干旱区生态环境知识资源中心(Arid): Assessing the climatically triggered aggradation-incision processes in a dryland environment during the Late Quaternary period from Shetrunji River basin (Saurashtra), India

Arid

DOI	10.1016/j.quaint.2020.07.007
	Assessing the climatically triggered aggradation-incision processes in a dryland environment during the Late Quaternary period from Shetrunji River basin (Saurashtra), India
	Solanki, Tarun; Prizomwala, S. P.; Makwana, Nisarg; Solanki, P. M.
通讯作者	Solanki, T (corresponding author), Gujarat Univ, Ahmadabad 380009, Gujarat, India.
来源期刊	QUATERNARY INTERNATIONAL
ISSN	1040-6182
EISSN	1873-4553
出版年	2021
卷号	585 页码:70-84
英文摘要	The present study is an attempt to infer the response of the dryland fluvial sequences to paleoenvironmental change since the last glacial maximum (LGM) from the semi-arid Saurashtra region, a basaltic terrain of the Late Cretaceous age (Deccan Trap), of Western India. We employed a conventional sedimentological analysis supported by sediment geochemistry, which was constrained by optical dating. Based on detailed field investigation, we identified five terrace sequences from the valley fill deposit in the Shetrunji River basin since 18 ka (i.e. Post LGM). The sedimentary archives expose the deposition during three alternate phases of aggradation and incision, marked on the basis of morphostratigraphy and timing of landform evolution. The coastal region of western India experienced a widespread valley aggradation in response to the rising sea stand and under gradual strengthening of the monsoonal conditions around the 18?9 ka period. The Early Holocene climatic optima (9-7.5 ka) coupled with lower than present but rising sea stand, triggered the intense erosion in the valleys of Shetrunji River basin, leading to erosion/lack of sediment preservation. This was followed by the Middle Holocene period (7.5-5 ka), which experienced valley aggradation. This was ended by the incision post 5.5 ka in the lower reaches of the Shetrunji River. The sea stand was similar to present-day stand, as evidenced by the change from fluvial to the estuarine environment in the top sequence of Site-SL at 5.5 ka. The Late Holocene relative sea stand lowering similar to 3 ka, led to an incision in the estuarine terrace of about 2 m. The causal mechanism for triggering of this incision is most likely the relative fall in sea stand to present-day level from its Middle Holocene high stand. The Late Holocene period (3-1 ka) shows aggradation in upper reach in fluctuating hydrodynamic conditions with seasonality, followed by a relatively good monsoonal condition at < 1 ka, leading to the incision due to climatetectonic interplay. These pulses of sedimentation could be recognized and explored as aided by basin-scale approach as in the present study. Site-specific studies do not enjoy such liberty.
英文关键词	Fluvial processes Dryland environment Aggradation Last glacial maxima Western India
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000640138500003
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/367786
作者单位	[Solanki, Tarun] Gujarat Univ, Ahmadabad 380009, Gujarat, India; [Solanki, Tarun; Prizomwala, S. P.; Makwana, Nisarg] Inst Seismol Res, Act Tecton Grp, Gandhinagar 382009, India; [Solanki, P. M.] MG Sci Inst, Dept Geol, Ahmadabad 380009, Gujarat, India
推荐引用方式 GB/T 7714	Solanki, Tarun,Prizomwala, S. P.,Makwana, Nisarg,et al. Assessing the climatically triggered aggradation-incision processes in a dryland environment during the Late Quaternary period from Shetrunji River basin (Saurashtra), India[J],2021,585:70-84.
APA	Solanki, Tarun,Prizomwala, S. P.,Makwana, Nisarg,&Solanki, P. M..(2021).Assessing the climatically triggered aggradation-incision processes in a dryland environment during the Late Quaternary period from Shetrunji River basin (Saurashtra), India.QUATERNARY INTERNATIONAL,585,70-84.
MLA	Solanki, Tarun,et al."Assessing the climatically triggered aggradation-incision processes in a dryland environment during the Late Quaternary period from Shetrunji River basin (Saurashtra), India".QUATERNARY INTERNATIONAL 585(2021):70-84.