Muroto

Cape Shiono (Wakayama Pref.) Gabbro(coarse): Field width = 8.8mm A caption is in the bottom. The Image is XPL on mouse to PPL
潮岬のはんれい岩（粗粒の部分）　横幅8.8mm．写真の下に説明．薄片写真：クロスポーラー（XPL)．マウスを乗せるとオープンポーラー（PPL)．

Cape Shiono. In this loaction, the intrusion age is similar to Muroto instrusion. However, the looks is quite different. At this site, gabbros are black or brown colored and no white patches instead. Brown color is from oxidization. In this thin-section, large crystals are plagioclase and clino-pyroxenes. And the olivines are small and often euhedral. Let's guess again the order of crystallization of olivine, clino-pyroxene and plagioclase.
潮岬のはんれい岩．貫入岩体の時代は室戸とほぼ同じとされる．しかしこの場所のはんれい岩は室戸と異なり斜長石の白が肉眼では目立たない．また大粒の鉱物は斜長石と単斜輝石．かんらん石は小さく，自形をしたものが多い．ここでもまた，かんらん石，単斜輝石，斜長石の結晶化の順序を考えてみよう！
参考文献は以下のとおり．https://www.jstage.jst.go.jp/article/geosoc1893/87/6/87_6_383/_pdf/-char/ja