湖北京山早三叠世有孔虫动物群的发现及其意义

DISCOVERY OF THE EARLY TRIASSIC FORAMINIFERAL FAUNA FROM THE JINGSHAN AREA OF HUBEI AND ITS SIGNIFICANCE

本文首次报道了湖北京山地区早三叠世有孔虫动物群，计６属１５种，其中包括４新种。在对该动物群分析基础上，作者建立了Ａｕｌｏｔｏｒｔｕｓｃｈｉａｌｉｎｇｃｈｉａｎｇｅｎｓｉｓ－Ｄｉｃｈｏｓｐｉｒａｓｉｎｅｎｓｉｓ组合带。通过对其古生态特征及生物相研究，揭示了该动物群的生活习性与生态环境的关系。简述了该有孔虫动物群的发现在地层划分对比及油气勘探中的意义。

This paper reports for the first time the discovery of Early Triassic foraminiferal fauna from the Jingshan area, with the establishment of the Aulotortus chialingchiangensts-Dichos pira sinensis Zone (Olenekian) based on the study of the fauna. This fauna is collected from the Lower Chialingkiang Formation consisting of calcarenite with dolomitic limestone inter calated bed. The discovery of this fauna has provided a reliable basis for the subdivision of the Lower Triassic in the study area which is in lack of fossils and correlation between sur face strata and underground strata. The foraminiferal fauna of the study area may be corre lated with the Aulotorrus chialingchiangensis-A. xintanensis Zone of the Yangtze Gorge area and the Aulotortus chialingchiangensis-Glomospira vulgaris Zone of southern Sichuan.The Glomospira and Aulotortus communities have been established in this paper based on analysis of paleoecologic features and biofacies. Both communities are mostly developed in the envi ronment of platform bank rich in pores good for oil and gas storage.Therefore,the Aulotor tus chialingchiangensis-Dichospira sinensis fauna serves as a paleontological indication for oil and gas exploration.