干旱区生态环境知识资源中心(Arid): Mid to Late-Holocene environmental dynamics recorded in Lake Pup Lagoon, East Antarctica: Insights from environmental magnetism and biogeochemical proxies

Arid

DOI	10.1177/09596836241266424
	Mid to Late-Holocene environmental dynamics recorded in Lake Pup Lagoon, East Antarctica: Insights from environmental magnetism and biogeochemical proxies
	Noronha-D'Mello, Cheryl A.; Nair, Abhilash; Mahesh, B. S.; Warrier, Anish K.; Mohan, Rahul
通讯作者	Noronha-D'Mello, CA
来源期刊	HOLOCENE
ISSN	0959-6836
EISSN	1477-0911
出版年	2024
英文摘要	Paleoenvironmental archives in East Antarctica have revealed significant changes during the Holocene, marked by ice sheet retreat leading to the isolation of submarine basins. These basins offer valuable insights into past climate, glaciology, and oceanography shifts that impact sedimentary processes. In this study, environmental magnetism and biogeochemical proxies to investigate the Mid-to-Late-Holocene transitions in Pup Lagoon, a coastal isolation basin is presented. Our findings reveal distinct stratigraphic zones reflecting shifts from marine to lacustrine environments. The results reveal predominant mechanical weathering in the Stornes region, producing coarse-grained soft ferrimagnetic minerals. Notably, a period of warm oceanographic conditions between 6000 and 4722 cal. yr BP was characterized by mixed magnetic grain sizes and ultrafine superparamagnetic grains, indicating relatively oxic open waters in the basin. Subsequent shifts to reducing conditions coincide with persistent marine sea ice cover from 4722 to 2634 cal. yr BP, favoring the retention of coarse-grained ferrimagnets. Finer magnetic grain sizes between 2634 and 2185 cal. yr BP was attributed to the increased freshwater inputs associated with the Mid-Holocene Hypsithermal. Further, diagenetic changes under persistent sea ice cover between 2185 and 1970 cal. yr BP led to the selective dissolution of fine-grained ferrimagnets. Transitioning to freshwater isolated basin conditions between 1970 and 588 cal. yr BP, fine ferrimagnet precipitation indicate oxic to suboxic conditions alongside drier conditions. Biogenic productivity increased post-isolation, which was reflected in increased (Total Organic Carbon) TOC and (Total Nitrogen) TN percentages. Additionally, the presence of greigite in the isolated phase sediment indicates reducing conditions owing to organic matter decomposition. Notably, chi fd% exhibits an inverse trend to sea ice concentration, potentially indicating anoxic-dysoxic conditions due to the presence of sea ice. These observations align with broader regional sea ice concentration changes, emphasizing the interconnected behavior of local and regional factors shaping Antarctic coastal environments.
英文关键词	East Antarctica lakes environmental magnetism Holocene sediment isolation basin
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001281799700001
WOS关键词	ICE-SHEET RETREAT ; LARSEMANN HILLS ; PRYDZ BAY ; PALEOLIMNOLOGICAL CHANGES ; SCHIRMACHER OASIS ; CLIMATE HISTORY ; SEDIMENTS ; MARINE ; SEA ; CORE
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/2XILL650/404054
推荐引用方式 GB/T 7714	Noronha-D'Mello, Cheryl A.,Nair, Abhilash,Mahesh, B. S.,et al. Mid to Late-Holocene environmental dynamics recorded in Lake Pup Lagoon, East Antarctica: Insights from environmental magnetism and biogeochemical proxies[J],2024.
APA	Noronha-D'Mello, Cheryl A.,Nair, Abhilash,Mahesh, B. S.,Warrier, Anish K.,&Mohan, Rahul.(2024).Mid to Late-Holocene environmental dynamics recorded in Lake Pup Lagoon, East Antarctica: Insights from environmental magnetism and biogeochemical proxies.HOLOCENE.
MLA	Noronha-D'Mello, Cheryl A.,et al."Mid to Late-Holocene environmental dynamics recorded in Lake Pup Lagoon, East Antarctica: Insights from environmental magnetism and biogeochemical proxies".HOLOCENE (2024).