Rock Magnetic Data from West Antarctic Clasts

Federal Geographic Data Committee (FGDC) Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Reference_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Anne Grunow

Publication_Date: June 2004

Title: Rock Magnetic Data from West Antarctic Clasts

Edition:

Geospatial_Data_Presentation_Form: Excel spreadsheet or website by sample

Series_Information:

Series_Name:

Issue_Identification:

Publication_Information:

Publication_Place: Online WWW

Publisher:

Other_Citation_Details:

Online_Linkage: http://bprc.osu.edu/

Description:

Abstract:

The goal of this collaborative pilot project was to obtain the first petrological, geochemical, magnetic characterization of subglacial and basal sediments recovered from boreholes drilled to the base of the West Antarctic Ice Sheet (WAIS). Over the last two decades, samples of subglacial sediment (till) and basal debris were obtained from several locations across the WAIS (see map of locations, Vogel, 2004). Properties of the subglacial till layer were the specific target of hot water drilling at several Whillans, Kamb and Bindschadler Ice Stream (WIS, KIS and BIS) locations. At each site (UpB, newUpB, UpC, UpD, Siple Dome) piston cores up to 3 m long were recovered. Small amounts of subglacial till were recovered when drilling through Crary Ice Rise (CIR). Debris in basal ice (henceforth basal ice debris) was present in ice cores from Byrd Station, Unicorn, Siple Dome (H. Engelhardt and T. Gow personal communication) and the UpC Sticky Spot. The goal of the magnetics part of our pilot project was to provide rock magnetic data that could help identify the provenance of bedrock clasts found in the ice cores. Of particular interest was the identification of basaltic clasts that could be from the Cenozoic volcanoes beneath the WAIS. Grunow measured the intensity and susceptibility on more than 550 clasts found at the base of ice-cores in West Antarctica (see attached figure of magnetic data from granitic clasts). The work included rock density measurements necessary for volume correction of the magnetic data. Susceptiblity was measured on a KLY-3 kappabridge and intensity on a JR5A magnetometer for 550 clasts. Due to the irregular size of the pebbles,all of the data have been normalized to 1 cubic centimeter so that comparisons can be made with existing rock magnetic data found in the Antarctic Rock Magnetic Property database on the web.

Purpose:

Not Available

Supplemental_Information:

REFERENCE: S. W. Vogel, Tulaczyk, S., Grunow, "Provenance of West-Antarctic subglacial sediment" , bibl. SEAP workshop, Boulder, CO, (2003). Abstract Published Vogel, S and Grunow, A.M., "Magnetic properties of subglacial sediment from West-Antarctic Ice Streams" , bibl. West Antarctic Ice Sheet meeting, Algonkian Park, Sterling, New York, Sept 29-Oct 2, 2004, (2004). Abstract Submitted Vogel, S.W., "The basal regime of the West Antarctic Ice Sheet - interaction of subglacial geology with ice dynamics" , bibl. Ph.D thesis, Earth Science, University of California, Santa Cruz, (2004). Thesis Published Vogel, S. W., S. Tulaczyk, S. P. Carter, P. Renne and B. Turrin, "Geologic constraints on subglacial volcanism in West-Antarctica", Nature, vol. , (), p. . Submitted

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 19680101

Ending_Date: 20001231

Currentness_Reference:Unknown

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Description_of_Geographic_Extent:

Bounding_Coordinates:

West_Bounding_Coordinate: -170.0

East_Bounding_Coordinate: -110.0

North_Bounding_Coordinate: -79.0

South_Bounding_Coordinate: -84.0

Keywords:

Theme:

Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS

Theme_Keyword_Thesaurus: GCMD PLATFORM

Theme_Keyword_Thesaurus: GCMD INSTRUMENT

Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS

Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY

Theme_Keyword_Thesaurus: DATA SET LANGUAGE

Theme_Keyword: EARTH SCIENCE > PALEOCLIMATE > LAND RECORDS > GLACIATION

Theme_Keyword: EARTH SCIENCE > SOLID EARTH > GEOMAGNETISM > MAGNETIC FIELD > MAGNETIC INTENSITY

Theme_Keyword: EARTH SCIENCE > SOLID EARTH > GEOMAGNETISM

Theme_Keyword: EARTH SCIENCE > SOLID EARTH > ROCKS/MINERALS/CRYSTALS > BEDROCK LITHOLOGY

Theme_Keyword: EARTH SCIENCE > SOLID EARTH > ROCKS/MINERALS/CRYSTALS > SEDIMENTARY ROCKS

Theme_Keyword: EARTH SCIENCE > PALEOCLIMATE > LAND RECORDS > BOREHOLES

Theme_Keyword: FIELD INVESTIGATION

Theme_Keyword: MAGNETOMETERS

Theme_Keyword: Rock Magnetics

Theme_Keyword: West Anarctic

Theme_Keyword: Clasts

Theme_Keyword: Subglacial

Theme_Keyword: Till

Theme_Keyword: Magnetic Properties

Theme_Keyword: Wais

Theme_Keyword: West Antarctic Ice Sheet

Theme_Keyword: CLIMATOLOGY/METEOROLOGY/ATMOSPHERE

Theme_Keyword: GEOSCIENTIFIC INFORMATION

Theme_Keyword: ENGLISH

Place:

Place_Keyword_Thesaurus: GCMD

Place_Keyword: CONTINENT > ANTARCTICA

Place_Keyword: GEOGRAPHIC REGION > POLAR

Access_Constraints: No access constraints

Use_Constraints:

no constraints

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: STEFAN VOGEL

Contact_Position: TECHNICAL CONTACT

Contact_Address:

Address_Type: Mailing and Physical Address

Address: BPRC

Address: 108 Scott Hall

Address: 1090 Carmack Rd

City: C olumbus

State_or_Province: Ohio

Postal_Code: 43210

Country: USA

Contact_Voice_Telephone: 614-247-8082

Contact_Electronic_Mail_Address: vogel.118@osu.edu

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Each entry in the database for the West Antarctic subglacial clasts represents an individual measurement on an individual clast.

Logical_Consistency_Report:

Not Available

Completeness_Report:

Not Available

Lineage:

Process_Step:

Process_Description:

Not Available

Process_Date: Unknown

Spatial_Reference_Information:

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: OH-STATE/BPRC > Byrd Polar Research Center, The Ohio State University

Contact_Person: ANNE GRUNOW

Contact_Position: DATA CENTER CONTACT

Contact_Address:

Address_Type: Mailing and Physical Address

Address: United States Polar Rock Repository

Address: Byrd Polar Research Center

Address: Ohio State University

Address: 108 Scott Hall

Address: 1090 Carmack Road

City: Columbus

State_or_Province: Ohio

Postal_Code: 43210

Country: USA

Contact_Voice_Telephone: 614-292-5348

Contact_Electronic_Mail_Address: curator@bprc.mps.ohio-state.edu, grunow.1@osu.edu

Resource_Description: Antarctic Rock Magnetic Database

Distribution_Liability:

Not Available

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: Excel spreadsheet

Transfer_Size: 500kb

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

http://bprc.osu.edu/

Access_Instructions:

DATA CENTER URL

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

http://bprc.osu.edu/

Access_Instructions:

Rock Magnetic Clast data are at this website

Fees: 0

Metadata_Reference_Information:

Metadata_Date: 20040823

Metadata_Review_Date: 20100707

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: GCMD User Support Office

Contact_Organization: NASA Global Change Master Directory

Contact_Address:

Address_Type: Mailing and Physical Address

Address: Not Available

City: Lanham

State_or_Province: MD

Postal_Code: 20706

Country: USA

Contact_Voice_Telephone: Not Available

Contact_Electronic_Mail_Address: gcmduso@gcmd.gsfc.nasa.gov

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time