Regional Geology, Sioux Lookout Orogenic Belt - Geology Ontario

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Early Stage Orogenic Belt Development: a Fold--and--Thrust Belt (Sioux Lookout Orogenic Belt Stage 5) Adjacent to a Broken Foreland .............................................. 70 Late Stage Orogenic Belt Development (Sioux Lookout Orogenic Belt Stage 6): Emphasis on Strike--Slip Faulting ....................................................... 72 Synorogenic Granitic Intrusions ............................................................ 74 Cratonization and Postorogenic Events ...................................................... 74 “Terrane” Terminology ................................................................... 74 References ................................................................................ 76 Metric Conversion Table ..................................................................... 151 FIGURES 1. Location and general geology of the Sioux Lookout area. ..................................... 89 2. Sioux Lookout orogenic belt north–south transect. ........................................... 91 3. Roadside cross--section of the Patara Formation and adjacent Northern Volcanic Belt. . ............. 92 4. Stratovolcanic transgression--regression cycle model. ........................................ 93 5. Geochemical sample location map. . ...................................................... 94 6. Discrimination plots showing inferred plate tectonic affinity of Sioux Lookout orogenic belt basalts. .. 96 7. Plots of selected high field strength elements versus SiO 2 for all Sioux Lookout orogenic belt volcanic rock samples. ................................................................ 97 8. Plots of selected high field strength elements and a ratio (Zr/Y) versus SiO 2 (versus Y in e) for all Sioux Lookout orogenic belt samples. . .............................................. 98 9. Plots of selected oxides and elements versus SiO 2 for Sioux Lookout orogenic belt basalts, showing subdivision into two sample groups. .............................................. 100 10. Plots of selected trace element ratios versus TiO 2 for selected Central Volcanic belt intermediate--felsic volcanic rocks, showing three distinct sample groups. ........................ 102 11. Chondrite--normalized rare earth element (REE) plots for samples of Sioux Lookout orogenic belt lithologies and stratigraphic units. ........................................................ 103 12. N--MORB normalized extended trace element plots (“spidergrams”) for samples of Sioux Lookout orogenic belt lithologies and stratigraphic units. ............................................. 106 13. Rb versus Y+Nb discrimination diagram. .................................................. 109 14. For all Sioux Lookout orogenic belt samples, plots of Mg# versus: SiO 2 ;K 2 O; La/Sm. ............. 110 15. Zr/Yb versus Nb/Yb discrimination diagram (after Pearce and Peate 1995, Figure 2) for Sioux Lookout orogenic belt basalts. .......................................................... 112 16. Th/Nb versus Nb/Y discrimination diagram. ................................................ 113 17. Discrimination diagrams (after Saunders and Tarney 1991, Figures 10.13, 10.15, 10.16) for Sioux Lookout orogenic belt basalts: Ba versus Zr; Ce/Zr versus Ba/Zr; Ce/Nb versus Th/Nb. . ............ 114 18. Adakite classification diagrams (after Drummond et al. 1996, Figures 2, 3, 5, 6, 8) for selected Sioux Lookout orogenic belt volcanic and volcaniclastic rocks. ................................ 115 19. REE plots for representative samples of interpreted Stages 1 to 4. .............................. 116 20. Extended trace element plots for representative samples of interpreted Stages 1 to 4. ............... 117 21. Plot of N--MORB normalized Th/Nb (a subduction signature) versus chondrite--normalized La/Yb (a fractionation measure) for all Sioux Lookout orogenic belt samples. ..................... 118 22. Cross--sectional cartoon views of the interpreted evolutionary stages of the Sioux Lookout orogenic (“greenstone”) belt. ................................................................... 119 23. Semi--schematic map of the Sioux Lookout orogenic belt. .................................... 121 24. Schematic cross--sections of the Sioux Lookout orogenic belt. ................................. 122 xi
Page 1: Ontario Geological Survey Open File
Page 5: e Queen’s Printer for Ontario, 20
Page 11: Large--Scale Structures ...........
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
Page 89 and 90:
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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