2019 Annual Meeting
Terrace Bay, ON
May 8 & 9, 2019

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Field trips

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A full slate of pre- and post-meeting, one-day field trips is being planned to highlight the Precambrian geology of Lake Superior’s north shore. All involve hikes of moderate difficulty. Please be advised that trips 1 and 5 involve boat travel on Lake Superior and are dependent on lake and weather conditions.
Pre-Meeting trips - May 7th
1. Slate Islands*

The Slate Islands, just offshore from Terrace Bay, represent what has been called the “best-preserved, medium-sized meteor impact structure on Earth.” Shatter cones, breccias and other impact-related features in a variety of Archean and Proterozoic rocks will be highlighted. Space is limited by boat size and availability

2. Midcontinent Rift-Related Carbonatites and Diatremes

The Mesoproterozoic, Midcontinent Rift-related Prairie Lake Carbonatite (sovite, ijolite) and associated Dead Horse Creek and McKellar Creek diatreme complexes occur immediately west of the Coldwell alkalic complex. They contain a variety of niobium, tantalum, beryllium, zirconium, uranium, thorium and phosphate-mineralized zones.

3. Schreiber Greenstone Belt

This well-preserved, Neoarchean greenstone belt comprises a variety of komatiitic, mafic to felsic metavolcanic and sedimentary rocks. Granitoid and porphyritic rocks intrude the supracrustal assemblages. Recent and ongoing bedrock mapping and research conducted by the Ontario Geological Survey will be highlighted.

4. Nipigon Area

The Nipigon area, west of Terrace Bay, hosts Neoarchean, amphibolite-facies metamorphic and intrusive rocks of the Quetico subprovince, as well as overlying Mesoproterozoic Sibley Group sedimentary rocks and Midcontinent Rift-related mafic intrusive rocks. Field trip stops will include both the Archean basement rocks and overlying Proterozoic sedimentary and intrusive rocks.

Post-meeting trips - May 10th
5. Rossport Transect*

The offshore islands in Lake Superior near Rossport provide a 6 km transect from Archean basement through to the Mesoproterozoic. This trip will include Neoarchean granitoids; Paleoproterozoic Animikie Group sedimentary rocks; Mesoproterozoic Sibley Group sedimentary rocks and Midcontinent Rift-related Osler Group volcanic rocks. Space is limited by boat size and availability.

6. Coldwell Alkalic Complex

The Midcontinent Rift-related Coldwell Complex, the largest alkalic complex in North America, consists of a variety of gabbroic and syenitic rocks which host copper-nickel-PGE deposits and rare metal occurrences, respectively. A highway transect and shoreline exposures will highlight well-preserved igneous textures, intrusive relationships and lithologic complexity.

7. Building Stones of the Marathon Area

Syenites of the Coldwell Alkalic Complex near Marathon were quarried in the late 1880’s during construction of the Canadian Pacific Railway and again in the early 20th century for dimension stone. Visits to two abandoned quarries and recent test sites are planned.

8. Winston Lake Mine Area

The past-producing Winston Lake Mine comprised the high-grade Winston Lake and Pick Lake volcanogenic massive sulphide (VMS) zinc-copper orebodies. This trip will feature VMS-related, hydrothermally altered footwall Neoarchean metavolcanic rocks and current exploration activity on the property.

(*Please note that this trip is dependent on weather and lake conditions.)

 

 

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