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Zircon U-Pb age, geochemical, and Sr-Nd isotopic constraints on the origin of Late Carboniferous mafic dykes of the North China Craton, Shanxi Province, China
Liu S(刘燊);  Feng CX(冯彩霞);  Jiang BM(江博明);  Hu RZ(胡瑞忠);  Zhai MG(翟明国);  Lai SC(赖绍聪)
2014
Source PublicationActa Petrologica Sinica
Volume30Issue:6Pages:1707-1717
Abstract

As the special result of lithospheiic extension, nowadays, the invistigation on geology and geochemistry of the mafic dykes (e.g., lamprophyre, dolerite, diabase porphyrite, etc.) has been given special attention. The mafic dykes mainly distribute in America, Canada, Brazil, Australian and China. In addition, the ages of these dykes are between 2.4Ga and 1.0Ga. At present, the Mesozoic and Cenozoic mafic in China were found in North China Craton (NCC), southern China, Tibet and Tarim basin. The studied mafic dykes came from Shanxi Province, northern NCC. Herein, we report U-Pb zircon ages, whole-rock geochemistry, and Sr-Nd isotopic data for representative samples of these dykes. Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) U-Pb analysis of zircons yielded a consistent Late Carboniferous (293. 4 +/- 1. 7Ma) age for one sample of the rocks analyzed during this study. Dolerites within the study area have a narrow range of compositions (SiO2 = 50. 78% similar to 51. 35%, TiO2 = 2. 16% similar to 2. 32%, Al2O3 = 14. 53% similar to 15. 08%, Fe2O3 = 12. 42% similar to 12. 66%, MnO = 0. 13% similar to 0. 16%, MgO = 5. 14% similar to 5. 35%, CaO = 7. 93% 8. 25%, Na2O =3.52% 3. 78%, K2O =1.01% similar to 1. 14%, and P2O5 =0.24% similar to 0. 36%). The dolerites are enriched in light rare earth elements (LREE), large ion lithophile elements (LILE; i.e., Ba, K, and Sr) and high field strength elements (Nb, Ta, and Zr), and depleted in Th, Pb, Nb, P, and Ti. These mafic dykes have relatively uniform (Sr-87/Sr-86)(i) values (0. 70422 similar to 0. 70423), positive epsilon(Nd) (t) values (5. 8 similar to 6. 1), and invariant neodymium model ages (t(DM1) = 0. 67 similar to 0. 72Ga, tp, 2 = 0. 57 similar to 0. 59Ga). These data suggest that these dykes formed from magmas derived from partial melting of a depleted asthenospheric mantle source that fractionated olivine, pyroxene, and Ti-bearing phases without assimilating significant amounts of crustal material. In summary, the generation and emplacement of mafic magmas in Shanxi Province, northern NCC can be attributed to post-subduction and collision (e. g., Paleo-Asian Ocean, Mongolia China Block) lithosphere extension.

KeywordJiaodong Peninsula Shandong Province Inner-mongolia South China Dike Swarms Petrogenesis Mantle Geochronology Lamprophyres Tectonics
Indexed ByEI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/9293
Collection矿床地球化学国家重点实验室
Affiliation1.NW Univ Xian, State Key Lab Continental Dynam, Xian 710069, Peoples R China
2.NW Univ Xian, Dept Geol, Xian 710069, Peoples R China
3.Natl Taiwan Univ, Dept Geosci, Taipei 10764, Taiwan
4.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China
Recommended Citation
GB/T 7714
刘燊;冯彩霞;江博明;胡瑞忠;翟明国;赖绍聪. Zircon U-Pb age, geochemical, and Sr-Nd isotopic constraints on the origin of Late Carboniferous mafic dykes of the North China Craton, Shanxi Province, China[J]. Acta Petrologica Sinica,2014,30(6):1707-1717.
APA 刘燊;冯彩霞;江博明;胡瑞忠;翟明国;赖绍聪.(2014).Zircon U-Pb age, geochemical, and Sr-Nd isotopic constraints on the origin of Late Carboniferous mafic dykes of the North China Craton, Shanxi Province, China.Acta Petrologica Sinica,30(6),1707-1717.
MLA 刘燊;冯彩霞;江博明;胡瑞忠;翟明国;赖绍聪."Zircon U-Pb age, geochemical, and Sr-Nd isotopic constraints on the origin of Late Carboniferous mafic dykes of the North China Craton, Shanxi Province, China".Acta Petrologica Sinica 30.6(2014):1707-1717.
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