TY - JOUR
T1 - Heat production and thermal conductivity of rocks from the Pikwitonei-Sachigo continental cross section, central Manitoba
T2 - implications for the thermal structure of Archean crust.
AU - Fountain, D. M.
AU - Salisbury, M. H.
AU - Furlong, K. P.
PY - 1987
Y1 - 1987
N2 - 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.
AB - 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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U2 - 10.1139/e87-154
DO - 10.1139/e87-154
M3 - Article
AN - SCOPUS:0023476856
SN - 0008-4077
VL - 24
SP - 1583
EP - 1594
JO - Canadian Journal of Earth Sciences
JF - Canadian Journal of Earth Sciences
IS - 8
ER -