Transformation from Turbidity Current to Contour Current

Abstract

Abstract: The small cross lamination, the large vertical cross-bed and the glutinous cross-bed dould not exist in the sedimentary system. The conclusion from all the sedimentary characters of B, C, D and E segments is that the grains for forming these segments are transported by the tractive current in the last stage or before the sedimentation, not formed by turbidity current. The turbidite deposit is simply gravity current deposit in A segment, which is converted into contour current in B, C, D and E segments, hence being widely developed and dominant in the late stage of the turbidity current. In this paper, the clastic sediments and types of Lashizhong formation of Middle Ordovician in Zhuozishan area in Inner Mogolia are presented in view of sedimentary facies, facies family, paleo-current direction and the ecologic features of fossil ichnocoenosis. And the identified clastic contourite indicates that no Bouma sequence occurs in this formation.

Key words: Inner Mongolia, deposit, sedimentation, turbidity current, contour current, clastic rock, origin

CLC Number:

TE111.3

DING Hai-jun, XU Huan-hua. Transformation from Turbidity Current to Contour Current[J]. Xinjiang Petroleum Geology, 2009, 30(1): 87-91.

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