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Determination of the origin of marine diatoms in the Sirius Group glacial deposits from Table Mountain and Mt Feather and the conditions for authigenic chabazite formation in these rocks
Entry ID: K045_1994_1995_NZ_2


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Summary
Abstract: The age of the Sirius Group glacial deposits in the Transantarctic Mountains are a topic of debate. There are two conflicting models which try to explain the origin of diatoms found in tillite beds in the glacial deposits. One is that the diatoms were from the Antarctic interior and were subsequently eroded and deposited in the tillite. The second model is that the three million year old diatoms were blown by wind into the tillite and incorporated by periglacial processes. This study aimed to distinguish between these two models. The distribution of Sirius Group tillite deposits on Table Mountain, Mount Feather and Mt Crean were mapped with a staff and abney level. The Sirius deposit was then sampled at various depth intervals using a hand operated percussion tool. Fifteen samples were taken in the top section and seven in the bottom section at Table Mountain. The in situ fabric (the orientation and size distribution of the pebbles) was measured to find the mean flow direction of the glacier which deposited the moraine. At Mt Feather, >50 samples from three sites of the Sirius deposits were sampled. At both sites, neighbouring snow samples were collected, melted, filtered and the residue collected to check for currently existing diatoms. In an extension of this study, analysis of the samples revealed authigenic chabazite within Table Mountain samples but not those from Mount Feather. Investigations were undertaken to assess the formation of chabazite under the conditions found at Table Mountain.

Related URL
Link: GET DATA
Description: The PETLAB database catalogue.


Geographic Coverage
 N: -77.9667 S: -77.9667  E: 160.0  W: 160.0
 N: -77.933334 S: -77.933334  E: 160.46666  W: 160.46666
 N: -77.8833 S: -77.8833  E: 159.5  W: 159.5

Temporal Coverage
Start Date: 1994-11-18
Stop Date: 1994-11-30


Location Keywords
CONTINENT > ANTARCTICA
CONTINENT > ANTARCTICA > TABLE MOUNTAIN
CONTINENT > ANTARCTICA > MT CREAN
CONTINENT > ANTARCTICA > MT FEATHER
GEOGRAPHIC REGION > POLAR


Science Keywords
LAND SURFACE >GEOMORPHOLOGY >TECTONIC LANDFORMS/PROCESSES    [Definition]
PALEOCLIMATE >LAND RECORDS >MICROFOSSILS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >AGE DETERMINATIONS    [Definition]


ISO Topic Category
GEOSCIENTIFIC INFORMATION


Platform
FIELD SURVEYS    [Information]
LABORATORY    [Information]
FIELD INVESTIGATION    [Information]


Instrument
VISUAL OBSERVATIONS    [Information]


Quality
Any remaining samples are stored in the Victoria University of Wellington rock collection, online on the PETLAB database.
For more information, please contact:

Stephen Eager
Collections Technician
School of Geography, Environment and Earth Science
Victoria University of Wellington
Phone: +64 4 463 6192
Email: stephen.eager@vuw.ac.nz


Data Set Progress
COMPLETE


Data Center
Antarctica New Zealand, New Zealand Antarctic Institute, New Zealand    [Information]
Data Center URL: http://www.antarcticanz.govt.nz/

Data Center Personnel
Name: SHULAMIT GORDON
Phone: +64 3 358 0200
Fax: +64 3 358 0211
Email: s.gordon at antarcticanz.govt.nz
Contact Address:
Antarctica New Zealand
Private Bag 4745
City: Christchurch
Country: New Zealand


Personnel
NERIDA BLEAKLEY
Role: INVESTIGATOR
Phone: +61 03 6233 3645
Email: Nerida.Bleakley at dpiw.tas.gov.au
Contact Address:
Water Management Planning, Water Resource Division
Department of Primary Industries and Water
PO BOX 44
City: Hobart
Province or State: Tasmania
Postal Code: 7001
Country: Australia


CEISHA POIROT
Role: DIF AUTHOR
Phone: +64 3 358 0200
Fax: +64 3 358 0211
Email: c.poirot at antarcticanz.govt.nz
Contact Address:
Antarctica New Zealand
Private Bag 4745
City: Christchurch
Country: New Zealand


SHULAMIT GORDON
Role: DIF AUTHOR
Phone: +64 3 358 0200
Fax: +64 3 358 0211
Email: s.gordon at antarcticanz.govt.nz
Contact Address:
Antarctica New Zealand
Private Bag 4745
City: Christchurch
Country: New Zealand


Publications/References
Dickinson, W.W. Grapes, R.H. 1997 Authigenic chabazite and implications for weathering in Sirius Group diamictite, Table Mountain, Dry Valleys, Antarctica. Journal of sedimentary research A 67(5): 815-820

Barrett, P.J. Bleakley, N.L. Dickinson, W.W. Hannah, M.J. Harper, M.A. 1997 Distribution of siliceous microfossils on Mount Feather, Antarctica, and the age of the Sirius Group. Antarctic region: geological evolution and processes; proceedings of the 7th Symposium on Antarctic Geological Sciences, Sienna, Sept 10-15, 1995. Ricci, C.A. (ed), Sienna Terra Antartica Publications 8890022108

Bleakley, N.L. 1996. Siliceous microfossiils on Mount Feather and Table Mountain, Antarctica and their origin. MSc thesis, Victoria University of Wellington, New Zealand.

Dickinson, W. Bleakley, N. Facies control on diagenesis in frozen sediments: The Sirius Group, Table Mountain and Mount Feather, Dry Valleys, Antarctica. Terra Antartica 12(1): 25-34, 2005.

Creation and Review Dates
DIF Creation Date: 2009-05-21
Last DIF Revision Date: 2009-06-06


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