TY - JOUR
T1 - The Western Ailaoshan Volcanic Belts and their SE Asia connection
T2 - a new tectonic model for the Eastern Indochina Block
AU - Lai, Chun-Kit
AU - Meffre, Sebastien
AU - Crawford, Anthony J.
AU - Zaw, Khin
AU - Xue, Chuan-Dong
AU - Halpin, Jacqueline A.
PY - 2014/7
Y1 - 2014/7
N2 - The Western Ailaoshan (WAL) Volcanic Belts mark the western boundary of the South China-Indochina Suture Zone along the Ailaoshan Fold Belt. Geochronological and geochemical evidence suggests that the WAL Volcanic Belts vary in ages and origins, and includes (1) L. Carboniferous-earliest M.-Permian (ca. 300-270. Ma) incipient backarc basin magmatism; (2) M. Permian (ca. 265. Ma) island arc/mature backarc basin magmatism; (3) early L. Permian (ca. 260-255. Ma) WAL-Indochina arc-continent collision and the associated syn-collisional granitic magmatism, as well as subsequent (4) E. Triassic (ca. 250-245. Ma) post-collisional magmatism. Regional geological comparison indicates that the post-L. Carboniferous WAL tectonic evolution was closely related to the Eastern Indochina Block. We present a new G-Plate geodynamic evolution model for the Ailaoshan Fold Belt and its surrounding South China-Indochina region, based on new and published U-Pb zircon ages, together with whole rock and Pb-isotope geochemical data.
AB - The Western Ailaoshan (WAL) Volcanic Belts mark the western boundary of the South China-Indochina Suture Zone along the Ailaoshan Fold Belt. Geochronological and geochemical evidence suggests that the WAL Volcanic Belts vary in ages and origins, and includes (1) L. Carboniferous-earliest M.-Permian (ca. 300-270. Ma) incipient backarc basin magmatism; (2) M. Permian (ca. 265. Ma) island arc/mature backarc basin magmatism; (3) early L. Permian (ca. 260-255. Ma) WAL-Indochina arc-continent collision and the associated syn-collisional granitic magmatism, as well as subsequent (4) E. Triassic (ca. 250-245. Ma) post-collisional magmatism. Regional geological comparison indicates that the post-L. Carboniferous WAL tectonic evolution was closely related to the Eastern Indochina Block. We present a new G-Plate geodynamic evolution model for the Ailaoshan Fold Belt and its surrounding South China-Indochina region, based on new and published U-Pb zircon ages, together with whole rock and Pb-isotope geochemical data.
KW - Western Ailaoshan (WAL) Volcanic Belts
KW - SE Asia
KW - Arc/backarc basin
KW - Arc–continent collision
KW - G-Plate tectonic reconstruction
UR - http://www.scopus.com/inward/record.url?scp=84899904536&partnerID=8YFLogxK
U2 - 10.1016/j.gr.2013.03.003
DO - 10.1016/j.gr.2013.03.003
M3 - Article
AN - SCOPUS:84899904536
SN - 1342-937X
VL - 26
SP - 52
EP - 74
JO - Gondwana Research
JF - Gondwana Research
IS - 1
ER -