青海省同仁县古浪堤中上三叠统古浪堤组孢粉组合及其地层意义

徐亚东; 喻建新; 罗根明; 寇晓虎; 陈奋宁

Volume 32 Issue 5

Sep. 2007

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Article Navigation > Earth Science > 2007 > 32(5): 638-650

XU Ya-dong, YU Jian-xin, LUO Gen-ming, KOU Xiao-hu, CHEN Fen-ning, 2007. Triassic Palynological Assemblage of the Gulangdi Formation in Tongren County,Qinghai Province,China. Earth Science, 32(5): 638-650.

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Triassic Palynological Assemblage of the Gulangdi Formation in Tongren County,Qinghai Province,China

1.
Faculty of Earth Sciences , China University of Geosciences, Wuhan 430074, China
2.
BGEG Laboratory at China University of Geosciences, Wuhan 430074, China

Received Date: 2007-06-16
Publish Date: 2007-09-25

Abstract

Abstract

The Triassic Gulangdi formation is well developed in Gulangdi section, Tongren County, Qinghai Province, western China. 17 Palynological samples were collected from the Section; of these, 6 samples are productive. In total, 30 Palynological genera and 41 species have been identified. Based on the stratigraphic distribution, 2 palynological assemblages can be defined in ascending order: Dictyophyllidites-Di-saccus Assemblage and Verrucosisporites-Di-saccus Assemblage. In the two palynological assemblages, the dominant sporopollens are Dictyophyllidites, Cyathidites, Verrucosisporites and Chasmatosporites, Protopicea, Pinuspollenites. Among them, Dictyophyllidites is quite common from late Triassic to early Jurassic in Eurasia, North America, Oceania. Aratrisporites flourished in middle Triassic in southern hemisphere; in Australia, Asseretospora ranged form middle Triassic to early Jurassic.As we know, a late Triassic ammonite fossil Protrachyceras and bivalve fossil Eumorphotis (Asoella) cf.illyrica had been established from the Gulangdi formation at Huangnan County. Based on the above-mentioned ammonite assemblage and the palynological assemblages proposed in this paper, the Gulangdi formation at Gulangdi section may be assigned to middle-late Triassic in age. Furthermore, the palaeoflora in this region may be growing of the environment from warm temperate zone to subtorrid zone.
- palynological assemblage,
- middle-late Triassic,
- Gulangdi formation,
- Tongren County

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Triassic Palynological Assemblage of the Gulangdi Formation in Tongren County,Qinghai Province,China

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