Abstract:

Kuluketage Trough is located at the northeast margin of Tarim Massif.The turbidity deposits of Ordovician System are found in Qiaoerqiaoke andNanyaerdang Mountains to the south of Xindi fault in the trough and havethe relict thickness of 1797.3-2761.0 m. The turbidity deposits can be divi-ded into marginal submarine fan and trough turbidity. The turbidite with Bou-ma Sequence is typical, whereas the lenticular or massive sandstone andgravelstone of fan channel deposits are not typical. The turbidity depositsare composed of three kinds in vertical-advanced, contracted and complex se-quences. Two complete turbidity cycles were developed in the Ordovician: thefirst one began with the advanced sequence of the submarine fan in the latestage of the Early Ordovician and ended with contracted sequence in the endof the Middle Ordovician;the second cycle which developed in the LateOrdovician began with the complex sequence of the advance-contracted sub-marine fan in the early stage and ended with the trough-basin turbidity inthe late stage.