The olivine grains in the troctolite of the Upper Zone are rather short and thick .
上岩带橄长岩中的橄榄石颗粒相当短粗。
The complex consisted of , from the core to the edge , peridotite , troctolite , pyroxenite and gabbro .
从岩体核心到边缘依次出现橄榄岩橄榄辉石岩辉石岩辉长岩的岩相分带。
troctolite