干旱区生态环境知识资源中心(Arid): Holocene sedimentology in an isolation basin in the Larsemann Hills, East Antarctica

Arid

DOI	10.1016/j.polar.2021.100729
	Holocene sedimentology in an isolation basin in the Larsemann Hills, East Antarctica
	Mahesh, B. S.; Nair, Abhilash; Ghadi, Pooja; Warrier, Anish Kumar; Mohan, Rahul
通讯作者	Mahesh, BS (corresponding author), Natl Ctr Polar & Ocean Res, Antarctic Sci, Vasco Da Gama 403804, Goa, India.
来源期刊	POLAR SCIENCE
ISSN	1873-9652
EISSN	1876-4428
出版年	2021
卷号	30
英文摘要	Holocene paleoenvironmental changes along the East Antarctic margin have been reconstructed using marine and lake sediment cores. Isolation basins in the coastal ice-free regions offer continuous sedimentary sequences to reconstruct marine-freshwater transitions and its environmental changes. In this study, we present the grain size (sand-silt-clay) and organic matter variations in a 51 cm radiocarbon-dated sediment core from Pup Lagoon, an isolation basin in Larsemann Hills (East Antarctica). The sediment core spans the last 6109 years and provides information on environmental changes in two different settings, i.e., (a) under the marine influence, and (b) as an isolated lake. Three cluster zones were identified viz., LZ1 (6109-2427 y BP: marine environment), LZ2 (2427-2101 y BP: transition zone) and LZ3 (2101-116 y BP: freshwater environment). Fine grain sediments (silt) are dominant in LZ1, indicating a strong hydrodynamic energy conditions affected by tidal currents with low organic matter. Higher sand content during the transition period (LZ2) indicates the strongest hydrodynamic condition and sediment deposition from sea ice. The increasing trend of OM (cyanobacterial benthic mat) beginning at similar to 2101 y BP suggests the isolation of the lake. The highest fine grained sediments (silt-clay) in LZ3 suggests lowered meltwater derived detritus in response to mild austral summer conditions during the Late Holocene.
英文关键词	Paleoenvironmental changes Particle size Lake sediment Larsemann hills East Antarctica
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000729943900002
WOS关键词	PRYDZ BAY-REGION ; GRAIN-SIZE ; LAKE-SEDIMENT ; DEPOSITIONAL ENVIRONMENT ; SCHIRMACHER OASIS ; RADIOCARBON ; CALIBRATION ; HISTORY
WOS类目	Ecology ; Geosciences, Multidisciplinary
WOS研究方向	Environmental Sciences & Ecology ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/373997
作者单位	[Mahesh, B. S.; Nair, Abhilash; Mohan, Rahul] Natl Ctr Polar & Ocean Res, Antarctic Sci, Vasco Da Gama 403804, Goa, India; [Warrier, Anish Kumar] Manipal Acad Higher Educ, Ctr Climate Studies, Dept Civil Engn, Manipal Inst Technol, Manipal 576104, Karnataka, India; [Ghadi, Pooja] Goa Univ, Sch Earth Ocean & Atmospher Sci SEOAS, Taleigao Plateau 403206, Goa, India
推荐引用方式 GB/T 7714	Mahesh, B. S.,Nair, Abhilash,Ghadi, Pooja,et al. Holocene sedimentology in an isolation basin in the Larsemann Hills, East Antarctica[J],2021,30.
APA	Mahesh, B. S.,Nair, Abhilash,Ghadi, Pooja,Warrier, Anish Kumar,&Mohan, Rahul.(2021).Holocene sedimentology in an isolation basin in the Larsemann Hills, East Antarctica.POLAR SCIENCE,30.
MLA	Mahesh, B. S.,et al."Holocene sedimentology in an isolation basin in the Larsemann Hills, East Antarctica".POLAR SCIENCE 30(2021).