Kaersutite and pargasite in xenoliths included in monzodiorite at Fuka, Okayama Prefecture, Japan

Amphibolite and clinopyroxene amphibolite occurred as xenoliths in monzodiorite dikes that intruded into limestone at Fuka, Okayama Prefecture. The amphibolite xenolith is composed mainly of amphibole and plagioclase. The clinopyroxene amphibolite xenolith is composed mainly of clinopyroxene, biotite, amphibole and plagioclase. The amphibole also occurred around the prehnite, grossular, clinopyroxene and calcite bearing veinlets that were formed in the clinopyroxene amphibolite xenoliths. The microprobe analyses of the amphiboles gave XMg=0.53−0.58, 3.3−4.6 wt% TiO2 and 1.3−2.1 wt% K2O. The compositions corresponded to kaersutite-pargasite.