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

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Figure 24. Geological map of Currie Township showing mineral occurrences (from Péloquin, Houlé and Gibson 2005, p.52). Mineral occurrences are 1) Currie (Tillex) (discussed in the text), 2) Anderson, 3) Foster, and 4) Reid. 58
The Currie (Tillex) showing occurs in the sediments and felsic tuffs of the upper Tisdale assemblage, and is within the same stratigraphic sequence that hosts the Cross Lake deposit (Ontario Geological Survey 2004b; Vaillancourt 2001). The mineralization described by Expatriate Resources, and described and observed in drill core from Kinross Gold Corporation and core in the Kirkland Lake Drill Core Library occurred as small stringers, and along bedding and foliation planes. The mineralized zones are commonly schistose, and numerous bedding parallel faults and sheared zones are observed in drill core. The mineralization in the Marker Horizon (Corfu and Noble 1992) of the upper Tisdale assemblage in Currie Township appears to be integrally associated with the sediments and felsic tuffs. A unit of particular interest within this assemblage corresponds to a magnetic high on the magnetic map and can be traced with few breaks across the entire township (Ontario Geological Survey 2004a). A second unit with a high magnetic signature occurs 200 to 300 m south of the first. The generally east-west orientation of these magnetic highs is subparallel to the interpreted upper Tisdale–lower Blake River assemblage boundary. These magnetic units may be stratigraphic and used as “marker units” within the Marker Horizon of the upper Tisdale assemblage. NICKEL-COPPER-PLATINUM GROUP ELEMENT MINERALIZATION SUBPROJECT This subproject is an affiliated OGS project that has been designed to complement the Discover Abitibi Greenstone Architecture Project (base metal and gold subprojects) by focusing on nickel-copper-platinum group element (PGE) mineralization in the Abitibi greenstone belt, but more specifically in the Shaw Dome area in the vicinity of known komatiite-associated deposits. This project represents an in-kind OGS contribution, which is both part of the Ontario Geological Survey core program and part of an ongoing PhD study by M.G. Houlé based at Laurentian University (LU) and the University of Ottawa (UO) on the physical volcanology and metallogenesis of komatiites in the Abitibi greenstone belt. Because of the nature of this in-kind OGS–LU–UO contribution, the Ni-Cu-(PGE) subproject section has progressed along a different time frame, so this section represents a summary rather than a complete assessment of the exploration potential of komatiite-associated deposits in the Abitibi greenstone belt. This part of the Discover Abitibi Greenstone Architecture subproject has focussed on the Shaw Dome for several reasons: 1) it is one of the areas in the Abitibi greenstone belt that contains known occurrences of komatiite-associated deposits, and 2) the Shaw Dome area provides an opportunity to examine the physical volcanology of komatiitic rocks at several scales (i.e., outcrop, property, and regional). The goals of this subproject are three-fold: 1. to evaluate the subvolcanic–volcanic architecture of the ultramafic rocks in the Shaw Dome 2. to evaluate the Ni-Cu-(PGE) mineral potential of the komatiitic rocks in the Shaw Dome 3. to extend what we have learned about the physical volcanology and metallogenesis of komatiitic rocks in the Shaw Dome to the scale of the Abitibi greenstone belt A multi-scale, integrated approach is critical in constraining the komatiite volcanic facies to aid in the interpretation of the volcanic architecture of komatiite flow fields and to assess the mineral potential for komatiite-associated Ni-Cu-(PGE) deposits. 59
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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 .................
Page 13:
Appendix 1. Thermal Ionization Mass
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Miscellaneous Release—Data 155 Di
Page 21:
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
Page 34 and 35: Figure 4. U/Pb concordia plots of T
Page 36 and 37: 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 86 and 87: Table 5. Simplified classification
Page 88 and 89: mesocumulate). The Stoughton-Roquem
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
Page 146 and 147:
04JAA-0010 Albitite dike cutting Ti
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Therefore, on geochronological grou
Page 150 and 151:
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
Page 164 and 165:
Table A2. Ion microprobe (SHRIMP II
Page 166 and 167:
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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Overview of Results from the Greenstone ... - Geology Ontario

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