干旱区生态环境知识资源中心(Arid): Mid-late Holocene fluvial aggradational landforms and morphometric investigations in the southern front of the Shillong plateau, NE India

Arid

DOI	10.1007/s12040-019-1130-9
	Mid-late Holocene fluvial aggradational landforms and morphometric investigations in the southern front of the Shillong plateau, NE India
	Imsong, Watinaro 1; Choudhury, Swapnamita 2; Phukan, Sarat 3
通讯作者	Imsong, Watinaro
来源期刊	JOURNAL OF EARTH SYSTEM SCIENCE
ISSN	2347-4327
EISSN	0973-774X
出版年	2019
卷号	128 期号:5
英文摘要	The present study is an attempt to understand the antiquity of the preserved fluvial landforms and its response to the climate-tectonics nexus through geomorphological investigations along the Jadukata, Umpung, Umngot and Umtongoi rivers in the southern front of the Shillong plateau (SP), NE India. Sedimentological characteristics, chronological analyses and morphotectonic parameters were used to describe the spatial and temporal variability in the patterns of aggradation, landform evolution and neotectonic influences in the study. Our results indicate that valley aggradation processes occurred around the transitional zone in the southern front of the SP during the mid-late Holocene era along with a hiatus in sediment deposition after 4.3 ka. Sediment generation and aggradation is modulated by precipitation anomalies associated with the Indian Summer Monsoon (ISM) variability whereas morphometric analysis suggests that activity along the Dauki-Dapsi fault has been contributing to the uplift-related deformation. Sedimentological observation supported by optically stimulated luminescence chronology obtained on palaeoflood deposits, valley-fill fluvial terraces and alluvial fans indicate their deposition during three pluvial phases: (i) 5.3-4.3 ka, (ii) 2.4-1.0 ka and (ii) 0.7-0.3 ka. Our data indicate that valley aggradation and geomorphic processes in the southern part of SP responded to short-term changes in the ISM variability with contributions from the morphotectonic activities associated with the Dauki-Dapsi fault during the late Holocene period.
英文关键词	Shillong plateau landforms alluvial succession Indian summer monsoon morphotectonics Dapsi-Dauki fault
类型	Article
语种	英语
国家	India
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000468690800005
WOS关键词	LAKE SEDIMENT RECORD ; MEGHALAYA PLATEAU ; LATE QUATERNARY ; NORTHEAST INDIA ; SUMMER MONSOON ; OROGRAPHIC PRECIPITATION ; TERRACE FORMATION ; CENTRAL HIMALAYA ; TIBETAN PLATEAU ; THAR DESERT
WOS类目	Geosciences, Multidisciplinary ; Multidisciplinary Sciences
WOS研究方向	Geology ; Science & Technology - Other Topics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216921
作者单位	1.Nagaland Univ, Dept Geol, Kohima 797001, India; 2.Wadia Inst Himalayan Geol, Dehra Dun, India; 3.Gauhati Univ, Dept Geol Sci, Gauhati, Assam, India
推荐引用方式 GB/T 7714	Imsong, Watinaro,Choudhury, Swapnamita,Phukan, Sarat. Mid-late Holocene fluvial aggradational landforms and morphometric investigations in the southern front of the Shillong plateau, NE India[J],2019,128(5).
APA	Imsong, Watinaro,Choudhury, Swapnamita,&Phukan, Sarat.(2019).Mid-late Holocene fluvial aggradational landforms and morphometric investigations in the southern front of the Shillong plateau, NE India.JOURNAL OF EARTH SYSTEM SCIENCE,128(5).
MLA	Imsong, Watinaro,et al."Mid-late Holocene fluvial aggradational landforms and morphometric investigations in the southern front of the Shillong plateau, NE India".JOURNAL OF EARTH SYSTEM SCIENCE 128.5(2019).