Crustal heat production in the Superior Province, Canadian Shield, and in North America inferred from heat flow data - Archive ouverte HAL Access content directly
Journal Articles Journal of Geophysical Research. Oceans Year : 2006

Crustal heat production in the Superior Province, Canadian Shield, and in North America inferred from heat flow data

(1) , (1) , (2) , (1)
1
2

Abstract

[1] Measurements of heat flow and U, Th, K concentrations are used to determine the amount of heat generated in various belts of the Superior Province, the largest Archean craton on Earth. These data allow estimates of the average crustal heat production and indicate compositional differences between upper and lower crustal assemblages. The bulk average heat production of the Superior Province crust is 0.64 mW m À3 and is almost the same in different belts of slightly different ages, illustrating the remarkable uniformity of crust-building mechanisms. In the wider context of the North American continent, the bulk crustal heat production decreases from 1.0 mW m À3 in the oldest Slave Province to a minimum of 0.55 mW m À3 in the Paleo-Proterozoic Trans-Hudson Orogen. It increases in younger provinces, culminating with a high value of 1.05 mW m À3 in the Phanerozoic Appalachian Province. In all provinces, U and Th enrichment is systematically associated with sedimentary accumulations. A crustal differentiation index is obtained by calculating the ratio between the average values of heat production at the surface and in the bulk crust. The differentiation index is correlated with the bulk average heat production, which suggests that crustal differentiation processes are largely driven by internal radiogenic heat.
Fichier principal
Vignette du fichier
JGR-2006-perry and jaupart.pdf (739.63 Ko) Télécharger le fichier
Origin : Publisher files allowed on an open archive
Loading...

Dates and versions

insu-01267703 , version 1 (08-03-2016)

Identifiers

Cite

H.K.C. Perry, C Jaupart, J.-C Mareschal, G Bienfait. Crustal heat production in the Superior Province, Canadian Shield, and in North America inferred from heat flow data. Journal of Geophysical Research. Oceans, 2006, ⟨10.1029/2005JB003893⟩. ⟨insu-01267703⟩
68 View
110 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More