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西藏改则盆地新生代陆相康托组地层发育,记录了青藏高原腹地始新世气候变化和隆升历史。本文通过对改则盆地中南部改则县嘎热村康托组剖面进行系统的采样和室内处理,获得363个介形类个体,共鉴定11属27种(包括1个未定种)。通过研究区介形类动物群的特征分子Heterocypris igneus及与东濮、渤海、华北、江汉等地区介形类动物群对比研究,认为康托组上部的沉积时代应为晚始新世。本文首次报道了改则盆地康托组的介形类动物群面貌,据介形类组合厘定了康托组沉积时代,为研究青藏高原腹地新生代地层提供了基础资料。
Stratigraphic development of the Cenozoic continental facrotect Formation in the Tazhong Basin, Tibet, recorded the history of Eocene climatic changes and uplift in the hinterland of the Qinghai-Tibet Plateau. In this paper, 363 Orthomorphic individuals were obtained by systematic sampling and indoor treatment of Kangtao Formation in Gage Village, Gazi Village, Gazi Village, central and southern Gandao Basin, and 27 species (including 1 undetermined species) of 11 genera were identified. Through the comparative study of the Heterocypris igneus, an Ostomorphic character group, and the Ostomorphic group in Dongpu, Bohai, North China and Jianghan, it is concluded that the Upper Cretaceous sedimentary age should be Late Eocene. This paper reports for the first time the appearance of the Ostracoda Group in the Cantuo Formation in the Qaidam Basin, and determines the sedimentary age of the Canto Formation according to the combination of the Ostracoda. It provides the basic data for the study of Cenozoic strata in the hinterland of the Qinghai-Tibet Plateau.