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Diverse terranes and mineral potential of the Casey Inlier, Arunta Region

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Title: Diverse terranes and mineral potential of the Casey Inlier, Arunta Region


1
Diverse terranes and mineral potential of the
Casey Inlier, Arunta Region
Dorothy Close1, Ian Scrimgeour1, Chris Carson2,
Jon Claoué-Long2
1 NTGS, 2 Geoscience Australia
2
Casey Inlier southeastern exposure of the
Arunta Region
  • Casey Inlier
  • a previously unmapped basement inlier within the
    NE Neoprot to Palaeozoic Amadeus Basin
  • comprises 4 distinct domains based on
    lithological packages, protolith ages, structural
    and metamorphic histories mafic geochemistry
  • contains fertile mineral system source rocks
    with structural reactivation through the
    Proterozoic to Palaeozoic

3
Casey Inlier 4 different domains evidence
Lithologies/protolith ages/peak metamorphism
Eastern
1845
1817
Lithologies metapelites, metapsammite, graphitic
schists, calcsilicates, marble, quartz magnetite
units, felsic mafic to ultramafic
intrusives Protolith ages sediments 1845 6
Ma granites 1817 3.9 Ma Peak metm
deformation amphibolite facies/NNW-SSE trending/
age unknown Arunta Correlation Aileron Province
4
Casey Inlier 4 different domains evidence
Lithologies/protolith ages/peak metamorphism
Central
1768
1865
1845
1817
1770
Lithologies migmatitic metapsammites and
metapelites, felsic mafic intrusives Protolith
ages sediments 1865 5 Ma, granites 1770
4.4 Ma Peak metm deformation 1) early E-W
migmatitic fabric 1768 4.4 Ma 2) overprinted
by NNW-SSE amphibolite facies 3) zones of
greenschist retrogression Arunta Correlation
Aileron Province
5
Casey Inlier 4 different domains evidence
Lithologies/protolith ages/peak metamorphism
Cover
1235
1768
1865
1845
1817
1770
Lithologies interlayered quartzite,
conglomerates, porphyroblastic andalusite
staurolite chlorite muscovite
schist Protolith ages sediments 1235 74
Ma Peak metm deformation Upper greenschist
facies NE vergent isoclinal folding Arunta
Correlation pre Amadeus Basin
6
Casey Inlier 4 different domains evidence
Lithologies/protolith ages/peak metamorphism
Western
1638
1235
1642
1768
1865
1845
1817
1770
Lithologies dominantly magmatic domain biotite
granites, muscovite granites, leucogranites,
mafic intrusives Protolith ages granites 1638
4.2 Ma, 1642 3.5 Ma, no inheritance Peak metm
deformation 1) E-W foliation 2) NNW-SSE
amphibolite facies fabric Arunta Correlation
Warumpi Province
7
Casey Inlier 4 very different domains evidence
Contrasting REE mafic geochemistry across the
domains
Flat REE pattern n 14
Positive REE pattern n 10
Steep REE pattern n 4
8
Casey Inlier Western domain eastern Warumpi
Province
Extension of the Warumpi Province (1690-1600 Ma
terrane)
9
Au distribution within the Casey Inlier
Arthur Popes 21 ppb Au, 12 ppm Ag, 10 ppm Pt, 5
ppm Pd, 8 Cu
Sabminco 1989 stream sed samples
NTGS WR samples
CR 19890017 Stream sed Au ppt Range lt50 to
6400 ppt
NTGS Whole Rock Au ppb Range 0 to 41 ppb
10
Au distribution within the Casey Inlier
Arthur Popes 21 ppb Au, 12 ppm Ag, 10 ppm Pt, 5
ppm Pd, 8 Cu
Sabminco 1989 stream sed samples
NTGS WR samples
CR 19890017 Stream sed As ppm Range 0 to 10
ppm
NTGS Whole Rock As ppm Range 0 to 165 ppm
11
Cu distribution within the Casey Inlier
Arthur Popes 21 ppb Au, 12 ppm Ag, 10 ppm Pt, 5
ppm Pd, 8 Cu
Sabminco 1989 stream sed samples
NTGS WR samples
CR 19890017 Stream sed Cu ppm Range 0 to 15
ppm
NTGS Whole Rock Cu ppm Range 3 to 79 900 ppm
12
Cu distribution within the Casey Inlier
Arthur Popes 21 ppb Au, 12 ppm Ag, 10 ppm Pt, 5
ppm Pd, 8 Cu
NTGS WR samples
NTGS Whole Rock Ni ppm Range 0 to 1600 ppm
NTGS Whole Rock Cr ppm Range 0 to 1850 ppm
13
Cu distribution within the Casey Inlier
Arthur Popes 21 ppb Au, 12 ppm Ag, 10 ppm Pt, 5
ppm Pd, 8 Cu
NTGS WR samples
NTGS Whole Rock Pt ppm Range 0 to 10 ppm
NTGS Whole Rock Pd ppm Range 0 to 5 ppm
14
Casey Inlier 4 very different domains summary
  • Summary
  • Casey Inlier comprises 4 structurally bound
    domains with different lithologies, protolith
    ages, metamorphic/structural histories and mafic
    geochemistry
  • Eastern and Central domains form an extension of
    the Aileron Province with sedimentary packages
    that have affinities to the Lander formation
  • Western domain forms the eastern extension of
    the prospective 1690-1640 Ma Warumpi Province
  • Eastern, Central and Western domains all
    affected by NE vergent amphibolite grade
    deformation (probably 1590-1560 Ma Chewings Event)

15
Casey Inlier 4 very different domains summary
  • Summary
  • Cover domain represents a little known, poorly
    preserved sedimentary package that predates the
    Amadeus Basin
  • All domains affected by a previously
    unrecognised NE vergent upper greenschist
    deformation b/n 1237 1000 Ma
  • Deposition of the Neoprot to Palaeozoic Amadeus
    BAsin
  • Upper crustal fault reactivation during the
    400-300 Ma Alice Springs Orogeny
  • Eastern domain contains the Arthur Popes
    prospect and contains elevated values of Au, As,
    Cu, Pt, Pd, Ni, Cr
  • Central domain contains mafic units with
    elevated Pt, Ni, Cr
  • Western domain contains mafic intrusives with
    elevated Au and Cr
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