Acta Metallurgica Sinica
Previous Articles Next Articles
YU Haiyue,LIU Junlong,HAO Yunqing,SUN Wei,LIU Ling
Online:
Published:
Abstract: The Middle Jurassic Shaximiao Formation in the piedmont zone of the Longmen Mountain Trust Belt (LMTB) consists of a set of alluvial deposits, including alluvial fan and braided river delta. Based on the theory of high-resolution sequence stratigraphy, we studied sand-body types of alluvial deposits in the piedmont zone by a comprehensive analysis of outcrop profiles, seismic section, seismic amplitude image, core, and drilling data, summarized its vertical stacking patterns as well as horizontal distribution characteristics. The results show that channel and sheet-like bar constitute the main sand-body types and channels are generally well developed; Provenance and lake level changes are two important factors of sand-body distribution. Provenances affect sand-body distribution of channels and lake level changes affect sand-body distribution of sheet-like bar and physical property of channels; four types of sand-body superimposed patterns of different origins were classified, i.e., superimposed glutenite-body of channels in the ultra-low accommodation, superimposed sand-body of channels in the low accommodation, superimposed sand-body of channels in the high accommodation, and superimposed sand-body of channels and sheet-like bars in the high accommodation, respectively.
Key words: alluvial deposits, sand-body type, sand-body distribution, the piedmont zone of the Longmen Mountain Trust Belt; Shaximiao formation, Jurassic
YU Haiyue,LIU Junlong,HAO Yunqing,SUN Wei,LIU Ling. Sand-body Distribution and Superposed Patterns of Alluvial Deposits in the Middle Jurassic in the Piedmont Zone of the Longmen Mountain Trust Belt[J]. Acta Metallurgica Sinica.
0 / / Recommend
Add to citation manager EndNote|Ris|BibTeX
URL: https://geology.nju.edu.cn/EN/
https://geology.nju.edu.cn/EN/Y2019/V25/I3/389