Enriched upper mantle and eclogitic lower crust in north Qiangtang, Qinghai-Tibet Plateau: petrological and geochemical evidence from the Cenozoic volcanic rocks.

Authors
Citation
Sc. Lai et Cy. Liu, Enriched upper mantle and eclogitic lower crust in north Qiangtang, Qinghai-Tibet Plateau: petrological and geochemical evidence from the Cenozoic volcanic rocks., ACTA PETR S, 17(3), 2001, pp. 459-468
Citations number
33
Language
CHINESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
ACTA PETROLOGICA SINICA
ISSN journal
1000-0569 → ACNP
Volume
17
Issue
3
Year of publication
2001
Pages
459 - 468
Database
ISI
SICI code
1000-0569(200107)17:3<459:EUMAEL>2.0.ZU;2-S
Abstract
Using the petrological and geochemical method, the Cenozoic volcanic rocks collected from north Qiangtang, Qinghai-Tibet plateau were dealt with in th is paper. The research results indicate that the Tertiary volcanic rocks ca n be devided into two different associations: alkaline (shoshonitic) series and high-potassium calc-alkaline series. They originated from a special in homogeneously enriched upper mantle and a eclogitic lower crust, respective ly. It shows that the north part of Qinghai-Tibet plateau develops a enrich ed mantle source and a eclogitic lower crust in Cenozoic period at the spec ific tectonic setting of plates collision. This recognization is significan t for further discussions about the uplift mechanism and continental dynami cs of the Qinghai-Tibet plateau.