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Nucleation density and morphology of quenched crystals in a pillow lava from Awa-Kamogawa,Boso Peninsula,Japan.

1981; Japan Association of Mineralogical Sciences; Volume: 76; Issue: 4 Linguagem: Inglês

10.2465/ganko1941.76.111

1883-0765

Ichiro Sunagawa, Koji Sato,

Crystallization and Solubility Studies

Densities of nucleation sites of clinopyroxene, plagioclase and spherulite were measured and their morphologies were observed from the core to the outer parts of a pillow lava of tholeiitic basalt collected at Awa-Kamogawa, Boso Peninsula. Systematic changes of nucleation densities and morphologies were observed, which were interpreted in terms of the sample's cooling history. It was concluded that the lava had solidified within an hour, and that changes in nucleation densities and morphology represented the events of this short period.