干旱区生态环境知识资源中心(Arid): Changing the paleo-depositional environment in the last 2300 years: a study through sedimentology and geochemistry of a sediment core, western Bay of Bengal

Arid

DOI	10.1007/s12665-020-09321-8
	Changing the paleo-depositional environment in the last 2300 years: a study through sedimentology and geochemistry of a sediment core, western Bay of Bengal
	Kangane, Janhavi; Nayak, Ganapati N.; Tiwari, Anoop Kumar; Saalim, S. M.
通讯作者	Nayak, GN (corresponding author), Goa Univ, Sch Earth Ocean & Atmospher Sci, Marine Sci, Taleigao 403206, Goa, India.
来源期刊	ENVIRONMENTAL EARTH SCIENCES
ISSN	1866-6280
EISSN	1866-6299
出版年	2021
卷号	80 期号:1
英文摘要	The sediment core collected at a water depth of 260.2 m off Mahanadi, western Bay of Bengal was analyzed for grain size fractions, clay minerals, and major and trace elements to understand changing depositional environments, source and processes with time, from similar to 2300 cal yr before present (BP) to the year of the collection (2014). Age was estimated using accelerator mass spectrometer (AMS) C-14 dates of two planktonic foraminifera samples. The core was divided into six distinct zones based on the significant changes in the sediment components and clay minerals. The presence of higher than average clay and smectite and lower silt and illite, in Zone II (2000 years BP-1070 cal yr BP) and Zone V (300-130 cal yr BP) revealed their deposition in low energy conditions, while, Zone III (1070 to 530 cal yr BP) and Zone VI (132 cal yr BP to present) exhibited higher silt and illite and lower clay and smectite than average suggesting their deposition in a high energy environment. Similar depositional environments observed between Zones II and V and also between Zones III and VI indicated the reoccurrence of similar hydrodynamic conditions with time. Zone II represents the Roman Warm Period and part of the early Medieval Warm Period, while, zone V corresponds to the retreating phase of the Little Ice Age. High Al in zone III and fluctuating trend in zone VI indicates higher Al release along with silt and illite from physical weathering in a cold and arid climate, while, smectite showed a positive correlation with Ti indicating the source of Ti and smectite as basic igneous rocks released during the enhanced southwest monsoon and warm climate. Mn and Zn distribution revealed fluctuations in the Oxygen Minimum Zone (OMZ) intensity to changing hydrodynamic conditions and depositional environments. The present study revealed changing depositional environments in the western Bay of Bengal with time with respect to changing material influx, reflecting fluctuating monsoons and climate.
英文关键词	Depositional environment Hydrodynamic conditions Paleoclimate Sediment core Bay of bengal
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000606914700003
WOS关键词	TRACE-ELEMENT GEOCHEMISTRY ; CLAY-MINERALS ; MONSOON VARIABILITY ; SURFACE SEDIMENTS ; ATLANTIC-OCEAN ; ARABIAN SEA ; RIVER ; BASIN ; CLIMATE ; PROVENANCE
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/347852
作者单位	[Kangane, Janhavi; Nayak, Ganapati N.] Goa Univ, Sch Earth Ocean & Atmospher Sci, Marine Sci, Taleigao 403206, Goa, India; [Tiwari, Anoop Kumar; Saalim, S. M.] Natl Ctr Polar & Ocean Res, Vasco Da Gama, Goa, India
推荐引用方式 GB/T 7714	Kangane, Janhavi,Nayak, Ganapati N.,Tiwari, Anoop Kumar,et al. Changing the paleo-depositional environment in the last 2300 years: a study through sedimentology and geochemistry of a sediment core, western Bay of Bengal[J],2021,80(1).
APA	Kangane, Janhavi,Nayak, Ganapati N.,Tiwari, Anoop Kumar,&Saalim, S. M..(2021).Changing the paleo-depositional environment in the last 2300 years: a study through sedimentology and geochemistry of a sediment core, western Bay of Bengal.ENVIRONMENTAL EARTH SCIENCES,80(1).
MLA	Kangane, Janhavi,et al."Changing the paleo-depositional environment in the last 2300 years: a study through sedimentology and geochemistry of a sediment core, western Bay of Bengal".ENVIRONMENTAL EARTH SCIENCES 80.1(2021).