关于碳酸盐岩滑动流及其沉积特征的探讨

DISCUSSION ON SLIDING FLOW OF CARBONATE AND ITS DEPOSITIONAL CHARACTERISTICS

王一刚

Wang Yigang

石油工业部四川石油管理局

The Petroleum Administration of Sichuan, Ministry of Petroleum Industry

黔南桂西早三叠世斜坡相沉积物中,各种类型的碳酸盐岩重力流沉积物非常发育。其中常常见到与颗粒流、泥石流沉积物的结构、构造迥然不同的粗碎屑重力流沉积物。这类沉积物灰泥基质含量极少,砾石含量高,分选极差,具有明显的颗粒长轴定向组构和一系列滑动沉积标志。这些特征表明,沉积物既不是由颗粒碰撞产生的分散应力起支撑作用的颗粒流产物,也不是由具有一定强度的灰泥基质起支撑作用的泥石流沉积物。

There develops a suit of conglomeratic carbonate sediments of gravitational flow origin in the slope facies zone of the early Triassic from southern Guizhou to western Guangxi. This kind of sediments contains a little calcareous clay matrix and pressolution phenomena are developed among the gravels. The sorting of the gravels is poor and the grains are orientationally arranged indicating sliding sedimentation. Judging from the facts observed in the fields and the results of laboratory experiments, we come to a conclusion that this kind of sediments must be resulted from massive flow caused by the sliding among gravels owing to the "lubricating and resistance reducing" effects of the small amount of calcareous mud matrix. On this basis, it is inferred as sediments of sliding flow and a preliminary study has been made on the origin and the supporting mechanism of the sliding flow. This paper also proposes that the carbonate sediments of sliding flow is a special indicator of carbonate slope facies.

https://doi.org/10.11781/sysydz198401018