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Global Change Master Directory (GCMD)
Glacial geology of Northern and Central Victoria Land and Marie Byrd Land
Entry ID: NL_ANTARCTIC_GLACIAL_GEOLOGY


Summary
Abstract: Separate regions within the Transantarctic Mountains, the uplifted flank of the
West Antarctic rift system, appear to have distinct Neogene histories of
glaciation and valley downcutting. Incision of deep glacial outlet valleys
occurred at different times throughout central and northern Victoria Land. This
is corroborated by measurements of cosmogenic nuclides 21Ne, 10Be and 26Al of
glacial erosion surfaces and high-elevated moraines. 21Ne ages of two summit
plateaus, at elevations of 1650 m in central Victoria Land and ~2800 m in
northern Victoria Land, range from 3.84 to 11.2 Ma, respectively. The latter
date indicates that these glacial erosion surfaces are the oldest known
exposure dated surfaces on Earth. Glacial erosion terraces, remnants of early
phases of valley downcutting, have 21Ne ages of 1.27 and 6.45 Ma for central
Victoria Land and northern Victoria Land, respectively. Therefore, deglaciation
of summit plateaus, valley downcutting and topographic uplift occurred during
the mid Miocene in northern Victoria Land and not earlier than the mid Pliocene
in central Victoria Land. In northern Victoria Land ice flow directions changed
markedly from the time a regional ice sheet occupied the level of the highest
summits to the present condition with summits rising up to 800 above the valley
glaciers. In central Victoria Land the oldest documented ice flow direction
occupying the summit erosion surface prior to incision was SW-NE, draining the
East Antarctic Ice Sheet along an outlet glacier at least ten times as wide as
the present E-W flowing David Glacier. This great variation in denudation
histories probably results from differential tectonic uplift of various regions
within the presently active rift flank. Three tectonic processes contribute to
late Neogene uplift, (1) ongoing extension in adjacent Ross Sea rift basins,
(2) regional dextral transtension following SE trending Precambrian and
Palaeozoic structural trends which offsets the ~N-S trending grain of the rift
and reactivates earlier faults, and (3) isostatic response to valley
downcutting and related denudation.

INVESTIGATORS
Dr F.M. Van der Wateren
A.L.L.M. Verbers (M. Sc)
Dr T.J. Dunai
Dr. S. Passchier

Related URL
Link: View Related Information
Description: The above URL is the location of Frederick (Dick) van der
Wateren's homepage. Descriptions of the above and other research
projects are available at this related URL.

Geographic Coverage
 N: -68.0 S: -76.0  E: 172.0  W: 150.0
 N: -76.0 S: -78.0  E: -140.0  W: -160.0

 Min Altitude: 844 M  Max Altitude: 2850 M

 Min Altitude: 844 M  Max Altitude: 2850 M

Data Set Citation
Dataset Creator: Dr. F.M. Van der Wateren, A.L.L.M. Verbers, Dr. T.J. Dunai, Dr. S. Passchier
Dataset Title: Glacial geology of Northern and Central Victoria Land and Marie Byrd Land
Dataset Release Place: Amsterdam
Dataset Publisher: Vrije Universiteit
Version: Not provided


Temporal Coverage
Start Date: 1988-01-01
Stop Date: 1999-12-31


Paleo_Temporal_Coverage
Paleo Start Date: 11 Ma
Paleo Stop Date: 29 Ka
Chrono Unit:
Chrono Unit:
Chrono Unit:
Chrono Unit:


Location Keywords
CONTINENT > ANTARCTICA > CENTRAL VICTORIA LAND
CONTINENT > ANTARCTICA > MARIE BYRD LAND
CONTINENT > ANTARCTICA > NORTHERN VICTORIA LAND
GEOGRAPHIC REGION > POLAR


Science Keywords
LAND SURFACE >EROSION/SEDIMENTATION >EROSION >GLACIAL EROSION    [Definition]
LAND SURFACE >GEOMORPHIC LANDFORMS/PROCESSES >GLACIAL PROCESSES    [Definition]
PALEOCLIMATE >LAND RECORDS >GLACIATION >MORAINES    [Definition]
SOLID EARTH >GEOCHEMISTRY >GEOCHEMICAL PROPERTIES >ISOTOPES >COSMOGENIC ISOTOPES    [Definition]
SOLID EARTH >GEOMORPHIC LANDFORMS/PROCESSES >GLACIAL LANDFORMS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >AGE DETERMINATIONS >SURFACE EXPOSURE DATES    [Definition]
SOLID EARTH >TECTONICS >NEOTECTONICS >RIFT FLANK    [Definition]


Platform
FIELD SURVEYS    [Information]


Instrument
MASS SPECTROMETERS    [Information]


Quality
For surface exposure dating quartz samples have been collected from
glacial striated erosion surfaces for which we assumed zero erosion
following first exposure.

Samples were routinely processed for 10Be and 26Al tandem accelerator
mass spectrometry (ETH Z|rich) and 21Ne noble gas mass spectrometry
(VU Amsterdam).

Altitudes were measured above sea level.


Access Constraints
Available for scientific research, contact A. Lankreijer.


Use Constraints
Available for scientific research, contact A. Lankreijer.


Keywords
COSMOGENIC ISOTOPES
DENUDATION
EROSION
GEOMORPHOLOGY
GLACIAL GEOLOGY
MORAINES
NEOTECTONICS
RIFT SHOULDER
SURFACE EXPOSURE DATING
SURFACE UPLIFT


Data Set Progress
COMPLETE


Data Center
Faculty of Earth Science, Vrije Universiteit, Amsterdam    [Information]
Data Center URL: http://www.geo.vu.nl/

Data Center Personnel
Name: ANCO LANKREIJER
Phone: +31 (0)20 44 47264
Email: lana at geo.vu.nl
Contact Address:
Vrije Universiteit
Faculteit der Aardwetenschappen
De Boelelaan 1085
City: Amsterdam
Postal Code: 1081 HV
Country: THE NETHERLANDS



Distribution
Distribution_Media: CD-ROM


Personnel
ANCO LANKREIJER
Role: TECHNICAL CONTACT
Phone: +31 (0)20 44 47264
Email: lana at geo.vu.nl
Contact Address:
Vrije Universiteit
Faculteit der Aardwetenschappen
De Boelelaan 1085
City: Amsterdam
Postal Code: 1081 HV
Country: THE NETHERLANDS


FREDERIK M. VAN DER WATEREN
Role: INVESTIGATOR
Role: METADATA AUTHOR
Phone: +31 204447304
Email: watd at geo.vu.nl
Contact Address:
Vrije Universiteit
Faculteit der Aardwetenschappen
De Boelelaan 1085
City: Amsterdam
Postal Code: 1081 HV
Country: NETHERLANDS


Extended Metadata Properties
(Click to view more)

Creation and Review Dates
DIF Creation Date: 2001-06-08
Last DIF Revision Date: 2018-11-08



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