Table 7. Diagnostic mineral assemblages (point data) are <strong>the</strong> basis for <strong>the</strong> definition <strong>of</strong> metamorphic grade in each metamorphic zone. Metamorphic zones (see also Thompson 2005, Figure 2, back pocket) are derived <strong>from</strong> <strong>the</strong> grade in one or more rock associations. The first digit <strong>of</strong> <strong>the</strong> two-digit number in each cell indicates <strong>the</strong> rock association. The second digit indicates <strong>the</strong> relative metamorphic grade for <strong>the</strong> rock association (higher number, higher grade). The relative positions <strong>of</strong> <strong>the</strong> boundaries in rock associations 2 to 7 that correspond approximately to <strong>the</strong> lower/upper greenschist zone boundary on <strong>the</strong> map are inferred. The precise positions <strong>of</strong> <strong>the</strong>se boundaries relative to each o<strong>the</strong>r have yet to be calibrated. Mineral name abbreviations: ab - albite, act - actinolite, am – amphibole undifferentiated, and - andalusite, bt - biotite, cb – carbonate (ankerite, calcite, dolomite, magnesite, siderite), cht - chlorite, crd - cordierite, ctd - chloritoid, cum - cummingtonite, diop - diopside, epg - epidote group, grt - garnet, gru - grünerite, hn - hornblende, kf - potassium-feldspar, mt - magnetite, plg - plagioclase, se - serpentine, sil - sillimanite, st - staurolite, tlc - talc, trm - tremolite, wm - white mica (muscovite, paragonite, talc). Metamorphic Grade Rock Association 1) Metabasites: metabasalt/gabbro/diabase, greenstone, amphibolite, meta-andesite 2) Metaquartz<strong>of</strong>eldspathic rocks: metarhyolite/dacite, qtz-fp metaporphyry, felsic metavolcaniclastite, metawacke 3) Metamorphosed ultramafic rocks: metakomatiite, metaperidotite/dunite 4) Metamorphosed aluminum-rich rocks: metashale/siltstone, metahydro<strong>the</strong>rmal alteration 5) Chemical metasedimentary rocks, meta-iron formation 6) Metamorphosed granitoids: metagranite to metatonalite 7) Metamophosed carbonate-rich rocks: carbonate metasediments, meta-interpillow rock, metahydro<strong>the</strong>rmal alteration, cht-cb schist 8) Unmetamorphosed granitoids: granite to tonalite Sub-greenschist Facies Subgreenschist Zone Lower Greenschist Zone Greenschist Facies Amphibolite Facies Metamorphic Zones on Map Upper Greenschist Zone Transition Zone Diagnostic Mineral Assemblages 10 prn, prn-pu 11 act-cht-epg-ab 12 act-hn 13 hn-plg(calcic) 20 prn, prn-pu cht-wm 30 21 cht-wm cht-kf cht-wm-cb 31 cht-tlc-cb, se-cht cht-tlc-se-cb 22 bt epg-act 32 clinoamphibole (trm, cum) 40 41 cht-wm 42 bt, bt-grt, ctd-cht 50 minesotaite greenalite 51 qtz-cht, cht-cb, mt-qtz 23 bt-hn 52 clinoamphibole (cum/gru), am-grt, two am 60 prn, prn-pu 61 cht-kf, cht-wm 62 bt, bt-epg, bt-epg-am 70 71 cht-cb-qtz cht-cb-wm-qtz 72 bt-cht-cb epg-cht-am-cb 80 no metamorphic minerals Amphibolite Zone 43 crd-and/sil-bt st-and/sil-bt, crd orthoamphibole 73 diop-am-grt, hn-bt-qtz 76
77 Figure 27. Simplified page-size version <strong>of</strong> <strong>the</strong> metamorphic map <strong>of</strong> <strong>the</strong> Timmins–Kirkland Lake area (<strong>from</strong> Thompson 2005, p.6). To improve clarity, <strong>the</strong> metamorphosed granitoids, <strong>the</strong> UTM grid, and gold occurrences have been omitted. Note, for example, <strong>the</strong> spatial relationship between metamorphic anomalies defined by <strong>the</strong> boundary between <strong>the</strong> lower and upper greenschist zones and current and past-producing gold mines east and nor<strong>the</strong>ast <strong>of</strong> Timmins and east <strong>of</strong> Kirkland Lake.
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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
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Targeting of several of these overg
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Figure 10. U/Pb SHRIMP results from
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In northwest Cleaver Township, a fe
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SHRIMP U/Pb dating was carried out
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Stratigraphic Framework In this sec
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PACAUD ASSEMBLAGE The 2750 to 2735
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The iron formation and chert brecci
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- Page 60 and 61: Timmins Area In the Timmins area, t
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- Page 80 and 81: Figure 22. Geological map of Munro
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- Page 86 and 87: Table 5. Simplified classification
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- Page 92 and 93: 66 Figure 26. A generalized map of
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- Page 98 and 99: GOLD MINERALIZATION Production comm
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- Page 114 and 115: Watkinson and Comba 1989; Gibson an
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- 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
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- Page 140 and 141: contrastingly have been dated near
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03VOI-0422-1 Trachytic lava, Timisk
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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
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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
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Table A2. continued 204 U Th Pb* Pb
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Metric Conversion Table Conversion
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Chart A. Magnetic and Gravity Three