Ridge axis deformation and coeval melt migration within layer 3 gabbros: evidence from the Lizard Complex, U.K
Article Abstract:
There are many different chemical and mineralogical changes under different pressure and temperature conditions in ridge-parallel extensional shear zones within the layer 3 gabbros of Lizard ophiolite. Tectonic exhumation of lower crustal levels by a listric fault mechanism during amagmatic extension at a slow-spreading centre also occur. Migration and impregnation of an evolved iron-titanium-rich silica-poor melt along shear zones is due to deformation within mid-crustal level of layer three.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1995
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Trace element distribution within olivine-bearing gabbros from the Northern Apennine ophiolites (Italy): evidence for post-cumulus crystallization in MOR-type gabbroic rocks
Article Abstract:
Gabbroic rocks from present-day slow spreading ridges and those from the Northern Apennine ophiolites were confirmed to be very similar. This conclusion was drawn after clinopyroxene and plagioclase exhibited zoning which can be attributed to post-cumulus crystallization of interstitial fluid. Also, it is probable that the exotic component in the interstitial fluid may be due to highly evolved, slightly light rare earth-enriched liquid in the cumulative pile.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1999
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Mg-metasomatism of oceanic gabbros and its control of Ti-clinohumite formation during eclogitization
Article Abstract:
A study was conducted to analyze mineralogical and chemical data on titanium-clinohumite metagabbros to examine the metasomatic changes that promoted the formation of titanium-clinohumite-bearing assemblages after original gabbroic material. The process of magnesium-metasomatism was also analyzed. Results indicated that titanium-clinohumite diskelets are closely related to metarodingites and eclogites, and are enclosed inside serpentinized ultramafites.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1999
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