Changhsingian Radiolarian Fauna from the Meishan D Section and Sea-Level Changes
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摘要: 煤山D剖面长兴组的放射虫动物群的研究成果很少.对煤山D剖面的放射虫动物群进行了详细的鉴定、个体数量和种的数量的统计.结果表明: 煤山D剖面长兴组的放射虫动物群的相对丰度、简单分异度与长兴期海平面变化具有耦合性: 放射虫丰度、分异度较大的层位基本对应于长兴早期和长兴晚期2次最大海侵事件发生的层位.长兴早期放射虫的丰度和分异度较大(相对长兴晚期而言), 这与长兴早期水体相对较深有关.煤山剖面放射虫动物群与海平面变化之间的这种耦合性为海平面变化的研究提供了依据.Abstract: There is relatively less research for radiolarian fauna in the Meishan D Section of Changxing County, Zhejiang Province. The radiolarian species in each sample from the Meishan D Section were identified, and the individuals in 0.5 g dried samples (sieved through 300 meshes) were counted out. The research shows the abundance and diversity are closely related to sea level changes of Changhsingian age at the Meishan D Section. Where abundance and diversity reach higher values, the sea level would have peaked (e. g. maximum transgression surfaces). The abundance and diversity of radiolarians from the early Changhsingian is greater than that of the late Changhsingian age, which coincides with the opinion that the marine water was deeper in the early Changhsingian than in the late Changhsingian. This conclusion provides evidence that radiolarian abundance and diversity are indicators for investigating sea-level changes.
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Key words:
- radiolarian /
- relative abundance /
- simple diversity /
- sea-level change /
- Changhsingian /
- Meishan
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图 1 浙江长兴煤山D剖面长兴组放射虫电镜扫描照片
1-6.Entactinia itsukaichiensis, Sashida and Tonishi. (1985);1.第11层, 1989×300;2.第11层, 1128×300;3.第11层, 1978×270; 4.第11层, 1968×300;5.第11层, 1962×430;6.第11层, 1976×200;7.Lepingosphaera stauracanthus, Feng et al. (待发表); 第12层, 2000×240;8.Cauletellidae gen. et sp. indet; 第23层, 1154×160;9-12.Copicyntra robustodentata, Kozur and Mostler (1989); 9.第11层, 1992×600;10.第11层, 1960×390;11.第11层, 1969×200;12.第11层, 1162×390;13-15.Grandetortura nipponica, Sashida and Tonishi (1991); 13.第11层, 1967×390;14.第11层, 1955×390;15.第11层, 1994×470;16., sp. 1;第11层, 1115×150;17.sp. 2;第11层, 1122×300
Fig. 1. Microgram of Changhsingian radiolarian from Meishan D Section, Zhejiang Province
图 2 煤山D剖面长兴组放射虫的相对丰度、简单分异度与海平面变化之间的关系(据He et al. (2005)中
Fig. 2. Coupling relationship of Changhsingian radiolarian relative abundance and simple diversity and sea-level changes in Meishan D Section
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