Establishing the pattern of Holocene-LGM changes in sediment contributions from Antarctica to the Southern Ocean

Federal Geographic Data Committee (FGDC) Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Unknown
Publication_Date: Unknown
Title: Establishing the pattern of Holocene-LGM changes in sediment contributions from Antarctica to the Southern Ocean
Description:
Abstract:
Terrigenous clastic sediments are brought to the ocean from continental sources via rivers, ice and wind, and distributed within the ocean by surface and deep currents. By investigating long-lived radioactive decay systems, the sediment sources can be traced and the geological history of those sources can be delineated. The sediments deposited along the Antarctic coast represent a mixture of different lithologies that were incorporated progressively during glacial transport, and their composition reflects the variety of bedrock lithologies underlying different sectors of the ice sheet. The different basement provinces yield distinctive isotopic signatures, and the sediments deposited in proximal regions of the Antarctic continent contain information about Antarctic basement ages and its geological evolution. This project represents a first attempt to document regionally integrated provenance signals and individual mineral ages of Antarctic sources to the Southern Ocean. We analyzed (1) Nd, Hf, and Sr isotope ratios and Sm/Nd ratios of terrigenous sediment from ~40 cores taken near the perimeter of the Antarctic continent, south of the Antarctic Divergence, and northward into the Antarctic Circumpolar Current; (2) K-Ar ages of >500 individual detrital hornblende crystals from a subset of the core samples; and (3) Hf isotope ratios of Circum-Antarctic Fe-Mn crusts that were previously analyzed for Pb and Nd isotope ratios (Abouchami and Goldstein, GCA, 1995 and Albarede, Goldstein Dautel, GCA 1997). The purposes of the terrigenous sediment and Fe-Mn analyses were (1) to gain a basic understanding of the "crustal residence ages" of the source terrains, that is, the average amount of time the material has been part of the continental crust, (2) track their dispersal into the Antarctic Circumpolar Current based on analyses of samples from south and north of the Antarctic Divergence during the Holocene and Last Glacial Maximum (LGM), (3) to investigate the potential contributions of Antarctic sources to the dissolved Nd and Hf load in the Circum-Antarctic. The hornblende K-Ar ages were measured in order to (4) generate a thermal history of the sediment sources to compare with the bulk sediment crustal residence ages. Thus, the project has aspects that address the geological evolution of Antarctica as well as global climate change.
Purpose:
Not Available
Supplemental_Information:
Not Available
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: -180.0
East_Bounding_Coordinate: 180.0
North_Bounding_Coordinate: -39.57
South_Bounding_Coordinate: -73.54
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY
Theme_Keyword_Thesaurus: DATA SET LANGUAGE
Theme_Keyword: EARTH SCIENCE > OCEANS > MARINE SEDIMENTS > HYDROGENOUS SEDIMENTS
Theme_Keyword: EARTH SCIENCE > OCEANS > MARINE SEDIMENTS > SEDIMENT COMPOSITION
Theme_Keyword: EARTH SCIENCE > OCEANS > MARINE SEDIMENTS > SEDIMENT TRANSPORT
Theme_Keyword: EARTH SCIENCE > OCEANS > MARINE SEDIMENTS > TERRIGENOUS SEDIMENTS
Theme_Keyword: EARTH SCIENCE > OCEANS > MARINE SEDIMENTS
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > RADIONUCLIDES
Theme_Keyword: EARTH SCIENCE > OCEANS > SEA ICE > ICEBERGS
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > GEOCHEMISTRY > GEOCHEMICAL PROPERTIES > ISOTOPES
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > ROCKS/MINERALS/CRYSTALS > ELEMENTS > TRACE ELEMENTS
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > GEOCHEMISTRY
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > ROCKS/MINERALS/CRYSTALS > AGE DETERMINATIONS
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > ROCKS/MINERALS/CRYSTALS > MINERALS
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > ROCKS/MINERALS/CRYSTALS > SEDIMENTS
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > ROCKS/MINERALS/CRYSTALS
Theme_Keyword: EARTH SCIENCE > OCEANS > MARINE SEDIMENTS > SEDIMENT CHEMISTRY
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > GEOCHEMISTRY > MARINE GEOCHEMICAL PROCESSES
Theme_Keyword: EARTH SCIENCE > OCEANS > MARINE VOLCANISM
