Évaluation de la météorisation du granite en milieu tempéré océanisé à partir de monuments historiques en Bretagne méridionale. (Granite weathering assessment in temperate oceanic environment according to historical monuments in Southern Brittany)

摘要

Granite blocks used as building materials display microforms on their exposed face which are the result of the elementary stages of erosion. Almost 500 microforms have been mesured on 36 religious monuments in Southern Brittany, mainly built during the XVth and XVIth centuries, in a granitic environment (Pays Bigouden, Carnac and Batz-sur-Mer). Weathering rates reached 5 to 25 mm in 500 years, but are irregular in time as well as in space, depending on several factors : lithology, height, aspect, distance from the sea, biologic colonization, and human factors.