西藏改则地区上三叠统亭共错组的建立及其意义

亭共错组是发育在羌南地块上的一套晚三叠世磨拉石建造，以浅灰-紫灰色杂色砾岩为主。夹少量灰色细-粗砂岩。总体为一套河床一边滩相沉积。在粉砂岩夹层中获植物化石Neocolamites carcinoides Harris，Neoca／am／tesn卿淞Sze，Neocalamites sp．，时代为晚三叠世。亭共错组的建立完善了上三叠统肖茶卡群的地层系统。亭共错组与下伏地层之间角度不整合关系的发现，为研究羌南地块向羌塘盆地转化的时限、藏北地区的印支运动和古特提斯的终结提供了直接依据。

Establishment and significance of the Upper Triassic Henggong Co Formation in the Gêrzê area, Tibet, China

The Henggong Co Formation is Late Triassic molasse occurring on the southern Qiangtang block. It consists predominantly of light gray-purplish gray variegated conglomerate with small amount of gray fine-coarse sandstone and is generally a sequence of river bed-point bar deposits. The fossil plants Neocolamites carcinoides Harris, Neocalamites rugosus Sze and Neocalamites sp. Obtained from the intercalation of siltstone are Late Triassic in age. The establishment of the Henggong Formation improves the stratigraphic system of the Upper Triassic Xo Caka Group and the discovery of the unconformity between the Henggong Formation and its underlying strata provides direct evidence for the study of the timing of transformation of the southern Qiangtang block to the Qiangtang basin and the termination of the Indosinian movement and Paleo-Tethys in northern Tibet.