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New Materials of Fusulinacean from Xinjiang and Their Significance in Structural Geology

YANG Xiang-ning, JIA Dong, LU Hua-fu   

  1. Department of Earth Science, Nanjing University, Nanjing 210093, China
  • Received:2001-12-20 Revised:2001-12-20 Online:2001-12-20 Published:2001-12-20

Abstract: Some new materials of the Early Permian fusulinacean from Keping and Wushi of Xinjiang are described, which provided further information for the analysis of fusulinacean biostratigraphy and paleobiogeograhy of the Permian. The study shows that the fusulinacean fauna of the Early Permian in Tarim basin is very similar to that of the same age in the southwestern China, particularly in sharing sortie endemic species of Robustoschwagerina, which the past have only been found in Guizhou, Guangxi and Yunnan province. The similarity of fusulinacean faunas indicates that the Tarim plate and southwestern China plate probably were at the similar latitudes in the Early Permian and close to each other geographically. However, this conclusion from the fusulinacean study is inconsistent with the paleomagnetic data, which suggested a N 30.6°for Trim plate and a S 7.0°for the upper Yangtze River plate in the Early Permian. Based on recent studies on the movement of micro-plates and the direct1cm of plaeocirculation of Tethys during the Carbon-Permian, the authors made a preliminary discussion on the possible mechanism that may cause the similarity of fusulinacean faunas between the two apart plates. It is suggested that the counter-clockwise circulation of the paleo-Tethys could possibly carry those fusulinacean species originally endemic to the South China plate northwards to the ocean regions adjacent to the Tarim plate. Nevertheless, this hypothesis should be tested by further paleontologic and stratigraphic studies.