川西中三叠统天井山组风暴沉积的发现及古地理意义

笔者首次发现川西地区中三叠统天井山组（T2t）中有大量的风暴岩。其中包含许多典型的与风暴相关的沉积构造．包括冲刷一充填构造、粒序层理和块状层理、丘状和凹状交错层理、扁平砾屑岩层等。该区风暴岩有6种沉积层序，Ⅰ型、Ⅱ型层序为远源风暴岩，Ⅲ型、Ⅳ型、Ⅴ型和Ⅵ型层序为近源风暴岩。风暴岩的区域展布差异和广泛分布表明，拉丁期上扬子西缘处于风暴活动频繁的低纬度陆棚缓坡沉积环境。天井山组风暴岩是四川盆地的一种新型储层。

Discovery of tempestite in Middle Triassic Tianjingshan Formation in western Sichuan and its paleogeographic significance

Tempestites have been found for the first time in the Middle Triassic Tianjingshan Formation in western Sichuan. The tempestites contain many typical sedimentary structures originated from storm activities, such as scourinfill structure, graded bedding, massive bedding, hummocky cross stratification, sunken cross stratification and flat rudites. The tempestites have 6 types of sedimentary sequences, among them, type Ⅰ and type Ⅱ are distal tempestite, while type Ⅲ, Ⅳ, Ⅴ and Ⅵ are proximal tempestite. The wide distribution and differences in regional distribution of tempestites indicate that the sedimentary environment of the western margin of Yangtze Block during Ladinian stage might be a ramp of low latitudes where the storm activities were frequent. The tempestite of Tianjingshan Formation is a new kind of reservoir in Sichuan Basin.