Overview of Results from the Greenstone ... - Geology Ontario

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mesocumulate). The Stoughton–Roquemaure assemblage is dominated by pillowed flows with lesser sheet-like flows. Massive flows are frequently associated with pillowed flows, whereas differentiated flows only occur in specific parts of the Stoughton–Roquemaure assemblage. The Tisdale and Kidd– Munro assemblages contain more sheet-like flows than pillowed flows. Both massive and differentiated flows are frequently present in these assemblages, however, the massive flows are characterized by abundant ortho- to adcumulate lithologies with fewer olivine-phyric lithologies and differentiated flows are characterized by thick orthocumulate lower zones with thin spinifex-textured upper zones. Volcaniclastic komatiitic rocks occur in the Kidd–Munro and Tisdale assemblages, and are typically autoclastic (i.e., flow-top breccia hyaloclastite or reworked hyaloclastite rather than pyroclastic rock). Only the Kidd–Munro and Tisdale assemblages contain a large proportion of komatiitic peridotite and Figure 25. General geology of the Abitibi greenstone belt around Timmins showing the different nickel showings or deposits with the year of discovery. 62
komatiitic dunite in massive cumulate lithologies, which are interpreted to represent lava channels or the channel-flow facies of channelized sheet flows and high-level sills. These environments are important, as they are the favoured facies to host Ni-Cu-(PGE) mineralization (Lesher 1989). This is consistent with the presence of komatiite-hosted Ni-Cu-(PGE) deposits only within the Kidd–Munro (e.g., Marbridge, Alexo, and Dundonald) and Tisdale assemblages (e.g., Texmont, Redstone, Hart, and Langmuir deposits). Table 6. Summary of geochemical (or lithological) and textural facies for the komatiitic rocks in different assemblages of the Abitibi greenstone belt (modified from Houlé 2001). 63
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ISBN 0-7794-8652-8 THESE TERMS GOVE
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ONTARIO GEOLOGICAL SURVEY Open File
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Contents Abstract .................
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Appendix 1. Thermal Ionization Mass
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Miscellaneous Release—Data 155 Di
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The Timmins area and Kirkland Lake-
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Overview of Results from the Greens
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3. The geophysical subproject funct
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The following Preliminary Maps have
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Samples with zircons analyzed by SH
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Figure 4. U/Pb concordia plots of T
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Figure 6. U/Pb concordia plot of TI
Page 38 and 39: Targeting of several of these overg
Page 40 and 41: Figure 10. U/Pb SHRIMP results from
Page 42 and 43: In northwest Cleaver Township, a fe
Page 44 and 45: SHRIMP U/Pb dating was carried out
Page 46 and 47: Stratigraphic Framework In this sec
Page 48 and 49: PACAUD ASSEMBLAGE The 2750 to 2735
Page 50 and 51: The iron formation and chert brecci
Page 52 and 53: (thickness) of banded iron-poor iro
Page 54 and 55: clast conglomerates at the top of t
Page 56 and 57: BLAKE RIVER ASSEMBLAGE Lower Part T
Page 58 and 59: The Krist formation consists of cal
Page 60 and 61: Timmins Area In the Timmins area, t
Page 62 and 63: Kirkland Lake-Larder Lake Area Hyde
Page 64 and 65: Intrusion Framework The plutonic ro
Page 66 and 67: The youngest dated synvolcanic mafi
Page 68 and 69: Albitite dikes are crosscut by gold
Page 70 and 71: Worming Geophysical Data Treatment
Page 72 and 73: In Timmins, the first generation of
Page 74 and 75: Figure 20. Geological sketch map of
Page 76 and 77: from Halfmoon Lake, only 2 km to th
Page 78 and 79: The Blake River Group is divided in
Page 80 and 81: Figure 22. Geological map of Munro
Page 82 and 83: Mine stratigraphic succession, have
Page 84 and 85: Figure 24. Geological map of Currie
Page 86 and 87: Table 5. Simplified classification
Page 90 and 91: Shaw Dome Area GEOLOGICAL SETTING T
Page 92 and 93: 66 Figure 26. A generalized map of
Page 94 and 95: 1999) in their REE patterns and oth
Page 96 and 97: plumbing system geometrically stabl
Page 98 and 99: GOLD MINERALIZATION Production comm
Page 100 and 101: The Narrows Break mineralized zone,
Page 102 and 103: Table 7. Diagnostic mineral assembl
Page 104 and 105: anomaly and the Dome Mine (Figures
Page 106 and 107: Recommendations • Further testing
Page 108 and 109: of the inversion product. (Recent a
Page 110 and 111: the evidence for pre-Pacaud strata
Page 112 and 113: plutonism suggests the onset of reg
Page 114 and 115: Watkinson and Comba 1989; Gibson an
Page 116 and 117: The Kirkland Lake giant gold deposi
Page 118 and 119: The Timmins and Kirkland Lake-Larde
Page 120 and 121: References Ames, D.E., Bleeker, W.,
Page 122 and 123: Bleeker, W., Parrish, R.R. and Sage
Page 124 and 125: Galley, A.G., Pilote, P. and Davis,
Page 126 and 127: Heather, K.B., Percival, J.A., Mose
Page 128 and 129: Lesher, C.M., 1989. Komatiite-assoc
Page 130 and 131: Péloquin, A.S., Verpaelst, P., and
Page 132 and 133: Stern, R.A. 1997. The GSC sensitive
Page 134 and 135: 108 This page left blank intentiona
Page 136 and 137: THERMAL IONIZATION MASS SPECTROMETR
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04BHA-0462 Granophyre, Kamiskotia G
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contrastingly have been dated near
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The revised age of 2672.8±1.1 Ma f
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fraction (A1a) also overlaps concor
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04JAA-0010 Albitite dike cutting Ti
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Therefore, on geochronological grou
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Three individual grains were analyz
Page 152 and 153:
03VOI-0422-1 Trachytic lava, Timisk
Page 154 and 155:
03SJP-115-1 Monzonite, Clifford sto
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the original Corfu (1993) age, only
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Table A1. U/Pb isotopic data for zi
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206 Sample Analysis Description Wei
Page 162 and 163:
Appendix 2 Sensitive High-Resolutio
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Table A2. Ion microprobe (SHRIMP II
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Table A2. continued Struct. U Th Pb
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Table A2. continued 204 U Th Pb* Pb
Page 170 and 171:
Table A2. continued 204 U Th Pb* Pb
Page 172:
Metric Conversion Table Conversion
Page 175 and 176:
Chart A. Magnetic and Gravity Three
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