深海相中的砂质碎屑流沉积--以西藏特提斯喜马拉雅侏罗-白垩系为例

阐述了砂质碎屑流沉积特征、研究现状及其与其他深海碎屑沉积的区别 ,认为西藏特提斯喜马拉雅上侏罗统 -下白垩统深海沉积背景下的块状砂岩具有砂质碎屑流沉积性质 ,指出深海相中的块状砂岩可以预测。

SEDIMENTION OF SANDY DEBRIS-FLOW IN DEEP-SEA ENVIRONMENT --Verification from massive sandstone of the Upper Jurassic-Lower Cretaceous in Tibetan Tethys Himalayas

Some properties and progresses of sandy debris flow are summarized in the paper, and the distinction of sandy debris flow from other deep sea debris such as turbidite, contourite, sediments of internal tide and internal wave is also made. It is proposed that massive sandstones in the upper Weimei Fm. of the Upper Jurassic and in the lower Jiabula Fm. of the Lower Cretaceous in Gyangze area of southern Tibet,which is located in the North Subzone of Tethys Himalayas, are caused by sandy debris flow in a deep sea environment. We suggest that the sandy debris flow can be identified in the field by means of checking the matrix components, floating mudrocks in sands, massive and reverse graded bedding; and studying the deep sea environment around it. It is necessary that a model of sandy debris flow is made in locality for oil gas exploration.