Data

Coring Analyses of Cores from Near Shore Sites in the Vestfold Hills

Australian Antarctic Division
Burton, H. ; BURTON, HARRY
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=info:doi10.4225/15/57E373C58D19E&rft.title=Coring Analyses of Cores from Near Shore Sites in the Vestfold Hills&rft.identifier=10.4225/15/57E373C58D19E&rft.publisher=Australian Antarctic Data Centre&rft.description=The sedimentological, chemical and isotopic characteristics of sediment cores from three slightly saline to hypersaline lakes (Highway, Ace and Organic Lakes) and two marine inlets (Ellis Fjord and Taynaya Bay) in the Vestfold Hills, Antarctica have been examined.Sections of the cores deposited in marine environments are characterised by uniform, regularly laminated, fine grained, organic-rich sediments, with uniform organic delta 13C values (-18.0 to 19.4 ppt vs. PDB) and sulfur contents. In contrast, sediments deposited in lacustrine environments are extremely heterogeneous, varying from finely laminated mat-like sequences to poorly sorted clastic-rich sediments. Authigenic monohydrocalcite and aragonite occur in some lake sediments. The delta 13C values of organic matter in the lacustrine sediments exhibit an extremely wide range (-10.5 to -25.3 ppt) that can be related to variations in physico-chemical conditions in the lake waters. Strongly negative organic-delta 13C values coupledwith high sulfur contents are indicative of an anoxic zone in the overlying lake waters, whereas less negative organic-delta 13C values coupled with low sulfur contents are indicative of well-mixed oxic conditions. Particularly high organic-delta 13C values result during high levels of microbial activity in the lakes, due to high rates of photosynthetic CO2 fixation. The large shifts in organic-delta 13C are not necessarily accompanied by any change in macroscopic sedimentological characteristics, illustrating the utility if isotopic investigations in these environments. The delta 13C composition of authigenic carbonate in hypersaline Organic Lake sediments provides a record of changes in palaeoproductivity, while the delta 18O of the carbonate provides information on rates of meltwater input and evaporation in the lake. 14C-dating suggests that Highway Lake was isolated from the sea by isostatic uplift at least 4600 years before present (BP) whereas Organic Lake was isolated at approximately 2700 years BP. Apparent emergence rates calculated from the 14C ages range from 1.0 to 2.1 mm per year.The 'reservoir effect' in the lacustrine and marine environments is variable, but probably does not exceed ~ 1000 years in any of the lakes examined.Progress Code: completed&rft.creator=Burton, H. &rft.creator=BURTON, HARRY &rft.date=2000&rft.coverage=westlimit=78.1878; southlimit=-68.603; eastlimit=78.2923; northlimit=-68.4718&rft.coverage=westlimit=78.1878; southlimit=-68.603; eastlimit=78.2923; northlimit=-68.4718&rft.coverage=uplimit=117; downlimit=7.5&rft.coverage=uplimit=117; downlimit=7.5&rft_rights=These data are publicly available for download from the provided URL. Files are stored as excel spreadsheets.&rft_rights=Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/legalcode&rft_rights=This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_310 when using these data.&rft_rights=This metadata record is publicly available.&rft_subject=climatologyMeteorologyAtmosphere&rft_subject=environment&rft_subject=geoscientificInformation&rft_subject=inlandWaters&rft_subject=oceans&rft_subject=EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > SURFACE WATER > SURFACE WATER FEATURES > LAKES/RESERVOIRS&rft_subject=EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > ISOTOPES > STABLE ISOTOPES&rft_subject=EARTH SCIENCE > PALEOCLIMATE > OCEAN/LAKE RECORDS > ISOTOPES&rft_subject=EARTH SCIENCE > PALEOCLIMATE > OCEAN/LAKE RECORDS > SEDIMENTS&rft_subject=ANTARCTICA&rft_subject=CORES&rft_subject=FJORD&rft_subject=HYPERSALINE&rft_subject=ISOTOPE&rft_subject=LAKES&rft_subject=SALINE&rft_subject=SEDIMENT&rft_subject=VESTFOLD HILLS&rft_subject=FIELD SURVEYS&rft_subject=Palaeo Start Date 4600 YBP&rft_subject=Palaeo Stop Date&rft_subject=PHANEROZOIC > CENOZOIC > QUATERNARY > HOLOCENE&rft_subject=AMD/AU&rft_subject=CEOS&rft_subject=AMD&rft_subject=CONTINENT > ANTARCTICA > Vestfold Hills&rft_subject=GEOGRAPHIC REGION > POLAR&rft.type=dataset&rft.language=English Access the data
Cite Saved to MyRDA Save to MyRDA

Licence & Rights:

Open Licence view details
CC-BY

Attribution 4.0 International (CC BY 4.0)
https://creativecommons.org/licenses/by/4.0/legalcode

These data are publicly available for download from the provided URL. Files are stored as excel spreadsheets.

