Original paper

X-ray diffraction characteristics of calcic plagioclase from eucrites as well as lunar highland and Archean anorthosites

Tagai, Tokuhei; Hoshi, Takeshi; Suzuki, Masaya

European Journal of Mineralogy Volume 10 Number 1 (1998), p. 125 - 132

38 references

published: Jan 26, 1998
manuscript accepted: Sep 22, 1997
manuscript received: Aug 23, 1996

DOI: 10.1127/ejm/10/1/0125

BibTeX file

ArtNo. ESP147051001012, Price: 29.00 €

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Abstract

Abstract X-ray intensity distributions of diffuse c-reflections were investigated in calcic plagioclases from different parageneses including eucrite (ALH85001, Moore County, Moama, Serra de Magé), lunar anorthosite (Lunar 76335) and terrestrial Archean anorthosite (BVL-105), thus representing various stages of crustal evolution in the early solar system. The profiles of the c-reflection were measured along directions parallel and normal to the diffuse streak, and the corresponding domain sizes were calculated from their FWHMs. Lunar highland anorthite shows the largest c-domain size, which indicates the slowest cooling rate among the studied specimens. The Moore County anorthite shows a very small domain size in spite of the plutonic texture, which may indicate reheating after the cumulate formation process.

Keywords

plagioclaseeucritelunar highlandArcheanc-domain size