WebG&G’ s newest section explores how diamonds form in the deep earth. Web31 dec. 1993 · Abstract: Compositions of ~2500 spinel-olivine pairs and 400 melt inclusion-spinel pairs have been analysed from 36 igneous suites from oceanic, arc and intraplate tectonic settings. Our data confirm that Cr-spinel mg-number is largely controlled by melt composition, but also influenced by octahedral site substitutions, and rate of …
Power law olivine crystal size distributions in lithospheric mantle ...
Web21 sep. 2024 · Knowledge of the formation and evolution of cratonic subcontinental lithospheric mantle is critical to our understanding of the processes responsible for continental development. Here, we report the deformation microstructures and lattice preferred orientations (LPOs) of olivine and pyroxenes alongside petrological data from … Web1 mrt. 2024 · We attribute the decrepitation of melt inclusions in olivine to the rapidly increasing difference between the melt pressure in the inclusions, captured at mantle depth, and the decreasing confining stress to which the host olivines were exposed during magma ascent and after emplacement. dank city server
Resultats de recherche pour
Web4 aug. 2024 · Whereas olivine cumulates are widely distributed, magmatic olivine fabrics in nature are uncommon because of overprinting by deformation, emplacement, and late-stage alteration . However, weak B-type-like CPO patterns have been documented for olivine, probably related to compaction and shearing during the crystallization and accumulation … Web12 okt. 2024 · Olivine-hosted melt inclusions from two phonotephrite and one basaltic trachyandesite samples were chosen for major- and trace-element and Pb isotope analyses ( Fig. 3 ). OLIVINE MAJOR-, MINOR-, AND TRACE-ELEMENT ANALYSES Olivine major-, minor-, and trace-element analyses were caried out on polished thin sections. Web11 dec. 2024 · Incompatible element ultra-depleted melt (UDM) has occasionally been found as olivine-hosted inclusion in plume-related oceanic island basalts and mid-oceanic ridge basalts and is genetically linked with the involvement of lower oceanic gabbroic crust. dankcity collective