CGRG Bibliography of Canadian Geomorphology
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Author : Ek, C. and Hillaire-Marcel, C. and Trudel, B.
Date : 1981.
Title : Sedimantologie et paleoclimatologie isotopique dan un grotte de Gaspesie, Quebec
Publication : Geographie physique et Quaternaire
Issue : 35(3):
Page(s) : 317-328.
Abstract
The object of the study is a cave known as Speos de la Fee", at La Rédemption. Developed by flowing water in Silurian limestones to the west of Lac Matapedia, its present morphology is influenced by collapse features near the two entrances. In the principal passage-a dip tube- water-lain silt and fine sand deposits are overlain by a diamicton containing clasts of various lithological composition, and amongst them striated limestone pebbles. The isotopic composition of the carbonate fraction of the sediments (d 13C and d180) indicate that these fragments are derived directly from the bedrock. A stalactite dated at 7355 ± 190 BP (UQ-101) was analysed for its composition in 13C and 180. The results were then compared to the isotopic composition of present day carbon dioxide and water in the cave. The conclusions were reached that the precipitation of carbonates (d 13C -60/00 and d 180 = -100/00) occurred in equilibrium with water derived mainly from snow melt. The 180 values of the concretion thus reflect winter precipitation conditions.
Bibliography of Canadian Geomorphology