河南留山盆地上三叠统沉积粒度分析

基金项目:

中石化重大前瞻性项目“华北西南部晚三叠世-新近纪岩相古地理研究与编图(CW800-07-2s-165-01)”

河南理工大学博士基金(648511)联合资助

Grain size analysis of the Upper Triassic deposits in the Liushan Basin,Henan

1. School of Resources and Environment Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China;
2. College of Geo-info Science and Engineering, Shandong University of Science and Technology, Qingdao 266510, Shandong, China

摘要: 通过留山盆地上三叠统概率累积曲线、粒度参数和C-M图解等分析,沉积物粒度特征主要反映了扇三角洲泥石流、水下分流河道和河口坝沉积。下部太山庙组显示了水流由强至弱,搬运能力逐渐减小的过程;上部太子山组显示出水流不稳,流速交替多变的特点。粒度特征也显示了紊流作用的强烈影响,而紊流作用的产生可能与快速水流以及较高的悬浮颗粒含量有关。
- 留山盆地 /
- 上三叠统 /
- 沉积环境 /
- 粒度分析
Abstract: Judged from grain size probability accumulative curves,grain size parameters and C-M patterns,the Upper Triassic deposits in the Liushan Basin are built up of the fan delta debris flow deposits,subaqueous distributary channel deposits and channel-mouth bar deposits.The Taishanmiao Formation in the lower part displays the evolution from the stronger flow to the weaker flow,while the Taizishan Formation in the upper part is characterized by unstable currents and varying flow velocity.The grain size parameters also indicate that intense turbulent flows may be closely related to the fast velocity of flows and higher contents of suspended particles.
- Liushan Basin /
- Upper Triassic /
- sedimentary environment /
- grain size analysis