This basalt belongs to the calc-alkaline rock series and is relatively rich in calcium and poor in alkali. It does not have a unique region in chemical composition, but is included in the tholeiite or high-alkaline basalt regions. In particular, high-alumina basalt is often used synonymously with calc-alkaline basalt. In Japan, calc-alkaline basalt is often referred to as a rock when augite and hypersine coexist in the groundmass [Geological Society Research Association: 1996]. Source: Asakura Publishing Dictionary of Petrology Information |
カルク─アルカリ岩系に属する玄武岩で,比較的カルシウムに富み,アルカリに乏しい.化学組成に独自の領域はなく,ソレアイトか高アルカリ玄武岩領域に含まれる.特に高アルミナ玄武岩をカルク─アルカリ玄武岩と同義に用いる場合が多い.日本では石基にオージャイトとハイパーシンが共存している場合をカルク─アルカリ玄武岩とすることが多い[地学団体研究会 : 1996]. 出典 朝倉書店岩石学辞典について 情報 |
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