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Parent mineralogy, paleoenvironment, and subsequent diagenetic and erosional history contribute to the nature of the paleoweathering proles (saprolites) developed on the South Mountain Batholith. Saprolites of three different ages (pre-Carboniferous, pre-Triassic, and pre-Pleistocene) developed on Devonian monzogranite and exhibit increases in oxidation and hydration and decreases in rare earth elements with increasing weathering. In addition, changes in Ca, Ba, Rb, Zn, Pb, Co, and other elements in the oldest saprolite indicate element mobility during weathering. Re-exposure of these partially weathered proles at surface in today's acidic and oxygen-rich environment may result in further migration of elements from these saprolites.  RESUME  La mineralogie originelle, le paleoenvironnement, et les antecedents diagenetiques et d'erosion subsequents sont autant de facteurs qui determinent les prols de paleometeorisation (saprolithes) observes dans le batholithe de South Mountain. Des saprolithes de trois epoques differentes (anterieures au Carbonifere, a l'ere triasique, et au Pleistocene) se sont formees sur du monzogranite. On observe une oxydation et une hydratation accrues, une diminution de la presence des elements du groupe des terres rares, et une meteorisation plus grande. De plus, des alterations de Ca, Ba, Rb, Zn, Pb, Co et d'autres elements dans les saprolithes plus anciens indiquent le caractere meuble des elements pendant la meteorisation. Une nouvelle exposition de ces prols en partie meteorises dans le milieu acide et riche en oxygene d'aujourd'hui pourrait entrainer une autre migration des elements contenus dans ces saprolithes.  [Traduit par la redaction]

Weathering of Devonian monzogranites as recorded in the geochemistry of saprolites from the South Mountain Batholith, Nova Scotia, Canada