Pressure-temperature conditions of early Proterozoic metamorphism during the Trans-Hudson Orogen as determined from rocks straddling the Flin Flon-Kisseynew boundary at Niblock and File lakes, Manitoba

William Briggs; C. T Foster

doi:10.1139/e92-196

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Pressure-temperature conditions of early Proterozoic metamorphism during the Trans-Hudson Orogen as determined from rocks straddling the Flin Flon-Kisseynew boundary at Niblock and File lakes, Manitoba

Journal article

Peer reviewed

Pressure-temperature conditions of early Proterozoic metamorphism during the Trans-Hudson Orogen as determined from rocks straddling the Flin Flon-Kisseynew boundary at Niblock and File lakes, Manitoba

William Briggs and C. T Foster

Canadian journal of earth sciences, Vol.29(11), pp.2497-2507

11/1992

DOI: 10.1139/e92-196

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Abstract

The region contains pelitic schists metamorphosed to lower to middle almandine-amphibolite facies. Metamorphic conditions were studied by examining relative timing of growth of metamorphic minerals by geothermobarometry of selected samples. Calculated T and P are compared with those estimated from mineral assemblages and reactions on a petrogenetic grid. Two metamorphic and deformation phases have been recognized in the Niblock Lake and File Lake areas. The first metamorphism (contemporaneous with folding) was characterized by growth of micas but no higher grade minerals; T and P, therefore, were probably < approx 475 degrees C and 3.5 kbar. Peak conditions, reached during the second metamorphism resulted in growth of garnet, staurolite,sillimanite, and (in the Niblock Lake area) andalusite. In the Niblock Lake area, T ranged from 525 to 625 degrees C, with most samples between 550 and 600 degrees C; P ranged from 2.5 to 5 kbar, with most samples between 2.5 and 4 kbar. In the File Lake area, T ranged from approx 560 to 625 degrees C; P ranged from 3.3 to 4.6 kbar.

amphibolite facies

biotite

Canada

electron probe data

evolution

facies

feldspar group

File Lake

Flin Flon Manitoba

framework silicates

garnet group

geologic barometry

geologic thermometry

Hudsonian Orogeny

Igneous and metamorphic petrology

Kisseynew Complex

Manitoba

metamorphic rocks

metamorphism

metasedimentary rocks

metavolcanic rocks

mica group

nesosilicates

Niblock Lake

orogeny

orthosilicates

P-T conditions

Paleoproterozoic

petrology

plagioclase

plate convergence

Precambrian

Proterozoic

regional metamorphism

schists

sheet silicates

silicates

Structural geology

upper Precambrian

west-central Manitoba

Western Canada

Details

Title: Subtitle: Pressure-temperature conditions of early Proterozoic metamorphism during the Trans-Hudson Orogen as determined from rocks straddling the Flin Flon-Kisseynew boundary at Niblock and File lakes, Manitoba
Creators: William Briggs - University of Iowa
C. T Foster
Resource Type: Journal article
Publication Details: Canadian journal of earth sciences, Vol.29(11), pp.2497-2507
Publisher: National Research Council of Canada
DOI: 10.1139/e92-196
ISSN: 0008-4077
eISSN: 1480-3313
Language: English; French
Date published: 11/1992
Academic Unit: Earth and Environmental Sciences
Record Identifier: 9984229168502771

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