NDLI: Epitactic Overgrowths and Intergrowths of Clinopyroxene on Orthopyroxene : Implications for Paths of Crystallization , 1881 Lava Flow Mauna Loa Volcano

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Epitactic Overgrowths and Intergrowths of Clinopyroxene on Orthopyroxene : Implications for Paths of Crystallization , 1881 Lava Flow Mauna Loa Volcano

Content Provider	Semantic Scholar
Author	Otn, Ewp M. A. W. S. Z. S. T.
Copyright Year	2006
Abstract	The l88l tholeiitelavaflow on Maunal,oaVolcano, Hawaii, contains epitactic overgrowths andintergrowths of clinopyroxene on orthopyroxene. The clinopyroxene overgrowths form only on faces parallel to the optic axial plane of orthopyroxene, (1@). The lava flow contqins microphenocrysts of olivine and pyroxene in a fine-grai:red groundmass of plagioclase, three pyroxenes, opaque minemls, and dat{< slass. The average coryosition of orthopyroxene is En estg. The e.pitactic overgrowtbs consist of clinorpyroxene whose composition ranges from pigeonite to augite. The pyroxenes forming the epitactic overgrowths can be distinguished from one anotherby theirreliefagai:rstorthopyroxenein sections cutnormal to (10). The olivinemicrophenocrysts arenormally zone4 with a range in composition from Forz to Fo73. Plagioclase is a groundmass phase in the 1881 lava flow and displays normal zoning. Crystallization paths predicted by thermodynamic modeting (MELTS) reproduce the minsl2l ge6positions found. The crystallizrtion sequence required by the epitactic relationship is ortho'pyroxene followed by pigeonite or augite. The skeletal naore of t.he olivine is consistent with is sanrration laler than orthopyroxene. At pressures greater than 0. I 8 GPa, melts v/ith the composition ofthe rock never become saturated with olivine. If, however, a fractionation path is followed at a pressure greater than 0.18 GPa, then the sequence of pyroxenes found in the epitactic overgrowths would be develo@. If, after rcaching ctinopyroxene saturation, 1lg magma is transported to shallower depths where pressures are less than approximately 0.I GP4 then the melt would become saturated in olivine.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://rruff.info/doclib/cm/vol35/CM35_909.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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