Wehlight - Wehlight

Japanese: ウェーライト - うぇーらいと
Wehlight - Wehlight

…In general, pyroxene is present in addition to olivine, and depending on the formation conditions, spinel, garnet, plagioclase, amphibole, biotite, and other minor minerals may be included. Olivine is 90% or more and pyroxene is low, and dunite is the mineral that contains more than 90% olivine. For those that contain less than 90% olivine, the mineral is called harzburgite if it contains more orthopyroxene, wehrlite if it contains more clinopyroxene, and lherzolite if it contains more of both, depending on the ratio of pyroxenes. There are three types of occurrence: (1) those that form the lower layer of a basic layered differentiated body, (2) those that occur in orogenic or tectonic belts, and (3) those that are included as nodules in alkali basalt or kimberlite. …

*Some of the terminology explanations that mention "Wehrlite" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…一般にカンラン石のほかに輝石が伴われ,生成条件によってスピネル,ザクロ石,斜長石,角セン石,黒雲母などが副成分鉱物として含まれる。カンラン石が90%以上で,輝石の少ないものをダナイトduniteと呼び,それ以下のものについては,伴われる輝石の量比によって,斜方輝石の多いものをハルツバージャイトharzburgite,単斜輝石の多いものをウェーライトwehrlite,両方とも多いものをレルゾライトlherzoliteと呼ぶ。 産状は,(1)塩基性層状分化岩体の下部層を構成するもの,(2)造山帯ないし構造帯に産出するもの,(3)アルカリ玄武岩やキンバーライト中に団球状に包有されているものの3種類がある。…

※「ウェーライト」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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