Abstract
New heat flow determinations in Brittany (Western France) allow mapping with a good coverage (1 point per 1000 km 2) over that region. A high heat flow zone, oblique to the present geological structures, trends from northern Central Brittany to the south, and then turns to the ESE towards the Massif Central. Heat production ( A) and heat flow ( Q) are tested against a linear relationship. The data do not fit a strict linear relationship, but the points are distributed within an elongated cluster in which a linear regression can be approximated, yielding the following equation: Q = 26.6(±3.5) mW/m 2 + 15.6(± 0.6) km × A. Several tests of significance corroborate the linear cluster and do not alter the computed parameters. The mapping of the residual values shows a geographical distribution which can be correlated with filtered gravimetric and magnetic data. Those residuals reflect local variations in heat production distribution or in the heat transport mechanism. The high value of the slope (15.6 km) computed during the linear regression reflects the influence of the upper to middle crust. This value is too elevated to represent the thickness of the granitic intrusions, which are known to be shallow rooted (4–6 km) from gravity data interpretation. Compared to adjacent Hercynian countries, the data lie within the range of those of central and southwestern England.
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