北羌塘盆地中部笙根地区索瓦组上段的孢粉型化石组合及时代
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摘要
报道北羌塘盆地笙根地区前人划分的上侏罗统索瓦组的上部发现了具有典型意义的、代表早白垩世的Dicheiropollis花粉。表明在该地区索瓦组上部是以前未能识别的下白垩统。根据该套地层中Dicheiropollis花粉的出现及孢粉组合中大量出现的Cyathidites和Classopollis,以及较为丰富的Gonyaulacysta jurassica与多类型沟鞭藻化石组合特征,确定索瓦组上部时代归属为早白垩世早期。这不仅为北羌塘盆地笙根地区早白垩世海相地层的存在提供了依据,而且为进一步分析和完善北羌塘中生代盆地演化史提供了有意义的线索。
This study reported the finding of the representative pollen Dicheiropollis of the Early Cretaceous in the upper part of the previously defined Upper Jurassic Sowa Formation in the Shenggen area, North Qiangtang Basin. The result suggests that the upper part of the Sowa Formation in this area is the Lower Cretaceous which has not been recognized before. According to the occurrence of Dicheiropollis and the abundant Cyathidites and Classopollis, as well as the characteristics of fossil assemblages of the more abundant Gonyaulacysta jurassica and various dinoflagellate, the age of the upper Sowa Formation belongs to the early Early Cretaceous. This not only provides a basis for the existence of Early Cretaceous marine strata in Shenggen area, but also provides important clues for further analysis of the Mesozoic basin evolution history of the North Qiangtang Basin.
This study reported the finding of the representative pollen Dicheiropollis of the Early Cretaceous in the upper part of the previously defined Upper Jurassic Sowa Formation in the Shenggen area, North Qiangtang Basin. The result suggests that the upper part of the Sowa Formation in this area is the Lower Cretaceous which has not been recognized before. According to the occurrence of Dicheiropollis and the abundant Cyathidites and Classopollis, as well as the characteristics of fossil assemblages of the more abundant Gonyaulacysta jurassica and various dinoflagellate, the age of the upper Sowa Formation belongs to the early Early Cretaceous. This not only provides a basis for the existence of Early Cretaceous marine strata in Shenggen area, but also provides important clues for further analysis of the Mesozoic basin evolution history of the North Qiangtang Basin.
引文
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符宏斌,马德胜,吴滔等,2015.西藏塔惹增地区中-上侏罗统仁多组的厘定及其地质意义.地质通报,34(10):1821-1825
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曾禹人,黄建国,马德胜等,2016.西藏班公湖-怒江结合带木嘎岗日岩群时代上限的新证据——来自恐弄拉地区早白垩世早期孢粉化石的报道.地质通报,35(12):2027-2032
曾胜强,王剑,陈明等,2012.北羌塘盆地索瓦组上段的时代、古气候及石油地质特征.现代地质,261(1):10-21
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潘桂棠,王立全,张万平等,2013.青藏高原及邻区大地构造图及说明书.北京:地质出版社
BAI Peirong,MA Desheng,XIONG Xingguo et al.,2014.The Xue-shan Formation of Early Cretaceous in Tonam area,northern Qiangtang Basin,sedimentary facies analysis and it's hydrocarbon Significance.Guizhou Geology,31(4):307-313
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CHENGDU Institute of Geology and Mineral Resources,2005.Regional geological survey of 1∶25 million Tucuo geological map in Tibet.Sichuan,Chengdu
COOKSONI C,EISENACK A,1958.Microplankton from Austra-lian and New Guinea Upper Mesozoic sediments.Proc.R.Soc.Victoria,70(1):19-79
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FANG Deqing,LIANG Dingyi,2000.New advances in the research on the Upper Jurassic in the Middle of the North Qiangtang Basin.Journal of Stratigraphy,24(2):163-167
FENSOME R A,1979.Dinoflagellate cysts and acritarchs from the Middle and Upper Jurassic of Jameson Land,East Greenland.Bull.Gronl.Geol.Uniders.,132:1-98
FU Hongbin,MA Desheng,WU Tao et al.,2015.The determination of Middle-Upper Jurassic Ringtor Formation in the Tare-zeng area,Tibet,and its geological significance.Geological Bulletin of China,34(10):1821-1825
GUO Xianpu,WANG Daning,DING Xiaozhong et al.,2011.Early-Middle Cretaceous sporopollen assemblages and new progress on biogeography in the northern part of Tarim Basin.Geology Review,57(6):870-880
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