Heat production and thermal conductivity of rocks from the Pikwitonei-Sachigo continental cross section, central Manitoba: implications for the thermal structure of Archean crust.

D. M. Fountain, M. H. Salisbury, Kevin Patrick Furlong

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70 Citations (Scopus)

Abstract

The Pikwitonei and Sachigo subprovinces of central Manitoba provide a cross-sectional view of the Superior province crust. In cross section, the upper to mid-level crust is composed of synformal greenstone belts surrounded by tonalitic gneisses, both of which are intruded by granitic plutons. This crustal structure persists downwards into the granulite facies, where keels of the greenstone belts can be found. To constrain models of the crust, heat production and thermal conductivity in 60 rocks from this terrain were measured using standard gamma -ray spectrometry and divided bar techniques. Large vertical and lateral heterogeneities in heat production in the upper crust are evident; heat production is high in granites and metasedimentary rocks, intermediate in tonalite gneisses, and low in the portions of greenstone belts dominated by mafic meta-igneous rocks. -J.M.H.

Original languageEnglish (US)
Pages (from-to)1583-1594
Number of pages12
JournalCanadian Journal of Earth Sciences
Volume24
Issue number8
DOIs
StatePublished - Jan 1 1987

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heat production
greenstone belt
thermal structure
thermal conductivity
Archean
cross section
crust
rock
gamma ray spectrometry
tonalite
metasedimentary rock
granulite facies
crustal structure
upper crust
igneous rock
pluton

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

Cite this

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abstract = "The Pikwitonei and Sachigo subprovinces of central Manitoba provide a cross-sectional view of the Superior province crust. In cross section, the upper to mid-level crust is composed of synformal greenstone belts surrounded by tonalitic gneisses, both of which are intruded by granitic plutons. This crustal structure persists downwards into the granulite facies, where keels of the greenstone belts can be found. To constrain models of the crust, heat production and thermal conductivity in 60 rocks from this terrain were measured using standard gamma -ray spectrometry and divided bar techniques. Large vertical and lateral heterogeneities in heat production in the upper crust are evident; heat production is high in granites and metasedimentary rocks, intermediate in tonalite gneisses, and low in the portions of greenstone belts dominated by mafic meta-igneous rocks. -J.M.H.",
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AU - Furlong, Kevin Patrick

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