NDLI: Geochemistry of Cenozoic basalts from the Bohai Bay Basin: Implications for a heterogeneous mantle source and lithospheric evolution beneath the eastern North China Craton

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Geochemistry of Cenozoic basalts from the Bohai Bay Basin: Implications for a heterogeneous mantle source and lithospheric evolution beneath the eastern North China Craton

Content Provider	Semantic Scholar
Author	Li, Hongyan Huang, Xiao-Long
Copyright Year	2014
Abstract	article i nfo Eocene and Miocene alkali basalts were collected from boreholes in the Jiyang Sag of the Bohai Bay Basin with the aim of investigating lithospheric evolution beneath the eastern North China Craton (NCC). These alkali basalts have oceanic island basalt (OIB)-like trace element characteristics and overall depleted Nd-Hf isotopes (eNd(t) = 2.4-6.3; eHf(t) = 7.0-10.1), consistent with derivation from slightly enriched astheno- sphere. The Miocene (b23 Ma) Guantao basalts, like the Miocene basalts in Shandong, have relatively higher concentrations of incompatible trace elements and are more depleted in heavy rare earth elements (HREEs) than the Eocene Shahejie basalts (47-45 Ma), indicating a larger proportion of melts derived from the garnet peridotite/pyroxenite. We interpret this difference as resulting from lithospheric thickening. Lithospheric thickness, estimated from the basalt geochemistry, is ~65-85 km at ~45 Ma and ~85-95 km after about 23 Ma. This inferred lithospheric thickening beneath the eastern NCC after the end of the Oligocene is consistent with decreasing paleo- heat flow in the Bohai Bay Basin from ~23 Ma to the present. The geochemical variations of the Cenozoic basalts in the Jiyang Sag reveal that the lithospheric thinning beneath the eastern NCC was on-going at ~45 Ma, but ceased after the end of the Oligocene.
Starting Page	54
Ending Page	66
Page Count	13
File Format	PDF HTM / HTML
DOI	10.1016/j.lithos.2014.02.026
Volume Number	196
Alternate Webpage(s)	https://core.ac.uk/download/pdf/71730253.pdf
Alternate Webpage(s)	https://doi.org/10.1016/j.lithos.2014.02.026
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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