Olivine and melt inclusion chemical constraints on the source of intracontinental basalts from the eastern North China Craton: Discrimination of contributions from the subducted Pacific slab

Contributions from fluid and melt inputs from the subducting Pacific slab to the chemical makeup of intraplate basalts erupted on the eastern Eurasian continent have long been suggested but have not thus far been geochemically constrained. To attempt to address this question, we have investigated Ce...

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Bibliographic Details
Published in:Geochimica et cosmochimica acta 2016-04, Vol.178, p.1-19
Main Authors: Li, Hong-Yan, Xu, Yi-Gang, Ryan, Jeffrey G., Huang, Xiao-Long, Ren, Zhong-Yuan, Guo, Hua, Ning, Zhen-Guo
Format: Article
Language:English
Subjects:
Basalt
Carbonation
Garnets
Inclusions
Mantle
Melts
Melts (crystal growth)
Olivine
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Summary:Contributions from fluid and melt inputs from the subducting Pacific slab to the chemical makeup of intraplate basalts erupted on the eastern Eurasian continent have long been suggested but have not thus far been geochemically constrained. To attempt to address this question, we have investigated Cenozoic basaltic rocks from the western Shandong and Bohai Bay Basin, eastern North China Craton (NCC), which preserve coherent relationships among the chemistries of their melt inclusions, their hosting olivines and their bulk rock compositions. Three groups of samples are distinguished: (1) high-Si and (2) moderate-Si basalts (tholeiites, alkali basalts and basanites) which were erupted at ∼23–20Ma, and (3) low-Si basalts (nephelinites) which were erupted at
ISSN:0016-7037
1872-9533
DOI:10.1016/j.gca.2015.12.032