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > ICEBERGS
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > TECTONICS > PLATE TECTONICS
Theme_Keyword: EARTH SCIENCE > PALEOCLIMATE > PALEOCLIMATE RECONSTRUCTIONS > ATMOSPHERIC CIRCULATION RECONSTRUCTION
Theme_Keyword: CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
Theme_Keyword: GEOSCIENTIFIC INFORMATION
Theme_Keyword: INLAND WATERS
Theme_Keyword: OCEANS
Theme_Keyword: ENGLISH
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: OCEAN > SOUTHERN OCEAN
Place_Keyword: CONTINENT > ANTARCTICA
Place_Keyword: GEOGRAPHIC REGION > POLAR
Access_Constraints: Not Available
Use_Constraints:
Not Available
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: STEVEN L GOLDSTEIN
Contact_Person_Primary:
Contact_Person: SIDNEY R HEMMING
Contact_Person_Primary:
Contact_Person: MARTIN ROY
Contact_Person_Primary:
Contact_Person: TINA VAN DE FLIERDT
Contact_Position: INVESTIGATOR
Contact_Position: DIF AUTHOR
Contact_Position: INVESTIGATOR
Contact_Position: INVESTIGATOR
Contact_Position: INVESTIGATOR
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Lamont-Doherty Earth Observatory
Address: 61 Rt. 9W
City: Palisades
State_or_Province: NY
Postal_Code: 10964
Country: USA
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Lamont-Doherty Earth Observatory
Address: 61 Rt. 9W
City: Palisades
State_or_Province: NY
Postal_Code: 10964
Country: USA
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Lamont-Doherty Earth Observatory
Address: 61 Rt. 9W
City: Palisades
State_or_Province: NY
Postal_Code: 10964
Country: USA
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Lamont-Doherty Earth Observatory
Address: 61 Rt. 9W
City: Palisades
State_or_Province: NY
Postal_Code: 10964
Country: USA
Contact_Voice_Telephone: 845-365-8787
Contact_Voice_Telephone: 845-365-8417
Contact_Voice_Telephone: 845-365-8603
Contact_Voice_Telephone: 845-365-8606
Contact_Facsimile_Telephone: 845-365-8155
Contact_Facsimile_Telephone: 845-365-8155
Contact_Facsimile_Telephone: 845-365-8155
Contact_Facsimile_Telephone: 845-365-8155
Contact_Electronic_Mail_Address: steveg@ldeo.columbia.edu
Contact_Electronic_Mail_Address: sidney@ldeo.columbia.edu
Contact_Electronic_Mail_Address: mroy@ldeo.columbia.edu
Contact_Electronic_Mail_Address: tina@ldeo.columbia.edu
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Not Available
Logical_Consistency_Report:
Not Available
Completeness_Report:
Not Available
Lineage:
Process_Step:
Process_Description:
Not Available
Process_Date: Unknown
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Spatial_Reference_Information:
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: COLUMBIA/LDEO > Lamont-Doherty Earth Observatory, Columbia University
Contact_Person: STEVEN SIDNEY L R GOLDSTEIN HEMMING
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Lamont-Doherty Earth Observatory
Address: 61 Rt. 9W
City: Palisades
State_or_Province: NY
Postal_Code: 10964
Country: USA
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Lamont-Doherty Earth Observatory
Address: 61 Rt. 9W
City: Palisades
State_or_Province: NY
Postal_Code: 10964
Country: USA
Contact_Voice_Telephone: 845-365-8787
Contact_Voice_Telephone: 845-365-8417
Contact_Facsimile_Telephone: 845-365-8155
Contact_Facsimile_Telephone: 845-365-8155
Contact_Electronic_Mail_Address: steveg@ldeo.columbia.edu
Contact_Electronic_Mail_Address: sidney@ldeo.columbia.edu
Resource_Description: Antarctic sediment isotope data
Distribution_Liability:
Not Available
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Not Available
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://www.ldeo.columbia.edu/
Access_Instructions:
DATA CENTER URL
Digital_Transfer_Option:
Fees: Not Available
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Metadata_Reference_Information:
Metadata_Date: 20050426
Metadata_Review_Date: 20051221
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: STEVEN L GOLDSTEIN
Contact_Position: INVESTIGATOR
Contact_Position: DIF AUTHOR
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Lamont-Doherty Earth Observatory
Address: 61 Rt. 9W
City: Palisades
State_or_Province: NY
Postal_Code: 10964
Country: USA
Contact_Voice_Telephone: 845-365-8787
Contact_Facsimile_Telephone: 845-365-8155
Contact_Electronic_Mail_Address: steveg@ldeo.columbia.edu
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
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