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Zircon U–Pb age and Sr–Nd–Hf isotopic constraints on the age and origin of Triassic mafic dikes, Dalian area, Northeast China
Shen Liu; Ruizhong Hu; Shan Gao; Caixia Feng; Ian M. Coulson; Guangying Feng; Youqiang Qi; Yuhong Yang; Chaogui Yang; Liang Tang
2013
Source PublicationInternational Geology Review
Volume55Issue:2Pages:249-262
Other Abstract

Post-orogenic mafic rocks from Northeast China consist of swarms of dolerite dikes. We report a new U-Pb zircon age, as well as whole-rock geochemical and Sr-Nd-Hf isotopic data. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) U-Pb zircon analysis yielded an age of 210.3 +/- 1.5 million years (i.e. Triassic) for these mafic dikes. Most Dalian mafic rocks exhibit low K2O + Na2O contents, and span the border between alkaline and calc-alkaline rock associations in the total alkali-silica diagram. The investigated dikes are also characterized by relatively high (Sr-87/Sr-86)(i) ratios (0.7061-0.7067) and negative epsilon(Nd) (t) (-4.7 to -4.3) and epsilon(Hf) (t) values (-4.1 to -1.1), implying that they were derived from an enriched lithospheric mantle source. The mafic dikes are characterized by relatively low MgO (4.65-5.44 wt.%), Mg-# (41-44), and compatible element content [such as Cr (89.9-125 ppm) and Ni (56.7-72.2 ppm)], which are the features of an evolved mafic magma. No evidence supports the idea that the mafic rocks were affected by significant assimilation or crustal contamination during emplacement. We conclude that the dolerites formed in a post-orogenic extensional setting, related to lithospheric delamination or 'collapse' of the Central Asian Orogenic Belt (CAOB), also termed the Xingmeng Orogenic Belt in China.

KeywordPost-orogenic Triassic Magmatism Mafic Dikes Lithospheric Delamination Crustal Extension Northeast China
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/352002/5136
Collection矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文
矿床地球化学国家重点实验室
Recommended Citation
GB/T 7714
Shen Liu,Ruizhong Hu,Shan Gao,等. Zircon U–Pb age and Sr–Nd–Hf isotopic constraints on the age and origin of Triassic mafic dikes, Dalian area, Northeast China[J]. International Geology Review,2013,55(2):249-262.
APA Shen Liu.,Ruizhong Hu.,Shan Gao.,Caixia Feng.,Ian M. Coulson.,...&Liang Tang.(2013).Zircon U–Pb age and Sr–Nd–Hf isotopic constraints on the age and origin of Triassic mafic dikes, Dalian area, Northeast China.International Geology Review,55(2),249-262.
MLA Shen Liu,et al."Zircon U–Pb age and Sr–Nd–Hf isotopic constraints on the age and origin of Triassic mafic dikes, Dalian area, Northeast China".International Geology Review 55.2(2013):249-262.
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