西昆仑库地混杂岩带中深海浊积岩的浊积相划分及其特征

西昆仑库地混杂岩带中发育一套深海浊积岩。本文在系统的沉积相分析基础上,识别并划分出本区浊积岩的7类浊积相及14种亚相,结合其成因分别对各浊积相(亚相)的沉积特征、垂向分布规律进行了总结与描述。此外,垂向上还识别出3种浊积相组合,文中对其沉积序列特征及其所代表的环境意义进行了阐述。结合其它资料,探讨了这套浊流沉积的沉积环境,认为它形成于位于消减带和海沟之间的弧前盆地环境。

TURBIDITIC FACIES AND THEIR CHARACTERISTICS OF ABYSSAL TURBIDITES IN THE KUDA MELANGE BELT IN WEST KUNLUN, XINJIANG, CHINA

A set of abyssal turbidites in the Kuda melange belt of west Kunlun were studied in details along two sections of Yixikegou, northwest of Kuda, and the Xinjiang-Xizang road nearby the milestone of 139 km. The sedimentary characteristics of the turbidite suite were summarized. On the basis of the sedimentary facies analysis from the two sections mentioned above, 7 classes and 14 subfacies of the turbidite suite were recognized, and their sedimentary characteristics summarized and described combining with their genetic explanation, respectively. Further more, 3 kinds of turbidite facies associations which indicated two different sub-environments of a turbidite fan were recognized and analyzed in the vertical sequence of the two sections, with their sedimentary environments being discussed. Combined with the analysis of the other sedimentary characteristics and tectonic backgrounds, it was concluded that this turbidite suite was fromed in a fore-arc basin.