地质通报2016，Vol.35Issue(2)：424-432,9.
鄂尔多斯盆地西南部延长组长7段浊积岩沉积特征
Sedimentary characteristics of turbidite of Chang 7 member in southwestern Ordos Basin
摘要
Abstract
Based on outcrops, cores and grain size analyses, the authors studied systematically sedimentary characteristics of turbidite of Chang 7 member in southwestern Ordos Basin. The results show that turbidites are sub-angular lithic feldspar sandstone with low compositional maturity and textural maturity. The turbidites exhibit typical turbidite particle size distribution. The sedimentary struc⁃tures include graded bedding, flute cast, delve mold, gravity cast and collapse, and the common Bouma of turbidite sequences includes AB, ABC, ADE and AE. Hackberry facies can be divided into three sedimentary subfacies, i.e., the upper fan, mid fan, outer fan as well as relative sedimentary microfacies such as main groove and braided groove, and the upper fan and mid fan are main bodies of the turbidite with a wide distribution range. During the evolution of paleogeography, turbidites were small during Chang 73 stage of Chang 7 member. With the weakening of lake invasion and the retreat of the deep lake line, turbidites were developed gradually from Chang72-Chang71 and were distributed along Huachi-Qingcheng-Heshui area. Topography of the lake basin, source supply and tectogenesis seem to have been the important factors influencing formation and distribution of turbidites.关键词
鄂尔多斯盆地西南部/长7段/浊积岩/沉积特征Key words
southwestern Ordos Basin/Chang 7 menber/turbidite/sedimentary characteristics分类
天文与地球科学引用本文复制引用
郝松立,李兆雨,李文厚..鄂尔多斯盆地西南部延长组长7段浊积岩沉积特征[J].地质通报,2016,35(2):424-432,9.基金项目
国家自然科学重点基金项目 （）
