes share several geochemical features: they are significantly enriched in large-ion lithophile element (LILE, e.g., Rb, Ba, Sr) and slightly enriched in light rare-earth elements (LREE), and are variably depleted in high-field-strength elements (HFSE, e. g., Nb, Ta, Ti). However, mafic dikes intruded in the Late Jurassic to Early Cretaceous (147–139 Ma) are also characterized by weaker Nb and Ta negative anomalies compared with dikes intruded in the mid-Late Cretaceous (118–78 Ma). Age-corrected Sr-Nd isotopic ratios show relatively wide ranges for (87Sr/86Sr)i from 0.7042 to 0.7130 , and –10.8 to +5.9 for εNd(T). 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb ratios for these dikes range from 17.819 to 18.400, 15.472 to 15.730, and 37.711 to 38.787, respectively. Geological, geochemical, and isotopic evidence suggests that the mafic dikes in southern Jiangxi Province were not significantly affected by crustal contamination. We consider them to have originated from dominantly EM-2 type lithospheric mantle ± minor asthenospheric mantle (MORB or DMM). The geochemical and Sr-Nd-Pb isotopic characteristics of basalts and mafic dikes, together with geochemical and isotopic data from granitoids, volcanic rocks, and rift basins in Southeast China suggest that this region was dominated by a lithospheric extensional tectonic regime in the late Mesozoic. This study, integrated with published geochemical and isotopic data for upper Mesozoic and Cenozoic basaltic rocks, allows us to postulate that lithospheric thinning in Southeast China continued until the end of Late Cretaceous time, and was accompanied by a shift in the mantle sources of basaltic rocks.

Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8260
Collection矿床地球化学国家重点实验室
Affiliation1.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, China
2.Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037, China
3.Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China
4.Geological Survey of Western Australia, 100 Plain Street, Perth, WA 6004, Australia
Recommended Citation
GB/T 7714
Guiqing Xie;Ruizhong Hu;Jingwen Mao;Franco Pirajno;Ruiling Li;Jinjian Cao;Guohao Jiang;Junhong Zhao. K-Ar Dating, Geochemical, and Sr-Nd-Pb Isotopic Systematics of Late Mesozoic Mafic Dikes, Southern Jiangxi Province, Southeast China: Petrogenesis and Tectonic Implications[J]. International Geology Review,2006,48(11):1023–1051.
APA Guiqing Xie;Ruizhong Hu;Jingwen Mao;Franco Pirajno;Ruiling Li;Jinjian Cao;Guohao Jiang;Junhong Zhao.(2006).K-Ar Dating, Geochemical, and Sr-Nd-Pb Isotopic Systematics of Late Mesozoic Mafic Dikes, Southern Jiangxi Province, Southeast China: Petrogenesis and Tectonic Implications.International Geology Review,48(11),1023–1051.
MLA Guiqing Xie;Ruizhong Hu;Jingwen Mao;Franco Pirajno;Ruiling Li;Jinjian Cao;Guohao Jiang;Junhong Zhao."K-Ar Dating, Geochemical, and Sr-Nd-Pb Isotopic Systematics of Late Mesozoic Mafic Dikes, Southern Jiangxi Province, Southeast China: Petrogenesis and Tectonic Implications".International Geology Review 48.11(2006):1023–1051.
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