Palaeoproterozoic to Mesoproterozoic Geology of North Queensland

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Other Proterozoic Inliers – Coen•Holroyd Group– Divided into 5 named units– Fine to medium-grained clastic sediments becomingmore pelitic to east– Some mafic rocks with MORB-like geochemistry– Isotopic constraints (OZCHRON)• Laminated slate has a MDA of 1560±22Ma with a widerange of older ages up to ~3300Ma• Phyllite has a MDA of 1550±10Ma with other agegroups at ~1593, ~1639 1696 and ~1750Ma• Zircon rims in a gneiss sample have an age of1430±10Ma•Edward River Metamorphic Group– Divided into 5 named units– Similar siliciclastic sedimentary rocks to Holroyd Group– No isotopic constraints•Sefton Metamorphics– Schist, quartzite, phyllite, greenstone, marble, calcsilicatesand ironstone– MDA zircon age of ~1200Ma – probably Neoproterozoic toCambrian
Correlations between InliersEtheridge Province – deposited between 1700and ~1620Ma; with multiple deformation eventsaccompanied by metamorphism from 1620 to1550Ma•Forsayth SubprovinceEtheridge Group (including EinasleighMetamorphics & McDevitt Metamorphics)•Yambo SubprovinceDargalong, Yambo, Newberry & CoenMetamorphic GroupsSavannah Province – MDA of ~1550-1560Ma sounconformable on Etheridge Province; possiblemetamorphism around 1430Ma and in Silurian-DevonianHolroyd & Edward River MetamorphicGroupsLanglovale Group (deposited in interval 1625-1550Ma) may be part of the Savannah Provinceor could be Kowanyama Province (unknownrocks in subsurface between Mt Isa andGeorgetown)
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Australian GovernmentGeoscience Aus
Page 3 and 4:
Tasman LineCOENINLIERDeep crustalse
Page 5 and 6:
50 kmSurface Geology - Georgetown r
Page 7 and 8:
Proterozoic Stratigraphic Units - S
Page 9 and 10:
Bernecker Creek Formation• Calcar
Page 11 and 12: Daniel Creek Formation• Very fine
Page 13 and 14: Dead Horse Metabasalt• Aphyric th
Page 15 and 16: Corbett Formation• Predominantly
Page 17 and 18: Lane Creek Formation• Mudstone an
Page 19 and 20: Cobbold Metadolerite• Mostly sill
Page 21 and 22: Cobbold Metadolerite• Mostly sill
Page 23 and 24: Townley Formation• Mudstone, silt
Page 25 and 26: Heliman Formation• Mudstone and s
Page 27 and 28: Langdon River Mudstone• Laminated
Page 29 and 30: Proterozoic Stratigraphic Units - S
Page 31 and 32: Langlovale Group• Malacura Sandst
Page 33 and 34: Palaeoproterozoic-Mesoproterozoic S
Page 35 and 36: Croydon Volcanic Group• Dominated
Page 37 and 38: Inorunie Group• Unconformably ove
Page 39 and 40: Proterozoic Stratigraphic Units - S
Page 41 and 42: Einasleigh Metamorphics• Psammope
Page 43 and 44: Einasleigh Metamorphics• Psammope
Page 45 and 46: Proterozoic solid geology - Georget
Page 47 and 48: Proterozoic structural domains & so
Page 49 and 50: Robertson River areaDeformation & m
Page 51 and 52: Deformation & metamorphismLangloval
Page 53 and 54: Palaeoproterozoic-Mesoproterozoic S
Page 55 and 56: Other Proterozoic Inliers - norther
Page 57 and 58: Tasman LineCOENINLIEROther Proteroz
Page 59 and 60: Other Proterozoic Inliers - Yambo
Page 61: Other Proterozoic Inliers - Coen•
Page 65 and 66: Correlating Georgetown and Mt Isa S
Page 67: Correlating Georgetown and Mt Isa S
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Palaeoproterozoic to Mesoproterozoic Geology of North Queensland

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