Geoscience

Geological Survey Activity Tracker

Northern Manitoba

 

Geology, lithogeochemistry and metallogeny of the Lynn Lake greenstone belt, northwestern Manitoba

 

Click image to enlargeProject Information

Principal investigators:
X.M. (Eric) Yang, Chris Beaumont-Smith

Partnered with:
Chris Lawley, Geological Survey of Canada; David R. Lentz, University of New Brunswick; Alamos Gold Inc.

Location:
NTS 64C10 to 64C16

 

Project Description

Main objectives:

This project is to update 1:50 000 geological maps of the Lynn Lake greenstone belt, to investigate its geological and geodynamic evolution, and to study metallogeny and key factors controlling formation of various types of mineral deposits (e.g. gold, VMS, nickel-copper-PGE) via bedrock mapping, lithogeochemical characterization, radiogenic isotopes, and GIS analysis.

Methodology:

Methods include geological mapping, petrographic analysis, mineral chemistry, lithogeochemistry, Nd isotopes, geochronology (U-Pb TIMS), GIS compilation and analysis. The magmatic nature of supracrustal mafic to felsic metavolcanic assemblages as well as mafic intrusive suites can be constrained by chemical composition of spinel group minerals in conjunction with lithogeochemical and radiogenic isotopic characterization. Field relationships supported by U-Pb geochronology provide key constraints on temporal evolution of the volcanic assemblages and mafic intrusions, which are used together with the information from mineral chemistry and lithogeochemistry to investigate their tectonic setting(s), petrogenesis and metallogeny. Petrogenetic types of granitoids can be constrained by field relations, magnetic susceptibility, mineral assemblages, mineral chemistry, and geochemical compositions. Geochemical processes of granitoid magmas and their sources will be investigated by using lithogeochemistry and Nd isotopes supported by precise U-Pb zircon age determination. Geodynamic settings, evolution and related mineralization are investigated by multidisciplinary approaches using all available geoscientific data.

 

Benefits:

The project provides insights into geodynamic evolution and metallogeny of the Lynn Lake belt, and into fundamental factors controlling diverse ore-forming systems and geological expressions used for exploration targeting. A set of updated maps and related geoscientific dataset will improve understanding tectonic settings, geological evolution, and metallogeny of the belt.

 

Plans for fiscal year 2017-2018:

  • Undertake field work between June 19 and August 13
  • Report of Activities and poster session, November
  • Process and tabulate chemical analyses, and produce various element plots, December/January
  • U-Pb (TIMS) and LA-ICPMS dating in winter
  • Petrography of polished thin sections
  • Schematic study of gold metallogeny

 

Completed outputs:

2016-2017

Yang, X.M. and Beaumont-Smith, C.J. 2016: Geological investigations in the Farley Lake area, Lynn Lake greenstone belt, northwestern Manitoba (part of NTS 64C16); in Report of Activities 2016, Manitoba Growth, Enterprise and Trade, Manitoba Geological Survey, p. 99–114.

Yang, X.M. and Beaumont-Smith, C.J. 2016: Bedrock geology of the Farley Lake area, Lynn Lake greenstone belt, northwestern Manitoba (part of NTS 64C16); Manitoba Growth, Enterprise and Trade, Manitoba Geological Survey, Preliminary Map PMAP2016-5, scale 1:20 000.

Yang, X.M. and Beaumont-Smith, C.J. 2016: Preliminary results of bedrock mapping in the paleoproterozoic Lynn Lake greenstone belt, northwestern Manitoba: new insights into the banded iron formation-hosted Farley Lake gold deposit; Manitoba Growth, Enterprise and Trade, Manitoba Geological Survey, Manitoba Mining and Minerals Convention 2016, Winnipeg, Manitoba, November 16–18, 2016, program with abstracts, p. 44.

2015-2016

Yang, X.M. and Beaumont-Smith, C.J. 2015: Bedrock geology of the Keewatin River area, Lynn Lake greenstone belt, northwestern Manitoba (parts of NTS 64C14, 15); Manitoba Mineral Resources, Manitoba Geological Survey, Preliminary Map PMAP2015-3, scale 1:20 000.

Yang, X.M. and Beaumont-Smith, C.J. 2015: Geological investigations of the Keewatin River area, Lynn Lake greenstone belt, northwestern Manitoba (parts of NTS 64C14, 15); in Report of Activities 2015, Manitoba Mineral Resources, Manitoba Geological Survey, p. 52–67.

Yang, X.M. and Beaumont-Smith, C.J. 2015: Granitoid rocks in the Lynn Lake region, northwestern Manitoba: preliminary results of reconnaissance mapping and sampling; in Report of Activities 2015, Manitoba Mineral Resources, Manitoba Geological Survey, p. 68–78.

Yang, X.M. and Beaumont-Smith, C.J. 2015: Petrogenetic types, tectonic settings, and mineral potential of granitoids in the Lynn Lake region, northwestern Manitoba: evidence from reconnaissance mapping, geological sampling and lithogeochemistry; Manitoba Mineral Resources, Manitoba Geological Survey, Manitoba Mining and Minerals Convention 2015, Winnipeg, Manitoba, November 18–20, 2015, poster presentation.

Yang, X.M. and Beaumont-Smith, C.J. 2015: Preliminary results of bedrock mapping in the Keewatin River area, the Lynn Lake greenstone belt, northwestern Manitoba; Manitoba Mineral Resources, Manitoba Geological Survey, Manitoba Mining and Minerals Convention 2015, Winnipeg, Manitoba, November 18–20, 2015, oral presentation.

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