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Geochemical and isotopic constraints on the age and origin of mafic dikes from eastern Shandong Province, eastern North China Craton
Shen Liu; Ruizhong Hu; Shan Gao; Caixia Feng; Guangying Feng; Youqiang Qi; Ian M. Coulson; Yuhong Yang; Chaogui Yang; Liang Tang
2012
发表期刊International Geology Review
卷号54期号:12页码:1389-1400
摘要

Post-orogenic mafic dikes are widespread across eastern Shandong Province, North China Craton, eastern China. We here report new U-Pb zircon ages and bulk-rock geochemical and Sr-Nd-Pb isotopic data for representative samples of these rocks. LA-ICP-MS U-Pb zircon analysis of two mafic dike samples yields consistent ages of 118.7 +/- 0.25 million years and 122.4 +/- 0.21 million years. These Mesozoic mafic dikes are characterized by high (Sr-87/Sr-86)(i) ranging from 0.7082 to 0.7087, low epsilon(Nd)(t) values from -17.0 to -17.5, Pb-206/Pb-204 from 17.14 to 17.18, Pb-207/Pb-204 from 15.44 to 15.55, and Pb-208/Pb-204 from 37.47 to 38.20. Our results suggest that the parental magmas of these dikes were derived from an ancient, enriched lithospheric mantle source that was metasomatized by foundered lower crustal eclogitic materials prior to magma generation. The mafic dikes underwent minor fractionation during ascent and negligible crustal contamination. Combined with previous studies, these findings provide additional evidence that intense lithospheric thinning beneath eastern Shandong occurred at similar to 120 Ma, and that this condition was caused by the removal/foundering of the lithospheric mantle and lower crust.

学科领域矿床地球化学
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/352002/4816
专题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
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GB/T 7714
Shen Liu,Ruizhong Hu,Shan Gao,et al. Geochemical and isotopic constraints on the age and origin of mafic dikes from eastern Shandong Province, eastern North China Craton[J]. International Geology Review,2012,54(12):1389-1400.
APA Shen Liu.,Ruizhong Hu.,Shan Gao.,Caixia Feng.,Guangying Feng.,...&Liang Tang.(2012).Geochemical and isotopic constraints on the age and origin of mafic dikes from eastern Shandong Province, eastern North China Craton.International Geology Review,54(12),1389-1400.
MLA Shen Liu,et al."Geochemical and isotopic constraints on the age and origin of mafic dikes from eastern Shandong Province, eastern North China Craton".International Geology Review 54.12(2012):1389-1400.
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