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2 results on '"Chaogui, YANG"'

1. Geochemical and isotopic constraints on the age and origin of mafic dikes from eastern Shandong Province, eastern North China Craton

Author

Yuhong Yang, Caixia Feng, Chaogui Yang, Ruizhong Hu, Guangying Feng, Liang Tang, Youqiang Qi, Shen Liu, Ian M. Coulson, and Shan Gao

Subjects
Dike, geography, geography.geographical_feature_category, Eastern china, North china, Geochemistry, Geology, Craton, Magma, Mesozoic, Mafic, Petrology, Zircon
Abstract

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 (87Sr/86Sr) i ranging from 0.7082 to 0.7087, low ϵNd(t) values from −17.0 to −17.5, 206Pb/204Pb from 17.14 to 17.18, 207Pb/204Pb from 15.44 to 15.55, and 208Pb/204Pb 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 ...

Published
2011

2. U-Pb Zircon Age, Geochemical, and Sr-Nd-Pb Isotopic Constraints on the Age and Origin of Mafic Dykes from Eastern Shandong Province, Eastern China.

Author

Shen, LIU, Ruizhong, HU, Caixia, FENG, Shan, GAO, Guangying, FENG, Shaocong, LAI, Youqiang, QI, COULSON, Ian M., Yuhong, YANG, Chaogui, YANG, and Liang, TANG

Subjects
LEAD isotopes, URANIUM isotopes, ZIRCON analysis, ANALYTICAL geochemistry, MAFIC rocks, DIKES (Geology)
Abstract

U-Pb zircon age, geochemical, and Sr-Nd-Pb isotopic data of mafic dykes from eastern Shandong Province, eastern China is reported herein. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) U-Pb zircon analyses of two samples from the investigated mafic dykes yield consistent ages ranging from 121.9 Ma ± 0.47 Ma to 122.9 Ma ± 0.61 Ma. The mafic dykes are characterized by high (87Sr/86Sr)i ranging from 0.7087 to 0.7089, low εNd( t) values ranging from −16.9 to −17.8, 206Pb/204Pb = 17.15 to 17.17, 207Pb/204Pb = 15.45 to 15.47, and 208Pb/204Pb = 37.59 to 37.68. Results from the current study suggest that the mafic dykes are derived from partial melting of ancient lithospheric mantle that was variably hybridized by melts derived from foundered lower crustal eclogite. The mafic dykes may have been generated through subsequent insignificant crystal fractionation and very minor crustal contamination during magma ascent. Combined with previous studies, the current findings provide new evidence that the intense lithospheric thinning beneath the eastern Shandong Province of eastern China occurred at ∼120 Ma, and that this condition was caused by the removal of the lower lithosphere (mantle and lower crust). [ABSTRACT FROM AUTHOR]

Published
2013
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