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- -a —94— STOP lB XENOLITH-HYBRIDIZED GABBRO—BANDED GABBRO (Fig. 2) A large, relatively inhomogeneous, xenolith of anatexite appears to be engulfed within massive, inclusionbearing, hybridized gabbro. Massive gabbro is overlain by gabbro with discontinuous and/or disturbed layering, and moderately well developed foliation of plagioclase. These gabbros are essentially two pyroxene, olivine poor, bictite—oxide (magnetite present up to 15 percent) rich, rocks. STO? 1C GABBROS - LAURVIKITES (Fig. 2) Continuation of traverse northward, along Highway 17, across layered gabbros, with zones of anatexite and intruded by dikes of laurvikite; and layered laurvikites. The gabbros show; (1) rhythmic (and cryptic) layering; (2) foliated and possibly lineated fabric as exhibited by plagioclase and clinopyroxene; (3) zones of reaction inclusions; (4) several ring (?) dikes, with associated apophyses, of láurvikite. Greater volume of dikes is indicative of the nearness of contact with overlying laurvikites. Dike emplacement occurred during periods of gabbro extension. The gabbros contain pagioclase, clinopyroxene, olivine (up to Fa75±5) with minor, but significant amounts of ilmenomagnetite, biotite, sodic amphibole, apatite, idding— site, sulf ides, and antigorite. The contact between overlying, layered laurvikites and layered gabbros appears conformable and gradadional over a short distance. The laurvikites show; (1) zones of abundant xenoliths; (2) colour variation from dark green to red corresponding to a transition, apparently gradational and cyclic, from a more melanocratic, anhydrous mineralogy, further characterized by the presence of hematite perthite;
GOSSAN ZONE IN SULPHIDE BEARING GABBRO, NOTE PRESENCE OF 'BOULDERY' XENOLITHS Dr COUNTRY ROCKS. ON -LAP CONTACT RELATIONS TYPICAL OF GABBROIC CUPOLA DEVELOPMENT. GABBRO CHARACTERIZED BY (I) MARKED VARIATION 1N DEGREE OF CRYSTAL — LINITY APPARENTLY REFLECTING AN AUREOLE ROCKS le ANATEXITES ARE CHARACTERIZED 0Y Iii FLOW LINES, SCHLIEREN, WHICH PARALLEL CONTACT WITH GABBRO — DRAG FOLDS ARE COMMON. (2) 'BLEACHED APPEARANCE. (3 PRESENCE OF INCLUSIONS OF LOCAL LITHOLOGIES AND RESTITE. (1 PRESENCE OF RHEOMORPHIC VEINS AND DIKES GRANOPHYRIC IN COMPOSITION WITH TOURMgLINE + PREHNITE. (2) IRREGULAR COOLING HISTORY. PRESENCE OF SULPHIDES IN COARSER — GRAINED, HYBRIDIZED PHASES. PRESENCE OF NUMEROUS INCLUSIONS OF COUNTRY ROCK. PRESENCE OF NUMEROUS COMPOSITE DIKES OF LAURVIKITE. ---1 TRACE OF PORTION OF PERIPHERY OF GABBRO CUPOLA I / / / POSTULATED LI THOLOG Y Fig. 3 Contact relations shown at Stop la Stop la
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-ç — — I: .t. F Geology Superi
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TABLE OF CONTENTS INSTITUTE DIRECTO
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-2- "P R 0 G R A M" Tate day, Ma9 5
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-4- SESSTOM 2 1.00 Business Meeting
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-6- F'viday, May Slit, 1970 Page No
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-8- SYNTHESIS OF EARLY PRECAMBRIAN
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-10- THE SOUTHERN ASSOCIATED PART O
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-12- THE STRUCTURE OF THE NORTHERN
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-14- MT. ST. JOSEPH - AN ARC}IAEAN
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-16- A MODEL FOR TECTONIC VARIATION
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-18- EARLY PRECAMBRIAN GEOLOGY OF T
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DEFORMATION OF THE SEINE CONGLOMERA
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-22- MINERAL POTENTIAL IN CREENSTON
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-25-- ROOT SEVERANCE AND TECTONIC T
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-27- STRUCTURE OF ThE DULUTH GABBRO
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-29- 1. Department of Geology and G
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-31-. KEWEENANWAN COPPER DEPOSITS I
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—33- The youngest rocks in the ar
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-35- STRUCTURAL AN!) METAMORPHIC HI
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-37.- ARCHAEAN VOLCANIC STRATIGRAPH
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______ __________ _____ IDEALIZED S
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—41- (3) The upper liimit of 30 p
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-43- Fjgire 2 The revised classific
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—45— EVIDENCE FOR A TROPICAL CL
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—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
Page 75 and 76: —69— ThE BEARDMORE-GERALDTON BE
Page 77 and 78: —72— the Quetico belt by Stockw
Page 79 and 80: —72 B— ABITIBI BELT —ø.jsour
Page 81 and 82: —74— Most of the metavolcanic
Page 83 and 84: —76— SELECTED REFERENCES Anonym
Page 85 and 86: —78— Stockwell, C. II., 1964; F
Page 87 and 88: —80— ae DESCRIPTION OF STOPS 0.
Page 89 and 90: —82— STOP 8 (Paint Lake Fault).
Page 91 and 92: -84— Outcrops near the road are o
Page 93 and 94: —87— Guide to the Port Coldwell
Page 95 and 96: AGE RELATIONSHIPS The volcanosedime
Page 97 and 98: .• ____________________ . — .._
Page 99 and 100: -I- + -4.- -I- - - - - — - 4- ; E
Page 101: —93— (3) 'flow—layering' exhi
Page 105 and 106: —95— (3) feldspars variably fol
Page 107 and 108: —97— Fig. 6c Fig. 6b ;' TRAIL T
Page 109 and 110: Pig. 7 West contact of CROSS SECTIO
Page 111: PRINCE AR THUR HOTEL ® 0 ® SHOREL
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