The Permian seamount stratigraphic sequence in Chiang Mai, North Thailand and its tectogeographic significance  

作　　者：CHONGLAKMANI Chongpan 

机构地区：[1]School of Geotechnology,Suranaree University of Technology

出　　处：《Science China Earth Sciences》2008年第12期1768-1775,共8页中国科学（地球科学英文版）

基　　金：the National Natural Science Foundation of China (Grant Nos.40372105,40772143);"111" Project (Grant No. B08030);Suranaree University of Technology, Thailand

摘　　要：The widespread Permian carbonate strata outcropped in northwestern Thailand are considered as the evidence for the Late Paleozoic shallow Tethys. Our investigation, however, shows that basalt can be discovered usually under the Permian carbonate sequenceThe widespread Permian carbonate strata outcropped in northwestern Thailand are considered as the evidence for the Late Paleozoic shallow Tethys. Our investigation, however, shows that basalt can be discovered usually under the Permian carbonate sequence in Chiang Mai-Fang area, northwestern Thailand. The basalt belongs to subalkalic basalt and potassic trachybasalt. They are characterized by high P and Ti in major elements, by high content, enriching LREE, lacking δEu anomaly in rare earth elements, and by enrichment of the large ion lithophile element (LILE) (K, Rb, Ba) and high field strength element (HFSE) (Nb, Ta, Zr) in trace elements, which can be compared with the characters of the oceanic island basalt in Three Rivers (Jinsha River, Lancang River, and Nujiang River) area, southwestern China. Therefore, the Permian carbonate in the studied area was deposited on a sea-mount, rather than on a stable carbonate platform. The oceanic basin is correlated to the Late Paleozoic ocean represented by the Changning-Menglian Belt in southwestern China and they are a major basin of the Paleo-Tethyan Archipelagoes Ocean. The result indicates nonexistence of a Shan-Thai Block in the Late Paleozoic.

关 键 词：SEAMOUNT STRATIGRAPHIC sequence BASALT Late PALEOZOIC NORTH Thailand PALEO-TETHYS 

分 类 号：P534.46[天文地球—古生物学与地层学]