THE GEOLOGY OF THE EAST ALBANY–FRASER OROGEN — A FIELD GUIDE

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    RECORD 2011/23

    THE GEOLOGY OF THE EAST ALBANY

    OROGEN A FIELD GUIDE

    Government of Western AustraliaDepartment of Minesand Petroleum

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    Government ofWestern Australia

    Department ofMinesand Petroleum

    Record 2011/23

    THE GEOLOGY OF THE EAST ALBANYFROROGEN A FIELD GUIDE

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    MINISTER FOR MINES AND PETROLEUMHon. Norman Moore MLC

    DIRECTOR GENERAL, DEPARTMENT OF MINES AND PETROLEUMRichard Sellers

    EXECUTIVE DIRECTOR, GEOLOGICAL SURVEY OF WESTERN AUSTRALIARick Rogerson

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    Contents

    Preface .............................................................................................................................................................The AlbanyFraser project: scope, collaborative work, and progress ......................................................

    The geology of the east AlbanyFraser Orogen a field guide: part 1

    Tectonic setting of the AlbanyFraser Orogen ....................................... ....................................... ...................

    Eastern Goldfields Superterrane subdivisions and geology ....................................... .........................

    Structural history of the Eastern Goldfields Superterrane ................................................................Isotopic constraints of the Eastern Goldfields Superterrane ..................................... .........................

    Gold mineralization in the Eastern Goldfields Superterrane ............................................................Eucla basement ........................................................................................................................................

    Tectonic subdivisions of the AlbanyFraser Orogen ................................................. ......................................

    Northern Foreland ....................................................................................................................................

    Munglinup Gneiss .............................................................................................................................Barren Basin Cycle 1 sediments ..........................................................................................................

    Stirling Range Formation ..................................................................................................................

    Mount Barren Group .........................................................................................................................

    Woodline Formation..........................................................................................................................

    Unnamed metasedimentary units ......................................................................................................Fly Dam Formation ...........................................................................................................................

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    Stop 8. Fraser Fault Zone .......................................................................................................................5

    Directions to Stop 9 ........................................................................................................................5

    Stop 9. The Eddy Suite ..........................................................................................................................5

    Directions to Stop 10 ......................................................................................................................5Stop 10. Granitic gneisses Eddy Suite? ............................................................................................5

    Directions to Kalgoorlie ..................................................................................................................5Excursion 2: Tropicana in a regional context ..................................... ....................................... ........................... 6

    Directions to Tropicana ...................................................................................................................6

    Geological overview .....................................................................................................................................6

    Tropicana Gold Project ..........................................................................................................................6

    Tropicana joint venture ownership ...................................... ........................................ .................... 6Discovery and project history .........................................................................................................6

    Project geology ...............................................................................................................................6

    Host rocks .......................................................................................................................................6

    Stratigraphic architecture ................................................................................................................6Mineral deposit architecture ...........................................................................................................6

    Mineralization .................................................................................................................................7

    Day 1 .............................................................................................................................................................7

    Stop 1. Havana South ............................................................................................................................7Stop 2. Hat Trick Hill .............................................................................................................................7

    Locality 2.1. Hat Trick Hill ............................................................................................................7

    Locality 2.2. Hat Trick ridge ..........................................................................................................7Locality 2.3. Hat Trick ridge ..........................................................................................................7

    Day 2 .............................................................................................................................................................7

    Directions to Stop 3 ........................................................................................................................7

    Stop 3. Mafic to ultramafic rocks Archean greenstone?...................................................... ..............7Directions to Stop 4 ........................................................................................................................7

    Stop 4. Bobbie Point Metasyenogranite ..................................... ....................................... ..................... 7

    Di ti t St 5 7

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    21. Initial-Hf evolution plot comparing the Biranup Zone to the Northern Foreland and

    Archean fragment ..................................................................................................................................

    22. The 18001550 Ma hafnium evolution of the Biranup Zone .................................... .............................

    23. Initial-Hf evolution plot comparing the Fraser Zone and Recherche Supersuite to theBiranup Zone .........................................................................................................................................

    24. Probability density diagram of LuHf model ages: Fraser and Biranup Zones, andRecherche Supersuite ...........................................................................................................................

    25. Schematic tectonic evolution diagram for the Biranup Zone .................................... .............................

    26. Route and stops for Excursion 1 ........................................ ....................................... .............................

    27. Route and stops for Excursion 1, superimposed on the pre-Mesozoic interpreted bedrock geology ....

    28. Route and stops for Excursion 1, superimposed on a gravity data................................................ .........29. Route and stops for Excursion 1, superimposed on reduced-to-pole aeromagnetic data .......................

    30. Photographs of the Munglinup Gneiss (Excursion 1, Stop 1) ................................... .............................

    31. Photographs of Biranup Zone migmatite and Archean metasyenogranite (Excursion 1,

    Stops 2 and 4). ........................................................................................................................................32. Compilation of pseudosections from semipelites from Gnamma Hill and Mount Malcolm .................

    33. TeraWasserberg concordia plots and UPb ages of monazite analyses from Gnamma Hill

    and Mount Malcolm ..............................................................................................................................