Lithofacies and depositional environment of the Siwalik Group in Samari-Sukaura River area, Central Nepal

Bulletin of The Department of Geology Pub Date : 2013-10-11 DOI:10.3126/BDG.V16I0.8884

Dev Kumar Syangbo, N. Tamrakar

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引用次数: 8

Abstract

Thick sedimentary sequence deposited in the foreland basin of the Nepal Himalaya is represented by the Siwalik Group. The Siwalik Group is well exposed in the Samari-Sukaura River area. The present study is focused in southern portion of the MBT around the Samari-Sukaura area for its depositional environment. The Middle Siwaliks of the Sukaura Road sections is overlained by the Lower Siwaliks which is separated by the Karki Khola Thrust. Extension of the Lower Siwaliks in the Jyamire Khola and the Bundal Khola becomes wider in the eastern Zone. Repetition of the Lower Siwaliks along the southern margin of the MBT is recognized. Depending on lithofacies assemblage and facies analysis, the two broad facies assemblages FA1 and FA2 have been distinguished. FA1 shows SB, FF, LA, LS and CH architectural elements and is interpreted as a product of the fine-grained meandering river system. FA2 shows SB, FF, LA, DA and CH architectural elements and is interpreted as a product of sandy mixed-load meandering river system. DOI: http://dx.doi.org/10.3126/bdg.v16i0.8884 Bulletin of the Department of Geology Vol. 16, 2013, pp. 53-64

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尼泊尔中部Samari-Sukaura河地区Siwalik群岩相及沉积环境

尼泊尔-喜马拉雅前陆盆地沉积的厚层序以Siwalik群为代表。Siwalik组在Samari-Sukaura河地区暴露良好。本研究主要集中在MBT南部Samari-Sukaura地区周围的沉积环境。Sukaura路段的中Siwaliks被下Siwaliks覆盖，下Siwaliks被Karki Khola逆冲分隔开。Jyamire Khola和Bundal Khola的下siwalik扩展在东部地区变得更宽。沿着MBT的南缘重复的下西沃利克是公认的。通过岩相组合和相分析，划分出FA1和FA2两大类岩相组合。FA1展示了SB, FF, LA, LS和CH建筑元素，并被解释为细粒度蜿蜒河流系统的产物。FA2展示了SB, FF, LA, DA和CH建筑元素，并被解释为砂质混载曲流水系的产物。DOI: http://dx.doi.org/10.3126/bdg.v16i0.8884地质部门公报第16卷，2013年，第53-64页

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Bulletin of The Department of Geology

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