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-21-. in the foliation plane (parallel or sub—parallel to bedding) has a skewed unirnodal distribution. A comparable plot for planes normal to foliation has a symmetrical unimodal distribution. These imply that the original volcanic pebbles were deposited with their original iCY planes parallel or sub—parallel to the bedding plane with their longest axes generally easterly.
-22- MINERAL POTENTIAL IN CREENSTONE BELTS OF NORTHWESTERN ONTARIO R. W HUTCHINSON University of Western Ontario ABSTRACT The distribution of producing metal mines has, until recently, suggested that the Archaean greenstone belts of northwestern Ontario were favourable only for gold deposits and iron formations, in con— trast to similar belts of northeastern Ontario — northwestern Quebec that are obviously favourable f or base metal suiphides as well as gold and iron formations. The metal distribution is no longer so distinctive. Important base metal deposits were discovered at Manitouwadge in 1953 and recently near Uchi and Sturgeon Lakes in northwestern Ontario. Important iron production has commenced from Algoman—type iron formations in eastern Ontario. Detailed geologic work in the northwestern Ontario greenstone belts shows extensive development of rhythmically—banded, shelf—fades "Coutchiching—type" rocks, of immature, first—cycle "Tiiniskarning—type" rocks and of thick, well differentiated "Keewatin—type" volcanic sequences1 All these have lithologic counterparts in the Abitibi region, where the latter are long—recognized hosts for base—metal sulphides, and where the stratigraphic succession of the three "types" appears similar. Age dating methods fail to reveal any significant age differences between these rocks in northwestern Ontario and their counterparts in eastern Ontario—Quebec. All these features suggest that the greenstone belts of northwestern Ontario are similar in origin and age to those farther southeast, and therefore that all have more—or—less equivalent mineral potential for base metal sulphide, iron formation, and gold deposits. These three types of deposit appear metallogenically characteristic of Archaean sequences. They may be lithofacies—related equivalents of one another; the base metal sul— phides forming under reducing conditions near exhalative centres, the iron formations forming under oxidizing conditions remote from the centres, and the gold of similar exhalative derivation but perhaps initially "fixed" in other sedimentary lithofacies such as pyritic or carbonate iron formations, or montmorillonitic, volcanic—derived Timiskaming sediments. Locally, as at Manitouwadge, the northwesterly greenstone belts have been more highly metamorphosed than those of Ontario—Quebec,
Page 1 and 2: -ç — — I: .t. F Geology Superi
Page 3 and 4: TABLE OF CONTENTS INSTITUTE DIRECTO
Page 5 and 6: -2- "P R 0 G R A M" Tate day, Ma9 5
Page 7 and 8: -4- SESSTOM 2 1.00 Business Meeting
Page 9 and 10: -6- F'viday, May Slit, 1970 Page No
Page 11 and 12: -8- SYNTHESIS OF EARLY PRECAMBRIAN
Page 13 and 14: -10- THE SOUTHERN ASSOCIATED PART O
Page 15 and 16: -12- THE STRUCTURE OF THE NORTHERN
Page 17 and 18: -14- MT. ST. JOSEPH - AN ARC}IAEAN
Page 19 and 20: -16- A MODEL FOR TECTONIC VARIATION
Page 21 and 22: -18- EARLY PRECAMBRIAN GEOLOGY OF T
Page 23: DEFORMATION OF THE SEINE CONGLOMERA
Page 27 and 28: -25-- ROOT SEVERANCE AND TECTONIC T
Page 29 and 30: -27- STRUCTURE OF ThE DULUTH GABBRO
Page 31 and 32: -29- 1. Department of Geology and G
Page 33 and 34: -31-. KEWEENANWAN COPPER DEPOSITS I
Page 35 and 36: —33- The youngest rocks in the ar
Page 37 and 38: -35- STRUCTURAL AN!) METAMORPHIC HI
Page 39 and 40: -37.- ARCHAEAN VOLCANIC STRATIGRAPH
Page 41 and 42: ______ __________ _____ IDEALIZED S
Page 43 and 44: —41- (3) The upper liimit of 30 p
Page 45 and 46: -43- Fjgire 2 The revised classific
Page 47 and 48: —45— EVIDENCE FOR A TROPICAL CL
Page 49 and 50: —47-- WIDESPREAD OCCURRENCE OF AL
Page 51 and 52: —49— PROTEROZOIC ROCKS IN THE T
Page 53 and 54: —51— Guide to the Proterozoic R
Page 55 and 56: WEST EAST f * . . .. . . S S S S 5S
Page 57 and 58: ________ — ;—=- — —-- —
Page 59 and 60: —53— The uppermost submember of
Page 61 and 62: —55— Morey notes that sediment
Page 63 and 64: —57— (c) layered mafic bodies,
Page 65 and 66: —59— DESCRIPTION OF STOPS Milea
Page 67 and 68: —6 P- Note downwarping of beds on
Page 69 and 70: —63— Note the lenticular chert
Page 71 and 72: —65— 0.0 From the intersection
Page 73 and 74: —67— STOP 16 In the roadcut to
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—69— ThE BEARDMORE-GERALDTON BE
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—72— the Quetico belt by Stockw
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—72 B— ABITIBI BELT —ø.jsour
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—74— Most of the metavolcanic
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—76— SELECTED REFERENCES Anonym
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—78— Stockwell, C. II., 1964; F
Page 87 and 88:
—80— ae DESCRIPTION OF STOPS 0.
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—82— STOP 8 (Paint Lake Fault).
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-84— Outcrops near the road are o
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—87— Guide to the Port Coldwell
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AGE RELATIONSHIPS The volcanosedime
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.• ____________________ . — .._
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-I- + -4.- -I- - - - - — - 4- ; E
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—93— (3) 'flow—layering' exhi
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GOSSAN ZONE IN SULPHIDE BEARING GAB
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—95— (3) feldspars variably fol
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—97— Fig. 6c Fig. 6b ;' TRAIL T
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Pig. 7 West contact of CROSS SECTIO
Page 111:
PRINCE AR THUR HOTEL ® 0 ® SHOREL
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