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- W2183863344 abstract "The secondary mineralogy of altered diabase in the lower sheeted dikes cored during Leg 148 comprises an earlier hightemperature assemblage of amphibole, diopside, anorthitic plagioclase, chlorite, titanite, and apatite, overprinted by a subsequent alteration at lower temperatures that led to actinolite, albite, chlorite or chlorite-smectite, talc, epidote, and hydrous calcsilicate (now laumontite). Secondary minerals occur as a pervasive replacement of original igneous minerals; however, they are modally most abundant within irregular patches, centimeter-scale halos of hydrothermal veins, and millimeter-scale veins. The lower sheeted dikes of Leg 148 may have been altered initially within the of an axial hydrothermal system. Secondary plagioclase compositions range from anorthite to albite: all are K2O poor ( 400°C) characteristic of the mid-ocean-ridge reaction zone. Later generations of actinolite + chlorite + albite and epidote + quartz most likely formed at lower temperatures during the waning of axial hydrothermal activity. The presence of calcic plagioclase in the high-temperature alteration assemblage challenges the widely held notion, based upon oftsampled altered basalts, diabases, and spilites, that the dominant plagioclase of the mid-ocean-ridge reaction zone is albite. Evidence from Hole 504B, as well as recent experimental studies, suggests that albite is a later plagioclase in the reaction zone, which formed during waning hydrothermal conditions." @default.
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- W2183863344 date "1996-05-01" @default.
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- W2183863344 title "Chemistry and Origin of Secondary Minerals from the Deep Sheeted Dikes Cored during Leg 148 (Hole 504B)" @default.
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- W2183863344 doi "https://doi.org/10.2973/odp.proc.sr.148.126.1996" @default.
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