@article{oai:nipr.repo.nii.ac.jp:00004678, author = {Mitreikina,Olga B. and Zinovieva,Nina G. and Granovsky,Lev B.}, journal = {Proceedings of the NIPR Symposium on Antarctic Meteorites}, month = {Mar}, note = {P(論文), Detailed studies of ureilites (Novo-Urei, Havero, Dyalpur, Kenna) showed that this type of achondrite had formed in a similar manner to intrusive rocks intensely affected by explosive reducing metal melts rich in hydrocarbon fluids. The reverse zoning of olivine and pyroxene of the ureilite resulted from these alterations. The reverse zoned structure is accompanied by an increase of Mg content in the margins of both minerals and the formation of so-called "interstitial material", which is a product of intense recrystallization and partial melting of the olivine and pyroxene at their contacts with metal-carbon veins. The zoning of the primary minerals is controlled by the configuration of the veins. The higher the intensity of the recrystallization process, the more extensive are alterations of the initial rocks exerted by the hydrocarbon fluids, which produced the lherzolite-type pyrope-diamond assemblage.}, pages = {215--224}, title = {Magmatic replacement processes in ureilites}, volume = {8}, year = {1995} }