[논문]Channel-fill Deposits of Gravel-bed Stream, Southeastern Eumsung Basin (Cretaceous), Korea

Ryang, Woo-Hun

Channel-fill Deposits of Gravel-bed Stream, Southeastern Eumsung Basin (Cretaceous), Korea 원문보기

한국지구과학회지 = Journal of the Korean Earth Science Society, v.27 no.7, 2006년, pp.757 - 767

Ryang, Woo-Hun (Division of Science Education)

Abstract ▼ AI-Helper

Alluvial-plain deposits in the southeastern part of the Eumsung Basin (Cretaceous) are characterized by coarse-grained channel fills encased in purple siltstone beds. It represents distinct channel geometry, infill organization, and variations in facies distribution. The directions of paleocurrent, sedimentary facies changes, and channel-fill geometry can be used to reconstruct a channel network in the alluvial system developed along the southeastern margin of the basin. The channel-fill facies represent downstream changes: 1) down-sizing and well-sorting in clast and martix of channel fills and 2) internal organization of scour fill or gravel lag and overlying cross-stratified, planar-stratified beds. These findings suggest multiple stages of channel-filling processes according to flooding and subsequent stream flows. In the small-scale pull-apart Eumsung Basin (${\sim}7{\times}33km^2$ in area), vertical-stacked alluvial architecture of the coarse-grained channel fills encased in purple siltstone is expected to result from episodic channel shifting under a rapidly subsiding setting.

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문제 정의

This study is concerned with the Dootasan Sequence in the southeastern part of the basin. According to the paleocurrent data of threedimensional exposures, clast size, and composition, the Dootasan Sequence was largely derived from the southeastern margin where calc-alkaline volcanics are present along the basin margin (Fig.
In addition, threedimensional sections along the southeastern basin margin provide rare opportunities for the study of channel-filling processes in alluvial gravel-bed streams. This study may help understand factors that control downstream-changing alluvial channels in a small-scale strike-slip basin.

가설 설정

Interpretation: Purple siltstone are indicative of subaerial exposure. Green-gray mudstone were formed in subaqueous lacustrine environments when smallscale lake was formed or base level rose toward the basin margin.
Interpretation: The conglomerate fills were probably formed by multiple stage deposition such as scour fill or gravel lag by flooding and subsequent infilling by stream flows. The presence of lateral grain-size variation, coarse-grained openwork fabric, and the upward-fining of the hollow fills can be explained by deposition from waning floods and subsequent reworking/winnowing by stream flows.
Interpretation: The sheetlike geometry is indicative of less confined ephemeral flows. Some symmetrically scoured hollows suggest that the channels acted as distributive or crevasse-splay channel systems.

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