troctolite


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troctolite

(ˈtrɒktəˌlaɪt)
n
a rare type of coarse-grained igneous rock generally composed mainly of olivine and feldspar
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Ichiyama and Ishiwatari [11] suggested that the Yakuno ophiolite in the Yakuno-cho area (Figure 1) originated from a BAB crust, consisting of metabasalt and metagabbro of BAB affinities and a minor amount of troctolite.
and Constantin, M., 1991, Syn- and post-kinematic intrusions of troctolite, gabbro, and peridotite into layered gabbroic cumulates in the Bay of Islands ophiolite: genesis of anorthosite by partial assimilation, and troctolite by hybridization: Geological Survey of Canada, Current Research, Paper 91-1, part D, p.
Bogatikov & Birkis (1973) subdivided the mafic rocks distributed in the southern part of the Riga batholith into two groups: one consists almost exclusively of anorthosites, while the other features a more complex association of rocks, including anorthosite, gabbro-anorthosite, gabbronorite, troctolite, and melatroctolite.
Drilling in the new discovery area southeast of the ovoid zone is ongoing and to date has begun to define a portion of an expansive, wedge-shaped troctolite body, thickening from 100 m to over 750 m and open in a southeast direction.
Solidification of mushes produces cumulate gabbros (troctolite and iron-titanium oxide gabbro in the table) with compositions that are significantly different from magma compositions (basalts).
17 SCIENCE that the rarity of this combination, called a cordierite-spinel troctolite, among the Apollo moonrock samples suggests it probably formed far enough down that only a major cataclysm, such as a meteorite impact, could have exposed it to view.
This complex is dominated by a layered cumulate sequence, that grades from troctolite through olivine gabbro to gabbro (Fig.
Stephen Gabbro consists of a core of dunite and troctolite, surrounded by olivine gabbro and gabbro layers.