Relation of isotope geochemical steep zones with geophysical fields and tectonics in the junction area of the Cathaysian, Yangtze and Indochina plates

Citation
Bq. Zhu et al., Relation of isotope geochemical steep zones with geophysical fields and tectonics in the junction area of the Cathaysian, Yangtze and Indochina plates, ACT GEO S-E, 74(2), 2000, pp. 236-240
Citations number
20
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
ACTA GEOLOGICA SINICA-ENGLISH EDITION
ISSN journal
1000-9515 → ACNP
Volume
74
Issue
2
Year of publication
2000
Pages
236 - 240
Database
ISI
SICI code
1000-9515(2000)74:2<236:ROIGSZ>2.0.ZU;2-D
Abstract
Through lead isotope geochemical mapping in the Yunnan-Guizhou area geochem ical steep zones (GSZ) have been established, which clearly reveal the junc tion relationship of the Cathaysian, Yangtze and Indo-China plates. GSZ are closely related to gravity Moho gradient zones and lithospheric thickness. The GSZ between the Yangtze and Cathaysian plates is consistent with the S hizong-Mile tectonic belt, where island are basalts are well developed. The Yangtze-Indo-China GSZ is parallel to the Jingdong-Mojiang volcanic belt i n rift-island are environments. The evidence of geology, geophysics and geo chemistry all indicates that Cathaysia was subducted towards the Yangtze pl ate and that the Yangtze plate was underthrust beneath the Indo-China, whic h took place from the Early Carboniferous to the Early Triassic.