Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5784272 | Lithos | 2017 | 72 Pages |
Abstract
To reconcile the 2.55 to 2.5Â Ga TTGs derived from overthickened crust, the 2.51 to 2.50Â Ga calc-alkaline volcanic rocks derived from thickened crust, tholeiitic basalts representing low pressure and an extensional tectonic setting, 2493Â Ma leucosyenogranites derived from overthickened crust, 2437Â Ma biotite-monzogranites derived from slightly thinner crust than leucosyenogranites but still thickened, as well as the clockwise hybrid ITD and IBC P-T paths of the HP granulites and widespread extension and rifting setting within the NCC from 2300Â Ma, we propose a model of an evolving subduction process. Among them, the composition of the 2.5Â Ga Changyukou volcanic rocks and potassic granites as well as the clockwise hybrid ITD and IBC P-T paths of the HP granulites may reveal that the tectonic setting in Northwest Hebei was in a transition stage from a subduction-related compressional regime to an extensional regime related to plate rollback.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geochemistry and Petrology
Authors
Peng Liou, Houxiang Shan, Fu Liu, Jinghui Guo,