二连盆地阿南油田阿三油组火山碎屑沉积成因探讨

阿南油田阿三油组合有极为丰富的火山碎屑沉积。既有物源区早期形成的火山岩系的风化产物,又有同沉积火山喷发的火山碎屑,它们经流水等搬运至阿南古湖中沉积,且具有各自的特色。经研究认为,本区火山碎屑沉积中,前者为二次沉积或火山陆源碎屑沉积,后者包括火山碎屑重力流、水携型及空中降落灰沉积等三种成因类型。

ORIGIN OF SEDIMENTION OF VOLCANIC DETRITUS IN A''''NAN OIL FIELD OF ERLIAN BASIN

There arc abundant volcanic detritai sediments in A'nan oil group of A'nan oil field,including weathering products of early volcanic rocks and the volcanic detritus from volcanic eruption and contemporaneous deposition,which were carried to the ancient lake in A'nan district and deposited with specific features.Ths sedimsntation of the former was caused by double-deposition of volcanic detritus.The sedimentation of the latter was caused by deposition of volcanic detritus by gravity,deposition of volcanic detritus carried by water flow ar,d deposition of airborne volcanic dust.