Vertical stratigraphic variations and sedimentation model of the Lower Siwalik sequence in Kumaun Himalaya, India

IF 0.2 Q4 GEOLOGY

Journal of Himalayan Earth Sciences Pub Date : 2008-09-23 DOI:10.3126/HJS.V5I7.1324

Uk Shukla, D. Bora

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Abstract

HIMALAYAN JOURNAL OF SCIENCES | VOL. 5 | ISSUE 7 (SPECIAL ISSUE) | 2008 143 Lower Siwalik sequence of Kumaun Himalaya is about 300– 900 m thick and shows characteristic stratigraphic changes in sedimentation pattern. Available magnetostratigraphic dates indicate Late Miocene age. Based on detailed facies analysis four depositional settings are identified namely Sandstone Succession (Channel deposits), Mudstone Succession (Floodplain deposits), Mottled Mudstone Succession (Palaeosols), and Mottled Siltstone Succession (Interfluve deposits). Stratigraphic succession shows systematic changes of facies association, palaeocurrent and petrography and palaeochannel patterns. Starting from base, about 500 m thick, coarsening upward Megacycle A is internally made up of two Mesocycles I and II. The sequence is made up of meandering and anastomosing rivers towards the base (Mesocycle I) that gradually evolve into braided towards top (Mesocycle II). This megacycle indicates sedimentation in a narrow subsiding basin by prograding mega fans. The Megacycle evolved under initially more pronounced tectonic activation in the source Vertical stratigraphic variations and sedimentation model of the Lower Siwalik sequence in Kumaun Himalaya, India

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印度Kumaun喜马拉雅地区下Siwalik层序垂向地层变化及沉积模式

喜马拉雅科学| VOL. 5 |第7期(特刊)| 2008 143 Kumaun喜马拉雅下Siwalik层序厚度约为300 ~ 900 m，具有典型的沉积模式地层变化特征。现有的磁地层年代为晚中新世。通过详细的相分析，确定了砂岩序(河道沉积)、泥岩序(河漫滩沉积)、斑驳泥岩序(古溶洞沉积)和斑驳粉砂岩序(河间沉积)4种沉积背景。地层演替显示出相组合、古流岩学和古河道格局的系统变化。从基部开始，大约500米厚，向上变粗，Megacycle A内部由两个Mesocycles I和II组成。该层序由向底部弯曲、吻合的河流(中旋回ⅰ)逐渐演化为向顶部辫状河流(中旋回ⅱ)组成。该巨旋回表明巨型扇在一个狭窄的沉降盆地中推进沉积。印度Kumaun喜马拉雅地区下Siwalik层序源区垂向地层变化与沉积模式表明，该巨旋回是在最初较为明显的构造活动下演化的

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来源期刊

Journal of Himalayan Earth Sciences GEOLOGY-

CiteScore

0.70

自引率

0.00%

发文量

期刊介绍： The "Journal of Himalayan Earth Sciences" (JHES) is a biannual journal, managed by the National Centre of Excellence in Geology, University of Peshawar, Pakistan. JHES is recognized by Higher Education Commission (HEC), Pakistan in "X" Category. The JHES entertains research articles relevant to the field of geosciences. Typical geoscience-related topics include sedimentary geology, igneous, and metamorphic geology and geochemistry, geographical information system/remote sensing related to natural hazards, and geo-environmental issues and earth quake seismology, and engineering and exploration geophysics. However, as the journal name implies, the articles addressing research relevant to the above disciplines in the Himalayan region will be given prime importance and relevance.