论文摘要
In order to comprehensive understand the sequence stratigraphic framework and spatial and temporal distribution of Xishanyao Formation in Southern Ili Basin, based on the highresolution sequence stratigraphy and sedimentology theory, we study the high-resolution sequence stratigraphy and sedimentary facies of Xishanyao Formation in the study area according to the outcrop profiles, drilling cores, geochemical data, well logging and seismic data. The results show that Xishanyao Formation can be divided into 2 long-term sequence cycles（LSC1-LSC2）, 3 Intermediate-term sequence cycles（MSC1-MSC3） by analyzing unconformity, scour surface and flooding surface. Meanwhile, 10 short-term sequence cycles（SSC1-SSC10） are further identified according to the sedimentary transformation surfaces and rhythm conversion surfaces. These SSC are subdivided into 3 basic types and 7 sub-types according to the stacking patterns and sedimentary facies of each sequence cycles. Deepening upward nonsymmetrical type（type A）, shallowing upward nonsymmetrical type（type B） and symmetrical type（type C） are 3 basic types of high-resolution sequence stratigraphy. MSC and LSC are mainly featured with Type C and Type A only develops in the SSC. The strata in the whole study area are characterized with multi-cycle of base level mostly having ascending and descending half cycles during each MSC and LSC and only ascending half cycle during the SSC1, SSC2, SSC7 and SSC10. The uranium mineralization is prone to enrich at the bottom of the ascending half cycle（SSC1-SSC2）. They consist of stacked（underwater） distributary channel sand bodies of different periods, which are the main exploration targets of sandstone-type uranium deposits.
论文目录
文章来源
类型: 国际会议
作者: NI Shiqi,SONG Jiye,ZHANG Xiao,LI Zhenzhen
来源: 第九届世界华人地质科学研讨会 2019-06-01
年度: 2019
分类: 基础科学,工程科技Ⅰ辑
专业: 地质学,矿业工程
单位: Beijing Research Institute of Uranium Geology
分类号: P619.14
DOI: 10.26914/c.cnkihy.2019.028435
页码: 281
总页数: 1
文件大小: 92k
下载量: 1