Program, Abstracts, and Guidebooks - University of Minnesota Duluth

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—96— exhibit both gradational and sharp contact relations to an overlying "syenodiorite" phase of netavolcanic cap rock. Because of the gradational relations the syenites were included with the syenodiorites on the revised map. Thin sections show phenocrysts of alkali feldspar (unexsolved) in a fine—grained groundmass of alkali feldspar (highly exsolved) ophitically enclosed by barkevikite. Relict clinopyroxene (variety augite — sodic augite) has been observed. Hematite staining of feldspars is generally extensive. This mineral assemblage is not much different from the 'darker' varieties of porphyritic laurvikite and likewise this rock type appears to represent a 'high' level variety. 8.6 STOP 5 NEPHELINE SYENITE (Pig. 1, 5 & 6). 16.8 This outcrop (Fig. 5) is typical of nepheline syenites where in contact with 'diabasic' lava. The gross zonation within the feldspathoidal body is generally parallel to the contact with the 'diabase'. The diabase is variably nephelinized. One can conclude that, STOP 6 LAURVIKITE (Fig. 1) 18.4 (1) there were at least two periods of dilation and emplacement (Fig. 61); (2) emplacement of feldspathoidal magma was controlled by jointing within the 'diabase' (see Figs. 6a, 6b, 6c); (3) emplacements along the more vertical joints preceded those along flats lying joints (Fig. 6c); (4) where present, the later feldspathoidal intrusions show nepheline pseudomorphed by the zeolite natrolite (with associated thomsonite) which is orange in colour. 'Red' contact variety of laurvikite highly charged with inclusions of nearby 'diabase'. STOP 7 PEGMATITE (Fig. I & 7). Traverse along a composite, nepheline (zeolitized) pegmatite emplaced into gabbros (Fig. 7).
—97— Fig. 6c Fig. 6b ;' TRAIL TO . a GORDIE LAKE a 0 S a \ 0 .-T-_ IS — a a C 0 - : : ' . 0 • -: o 0 0 0 0 0 a LEGEND ZEOLI TIZE D FELDSPATHOIDAL SYEN1TE FEMAGS. INCLUDE BIOTITE + BARKEVIKITE 0 a 0 C C, o S 0 0 AVENITE WITH 8IOTITE + BARKEVIKITE 0 C TUN NEL BARKEVIKITE — NEPHELINE SYENITE 8 LII VARIABLY NEPHELINIZED DIABASIC LAVA (Pp NONOMARKITE SUCKER a 0 COVE LINE AIdE NTS NUMEROUS INCLUSIONS OF OIABASIC" LAVA U) Fig. 5 Nepheline syenite — "Diabase" contacts. 1/4 I/B 0 /4 MiLE SCALE Stop 5
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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
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—49— PROTEROZOIC ROCKS IN THE T
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—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 and 102: —93— (3) 'flow—layering' exhi
Page 103 and 104: GOSSAN ZONE IN SULPHIDE BEARING GAB
Page 105: —95— (3) feldspars variably fol
Page 109 and 110: Pig. 7 West contact of CROSS SECTIO
Page 111: PRINCE AR THUR HOTEL ® 0 ® SHOREL
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