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Geochemical, Sr–Nd–Pb isotope, and zircon U–Pb geochronological constraints on the origin of Early Permian mafic dikes, northern North China Craton
Shen Liu;  Caixia Feng;  Bor-ming Jahn;  Ruizhong Hu;  Shan Gao;  Ian M. Coulson;  Guangying Feng;  Shaocong Lai;  Yuhong Yang;  Liang Tang
2013
Source PublicationInternational Geology Review
Volume55Issue:13Pages:1626–1640
Abstract

Dolerite dike swarms are widespread across the North China Craton (NCC) of Hebei Province (China) and Inner Mongolia. Here, we report new geochemical, Sr–Nd–Pb isotope, and U–Pb zircon ages for representative samples of these dikes. Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) U–Pb analysis yielded consistent Permian ages of 274.8 ± 2.9 and 275.0 ± 4.5 Ma for zircons extracted from two dikes. The dolerites have highly variable compositions (SiO2 = 46.99–56.18 wt.%, TiO2 = 1.27–2.39 wt.%, Al2O3 = 14.42–16.20 wt.%, MgO = 5.18–7.75 wt.%, Fe2O3 = 8.03–13.52 wt.%, CaO = 5.18–9.75 wt.%, Na2O = 2.46–3.79 wt.%, K2O = 0.26–2.35 wt.%, and P2O5 = 0.18–0.37 wt.%) and are light rare earth element (LREE) and large ion lithophile element (LILE, e.g. Rb, Ba, and K, and Pb in sample SXG1-9) enriched, and Th and high field strength element (HFSE, e.g. Nb and Ta in sample SXG1-9, and Ti) depleted. The mafic dikes have relatively uniform (87Sr/86Sr)i values from 0.7031 to 0.7048, (206Pb/204Pb)i from 17.77 to 17.976, (207Pb/204Pb)i from 15.50 to 15.52, (208Pb/204Pb)i from 37.95 to 38.03, and positive εNd(t) (3.6–7.3), and variable neodymium model ages (TDM1 = 0.75–0.99 Ga, TDM2 = 0.34–0.74 Ga). These data suggest that the dike magmas were derived from partial melting of a depleted region of the asthenospheric mantle, and that they fractionated olivine, pyroxene, plagioclase, K-feldspar, and Ti-bearing phases without undergoing significant crustal contamination. These mafic dikes within the NCC formed during a period of crustal thinning in response to extension after Permian collision between the NCC and the Siberian Block.

KeywordPermian Mafic Dikes Dolerite Origin Northern Ncc Siberian Block
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8248
Collection矿床地球化学国家重点实验室
Affiliation1.State Key Laboratory of Continental Dynamics and Department of Geology, Northwest University, Xi’an, 710069, PR China
2.Department of Geosciences, National Taiwan University, Taipei, Taiwan
3.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, PR China
4.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, PR China
5.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, PR China
6.Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, PR China Published online: 10 Apr 2013
Recommended Citation
GB/T 7714
Shen Liu;Caixia Feng;Bor-ming Jahn;Ruizhong Hu;Shan Gao;Ian M. Coulson;Guangying Feng;Shaocong Lai;Yuhong Yang;Liang Tang. Geochemical, Sr–Nd–Pb isotope, and zircon U–Pb geochronological constraints on the origin of Early Permian mafic dikes, northern North China Craton[J]. International Geology Review,2013,55(13):1626–1640.
APA Shen Liu;Caixia Feng;Bor-ming Jahn;Ruizhong Hu;Shan Gao;Ian M. Coulson;Guangying Feng;Shaocong Lai;Yuhong Yang;Liang Tang.(2013).Geochemical, Sr–Nd–Pb isotope, and zircon U–Pb geochronological constraints on the origin of Early Permian mafic dikes, northern North China Craton.International Geology Review,55(13),1626–1640.
MLA Shen Liu;Caixia Feng;Bor-ming Jahn;Ruizhong Hu;Shan Gao;Ian M. Coulson;Guangying Feng;Shaocong Lai;Yuhong Yang;Liang Tang."Geochemical, Sr–Nd–Pb isotope, and zircon U–Pb geochronological constraints on the origin of Early Permian mafic dikes, northern North China Craton".International Geology Review 55.13(2013):1626–1640.
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