In:
Science, American Association for the Advancement of Science (AAAS), Vol. 277, No. 5324 ( 1997-07-18), p. 352-355
Abstract:
Shock-induced melt veins in the Acfer 040 L5-6 (S6) chondrite contain a previously unknown set of high pressure phases consisting of amorphous grains similar in composition to majorite, MgSiO 3 -ilmenite, and ringwoodite. The amorphous grains have compositions that are similar to those of synthetic MgSiO 3 -perovskites from chemically complex systems and are inferred to be MgSiO 3 -perovskite that crystallized from the melt at high pressure and temperature and subsequently amorphized after pressure release. The ilmenite represents a natural occurrence of a potentially important mineral in Earth's mantle. The MgSiO 3 -perovskite–MgSiO 3 -ilmenite–ringwoodite assemblage is not predicted by phase equilibria studies, but appears to result from crystallization of a melt at pressures above 26 gigapascals.
Type of Medium:
Online Resource
ISSN:
0036-8075
,
1095-9203
DOI:
10.1126/science.277.5324.352
Language:
English
Publisher:
American Association for the Advancement of Science (AAAS)
Publication Date:
1997
detail.hit.zdb_id:
128410-1
detail.hit.zdb_id:
2066996-3
detail.hit.zdb_id:
2060783-0
SSG:
11
Permalink