Petrographic and mineralogical study of new EH melt rocks and a new enstatite chondrite grouplet

Abstract

Abstract— Enstatite chondrites are classified into EH and EL groups, and some of them were melted once. In this paper, we report petrography and mineral chemistry of five new Antarctic enstatite chondrites. Yamato 793225 is characterized by intermediate properties between the EH and EL groups and probably represents a new grouplet of enstatite chondrites. The three paired meteorites (Y‐8404, Y‐8414 and Y‐86004) may have cooled rapidly near the surface of the parent body as impact EH melt rocks. Yamato 82189 is also classified as EH melt rock, but it experienced slow cooling as did Y‐793225. Yamato 82189 contains the first occurrence of phlogopite in enstatite meteorites.