塔西南考库亚泥盆系浪控陆棚和浪控三角洲微相

MICROFACIES OF WAVE-CONTROLLED SHELF AND DELTA IN DEVONIAN OF KOKEYA, SOUTHWEST TARIM

塔西南考库亚泥盘系为一向上变粗的浪控陆棚和浪控三角洲沉积层序。浪控陆棚相包括条痕泥、透镜层异粒岩、平行纹理和交错纹理砂岩、大型构造砂岩、贝壳粒屑层、珊瑚层、贝壳一核形石灰岩、亮晶鲕粒灰岩和生物屑灰岩等９种微相，以友绿色页岩、粉砂质页岩和泥岩为主，夹粉砂岩、砂岩、各种灰岩、珊瑚层和贝壳粒后层，富含腕足、腹足、瓣鳃、海百合、珊瑚、苔藓上等遗体化石和管枝迹等遗迹化石，具典型的浪成交错纹理和浪成波痕，反映早期为深水低能、晚期为浅水高能的沉积环境。浪控三角洲相包括前三角洲泥、席状砂、波状纹理粉砂岩、水下分流河道、近岸砂坝、海滩砂脊、分流河道、洪泛平原和支流问湾等９种微相，受波浪作用控制、具浪成波痕和浪成交错层理，显示典型的向海推进的层序。

The Devonian in Kokuya is a distinct coarsing-upward wave-controlled continental shelfto wave-controlled delta sequence. The wave-controlled continental shelf factes includes 9 microfacies as Streaky mud, lenticular allochemical rock, laminated and cross bedding sandstone, large cross bedding sandsone, shell debris oolitic sparite, bioclastic limestone micro facies. The wave-controlled delta factes include prodelta mud, sheet sandstone, current laminated siltstone, subaqueous distributary channel, littoral bar, beach dum, distributary channel, fload plain and branch-channel inlet micro factes. The characteristics of the above mentioned micro factes are described in this paper.