Re–Pt–Os Isotopic and Highly Siderophile Element Behavior in Oceanic and Continental Mantle Tectonites

摘要: Tectonically emplaced mantle rocks, such as ophiolites, abyssal peridotites, and orogenic peridotite massifs, provide a principle constraint on the composition of processes in Earth’s upper (Bodinier Godard 2003). In past, these ‘mantle tectonites’ have sometimes received different names because their history origin has been unclear. Mantle tectonites are now understood to reflect range geologic environments regarding emplacement (e.g., Dilek Furnes 2014). The advantage rocks compared xenoliths is large-scale exposure textural compositional relations between rock types that can be used identify melting, magma or fluid transport, chemical reactions, mixing deformation at spatial scales. A disadvantage most they commonly display substantial modification some elements, resulting from widespread serpentinization low temperatures. cases, this may also affect abundances several highly siderophile elements (HSE: Re, Au, PGE: Os, Ir, Ru, Rh, Pt, Pd), however, tested by comparison with unaltered similar composition. As discussed Luguet Reisberg (2016, volume), Harvey et al. volume) Aulbach own alteration issues sulfides chalcophile elements. Numerous studies obtained Os isotope and/or element abundance data many tectonites. Some focused isotopic variations, others grain size-scale variations understand small-scale distribution processes. These have, together, significantly advanced understanding fractionate HSE scales provided insights into behavior sulfide mantle—the phase typically …