Regional Geology, Sioux Lookout Orogenic Belt - Geology Ontario

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Southwest Echo Township ............................................................ 19 Central Volcanic Belt: Northeast Bay of Minnitaki Lake Area .................................... 19 Eastern Predominantly Basaltic Units .................................................... 20 Western Predominantly Andesitic Pyroclastic Units ........................................ 20 Stratification .................................................................... 20 Primary Fragmental Fabrics ........................................................ 20 Clast Composition ............................................................... 21 Clast Shape ..................................................................... 21 Clast Size ...................................................................... 21 Grading ........................................................................ 21 Sedimentary Structures ........................................................... 22 Lava Flow Breccia Facies: Subaerial Deposits ......................................... 23 Dikes .......................................................................... 23 Alteration Fabric ................................................................ 24 Sedimentary Facies: Subaerial (Fluvial) Reworking ..................................... 24 Sedimentary Facies: Subaqueous Deposits ............................................ 24 Mafic to Intermediate Flow Facies: Subaqueous Deposits ................................ 24 Other Lithologies ................................................................ 25 Interpretation of Paleoenvironments and Stratigraphic Trends ................................ 25 Central Volcanic Belt: Northeast Bay Pluton (Dioritic Complex), Northeast Bay of Minnitaki Lake Area ................................................................. 26 Lithologies ......................................................................... 27 Heavily Diked Zone (Potential Pluton--margin Dike Swarm) ................................. 27 Central Volcanic Belt: Central Minnitaki Lake Area ........................................... 28 Lithofacies ......................................................................... 28 Burnthut Island .................................................................. 28 Central Volcanic Belt: Pickerel Arm of Minnitaki Lake Area .................................... 29 Highway 72 Roadside Outcrop: Alteration and Exhalite Sequence ............................. 29 Franciscan Creek Area BIF Unit ........................................................ 29 Pickerel Arm Area Pyroclastic Rocks .................................................... 29 Age and Uncertain Stratigraphic Context ............................................. 30 Pickerel Arm Area Porphyry Bodies ..................................................... 30 Interpreted Stratigraphic Context .................................................... 30 Stratigraphic Interpretation ............................................................ 30 Minnitaki Group ........................................................................ 31 Lithofacies ......................................................................... 31 Thinly Bedded Facies ............................................................. 31 Thickly Bedded Facies ............................................................ 32 Finer (Distal) Conglomeratic Facies ................................................. 32 Pickerel Arm Area Wackes and Lapilli--tuff ........................................... 32 Central Minnitaki Lake Area ....................................................... 33 Southeast Area Lithofacies: Southeast and Twin Bays of Minnitaki Lake ....................... 33 Interpretation ....................................................................... 34 Stratigraphic Aspects ................................................................. 34 The “Mud Problem” .............................................................. 35 Southern Volcanic Belt ................................................................... 35 Volcanic Fragmental Lithofacies ....................................................... 36 Interpretation ....................................................................... 36 Other Lithological Units .................................................................. 37 Granitoid Intrusions .................................................................. 37 Northeast Intrusive Complex .......................................................... 37 Winnipeg River Subprovince Gneiss .................................................... 37 Structural Geology .......................................................................... 38 Small--Scale Structures ................................................................... 38 vii
Page 1: Ontario Geological Survey Open File
Page 5: e Queen’s Printer for Ontario, 20
Page 13: Early Stage Orogenic Belt Developme
Page 17: Abstract The Sioux Lookout orogenic
Page 21 and 22: Introduction The Sioux Lookout orog
Page 23 and 24: A large number of assessment file r
Page 25 and 26: The term “Neepawa Group” is mis
Page 27 and 28: Northern Volcanic belt from central
Page 29 and 30: amount of interbedded BIF units in
Page 31 and 32: limited by poor quality exposures,
Page 33 and 34: with small intermediate--felsic vol
Page 35 and 36: Interpretation The conglomeratic as
Page 37 and 38: separated by faulting into the two
Page 39 and 40: Miles Lake At the west end of Miles
Page 41 and 42: (plagioclase--phyric clasts are ver
Page 43 and 44: Part of this outcrop (about 1 m of
Page 45 and 46: Pillows are locally abundant and fo
Page 47 and 48: geochemical data (see “Geochemist
Page 49 and 50: CENTRAL VOLCANIC BELT: PICKEREL ARM
Page 51 and 52: BIF units, sub--exhalite alteration
Page 53 and 54: One outcrop contains important exam
Page 55 and 56: Most of the apparent paleocurrents
Page 57 and 58:
change) from eastern pyroclastic fa
Page 59 and 60:
Quartz veins with low to flat dips
Page 61 and 62:
Observations made during the presen
Page 63 and 64:
REE characteristics of the Patara F
Page 65 and 66:
6a--c and Figures 12a,c) are common
Page 67 and 68:
STAGES 0, 1 The hypothesis that the
Page 69 and 70:
subduction zone was likely to have
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structures, see: Christie--Blick an
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Laramide--type uplift, south--verge
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and contrast sharply with structura
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southeast--striking schistosity alo
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thrusting may be difficult or impos
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Lookout orogenic belt. This would c
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1988) interpreted the basal unit of
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In contrast, the ca. 2719-2713 Ma a
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interpretations of an appropriately
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The predominantly basaltic Stages 1
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Devaney 1997, 1999a) and other part
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strata (flat to 30 o dip southeast)
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misleading because it normally sugg
Page 97 and 98:
Blackburn, C.E., Hinz, P., Storey,
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Devaney, J.R. 1997. Stratigraphy an
Page 101 and 102:
Groves, D.I. and Foster, R.P. 1991.
Page 103 and 104:
Larbi, Y., Stevenson, R., Breaks, F
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Pearce, J.A. and Peate, D.W. 1995.
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Steidtmann, J.R. and Schmitt, J.G.
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89 Figure 1a. Location and general
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91 Figure 2. Sioux Lookout orogenic
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Figure 4. Stratovolcanic transgress
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Figure 5b. Geochemical sample locat
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Figure 7. Plots of selected high fi
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Figure 8. Continued 99
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Figure 9. Continued 101
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Figure 11. Chondrite--normalized ra
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Figure 11. Continued. m) Northeast
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Figure 12. Continued. g) dioritic r
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Figure 13. Rb versus Y+Nb discrimin
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Figure 14. Continued. 111
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Figure 16. Th/Nb versus Nb/Y discri
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Figure 18. Adakite classification d
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Figure 20. Extended trace element p
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Figure 22a. Cross--sectional cartoo
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Figure 23. Semi--schematic map of t
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Figure 25. Stage 5 sedimentation an
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Figure 27. Cartoon scenario for dra
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Figure 29. Sinistral--sense positiv
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Figure 31. Stage 6 sedimentation an
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Figure 33. The proposed lineament p
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Table 1. Major and selected trace e
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Table 1. Continued Sample 94JRD--00
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Table 1. Continued. Sample 94JRD--0
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Table 1. Continued. Sample 94JRD--0
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Table 1. Continued. Sample 94JRD--B
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Table 1. Continued. Sample 95JRD--B
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Table 2. Classification of unaltere
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Table 3. Average major oxide compos
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Table 7. Summary of discrimination
Page 174:
ISSN 0826--9580 ISBN 0--7778--9540-
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Regional Geology, Sioux Lookout Orogenic Belt - Geology Ontario

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