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Relation of Isotope Geochemical Steep Zones with Geophysical Fields and Tectonics in the Junction Area of the Cathaysian, Yangtze and Indochina Plates
Author(s) -
Bingquan ZHU,
Yunpeng Dong,
Xiangyang CHANG,
Zhengwei ZHANG
Publication year - 2000
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.2000.tb00456.x
Subject(s) - geology , subduction , tectonics , lithosphere , rift , geochemistry , basalt , plate tectonics , mesozoic , carboniferous , paleontology , structural basin
Through lead isotope geochemical mapping in the Yunnan‐Guizhou area geochemical steep zones (GSZ) have been established, which clearly reveal the junction relationship of the Cathaysian, Yangtze and Indo‐China plates. GSZ are closey related to gravity Moho gradient zones and lithospheric thickness. The GSZ between the Yangtze and Cathaysian plates is consistent with the Shizong‐Mile tectonic belt, where island are basalts are well developed. The Yangtze‐Indo‐China GSZ is parallel to the Jingdong‐Mojiang volcanic belt in rift‐island are environments. The evidence of geology, geophysics and geochemistry all indicates that Cathaysia was subducted towards the Yangtze plate and that the Yangtze plate was underthrust beneath the Indo‐China, which took place from the Early Carboniferous to the Early Triassic.