班公湖—怒江缝合带中西段改则地区木嘎岗日岩群的孢粉型化石组合及时代

doi:10.19388/j.zgdzdc.2020.04.08

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Abstract The sedimentary age of Muga-Gangri Rock Group in the middle and western part of Bangong Co-Nujiang suture zone experienced the cleavage and extension of Bangong Co-Nujiang Ocean basin and the stage of extrusion convergence. The sedimentary age span is relatively large, but its sedimentation epoch limit is still inconclusive. In order to explore the relationship between the upper limit of the sedimentary age of Muga-Gangri Rock Group and the closure time of Bangong Co-Nujiang Ocean in the rectified area, through the field geological survey and indoor comprehensive research, the authors found the typical pollen molecule Dicheiropollis in Early Cretaceous. This discovery of pollen indicates that Muga-Gangri Rock Group in the middle and western part of Bangong Co-Nujiang suture zone continued to deposit in Early Cretaceous. These discoveries have great geological significance in the discussion of paleo geographical features, sedimentary environment and their development history in Mesozoic period in the middle and western part of Bangong Co-Nujiang suture zone.

Key words： palynomorph fossil Muga-Gangri Rock Group Early Cretaceous Bangong Co-Nujiang suture zone

Received: 15 July 2019

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	BAI Peirong
	XIONG Xingguo

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BAI Peirong,XIONG Xingguo. Palynomorph fossil assemblages and ages of Muga-Gangri Rock Group in Gaize area of the middle and western part of Bangong Co-Nujiang suture zone in Tibet[J]. , 2020, 7(4): 60-66.

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http://www.zgdzdcbjb.com/EN/10.19388/j.zgdzdc.2020.04.08 OR http://www.zgdzdcbjb.com/EN/Y2020/V7/I4/60

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