高校地质学报2018，Vol.24Issue(2)：285-296,12.DOI:10.16108/j.issn1006-7493.2017106
桌子山地区中奥陶统克里摩里组深水等深流沉积模式
Depositional Model for Contourites the Kelimoli Formation,Middle Ordovician,Zhuozishan Area
摘要
Abstract
Contourite is an important sedimentary type of traction current deposits in a deep-water environment. Although there has been a lot of research on contourites, most studies focus on contour concurrent deposition in modern oceans by bathymetric investigation and deep-sea drilling (DSDP, ODP and IODP). Following the implementation of the IODP (Integrated Ocean Drilling Program)Expedition 339(The Mediterranean outflow),the study of contourites has reached a new stage for analyzing the vertical and lateral succession of contour drifts. However, there is still a great restriction on further study of contourites, especially on the depositional model for contour currents because of the big gap between modern sea floor and stratigraphic records. This article is focused on the ancient contour current deposits developed in the northwestern margin of the Ordos Basin,in Darriwilian Stage,Middle Ordovician.Sedimentology analysis based on the detailed field work in shixiagu section,Hainan area in Wuhai city of Inner Mongolia allows us to differentiate three vertical successions, i.e., the medium-to thin-bedded amalgamated limestone, the alternation of limestone-mudstone unit and mudstone,and the striation mudstone is the notable characteristics in the lower,middle,and upper part of the Kelimoli Formation, respectively. These three successions are proposed to represent the deposits of channel, levee, and basin in deep-water environments where contour currents dominate. Thus, a conceptual model of deep-water channel-levee system for the deposition of contour currents is developed from the geological records in the western Ordos Basin.关键词
等深流沉积/水道-天然堤体系/中奥陶统/鄂尔多斯盆地Key words
contour current deposition/channel-levee system/Middle Ordovician/Ordos Basin分类
天文与地球科学引用本文复制引用
李向东,阙易,郇雅棋..桌子山地区中奥陶统克里摩里组深水等深流沉积模式[J].高校地质学报,2018,24(2):285-296,12.基金项目
国家自然科学基金面上项目(41272119) （41272119）
昆明理工大学自然科学研究基金(KKSY201321008) （KKSY201321008）
云南省教育厅科学研究基金项目(2015Z030)联合资助 （2015Z030）
