[1] The behavior of synthetic-powdered 57Fe-enriched enstatite (Mg0.980Fe0.020(5))(Mg0.760Fe0.240)Si2O6 has been explored by X-ray diffraction (XRD) and nuclear resonant inelastic X-ray scattering (NRIXS). The Pbca-structured enstatite sample was compressed in fine pressure increments for our independent XRD measurements. One structural transition between 10.1 and 12.2 GPa has been identified f...

Introduction: Enstatite chondrites have remarkable properties: they were formed in a reducing environment, they are putatively similar to precursor material of Earth, Venus, or Mercury, have a terrestrial oxygen isotopic composition and an uncommon noble gas signature [1-5]. Trapped noble gases in Echondrites are intermediate between solar and chondritic composition and consist of two component...

New shock wave data for Bamle enstatite (Mgo. s•,Feo.•JSiOs in the range from 60480 kb indicate a Hugoniot elastic limit of 67 ñ 10 kb and a possible phase-transition-produced shock front of 135 _ 10 kb amplitude. Above the latter shock pressure, states in a mixedphase regime are achieved up to •350 kb, above which the Hugoniot states are believed to represent the equation of state of a shock-i...

The Open University's repository of research publications and other research outputs Solar noble bases in enstatite chondrites and implications for the formation of the terrestrial planets Conference Item

EH6 Chondrites: The two principal groups of en-statite chondrites differ in their proportions of petro-logic types. Among EL chondrites, ~20% are type 3 and ~60% are type 6, whereas among EH chondrites, ~75% are type 3 and ~3% are type 6. As of this writing , there are five EH6 chondrites listed in the Meteor-itical Bulletin Database (MBD): A-882039, Y-793225 (EH6-an), Y-8404, Y-980211 and Y-98...

All ten known aubrites (enstatite achondrites) as well as Happy Canyon and Mt. Egerton, related anomalous meteorites, have been studied in order to understand their origin and relationship to enstatite chondrites. Mineralogically, aubrites contain 75-9B% enstatite (En98.76-99.54), 1-16% plagioclase (Anl.S-B.:), O.Z-K.l^r diopside (Wo40.1-46.1). 0.3-10.07f olivine (Fo99.79-99,99), <0.l3.7% metal...

OH-defects in orthoenstatite were studied experimentally between 4 and 8 GPa at 1150 °C in the system CaO-MgO-Al2O3-SiO2-Cr2O3-Na2O, leading to phase assemblages enstatite ± forsterite ± diopside ± garnet. In enstatite coexisting with garnet, total OH is negatively correlated with pressure. Conversely, in Al-poor systems without garnet, total OH is positively correlated with pressure, and both ...