Program, Abstracts, and Guidebooks - University of Minnesota Duluth

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— 50A— lOji 1 (a): Microfossils in Gunflint chert from shore of Lake Superior near Schreiber, Ontario; spheroids are Huroniospora, filaments are Gunflintia. 1 (b): Side view of a weathered block of Sibley stromatolites; note polygonal columns of Conopiyton. Plate 1.
—51— Guide to the Proterozoic Rocks of the Northwestern Lake Superior Area, Ontario INTRODUCTtON: The Froterozoic rocks of Northwestern Ontario, which form part of the "Animikie" and Keweenawan unit; represent one of the most complete geological records of middle and late Proterozoic sedimentation and igneous activity in eastern North America. These rocks are virtually uninetamorphosed and only slightly deformed. Mineral deposits in these Proterozoic rocks include silver in Keweenawan dykes and the Rove Formation, iron in the Gunf lint Formation, nickel in mafic intrusive rocks, copper in various volcanic and sedimentary strata, and lead-zinc-barite associated with the Sibley Group. During the last century, the famous Silver Islet mine produced over three million dollars in silver. Currently, a minor amount of silver is recovered from the Creswel mine near Stanley (Fig. 1). GENERAL GEOLOGY The Proterozoic rocks lie unconforinably on the peneplained Archean surface. Archean meta volcanic and meta sedimentary rocks form a "belt" extending from west of Shebandowan to Thunder Bay city. Another similar belt crops out in the Schreiber—Big Duck Lake area (Pye, 1964). To the north, the Geraldton-Beardmore belt may be traced westward by aeromagnetic interpretation under Lake Nipigon, and may possibly join with the Lac Des Mille Lacs—Atikokan belts. The remainder of Archean outcrop is composed of intrusive and metamorphic granitic rocks, and small ultrainafic bodies. The Proterozoic rocks are subdivided as shown in Table 1. - TABLE 1 — Proterozoic Stratigraphy of Northwestern Ontario Neohelikian Osler Group: basalt, minor rhyolite and sedimentary rocks Intrusive rocks: gabbro plugs undersaturated plugs layered bodies northeast trending dykes Logan diabase sills Paleohelikian Sibley Group: red beds, stromatolite zone Apheb ian Animikie Group Rove Formation: shale Gunf lint FormatioB: iron formation
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 and 24: DEFORMATION OF THE SEINE CONGLOMERA
Page 25 and 26: -22- MINERAL POTENTIAL IN CREENSTON
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: —49— PROTEROZOIC ROCKS IN THE T
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 and 102: —93— (3) 'flow—layering' exhi
Page 103 and 104:
GOSSAN ZONE IN SULPHIDE BEARING GAB
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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