Abstract This study of Sr-Nd initial isotopic ratios plutons from the North Patagonian batholith (Argentina and Chile) revealed that a secular evolution spanning 180 m.y., Jurassic to Neogene, can be established in terms magma sources, which turn are correlated with changes tectonic regime. The provenance composition end-member components source magmas represented by (87Sr/86Sr 143Nd/144Nd) plu...

Introduction: Throughout the history of Mars, aqueous solutions should have existed at some depths below the surface. On early Mars, high geothermal gradients and intensive volcanic activity would have favored near-surface existence of aqueous solutions and sapping of ground water (e.g., [1]). During later epochs, solutions could have been stable deep below the surface, usually below ice-bearin...

New Caledonia is known for the diversity of its geological substrates, which have shaped highly original and diverse flora. Here, effect soil on vegetation described several contact zones between ultramafic other substrates. The main formations soils derived from rocks are described: low medium altitude rainforests, high maquis. types maquis biological characteristics species also presented.