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Zircon U–Pb geochronological, geochemical, and Sr–Nd isotope data for Early Cretaceous mafic dykes in the Tancheng–Lujiang Fault area of the Shandong Province, China: Constraints on the timing of magm
Shen Liu;  Caixia Feng;  Ruizhong Hu;  Mingguo Zhai;  han Gao;  Shaocong Lai;   Jun Yan;  Ian M. Coulson;  Haibo Zou
2015
Source PublicationJournal of Asian Earth Sciences
Volume98Pages:247-260
Abstract

The timing and source of magmatism that formed Early Cretaceous dolerite dykes in the Tancheng–Lujiang (Tan–Lu) Fault area of the southeastern North China Craton was determined using geochronological, geochemical, and whole-rock Sr–Nd isotopic data. Laser ablation–inductively coupled plasma–mass (LA–ICP–MS) spectrometry U–Pb analysis of zircon yielded consistent ages of 129.6 ± 0.7, 126.8 ± 0.7, 125.5 ± 0.7, 124.9 ± 0.9, 126.4 ± 0.7, and 125.5 ± 0.7 Ma for six samples of the mafic dykes within the NCC. The K2O + Na2O concentrations (5.02–5.21 wt.%) of the dykes indicate they are alkaline and these dykes have K2O concentrations (2.35–2.48 wt.%) that indicate they are shoshonitic. These dolerites are also characterized by high and wide ranging (La/Yb)N (14.5–36.0), have slightly negative Eu anomalies (δEu = 0.70–0.91) and positive Ba, U, K, and Pb anomalies, and are depleted in the high field strength elements (Nb, Ta, P, and Ti). In addition, these mafic dykes are characterized by high radiogenic Sr [(87Sr/86Sr)i = 0.7099–0.7100] and negative εNd (t) values (−14.4 to −13.7). These data suggest that the magmas that formed the dykes were derived through the partial melting (12.0–15.0%) of an enriched region of the mantle that was hybridized during interaction with subducted sedimentary rocks from the Yangtze Craton. The parental magmas then fractionated olivine and Fe–Ti oxides during ascent and underwent negligible crustal contamination during magma emplacement. These mafic magmas were finally emplaced as dyke swarms associated with lithospheric extension.

KeywordAge origin hybridization tan–lu Fault ncc yangtze Craton
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/9543
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.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
3.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
4.Solid Earth Studies Laboratory, Department of Geology, University of Regina, Regina, Saskatchewan S4S 0A2, Canada
5.Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
Recommended Citation
GB/T 7714
Shen Liu;Caixia Feng;Ruizhong Hu;Mingguo Zhai;han Gao;Shaocong Lai; Jun Yan;Ian M. Coulson;Haibo Zou. Zircon U–Pb geochronological, geochemical, and Sr–Nd isotope data for Early Cretaceous mafic dykes in the Tancheng–Lujiang Fault area of the Shandong Province, China: Constraints on the timing of magm[J]. Journal of Asian Earth Sciences,2015,98:247-260.
APA Shen Liu;Caixia Feng;Ruizhong Hu;Mingguo Zhai;han Gao;Shaocong Lai; Jun Yan;Ian M. Coulson;Haibo Zou.(2015).Zircon U–Pb geochronological, geochemical, and Sr–Nd isotope data for Early Cretaceous mafic dykes in the Tancheng–Lujiang Fault area of the Shandong Province, China: Constraints on the timing of magm.Journal of Asian Earth Sciences,98,247-260.
MLA Shen Liu;Caixia Feng;Ruizhong Hu;Mingguo Zhai;han Gao;Shaocong Lai; Jun Yan;Ian M. Coulson;Haibo Zou."Zircon U–Pb geochronological, geochemical, and Sr–Nd isotope data for Early Cretaceous mafic dykes in the Tancheng–Lujiang Fault area of the Shandong Province, China: Constraints on the timing of magm".Journal of Asian Earth Sciences 98(2015):247-260.
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