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Geochemical, Sr–Nd isotopic, and zircon U–Pb geochronological constraints on the petrogenesis of Late Paleoproterozoic mafic dykes within the northern North China Craton, Shanxi Province, China
Shen Liu;  Caixia Feng;  Bor-ming Jahn;  Ruizhong Hu;  Shan Gao d, Guangying Fenge, Shaocong Lai;  Yuhong Yang;  Youqiang Qi;  Ian M. Coulson
2013
Source PublicationPrecambrian Research
Volume236Pages:182-192
Abstract

The ages and source of Precambrian mafic dolerite dykes of the North China Craton (NCC) were determined using geochronological, geochemical, and whole-rock Sr–Nd isotopic data. Laser ablation–inductively coupled plasma-mass spectrometry (LA–ICP-MS) U–Pb analysis of zircons yielded consistent ages of 1621 ± 6 and 1621 ± 7 Ma for two mafic dykes (SYG01 and SYG02) within the NCC. The dykes are classified as the sub-alkaline series according to their K2O + Na2O concentrations (2.5–2.9 wt%), and as the calc-alkaline series according to their K2O concentrations (0.05–0.72 wt%). These dykes also contain low concentrations of the light rare earth elements [(La/Yb)N = 1.5–2.4], with negligible Eu anomalies (δEu = 0.9–1.1), positive Ba, Pb, and K anomalies, and depletions in Th, U, and high field strength elements (P and Ti). In addition, the dykes contain relatively low amounts of radiogenic Sr[(87Sr/86Sr)i = 0.7025–0.7035] and have high ɛNd(t) values (5.6–5.8). These data suggest that the dykes were derived from a depleted mantle source that was hybridized during interaction with foundered lower crustal material. The parental mafic magmas underwent the fractionation of olivine, pyroxene, hornblende, and Fe–Ti oxides (e.g. rutile, ilmenite, titanite) during ascent, with negligible evidence for crustal contamination prior to emplacement at a high crustal level. The NCC extension was related to foundering of lower crust, and there were three episodes of lithosphere extension during Proterozoic time (i.e. 1.8–1.6 Ga, 1.3–1.2 Ga, and 0.8–0.7 Ga).

KeywordPaleoproterozoic Mafic Dykes Origin Extension Northern Ncc
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/9398
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.Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
6.Solid Earth Studies Laboratory, Department of Geology, University of Regina, Regina, Saskatchewan S4S 0A2, Canada
Recommended Citation
GB/T 7714
Shen Liu;Caixia Feng;Bor-ming Jahn;Ruizhong Hu;Shan Gao d, Guangying Fenge, Shaocong Lai;Yuhong Yang;Youqiang Qi;Ian M. Coulson. Geochemical, Sr–Nd isotopic, and zircon U–Pb geochronological constraints on the petrogenesis of Late Paleoproterozoic mafic dykes within the northern North China Craton, Shanxi Province, China[J]. Precambrian Research,2013,236:182-192.
APA Shen Liu;Caixia Feng;Bor-ming Jahn;Ruizhong Hu;Shan Gao d, Guangying Fenge, Shaocong Lai;Yuhong Yang;Youqiang Qi;Ian M. Coulson.(2013).Geochemical, Sr–Nd isotopic, and zircon U–Pb geochronological constraints on the petrogenesis of Late Paleoproterozoic mafic dykes within the northern North China Craton, Shanxi Province, China.Precambrian Research,236,182-192.
MLA Shen Liu;Caixia Feng;Bor-ming Jahn;Ruizhong Hu;Shan Gao d, Guangying Fenge, Shaocong Lai;Yuhong Yang;Youqiang Qi;Ian M. Coulson."Geochemical, Sr–Nd isotopic, and zircon U–Pb geochronological constraints on the petrogenesis of Late Paleoproterozoic mafic dykes within the northern North China Craton, Shanxi Province, China".Precambrian Research 236(2013):182-192.
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