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Proterozoic and Palaeozoic evolution of the Rauer Group

Entry ID: ASAC_1129

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Summary

Abstract: ---- Public Summary from Project ----
The Gondwana continent existed in the Proterozoic, that is some 500 million years ago, in which Antarctica - Australia - India were once joined as a large landmass. Today the continents of the Southern Hemisphere are widely separated. This project is to investigate the processes related to the formation and dismemberment of the Gondwana landmass.

From the ... abstracts of some of the referenced papers:

Granulite facies metapelites of the Mather and Filla Paragneisses within the Rauer Group, east Antarctica, possess markedly different compositions. The metamorphic evolution of the two metapelite types has been interpreted as temporally distinct, with the Rauer Group preserving at least two distinct granulite facies tectonothermal episodes. Calculated P-T pseudosections and orthopyroxene Al content indicate the revised maximum-preserved P-T conditions within the Mather Paragneiss to lie in the vicinity of 950-975 degrees C and 10-10.6kbar, less extreme than previous estimates. The range of possible P-T paths for the Mather Paragneiss consistent with mineral textural relationships and pseudosections contoured for mineral proportion are significantly shallower (dP/dT) than previous estimates. A near-isothermal decompression P-T path, and extreme peak metamorphic conditions, are not necessary to explain the development of preserved mineral reaction textures. The Filla Paragneiss contains peltic assemblages less amenable to rigorous quantitative analysis. Nevertheless, possibilities for the shared or otherwise metamorphic evolution of the Mather and Filla Paragneisses may be postulated on the basis of calculated pseudosections in the context of existing geochronology for the Rauer Group and preserved microstructures. A shared evolution, most likely during Pan-African granulite facies metamorphism, is plausible and consistent with mineral assemblage development, geochronology and microstructures. A revised interpretation of the Rauer Group's preserved metamorphic evolution may warrant the revision of existing tectonic models, applicable also to the reminder of Prydz Bay. More generally, the employed approach may incite a revision of peak P-T and P-T paths in other granulite facies terranes.

Descriptions of the data files are as follows:

for Ar data, these are Ar isotopes (36Ar, 37Ar and 39Ar etc) used for Ar age calculation, as it represents important time of cooling and exhumation of the study region. Ca/K ratio is used for excess.

For the mineral composition data, each column is weight percent content of main oxides (SiO2, MgO, FeO ..... ZnO) of each mineral, as they are used for metamorphic condition estimates.

RauerProbe2.xls: chemical composition of silicate minerals in granulite-facies rocks from the Rauer Group, Prydz Bay, east Antarctica. Compositions determined by electron microprobe and presented as weight% oxide and element cations.

CMPTab1.xls: Uranium, thorium and lead chemical composition (parts per million and/or weight %) of monazite from granulite-facies rocks in the Rauer Group, east Antarctica. The Th-U-Pb chemical age corresponding to the chemical compositions is also presented.

JMGTable3.xls: chemical composition of silicate minerals in granulite-facies rocks from the Rauer Group, Prydz Bay, east Antarctica. Compositions determined by electron microprobe and presented as weight% oxide and element cations.

JMGTable4.xls: chemical composition of silicate minerals in granulite-facies rocks from the Rauer Group, Prydz Bay, east Antarctica. Compositions determined by electron microprobe and presented as weight% oxide and element cations.

JMGTable5.xls: chemical composition of silicate minerals in granulite-facies rocks from the Rauer Group, Prydz Bay, east Antarctica. Compositions determined by electron microprobe and presented as weight% oxide and element cations.

RauerProbe1.xls: chemical composition of silicate minerals in granulite-facies rocks from the Rauer Group, Prydz Bay, east Antarctica. Compositions determined by electron microprobe and presented as weight% oxide and element cations.

Related URL

Link: GET DATA

Description: Download point for the data

Geographic Coverage

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Spatial coordinates

N: -68.0

S: -69.0

E: 78.0

W: 77.0

Temporal Coverage

Start Date: 1999-09-30

Stop Date: 2002-03-31

Paleo Temporal Coverage

Chrono Unit:

PHANEROZOIC > PALEOZOIC

Chrono Unit:

PROTEROZOIC

Location Keywords

CONTINENT > ANTARCTICA > Rauer Group

GEOGRAPHIC REGION > POLAR

Science Keywords

PALEOCLIMATE > LAND RECORDS > STRATIGRAPHIC SEQUENCE

SOLID EARTH > ROCKS/MINERALS/CRYSTALS

ISO Topic Category

CLIMATOLOGY/METEOROLOGY/ATMOSPHERE

GEOSCIENTIFIC INFORMATION

Quality Values provided in temporal coverage are approximate only.

Access Constraints These data are not yet publicly available.

Use Constraints This data set conforms to the PICCCBY Attribution License
(http://creativecommons.org/licenses/by/3.0/).

Ancillary Keywords

ANTARCTICA

FILLA PARAGNEISS

Data Set Progress

COMPLETE

Data Center

Australian Antarctic Data Centre, Australia

Data Center URL: http://data.aad.gov.au

Data Center Personnel
Name: DATA OFFICER AADC Phone: +61 3 6232 3244 Fax: +61 3 6232 3351 Email: metadata at aad.gov.au Contact Address: Australian Antarctic Division 203 Channel Highway City: Kingston Province or State: Tasmania Postal Code: 7050 Country: Australia

Distribution

Distribution Media: HTTP

Distribution Size: 2524 kb

Distribution Format: excel, pdf

Fees: free

Personnel

CHRISTOPHER KAY WILSON

Role: INVESTIGATOR

Role: TECHNICAL CONTACT

Role: DIF AUTHOR

Phone: +61 3 9344 6538

Fax: +61 3 9344 7761

Email: c.wilson at earthsci.unimelb.edu.au

Contact Address:

School of Earth Sciences

University of Melbourne

City: PARKVILLE

Province or State: Victoria

Postal Code: 3052

Country: Australia

Publications/References

D.E. Kelsey, R.W. White, R. Powell, C.J.L. Wilson and C.D. Quinn (2003), New constraints on metamorphism in the Rauer Group, Prydz Bay, east Antarctica., J. Metamorphic Geol., 21, 739-759

D.E. Kelsey, R.W. White and R. Powell (2003), Orthopyroxene-sillimanite-quartz assemblages: distribution, petrology, quantitative P-T-X constraints and P-T paths., J. Metamorphic Geol., 21, 439-453

Creation and Review Dates

DIF Creation Date: 2000-08-09

Last DIF Revision Date: 2011-05-10

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