Magnetic Data from Subglacial Clasts, West Antarctic Ice Sheet
Entry ID: NSF0087390

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Summary
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.

Related URL
Link: GET DATA
Description: Rock Magnetic Clast data are at this website


Geographic Coverage
 N: -79.0 S: -84.0  E: -110.0  W: -170.0

Data Set Citation
Dataset Originator/Creator: Anne Grunow
Dataset Title: Rock Magnetic Data from West Antarctic Clasts
Dataset Release Date: June 2004
Dataset Release Place: Online WWW
Data Presentation Form: Excel spreadsheet or website by sample
Online Resource: http://bprc.osu.edu/


Temporal Coverage
Start Date: 1968-01-01
Stop Date: 2000-12-31


Paleo_Temporal_Coverage
Chrono Unit:


Location Keywords
CONTINENT > ANTARCTICA
GEOGRAPHIC REGION > POLAR


Science Keywords
PALEOCLIMATE >LAND RECORDS >GLACIATION    [Definition]
SOLID EARTH >GEOMAGNETISM >MAGNETIC FIELD >MAGNETIC INTENSITY    [Definition]
SOLID EARTH >GEOMAGNETISM    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >BEDROCK LITHOLOGY    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >SEDIMENTARY ROCKS    [Definition]
PALEOCLIMATE >LAND RECORDS >BOREHOLES    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
GEOSCIENTIFIC INFORMATION


Platform
FIELD INVESTIGATION    [Information]


Instrument
MAGNETOMETERS    [Information]


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


Access Constraints
No access constraints


Use Constraints
no constraints


Keywords
rock magnetics
West Anarctic
Clasts
Subglacial
till
magnetic properties
WAIS
West Antarctic Ice Sheet


Data Set Progress
COMPLETE


Originating Center
OH-STATE/BPRC


Data Center
Byrd Polar Research Center, The Ohio State University    [Information]
Data Center URL: http://bprc.osu.edu/
Dataset ID: Antarctic Rock Magnetic Database

Data Center Personnel
Name: ANNE GRUNOW
Phone: 614-292-5348
Email: curator at bprc.mps.ohio-state.edu, grunow.1 at osu.edu
Contact Address:
United States Polar Rock Repository
Byrd Polar Research Center
Ohio State University
108 Scott Hall
1090 Carmack Road
City: Columbus
Province or State: Ohio
Postal Code: 43210
Country: USA



Distribution
Distribution_Media: email or website
Distribution_Size: 500kb
Distribution_Format: Excel spreadsheet
Fees: 0


Personnel
ANNE GRUNOW
Role: INVESTIGATOR
Phone: 614-292-5348
Email: curator at bprc.mps.ohio-state.edu, grunow.1 at osu.edu
Contact Address:
United States Polar Rock Repository
Byrd Polar Research Center
Ohio State University
108 Scott Hall
1090 Carmack Road
City: Columbus
Province or State: Ohio
Postal Code: 43210
Country: USA


STEFAN VOGEL
Role: TECHNICAL CONTACT
Phone: 614-247-8082
Email: vogel.118 at osu.edu
Contact Address:
BPRC
108 Scott Hall
1090 Carmack Rd
City: C olumbus
Province or State: Ohio
Postal Code: 43210
Country: USA


Publications/References
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

Creation and Review Dates
DIF Creation Date: 2004-08-23
Last DIF Revision Date: 2010-07-07

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