The discovery of ostracods assemblages from Early Cretaceous Chijinpu Formation in Tiancang area, Jiuquan, Gansu Province, and its geological significance
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摘要:
甘肃酒泉市天仓地区地层剖面发现丰富的介形类，计7属18余种，前人将该套地层划为上新统疏勒图组，本次结合化石时代和岩石组合，将其修订为早白垩世赤金堡组，并建立了2个介形类化石组合：下部Cypridea concina-Candona prona-Cypridea zhaobishanensis组合和上部Cypridea concina-Cypridea justa-Darwinulla leguminella组合，根据区域对比，将下部组合的时代厘定为早白垩世Hauterivian期，上部组合的时代厘定为早白垩世Barremian期。根据2个介形类组合的属种分布及化石形态特征的演化特征，对赤金堡组三段沉积期古生态、古气候进行讨论，认为湖盆在Barremian期较Hauterivian期更深广，气候具有变温暖湿润的趋势，这与全球早白垩世气候波动事件有良好的响应。
Abstract:Diverse and abundant ostracods fossils were found from the Tiancang area of Jiuquan, Gansu Province.This research was based on 18 species of ostracods that belong to 7 genera.Based on the age of the fossils and the rock assemblage, we revise the strata to Chijinpu Formation of Early Cretaceous instead of Shuletu Formation of Pliocene in previous research.two assemblages were observed:Cypridea concina-Candona prona-Cypridea zhaobishanensis assemblage in the lower part and Cypridea concina-Cypridea justa-Darwinulla leguminella assemblage in the upper part.The correlation of the ostracods assemblages from the study section with the ostracods fauna in the same strata in other parts of the world indicates that the lower assemblage is of Hauterivian epoch, and the upper assemblage is of Barremian epoch.Based on an analysis of the evolution of fossil morphology and species distribution, the authors hold that the basin was deeper and wider in the Barremian epoch than in the Hauterivian epoch, while the climate showed a tendency of warming and wetting, which had a good response to the global climatic fluctuation events during Early Cretaceous.
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Key words:
- ostracods /
- Early Cretaceous /
- paleoenvironment /
- Chijinpu Formation /
- Gansu Province
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表 1 甘肃酒泉天仓地区赤金堡组三段介形类化石组合与区域对比
Table 1. Regional correlation of ostracods assemblages in the third member of Chijinpu Formation in Tiancang area of Jiuquan, Gansu Province
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