This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_310 when using these data.

This metadata record is publicly available.

Access:

Other

Full description

The sedimentological, chemical and isotopic characteristics of sediment cores from three slightly saline to hypersaline lakes (Highway, Ace and Organic Lakes) and two marine inlets (Ellis Fjord and Taynaya Bay) in the Vestfold Hills, Antarctica have been examined.
Sections of the cores deposited in marine environments are characterised by uniform, regularly laminated, fine grained, organic-rich sediments, with uniform organic delta 13C values (-18.0 to 19.4 ppt vs. PDB) and sulfur contents. In contrast, sediments deposited in lacustrine environments are extremely heterogeneous, varying from finely laminated mat-like sequences to poorly sorted clastic-rich sediments. Authigenic monohydrocalcite and aragonite occur in some lake sediments.
The delta 13C values of organic matter in the lacustrine sediments exhibit an extremely wide range (-10.5 to -25.3 ppt) that can be related to variations in physico-chemical conditions in the lake waters. Strongly negative organic-delta 13C values coupledwith high sulfur contents are indicative of an anoxic zone in the overlying lake waters, whereas less negative organic-delta 13C values coupled with low sulfur contents are indicative of well-mixed oxic conditions. Particularly high organic-delta 13C values result during high levels of microbial activity in the lakes, due to high rates of photosynthetic CO2 fixation. The large shifts in organic-delta 13C are not necessarily accompanied by any change in macroscopic sedimentological characteristics, illustrating the utility if isotopic investigations in these environments. The delta 13C composition of authigenic carbonate in hypersaline Organic Lake sediments provides a record of changes in palaeoproductivity, while the delta 18O of the carbonate provides information on rates of meltwater input and evaporation in the lake. 14C-dating suggests that Highway Lake was isolated from the sea by isostatic uplift at least 4600 years before present (BP) whereas Organic Lake was isolated at approximately 2700 years BP. Apparent emergence rates calculated from the 14C ages range from 1.0 to 2.1 mm per year.

The 'reservoir effect' in the lacustrine and marine environments is variable, but probably does not exceed ~ 1000 years in any of the lakes examined.

Lineage

Progress Code: completed

Data time period: 1978-09-01 to 1987-12-31

This dataset is part of a larger collection

Click to explore relationships graph
Help

Related People

78.2923,-68.4718 78.2923,-68.603 78.1878,-68.603 78.1878,-68.4718 78.2923,-68.4718

78.24005,-68.5374

text: westlimit=78.1878; southlimit=-68.603; eastlimit=78.2923; northlimit=-68.4718

text: uplimit=117; downlimit=7.5

Subjects
AMD | AMD/AU | ANTARCTICA | CEOS | CONTINENT > ANTARCTICA > Vestfold Hills | CORES | EARTH SCIENCE > PALEOCLIMATE > OCEAN/LAKE RECORDS > ISOTOPES | EARTH SCIENCE > PALEOCLIMATE > OCEAN/LAKE RECORDS > SEDIMENTS | EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > SURFACE WATER > SURFACE WATER FEATURES > LAKES/RESERVOIRS | EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > ISOTOPES > STABLE ISOTOPES | FIELD SURVEYS | FJORD | GEOGRAPHIC REGION > POLAR | HYPERSALINE | ISOTOPE | LAKES | PHANEROZOIC > CENOZOIC > QUATERNARY > HOLOCENE | Palaeo Start Date 4600 YBP | Palaeo Stop Date | SALINE | SEDIMENT | VESTFOLD HILLS | climatologyMeteorologyAtmosphere | environment | geoscientificInformation | inlandWaters | oceans |

User Contributed Tags    

Login to tag this record with meaningful keywords to make it easier to discover

Other Information
Download Page for the Australian Antarctic Data Centre (GET DATA)

url : http://data.aad.gov.au/aadc/portal/download_file.cfm?file_id=1306

Public information for ASAC project 310 (PROJECT HOME PAGE)

url : https://projects.aad.gov.au/search_projects_results.cfm?project_no=310

Citation reference for this metadata record and dataset (VIEW RELATED INFORMATION)

url : http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_310

Identifiers
ACN 633 798 857