Postglacial marine environmental changes in Maxwell Bay, King George Island, West Antarctica SCIE SCOPUS

Cited 16 time in WEB OF SCIENCE Cited 17 time in Scopus
Title
Postglacial marine environmental changes in Maxwell Bay, King George Island, West Antarctica
Author(s)
Khim, BK; Yoon, HI
Publication Year
2003
Abstract
Sediment textural properties and total organic carbon (TOC) contents of three sediment cores from Maxwell Bay, King George Island, West Antarctica, record changes in Holocene glaciomarine sedimentary environments. The lower sedimentary unit is mostly composed of TOC-poor diamictons, indicating advanced coastal glacier margins and rapid iceberg discharge in proximal glaciomarine settings with limited productivity and meltwater supply. Fine-grained, TOC-rich sediments in the upper lithologic unit suggest more open water and warm conditions, leading to enhanced biological productivity due to increased nutrient-rich meltwater supply into the bay. The relationship between TOC and total sulfur (TS) indicates that the additional sulfur within the sediment has not originated from in situ pyrite formation under the reducing condition, but rather may be attributed to the detrital supply of sand-sized pyrite from the hydrothermal-origin, quartz-pyrite rocks widely distributed in King George Island. The evolution of bottom-water hydrography after deglaciation was recorded in the benthic foraminiferal stable-isotopic composition, corroborated by the TOC and lithologic changes. The 8110 values indicate that bottom-water in Maxwell Bay was probably mixed gradually with intruding (18)O-rich seawater from Bransfield Strait. In addition, the delta(13)C values reflect a spatial variability in the carbon isotope distribution in Maxwell Bay, depending on marine productivity as well as terrestrial carbon fluxes by meltwater discharge. The distinct lithologic transition, dated to approximately 8000 yr BP (uncorrected) and characterized by textural and geochemical contrasts, highlights the postglacial environmental change by a major coastal glacier retreat in Maxwell Bay.
ISSN
0800-0395
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/5600
DOI
10.1111/j.1751-8369.2003.tb00116.x
Bibliographic Citation
POLAR RESEARCH, v.22, no.2, pp.341 - 353, 2003
Publisher
CO-ACTION PUBLISHING
Subject
SOUTH-SHETLAND-ISLANDS; ROSS SEA; GLACIOMARINE SEDIMENTATION; CONTINENTAL-SHELF; PENINSULA; RADIOCARBON; RETREAT; OCEAN; COVE; DEPOSITION
Type
Article
Language
English
Document Type
Article
Publisher
CO-ACTION PUBLISHING
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