Long-lived Paleotethyan pelagic remnant inside Shan-Thai Block:Evidence from radiolarian biostratigraphy

Newly identified radiolarians from ribbon chert in the Mae Hong Son-Mae Sariang area, northwestern Thailand covered Early Carboniferous, Late Permian, and Middle-Late Triassic in age, which indicate that there was a pelagic basin during the Late Paleozoic and Triassic in this region together with the published radiolarian biostratigraphic data. This basin is joined with the Chiang Dao and Changning-Menglian oceanic basins, which represent the main oceanic basin of Paleotethyan Archipelago Ocean. The main oceanic basin was situated in the traditional "Shan-Thai Block". Therefore, "the Shan-Thai Block" was not a single block during that stage, but composed of the Paleotethyan Ocean and two continental terranes that affiliated to Gondwana and Cathysian domains respectively.

作 者： FENG Qinglai Chongpan Chonglakmani Dietrich Helmcke Rucha Ingavat-Helmcke   作者單位： FENG Qinglai(Faculty of Earth Science, China University of Geosciences, Wuhan 430074, China)

Chongpan Chonglakmani(School of Geotechnology, Suranaree University of Technology, Nakhon Ratchasima, Thailand)

Dietrich Helmcke,Rucha Ingavat-Helmcke(Center of Geosciences, University of G(o)ttingen, Goldschmidtstr. 3, D-37077 G(o)ttingen, Germany) 

刊 名： 中國科學D輯（英文版）  SCI 英文刊名： SCIENCE IN CHINA SERIES D  年，卷(期)： 2004 47(12)  分類號： P5  關鍵詞： Late Paleozoic and Triassic   radiolarian   northwest Thailand   Shan-Thai Block   Paleotethys