40Ar/39Ar ages and petrogenesis of the West Iberian Margin onshore magmatism at the Jurassic–Cretaceous transition: Geodynamic implications and assessment of open-system processes involving saline materials

Abstract The West Iberian Margin (WIM) preserves onshore testimonies of three Mesozoic magmatic cycles. In this paper we present and discuss 40 Ar/ 39 Ar ages and geochemical data for the second cycle, which occurred at least from 148 Ma to 140 Ma, during the late stages of an important extensional event associated with the Iberia–Newfoundland rifting. The related lithospheric stretching induced magma genesis by adiabatic decompression. Primitive rocks are mildly alkaline but evolved to SiO 2 -saturated and oversaturated rocks at “high” pressure. Magmas sampled a source of fairly homogenous composition characterized by Sr and Nd isotopic compositions ( e Nd i from + 1.6 to + 4.2), more enriched than the typical N-MORB source. Magmas were generated at the top of the garnet zone. Considering the thickness of the lithosphere and the geochemical constraints, an origin by melting of a metasomatized domain of the lithosphere is favored. The composition of these onshore magmas is somewhat distinct from the quasi coeval magmas emplaced offshore, which is interpreted as a result of the less important onshore lithospheric stretching, leading to lower degrees of partial melting. This favored the contribution of lithospheric metasomatized domains to onshore magmas. Rocks intruded two sectors of the Lusitanian Basin separated by the Nazare Fault and characterized by distinct subsidence rates during the Jurassic. The fact that the rocks to the north of the Nazare Fault are significantly more evolved indicates the more important development of magma chambers in the north, suggesting distinct thermal profiles for those two sectors. Such magma chambers enabled the “high-pressure” fractionation necessary to drive magma compositions from Ne-normative to SiO 2 - saturated and -over-saturated. The rocks cropping out south of the Nazare fault are clearly less evolved, and its variability is mostly due to different partial melting events. Some rocks present evidence of post-magmatic processes involving neighboring Jurassic evaporite materials, leading to an increase in the Na 2 O content and 87 Sr/ 86 Sr ratio.