Proportions of lithospheric and asthenospheric components in Late Cenozoic K and K-Na lavas in Heilongjiang Province, Northeastern China |
| |
| Authors: | S V Rasskazov I S Chuvashova Ya Liu F Meng T A Yasnygina N N Fefelov and E V Saranina |
| |
| Abstract: | Spatiotemporal compositional variations were studied in Late Cenozoic lavas in the central part of Heilongjiang Province,
China. In the rocks a common isotopically enriched asthenospheric component was determined, which is contained in lavas in
northeastern China, North and South Korea, and southeastern Japan. The potassic rock series was determined to occur in the
submeridionally trending zone of the Kedong-Erkeshan-Wudalianchi-Keluo-Xaogulihe fields, whereas the potassic-sodic series
is spatially constrained to the sublatitudinally trending Nuominhe-Wuyiling zone. The submeridional zone is though to be dominated
by the melting of lithospheric clinopyroxenites of strongly enriched isotopic and trace-element composition. The processes
of magma generation in the sublatitudinal zone were complicated by the involvement of asthenospheric peridotites of less enriched
composition in the magma generating processes. Modeling according to mixing models suggest that the major source of the partial
melts in the territory was lithospheric material with minor amounts (no more than 9%) of an asthenospheric component. The
magma generating processes were associated with the rifting-related thermal thinning of the local lithosphere during the overall
Late Cenozoic extension of the continental margin of East Asia. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
