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spilite
Spilite (from (ギリシア語:σπιλάς)) is a fine-grained igneous rock, resulting particularly from alteration of oceanic basalt.
The term was introduced into the geological literature by Alexandre Brongniart in 1827.〔Manfred Schidlowski: ''Spilite and the basal tables volcanism''. Natural sciences, Bd. 56, No. 10, P. 488-493, Springer publishing house, Berlin/Heidelberg 1969, ISSN 0028-1042〕 Spilite is formed when basaltic lava reacts with seawater, or from hydrothermal alteration when seawater circulates through hot volcanic rocks.〔Monica Price, Kevin Walsh, ''Pocket Nature, Rocks and Minerals'', page 63. Dorling Kindersley.〕
It is a metasomatic rock with a microscopic or very-fine grain size produced by hydrothermal alteration of basalt, and composed of albite or oligoclase, together with chlorite, epidote, calcite, and actinolite.〔''McGraw-Hill encyclopedia of the geological sciences'', page 793〕 Spilite is veined by calcite or chalcedony, and vesicles and cavities are filled with secondary minerals.〔 It is generally classed with basalts, and it often retains many textural and structural features characteristic of basalt.〔
==Notes==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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