New paleontological evidence on time determination of the east part of the Eastern Kunlun Mélange and its tectonic significance  

作　　者：ZHANG Kexin LIN Qixiang ZHU Yunhai YIN Hongfu LUO Mansheng CHEN Nengsong WANG Guocan 

机构地区：[1]Faculty of Earth Science, China University of Geosciences, Wuhan 430074, China Faculty of Earth Science, China University of Geosciences, Wuhan 430074, China Faculty of Earth Science, China University of Geosciences, Wuhan 430074, China Faculty of Earth Science, China University of Geosciences, Wuhan 430074, China Faculty of Earth Science, China University of Geosciences, Wuhan 430074, China Faculty of Earth Science, China University of Geosciences, Wuhan 430074, China Faculty of Earth Science, China University of Geosciences, Wuhan 430074, China

出　　处：《Science China Earth Sciences》2004年第10期865-873,共9页中国科学（地球科学英文版）

摘　　要：New paleontological evidence suggests that the composition of the matrix and slices from the middle and the south of the Eastern Kunlun Mélange Belt is very complex, ranging from Proterozoic to Mesozoic in geological time. A Cambrian acritarch assemblage has been discovered from the middle part of the Eastern Kunlun Mélange, a Neoproterozoic to the early Paleozoic acritarch assemblage has been discovered from the south of the Eastern Kunlun Mé lange, and so has been an Early Permian radiolarian from the A’nyemaqen Mélange in Buqing- shan. In addition, some sporopollen has been obtained from the Mesozoic tectonic slices. The above-mentioned paleontological evidence indicates that the Eastern Kunlun Orogenic Belt experienced two episodes from ocean to continent from the Neoproterozoic to the Early Paleo- zoic and in the Late Paleozoic respectively. In the process of intracontinent development in Mesozoic, because of heavy thrust-nappe, strike-slip sheer and crust shortening, the Mesozoic formation was intercalated in mélange by slices and the Eastern Kunlun Orogenic Belt became more complex.New paleontological evidence suggests that the composition of the matrix and slices from the middle and the south of the Eastern Kunlun Mélange Belt is very complex, ranging from Proterozoic to Mesozoic in geological time. A Cambrian acritarch assemblage has been discovered from the middle part of the Eastern Kunlun Mélange, a Neoproterozoic to the early Paleo-zoic acritarch assemblage has been discovered from the south of the Eastern Kunlun Mélange, and so has been an Early Permian radiolarian from the A’nyemaqen Mélange in Buqingshan. In addition, some sporopollen has been obtained from the Mesozoic tectonic slices. The above-mentioned paleontological evidence indicates that the Eastern Kunlun Orogenic Belt experienced two episodes from ocean to continent from the Neoproterozoic to the Early Paleozoic and in the Late Paleozoic respectively. In the process of intracontinent development in Mesozoic, because of heavy thrust-nappe, strike-slip sheer and crust shortening, the Mesozoic formation was intercalated in mélange by slices and the Eastern Kunlun Orogenic Belt became more complex.

关 键 词：EASTERN KUNLUN MELANGE Belt  paleobio-assemblage  time determination  geotectonic evolution. 

分 类 号：N[自然科学总论]