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Copyright: Canadian and international intellectual property laws protect the Content. Unless otherwise indicated, copyright is held by the Queen’s Printer for Ontario. It is recommended that reference to the Content be made in the following form: Grunsky, E.C. 1987. Geological series, Precambrian geology, Batchawana synoptic project, Batchawana- Searchmont sheet, District of Algoma; Ontario Geological Survey, Preliminary Map P.3063, scale 1:50 000. Use and Reproduction of Content: The Content may be used and reproduced only in accordance with applicable intellectual property laws. Non-commercial use of unsubstantial excerpts of the Content is permitted provided that appropriate credit is given and Crown copyright is acknowledged. Any substantial reproduction of the Content or any commercial use of all or part of the Content is prohibited without the prior written permission of ENDM. 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Contact: FOR FURTHER PLEASE CONTACT: BY TELEPHONE: BY E-MAIL: INFORMATION ON The Reproduction of ENDM Publication Local: (705) 670-5691 the EIP or Content Services Toll-Free: 1-888-415-9845, ext. 5691 [email protected] (inside Canada, United States) The Purchase of ENDM Publication Local: (705) 670-5691 ENDM Publications Sales Toll-Free: 1-888-415-9845, ext. 5691 [email protected] (inside Canada, United States) Crown Copyright Queen’s Printer Local: (416) 326-2678 Toll-Free: 1-800-668-9938 [email protected] (inside Canada, United States) MARGINAL NOTES morphic rank of the supracrustal rocks (metasediments and mafic volcanic rocks) is upper amphibolite accompanied by partial melt­ ing and recrystallization with the development of coarse-grained Location and Access quartz and lit-par-lit neosome This rank of metamorphism accom­ panied by anatexis is found only in the northwestern part of the The Batchawana Synoptic Project map area is located in the supracrustal belt. This may be due to the higher water content Districts of Algoma and Sudbury, and is bounded by Latitudes within the metasediments which would allow for more extensive 46°56' to 47°30' and Longitudes 83°30' to 84°50'. The approxi­ fluid migration for recrystallization. mate area of 5000 Km2 covers 81 townships and 8 unsurveyed Mines and Minerals Division areas. Access to the region is available by allweather roads, Ontario Geological Survey logging roads, and the Algoma Central Railway line; numerous Structural Geology rivers and lakes also provide access by boat and float-equipped MAP P.3063 aircraft A hydro-electric powerline and accompanying access The supracrustal rocks of the Batchawana belt can be divided into road passes from the Mississagi River hydro-electric dam system two tectonic domains which are distinctly defined by their fabric Geological Series-Preliminary Map through Handleman. Ewen, Butcher, Sherratt, Scriven, Moggy, and deformational structures. The earliest structural fabric is a Moen, Hammond, Hallett. and Emiry Townships. northeast-trending schistosity which occurs parallel to the north­ A three-stage hydro-electric power dam system is located at east trend of the first volcanic cycle. Occuring primarily in the the western end of the Montreal River reservoir. Power generating metavolcanics of Palmer, Wishart. Olsen, and Davieaux Town­ dams are located in Home, Peever, and Rix Townships. Several ships, The schistosify follows a regular trend, except where it PRECAMBRIAN GEOLOGY power lines extend southward from these generating stations in follows the margin of the Griffin Lake Slock in Norberg Township. the western part of the region. Access into the central part of the In the northeastern part of Davieaux Township, the schistosity map area is by the Algoma Central Railway line which operates becomes predominantly northwestern trending. The trend changes Batchawana Synoptic Project both freight and passenger service with scheduled stops within abruptly and is marked by several faults and shear zones. The the area. Float-equipped aircraft service is available in the Village central sedimentary basin in Vibert, Tronsen, Raaflaub, and Run­ of Batchawana Bay and in the city of Sault Ste. Marie. Helicopter nalls Townships displays irregular bedding and schistosity fabrics. Batchewana-Searchmont Sheet service can be obtained from Sault Ste. Marie and Sudbury. Three This is due to the local deformation caused by the intrusion of the District of Algoma hard-surfaced all-weather roads provide access into the map area. Mongoose Lake and Grey Owl Lake Stocks. The sedimentary basin Highway 17 extends northward from Sault Ste. Marie along the is bounded by a major east-trending fault In Olsen and Davieaux Figure 2: AFM and Al-Fe + Ti-Mg diagram- displaying the Scale 1:50 000 eastern shore of Lake Superior. Highway 129 is located just east Townships and is non-comformable with the tholeiitic rocks of the dominat tholeiitic trend of the western volcanic domain of the map area and provides access to the eastern part of the first cycle. The sedimentary basin conformably overlies the sec­ map area. Highways 556 and 531 provide access to Searchmont ond cycle of calc-alkalic and tholeiitic volcanism, as shown by and the southern and eastern parts of the map area respectively. transitional facies sequences in Way-White and Runnalls Town­ Gravel haulage roads, extending eastward from Highway 17, are ships. located along the Harmony River, the Batchawana River in Kincaid A major northwest-trending, eastward-dipping synclinal axis NTS References: 41 K/16; 41 N/1 Township, and along the Montreal River. The road along the extends from the northwest comer of Lunkie Township to Runnalls Montreal River is a private access road and permission to use it Township and marks the zone of juxtaposition of the later calc- ODM-GSC Aeromagnetic Maps: 2201G, 2202G must be obtained from the Great Lakes Power Company in Sault alkalic volcanic cycle with the tholeiitic volcanic rocks of the first OGS Compilation Map: 2419 Ste. Marie. Access into Olsen and Davieaux Townships is made along log haulage roads from the main Harmony River haulage cycle. This northwesterly trend is the dominant schistosity of the road. Palmer Township can be accessed from a road north of southeastern part of the belt. The second cycle of volcanic rocks are overturned and possibly thrust over the earlier tholeiitic vol­ Batchawana Bay The road access along the Batchawana River is canic rocks. This appears to be the case in the Desbiens-Lunkie © Queen's Printer for Ontario. 1987 poor, particularly east of the Tribag Mine site; however, all-terrain Printed in Ontario, Canada cycles can negotiate the old unmaintained haulage roads with Townships area where a northeast-dipping syncline is overturned little difficulty. The Batchawana River Road extends north of Wart and intersects major east-trending faults in Davieaux Township Parts of this publication may be quoted if credit is Lake into Runnalls Township. An alternative maintained forest The axial plane of the overturned syncline was reactivated as a given and the material is properly referenced. access road, extending as far as the Tribag Mines site, branches thrust zone between the early first cycle tholeiitic volcanism and the second cycle. off at "Mile 67" on Highway 17 in Kincaid Township Roads into This map is published with the permission of V.G Lake Superior Provincial Park are restricted and permission must The northwesterly trending syncline merges with a northeast­ Milne. Director Ontario Geological Survey. be obtained from the park administration for vehicle access. erly trending syncline In Runnalls Township and provides evidence that these two volcanic domains are part of the same sequence.