Petrogenesis of anomalous Queen Alexandra Range enstatite meteorites and their relation to enstatite chondrites, primitive enstatite achondrites, and aubrites

Aubrites: Their origin and relationship to enstatite chondrites

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...

Enstatite Meteorites – Samples of the Inner Protoplanetary Disk?

Introduction: The two groups of enstatite chondrites (EH and EL) and aubrites, their differentiated counterparts, are a unique suite of specimens that formed under highly reducing conditions within the solar nebula, possibly on three separate parent bodies [1]. The reduced nature of the meteorites is shown by their unusual mineralogy, characterised by the presence of abundant sulphides. They al...

Be-B IN ENSTATITE AND ORDINARY CHONDRITES: A PRELIMINARY STUDY

Dynamic compression of enstatite

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...

Investigation of Presolar Silicate Grains from Enstatite Chondrites