Palynological Assemblage in Section D of Meishan, Changxing, Zhejiang and Its Significance of Global Correlation
Palynological Assemblage in Section D of Meishan, Changxing, Zhejiang and Its Significance of Global Correlation
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2004
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通讯作者：
C. Bin
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作者：
C. Bin
浙江长兴梅山D段（GSSP） 14 m内银坑组（25-60层）89份样品中，12份共鉴定出47属50种。孢粉组合为Lundbladispora-Taeniaesporites-Equisetosporites，以裸子植物花粉为主（59.0% ~ 79.6%），蕨类植物孢子次之（20.4% ~ 40.0%）。裸子植物花粉以针叶树双芽糖花粉为主（19.7% ~ 54.4%），其中针叶树双芽糖花粉多样性和丰度最高。条纹状双囊花粉为次生花粉，单属多囊花粉丰度为24.3%。蕨类孢子以Liotriletes为主（14.3% ~ 24.4%），以cycloid Puncatisporites为主（16.2%）。次生孢子为棘刺孢子、粒状孢子和疣状孢子（1.9%-21.2%）。腐三叶孢子数量相对较少，但分布较广，主要为棱叶孢子。分殖三联体孢子相当罕见。值得注意的是，该孢粉组合在梅山D剖面与牙形刺Isarcicella isarcica带和Clarkina carinata-C相关。与华南其他剖面的孢粉组合相当，但与华北的孢粉组合不相容。这种区分表明华北中生代孢粉组合的演化早于华南。
Altogether 47 genera and 50 species were identified in 12 of all the 89 samples taken within 14 m Yinkeng Formation (Bed 25-60) in Meishan Section D (GSSP) of Changxing in Zhejiang. The palynological assemblage is Lundbladispora-Taeniaesporites-Equisetosporites with the dominance (59.0%-79.6%) of gymnosperm pollen and secondary (20.4%-40.0%) of fern spore. The gymnosperm pollen was dominated by the instriate bisaccate (19.7%-54.4%) characterized by the greatest diversity and abundance of coniferousbisaccate pollen. The striate bisaccate pollen is secondary and the polyclicate pollen composed of only one genus Equisetosporites has an abundance up to 24.3%. The fern spore was dominantly represented by Liotriletes (14.3%-24.4%) with the predominance of the cycloid Puncatisporites (16.2%). The secondary are the echinate, granular and verrucose trilete spores (1.9%-21.2%). The fastigiate trilete spore has a relatively low quantity but spreads wide, mainly Lundbladispora. Zonotrilete spore is quite rare. Significantly, this palynological assemblage in Section D of Meishan, correlative with the conodont Isarcicella isarcica Zone and the Clarkina carinata-C. planate Zone, is comparable with palynological assemblages observed in other sections in South China but incompatible with those in North China. This discrimination suggests the earlier evolution of Mesozoic palynological assemblage in North China than in South China.