Discovery of Paleogene palynological assemblages from the Wanbaogou Group-complex in western part of the Eastern Kunlun orogenic belt and its geological significance

查看全文 作　　者：GUO Xianpu WANG Naiwen DING Xiaozhong ZHAO Min WANG [1]Daning

机构地区：[1]Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

出　　处：《Science China Earth Sciences》索引2006年第49卷第4期,共10页

基　　金：supported by the National Natural Science Foundation of China(Grant No.40272019);the China Geological Survey(Grant No.200313000054). 摘　　要：The Wanbaogou Group-complex is a suit of mélange aggregation of the Eastern Kunlun orogenic belt, which is divided into two parts, i.e. the exotic blocks and the matrix strata. Based on stromatolite fossils yielded in the exotic blocks, the age of this group-complex was once defined to the Precambrian. Recently, two Paleogene palynological assemblages have been found in samples from the matrix strata of the Upper Part in this group-complex by the authors: in ascending order, the Al- nipollenites-Quercoidites assemblage of Late Eocene and the Caryapollenites-Pinuspollenites as- semblage of Early Oligocene. Those results show that the matrix strata of this mélange were mainly formed in Paleogene, and the event causing mixture should be a Himalayan Movement Phase. This paper is designed to provide some detailed evidence for determining the age of the matrix strata in this group-complex based upon study at the Kunlunqiao Section, which would be of important geo- logical significance for further understanding this group-complex as a suit of mélange aggregation and establishing or improving the stratigraphic framework of the studied region. The new finding will cer- tainly benefit from now on the investigation on geotectonic and sedimentary evolution of Eastern Kunlun. 关键词：Wanbaogou Group-complex, Paleogene, palynological assemblages, MÉLANGE aggregation, the Eastern KUNLUN OROGENIC belt.

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Discovery of Paleogene palynological assemblages from the Wanbaogou Group-complex in western part of the Eastern Kunlun orogenic belt and its geological significance

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