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Zircon U–Pb age, geochemical, and Sr–Nd–Hf isotopic constraints on the origin of mafic dykes in the Shaanxi Province, North China Craton, China
Shen Liu;  Caixia Feng;  Bor-ming Jahn;  Ruizhong Hu;  Shan Gao;  Ian M. Coulson;  Guangying Feng;  Shaocong Lai;   Chaogui Yang;  Yuhong Yang
2013
Source PublicationLithos
Volume175–176Pages:244-254
Abstract

Mafic dolerite dykes form a series of swarms that are widespread across the North China Craton (NCC). We present U–Pb zircon ages, geochemical data, and Sr–Nd–Hf isotopic data for representative samples of the Shaanxi dolerite dykes in the southern NCC. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) U–Pb zircon analyses for three samples yield ages ranging from 448.1 ± 1.2 to 489.6 ± 0.9 Ma (i.e., Cambro-Ordovician). The dolerites are characterised by a wide range of rock compositions. They display enrichments in light rare earth element (LREEs) and large ion lithophile element (LILE) (i.e., Ba, U, K and Pb), as well as depletion in high field strength (HFSE) (Nb, Ta, Hf and Ti). The mafic dykes have relatively uniform (87Sr/86Sr)i ranging from 0.7049 to 0.7076, (176Hf/177Hf)i from 0.282187 to 0.282236, low εNd (t) values, from − 4.1 to − 4.9, εHf (t) values of between − 7.9 and − 9.8, for zircon, and high hafnium model ages (TDM1 = 1366–1535 Ma, TDM2 = 1924–2081 Ma). These results suggest that the dykes are derived by partial melting of an enriched, lithospheric mantle source. The magmas underwent fractionation of olivine, pyroxene, plagioclase, and Ti-bearing phases (rutile, ilmenite, titanite), along with crustal contamination. The formation of the Shaanxi Province, NCC mafic dykes can be attributed to the collision between the NCC and south Qinling Block. Specifically, these magmas formed as a result of crustal thinning in response to extension that followed this collision.

KeywordPalaeozoic Mafic Dykes Petrogenesis Shaanxi Province Ncc
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/9406
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, 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, China
4.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
5.Solid Earth Studies Laboratory, Department of Geology, University of Regina, Regina, Saskatchewan S4S 0A2, Canada
6.Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
Recommended Citation
GB/T 7714
Shen Liu;Caixia Feng;Bor-ming Jahn;Ruizhong Hu;Shan Gao;Ian M. Coulson;Guangying Feng;Shaocong Lai; Chaogui Yang;Yuhong Yang. Zircon U–Pb age, geochemical, and Sr–Nd–Hf isotopic constraints on the origin of mafic dykes in the Shaanxi Province, North China Craton, China[J]. Lithos,2013,175–176:244-254.
APA Shen Liu;Caixia Feng;Bor-ming Jahn;Ruizhong Hu;Shan Gao;Ian M. Coulson;Guangying Feng;Shaocong Lai; Chaogui Yang;Yuhong Yang.(2013).Zircon U–Pb age, geochemical, and Sr–Nd–Hf isotopic constraints on the origin of mafic dykes in the Shaanxi Province, North China Craton, China.Lithos,175–176,244-254.
MLA Shen Liu;Caixia Feng;Bor-ming Jahn;Ruizhong Hu;Shan Gao;Ian M. Coulson;Guangying Feng;Shaocong Lai; Chaogui Yang;Yuhong Yang."Zircon U–Pb age, geochemical, and Sr–Nd–Hf isotopic constraints on the origin of mafic dykes in the Shaanxi Province, North China Craton, China".Lithos 175–176(2013):244-254.
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