The petrogenesis of the eastern Pyrenean peridotites: an integrated study of their whole-rock geochemistry and Re-Os isotope composition

Evaluating mantle and crustal processes using isotope geochemistry

“…Burnham et al (1998) in the Pyrenees, but by the variation in the proportion of a basaltic component between the different rock types. In contrast to the suggestion of Burnham et al (1998) Moreover, Burton et a!.…”

“…Burnham et al (1998) in the Pyrenees, but by the variation in the proportion of a basaltic component between the different rock types. In contrast to the suggestion of Burnham et al (1998) Moreover, Burton et a!. (1998), by analyzing mineral separates from spinel and gamet peridotites, confIrmed that the Re budget is almost exclusively controlled by silicate phases, especially gamet when present.…”

Mantle Sulfides and their Role in Re–Os and Pb Isotope Geochronology

“…Sulfur, like Al, is moderately incompatible during partial melting (e.g., Burnham et al 1998). A sulfide mode of 0.1 % is the approximate theoretical maximum that could be expected from primitive mantle, i.e., a portion of mantle that has not undergone any melt extraction.…”

Multiple records from osmium, neodymium, and strontium isotope systems of the Nikubuchi ultramafic complex in the Sambagawa metamorphic belt, central Shikoku, Japan

“…4) through the decay of 187 Re. Chesley et al (2004) showed that Re is more mobile than Os during subduction zone metasomatism, with Re easily extracted into fluid compared with Os (Burnham et al, 1998;Righter et al, 1998). Study of a dunite vein in the Troodos Ophiolite Complex shows that Re is more enriched in the vein than in the surrounding harzburgite (Büchl et al, 2002).…”

“…The geochemical characteristics of the ultramafic rocks illustrate how they differ in character from the sedimentary rocks that are the main components of the accretionary prism, and can contribute to clarification of the origin and behavior of the accretionary prism in subduction systems. In particular, isotopic data are expected to reveal information on the origin and history of these rocks (e.g., Reisberg and Zindler, 1986;Reisberg et al, 1989;Burnham et al, 1998;Puchtel et al, 1999). The Nikubuchi ultramafic complex exhibits clear igneous layering in the Besshi area.…”