中国石油大学学报（自然科学版）2017，Vol.41Issue(4)：46-53,8.DOI:10.3969/j.issn.1673-5005.2017.04.006
鄂尔多斯盆地延长组深水块状砂岩"泥包砾"结构成因机制
Genetic mechanism of mud-coated intraclasts within deep-water massive sandstone in Yanchang Formation, Ordos Basin
摘要
Abstract
The genetic mechanism of mud-coated intraclasts within deep-water massive sandstone in Yanchang Formation of Ordos Basin was studied combining the test method of element geochemistry, XRD and rock thin section analysis. The find-ings of this study include the following:the Fe/Mn is low, the content of MnO2 is high, Th/U is high, theδU is less than 1, and the Sr/Ba is low in the argillaceous cladding layer, reflecting the geochemistry characteristics of shallow water environ-ment are nearshore, oxidation and low salinity. There is a large difference in depositional environment with the associated layered mudstone of the semi-deep lake. The main components of the core of the mud-coated intraclasts are sandy, muddy or dolomitic lump, which were formed in shore-shallow lake or delta front environment. The formation process of mud-coated in-traclasts was long, in which the soft sandy or muddy sediments within the delta front were transported into deep lakes in clumps from Chang7 to Chang63 period through four stages:lump formation of shallow lake facies, initial formation of struc-ture, mixed transfer of lithology and eventually deposition setting.关键词
"泥包砾"结构/延长组/沉积环境/地球化学/深水沉积/鄂尔多斯盆地Key words
mud-coated intraclasts/Yanchang Formation/sedimentary environment/geochemistry/deep-water sedimentary/Ordos Basin分类
能源科技引用本文复制引用
廖建波,李相博,赵惠周,张晓磊,李智勇,完颜容,王菁..鄂尔多斯盆地延长组深水块状砂岩"泥包砾"结构成因机制[J].中国石油大学学报（自然科学版）,2017,41(4):46-53,8.基金项目
国家科技重大专项 (2011ZX05001-003) （2011ZX05001-003）
