Tectonostratigraphic architecture and uplift history of the Eastern ...

More documents

Recommendations

Info

PhoenixThe Phoenix gold deposit is located 22 km south of Laverton, and lies on the Childe Harold Fault. Itis situated on the western edge of the Granny Smith Basin on the Laverton Shear Zone. Gold ishosted within dextral–normal shear reactivation of boundary between Granny Smith (first stage)basin sediments on the east and dolerite and basalts of the older mafic sequence on the west.Four deformational stages have been defined at Phoenix. The first involved the development of apervasive steeply dipping foliation in all rocktypes. This stage folded(?) the stratigraphy into itssteep attitude, and may have involved an element of thrusting to the west. The second stage wasassociated with gold deposition(?) and is recorded by strongly partitioned dextral shearing withfolds that are locally transposed (see photograph below). The Stage 3 deformation overprintinvolved a return to W-directed reverse faulting during E–W contraction. The final stage wasextensional, with the development of low-angle crenulations, normal faults and minor quartz veins(Fig. 14).Figure 14: Summary structural stratigraphy of PhoenixEventnumberRegionsof σ 1Simplifiedview of σ 1Characteristicstructuresof deformationyoungest4Flat crenulation cleavageveins &normal faults303Reverse shearing21263AuDextral normal shearFolding and foliationTransposed folds during dextral shear1Foliation021BeddingKey Point:Gold is associated with NE–SW contraction duringdextral transpression shear.oldest525
Gladiator SouthThe Gladiator South pit is located ~ 5 km west of Laverton along the Childe Harold Fault. Most ofthe pit is hosted by reddened polymictic conglomerate with rounded mafic clasts. Porphyry dykeslocally occur. The pit is dominated by a well–developed penetrative foliation and shallowly dippingstretching lineation. The dominant kinematics is dextral–reverse for the Stage 2 deformation.Internal foliations in the microlithons between shear planes attest to an earlier fabric that is nowlargely transposed.Gold is interpreted to have been deposited during the dextral–reverse shearing stage. Less intensebrittle reverse and dextral faults that developed during E–W contraction overprint the main fabric inthe pit. The last stage of deformation is the development of low-angle crenulations probablydeveloped during extension.Figure 15: Summary structural stratigraphy of Gladiator SouthEventnumberRegionsof σ 1Simplifiedview of σ 1Characteristicstructuresof deformationN46youngestCrenulationclevage313Kinks and brittledextral faults249Contemporaneousdextral & reverseS-C fabricsAu1?Earlier internalfabric recognisedfrom thin sections05oldestBedding &porphyryintrusionDextral reverse shearingKey Point:Good evidence for strain partitioning into strike–slip (dextral) and reverse(NE–over–SW) shear.26
Page 2 and 3: Tectonostratigraphic architecturean
Page 4: ForwardThis Geoscience Australia Re
Page 7 and 8: AppendicesAppendix 3 1Appendix 3.1:
Page 9 and 10: viii
Page 11 and 12: publish regional deformation event
Page 13 and 14: Swager (1997) interpreted the late
Page 16 and 17: numerous deposits along a broad tra
Page 18 and 19: n=6826N~100kmFigure 5: Regional fol
Page 20 and 21: During the course of the study the
Page 22 and 23: the related extension structures do
Page 24 and 25: Figure 8 continued: Case examples a
Page 26 and 27: Structural history of the terranes
Page 28 and 29: Barrett WellBarrett Well is a serie
Page 30 and 31: King of CreationThe King of Creatio
Page 32 and 33: Kurnalpi TerraneThe Kurnalpi Terran
Page 36 and 37: Sunrise DamSunrise Dam is a multi-m
Page 38 and 39: MurphyThe Murphy granite is a High-
Page 40 and 41: LancefieldThe Lancefield Au deposit
Page 42 and 43: JupiterJupiter is a spectacular gol
Page 44 and 45: WestraliaThe Westralia pit is the l
Page 46 and 47: PorphyryThe Porphyry deposit is hos
Page 48 and 49: Nambi and Mt RedcliffeThe Mertondal
Page 50 and 51: CelticThe Celtic deposit is located
Page 52 and 53: RainbowThe Rainbow Granite Complex
Page 54 and 55: ButterflyButterfly is a small, rela
Page 56 and 57: ParmeliaThe Parmelia deposit is one
Page 58 and 59: GwaliaThe Gwalia Au deposit is loca
Page 60 and 61: Victor WellVictor Well is a small p
Page 62 and 63: Jasper HillJasper Hill is a small s
Page 64 and 65: AndersonThe Anderson Granite is an
Page 66 and 67: North WellThe North Well pit is the
Page 68 and 69: Twin HillsThe Twin Hills site is lo
Page 70 and 71: Mt OwenMt Owen is a small pit locat
Page 72 and 73: FairylandThe Fairyland deposit is l
Page 74 and 75: Lawlers EastThe Lawlers East pit li
Page 76 and 77: Genesis-New HollandThe Genesis-New
Page 78 and 79: RedeemerThe Redeemer deposit is loc
Page 80 and 81: Pepperil HillThe Pepperil Hill monz
Page 82 and 83: RiverinaThe Riverina Gneiss site is
Page 84 and 85:
Bottle Tree CreekThe Bottle Tree Cr
Page 86 and 87:
Key Learnings and SynthesisIntroduc
Page 88 and 89:
WEFigure 54: Schematic diagram illu
Page 90 and 91:
In summary, the D1 event was extens
Page 92 and 93:
Figure 59: Simplified interpretatio
Page 94 and 95:
D2Intensity shown assize and colour
Page 96 and 97:
Figure 62: Lack of D2 compression o
Page 98 and 99:
Late Basins are developed under con
Page 100 and 101:
Figure 67: Photographs of the core
Page 102 and 103:
The 01GASNY1 seismic line is a high
Page 104 and 105:
Figure 71: E-W seismic line showing
Page 106 and 107:
Figure 72: Williams & Curry (1992)
Page 108 and 109:
Summary of D2/D3In summary, the D2
Page 110 and 111:
Figure 77: Map of D4 structures and
Page 112 and 113:
Figure 78: Map of D5 structures and
Page 114 and 115:
Pink - granites, Yellow -sediments
Page 116 and 117:
Figure 80. A synthesis of thetiming
Page 118 and 119:
AcknowledgementsThis project has be
Page 120 and 121:
Keays, W.R.H. Ramsay, and D.I. Grov
Page 122 and 123:
Myers, J.S., 1997. Preface; Archaea
show all

Tectonostratigraphic architecture and uplift history of the Eastern ...

Create successful ePaper yourself

Delete template?

Save as template?