摘要
本文研究了河南南阳、周口、任店、洛阳、灵宝、潭头、开封等中、新生代沉积盆地的白垩纪—早第三纪大量的介形虫化石,并划分为8个组合。研究了各组合的地理分布及地质时代,讨论了它们的组合特征及演化规律,并对各组合生存期的古气候以及它们在石油勘探工作中的意义做了探讨。
Owing to the Yanshanian and Himalayan orogenies beginning in the Jurassic and Tertiary respectively, many Mesozoic-Cenozoic sedimentary basins developed in He-nan province, lying in the junction between the North China platform and the Qin-ling geosyncline, many of which contain plenty of mineral resources such as petroleum, gypsum and trona. Stratigraphic studies are very important in exploring for and developing mineral deposits in these basins; among them, palaeontological research has played a key role in Stratigraphic division and correlation, determination of the ages of the strata and understanding of the sedimentary environments. This paper studies systematically the temporal-spatial distribution, assemblage features, ages and evolutional trends of the Cretaceous-Tertiary ostracods in the Nanyang, Zhoukou, Rendian, Lingbao, Tantou and Kaifeng basins in Henan province. Eight ostracod assemblages have been recognized in ascending order as follows: 1. Cypridea (Cypridea) vitimensis-C. (C.) unicostata-Ziziphocypris costata-Darwinula leguminella assemblage; 2. Cypridea (Pseudocypridina)-Mongolianella-Candona assemblage; 3. Sinocypris multipuncta-Candona (Candona) paracompressa-C. (Typhlocypris) acuminate assemblage; 4. Cypris henanensis-Eucypris subtriangularis-Sinocypris reticulata-Limnocy-there hubeiensis assemblage; 5. Tuberocypris zhongguoensis-Cyprinotus (Hemicypri-notus) cuneatus assemblage; 6. Cyprinotus (Heterocypris) macronefandus-C. (H.) igneus-C. (Cyprinotus) altilis assemblage; 7. Cyprinotus (C.) xiaozhuangensis-C. (C) liaozhuangensis-C. (Heterocypris) jingheensis assemblage; 8. Dongyingia vent-t-spinata-Phacocypris guangraoensis-Chinocythere cornuta assemblage.The present study shows that the main evolutional direction of Early Cretaceous ostracods is represented by the developemnt from the dominance of Cypridea (Cypridea) in the early part to the dominance of Cypridea (Pseudocypridind) in the late part, while the main trend of Eogene ostrocids is expressed by the development from the flourishing
出处
《地质学报》
EI
CAS
CSCD
北大核心
1994年第3期278-286,共9页
Acta Geologica Sinica
关键词
白垩纪
第三纪
地层
介形虫
ostracod assemblage, Cretaceous, Tertiary
