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La Ronge Lynn Lake Bridge Project: Geology of the Southern Reindeer Lake Area

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La Ronge Lynn Lake Bridge Project: Geology of the Southern Reindeer Lake Area Saskatchewan Open File Report 2003-1 Industry and Resources Saskatchewan Geological Survey _ La Ronge Lynn Lake Bridge Project: Geology of the Southern Reindeer Lake Area Executive Summary (part of CD1) R.O. Maxeiner, C.T. Harper, D. Corrigan, and D.G. MacDougall 2004 Saskatchewan Open File Report 2003-1 Industry and Resources Saskatchewan Geological Survey La Ronge–Lynn Lake Bridge Project: Geology of the Southern Reindeer Lake Area Executive Summary (part of CD1) R.O. Maxeiner, C.T. Harper, D. Corrigan, and D.G. MacDougall 2004 19 48 Printed under the authority of the Minister of Industry and Resources Although the Department of Industry and Resources has exercised all reasonable care in the compilation, interpretation, and production of this report, it is not possible to ensure total accuracy, and all persons who rely on the information contained herein do so at their own risk. The Department of Industry and Resources and the Government of Saskatchewan do not accept liability for any errors, omissions or inaccuracies that may be included in, or derived from, this report. Cover: Garnet-anthophyllite alteration assemblage from the Numabin Bay area (Reindeer Lake). This report is available for viewing and additional copies are available for purchase at: Publications Office Saskatchewan Industry and Resources 2101 Scarth Street, 3rd floor Regina, SK SA4P 3V7 (306) 787-2528 or FAX (306) 787-2488 E-mail: [email protected] and the Resident Geologists’ offices in La Ronge and Creighton Parts of this publication may be quoted if credit is given. It is recommended that reference to this report be made as follows: Maxeiner, R.O., Harper, C.T., Corrigan, D., and MacDougall, D.G. (2004): La Ronge–Lynn Lake Bridge Project: Geology of the southern Reindeer Lake area; Sask. Industry Resources, Open File Rep. 2003-1, 2 CD-ROM set. Reviewed and edited by: G.D. Delaney Prepared for publication by: C.L. Brown Manuscript received March 2003 Final revised manuscript received March 2004 Released September 2004 Saskatchewan Geological Survey Saskatchewan Geological Survey ii Open File Report 2003-1 Contents page Abstract ............................................................................................................................vi Introduction and Previous Work ....................................................................................... 1 Comments on Map Presentation........................................................................................ 3 Lithotectonic Assemblages of the Northwestern Reindeer Zone ...................................... 4 Levesque Bay Assemblage (prefix “L”)..................................................................... 4 Lawrence Point Assemblage (prefix “C”).................................................................. 4 Reed Lake Assemblage (prefix “C”).......................................................................... 4 Duck Lake Assemblage (prefix “D”) ......................................................................... 5 Milton Island Assemblage (prefix “W”) .................................................................... 5 Feldspathic Psammite to Psammopelite Succession (prefix “M”) ............................. 5 Intrusive Rocks........................................................................................................... 6 Deformation and Metamorphism in the La Ronge and Northwestern Kisseynew Domains .......................................................................................................... 7 Whole Rock Geochemistry................................................................................................ 8 Ultramafic-Mafic Volcanic Rocks.............................................................................. 8 Intermediate to Felsic Volcanic Rocks....................................................................... 8 Ultramafic Rocks........................................................................................................ 9 Intrusive Rocks........................................................................................................... 10 Plate Tectonic History ....................................................................................................... 12 Arc Stage and Previous History (1.88 Ga) ................................................................. 12 Sedimentary Basin Stage (1.87 Ga)............................................................................ 13 Collision and Accretion Stage (1.86 Ga).................................................................... 14 Back-arc Basin Stage (1.85 Ga) ................................................................................. 14 Successor Basin Stage (<1.84 Ga) ............................................................................. 14 Economic Geology ............................................................................................................ 16 Historical Aspects....................................................................................................... 16 New Data.................................................................................................................... 16 Base Metals ......................................................................................................... 16 Gold..................................................................................................................... 17 Platinum Group Elements ................................................................................... 17 Saskatchewan Geological Survey iii Open File Report 2003-1 Potential Deposit Types.............................................................................................. 17 References .........................................................................................................................19 Figures 1. Regional geological map with revised domain boundaries ........................................ 29 2. Simplified geology of the southern Reindeer Lake area ............................................ 30 3. Chronostratigraphic relationships in the northwestern Reindeer Zone and regional correlation................................................................................................................... 31 4. Banded amphibolite of the Levesque Bay Assemblage; Brenton Island area ............ 32 5. Leucotonalite cutting banded amphibolite of the Levesque Bay Assemblage; Brenton Island area..................................................................................................... 32 6. Harzburgitic rock of the Lawrence Point Assemblage; large crystals are partly serpentinized orthopyroxene and the brownish ‘groundmass’ is largely serpentinized olivine; ‘Duck’ Lake area......................................................... 32 7. Pillowed mafic volcanic rock of the Lawrence Point Assemblage; Stackhouse Bay area...................................................................................................................... 32 8. Dacitic tuff breccia of the Reed Lake Assemblage; Numabin Bay area..................... 32 9. Flow-banded rhyolite block in a dacitic tuff breccia of the Reed Lake Assemblage; Numabin Bay area................................................................................. 32 10. Migmatitic pelite of the Duck Lake Assemblage ....................................................... 33 11. Migmatitic psammopelite of the Milton Island Assemblage; Asimwok Bay area ..... 33 12. Cross-bedded feldspathic psammite of the McLennan Group; Macfarlane Island area .................................................................................................................. 33 13. Polymictic conglomerate of the McLennan Group; ‘Duck’ Lake area ...................... 33 14. Calcic feldspathic psammite of the McLennan Group; Laurie Lake area .................. 33 15. Aluminous feldspathic psammite of the Levesque Bay Assemblage cut by ultramafic dyke; Laurie Lake area.............................................................................. 33 16. Lithostructural history of the northwestern Reindeer Zone........................................ 34 17. Trace element geochemical classification diagram for mafic volcanic rocks of the southern Reindeer Lake area............................................................................ 35 18. Trace element geochemical classification diagram for mafic volcanic rocks of the southern Reindeer Lake area............................................................................ 35 19. N-MORB-normalized extended element diagram for mafic volcanic rocks of the Lawrence Point Assemblage ............................................................................ 35 20. N-MORB-normalized extended element diagram for mafic volcanic rocks of the Levesque Bay Assemblage............................................................................... 35 21. N-MORB-normalized extended element diagram for mafic volcanic rocks of the Reed Lake Assemblage .................................................................................... 36 22. Tectonic discrimination diagram for subalkaline basalts of the southern Reindeer Lake area after Pearce and Cann (1973) ..................................................... 36 Saskatchewan Geological Survey iv Open File Report 2003-1 23. Tectonic discrimination diagram for subalkaline basalts of the southern Reindeer Lake area after Wood (1980) .....................................................................
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