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タイトル: Depositional facies and radiocarbon ages of a drill core from the Mekong River lowland near Phnom Penh, Cambodia: evidence for tidal sedimentation at the time of Holocene maximum flooding
著者: Tamura, Toru
Saito, Yoshiki
Sieng, Sotham
Ben, Bunnarin
Kong, Meng
Choup, Sokuntheara
Tsukawaki, Shinji link image link image
塚脇, 真二
発行日: 2007年 3月 1日
出版社(者): Elsevier
雑誌名: Journal of Asian Earth Sciences
ISSN: 1367-9120
巻: 29
号: 5-6
開始ページ: 585
終了ページ: 592
キーワード: Aggradation
Delta
Highstand Mud drapes
Peat
Regression
Sea-level rise
Transgression
抄録: The depositional facies and radiocarbon ages of a long Holocene sediment core (KS) from Cambodia are reported here to clarify the sedimentary environments of the Mekong River delta system at the time of Holocene maximum flooding by the sea. The 30.7-m-long KS core, from the upper Mekong River lowland about 20 km southeast of Phnom Penh, penetrated five depositional facies, A to E in ascending order. Facies A is cross-laminated fluvial sand. Facies B is laminated, very fine sand with mud drapes.Facies C to E are salt marsh, flood-plain and natural-levee deposits, characterized by a succession of peat, organic clay, and reddish brown silt. Facies B dates to 9.0 to 7.5 ka and is interpreted as aggradational tidal deposits, 16.5 m thick, deposited during a rapid rise of sea level; these deposits became overlain by an accumulation of salt marsh and flood-plain deposits during the subsequent period of slowly rising and then falling sea level. The maximum flooding surface lies in the Facies B interval. The presence of tidal deposits implies that the core site, about 230 km inland from the present river mouth, was near the shoreline and experienced strong tidal influences during the early Holocene.© 2006 Elsevier Ltd. All rights reserved.
URI: http://hdl.handle.net/2297/3767
関連URI: http://dx.doi.org/10.1016/j.jseaes.2006.03.009
http://www.elsevier.com/locate/issn/13679120
資料種別: Journal Article
出現コレクション:1. 査読済論文

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