Triassic Palynological Assemblage of the Gulangdi Formation in Tongren County,Qinghai Province,China
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摘要: 经过对青海同仁县古浪堤组实测剖面的17块样品做孢粉分析, 在6个层位样品中见有孢粉化石30属41种, 据此在该剖面自下而上划分2个孢粉组合:Dictyophyllidites-Di-saccus组合和Verrucosisporites-Di-saccus组合.上述孢粉组合中的孢粉的优势属为Dictyophyllidites, Cyathidites, Verrucosisporites和Chasmatosporites, Protopicea, Pinuspollenites.其中, Dictyophyllidites频繁出现于欧亚、北美、大洋州的晚三叠世和早侏罗世组合, Aratrisporites在南半球大量发育于中三叠世, Asseretospora在澳大利亚的分布时期是中三叠世-早侏罗世.前人于黄南的阿龙江上游及柴陇沟北, 古浪堤组产卡尼期的菊石Protrachycerassp.及双壳类Eumorphotis (Asoella) cf.illyrica.综合而言, 该地区古浪堤组时代厘定为中-晚三叠世, 古植物群生长于暖温带-亚热带河控三角洲环境.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.
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Key words:
- palynological assemblage /
- middle-late Triassic /
- Gulangdi formation /
- Tongren County
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图 1 研究区地理与交通位置
Pm20:青海省同仁县隆务河古浪堤组剖面
Fig. 1. Geography and traffic map of the study area
图 2 中-晚三叠世古浪堤组下段 (砂板岩夹灰岩段) 综合岩性柱状图
Fig. 2. Lower member′s column of Gulangdi formation (T2-3g1)
图 3 中-晚三叠世古浪堤组中段 (砂板岩段) 综合岩性柱状图
Fig. 3. Middle member′s column of Gulangdi formation (T2-3g2)
图 4 中-晚三叠世古浪堤组上段 (砂板岩夹砾岩段) 综合岩性柱状图
Fig. 4. Upper member′s column of Gulangdi formation (T2-3g3)
图 5 青海同仁古浪堤组孢子花粉含量统计
Fig. 5. Name and centigrade fraction of spore-pollens of the Gulangdi formation in Tongren County, Qinghai Province
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