Magnetically stratified continental lower crust preserved in the North China Craton

Zhiyong Li*, Jianping Zheng, Qingsheng Liu, W. L. Griffin, Xiangyun Hu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The magnetic properties of lower crustal xenoliths, and outcropping granulites suggest that magnetically stratified lower crust is preserved in the northern North China Craton. The upper layer (~24-33km) is represented by strongly magnetic granulite-facies terrains, in which the mafic granulites have the highest susceptibility (κ, mean 67.92×10-3SI) and natural remanent magnetization (NRM, mean 0.59Am-1). In contrast, the lowermost layer (~33-42km) is mainly composed of mafic granulites and pyroxenites sampled as xenoliths, which are weakly magnetic with κ and NRM of 0.9-1.5×10-3SI and 0.04-0.1Am-1, respectively. The formation of the weakly magnetized lowermost crustal layer is associated with continuous underplating of mantle-derived basaltic magmas at the pre-existing crust-mantle boundary from the late Mesozoic to Cenozoic. We suggest that this magnetically stratified lower crust may be widespread beneath the North China Craton.

Original languageEnglish
Pages (from-to)73-79
Number of pages7
JournalTectonophysics
Volume643
DOIs
Publication statusPublished - 7 Mar 2015

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