Closed-sytem geochemical recycling of crustal materials in alpine-type peridotite

Tomoaki Morishita; Shoji Arai; Fernando Gervilla; David H. Green

doi:10.1016/S0016-7037(02)01079-7

Closed-sytem geochemical recycling of crustal materials in alpine-type peridotite

Tomoaki Morishita^*, Shoji Arai, Fernando Gervilla, David H. Green

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

38 Citations (Scopus)

Abstract

We examined aluminous mafic rock (with or without corundum or sapphirine) alternating with peridotite from the Ronda peridotite massif, southern Spain. On the basis of petrographic characteristics, these mafic rocks show a decompression history from high pressure (P > 1.5 GPa), but on the basis of their geochemical characteristics, they are crystal accumulates of plagioclase, clinopyroxene, and olivine formed within the lower crust (P < 1 GPa). A complex evolution history, including higher-pressure recrystallization after initial formation as cumulate gabbros at lower-pressure conditions, is proposed. The aluminous mafic rocks and their peridotite hosts are inferred to be recycled crustal materials now observed as centimeter-scale layered components in alpine-type peridotite. The rocks retained their original cumulate compositions; that is, their compositions were not affected by melting and metasomatic modifications during subduction, intense deformation within the upper mantle, and upwelling to the surface.

Original language	English
Pages (from-to)	303-310
Number of pages	8
Journal	Geochimica et Cosmochimica Acta
Volume	67
Issue number	2
DOIs	https://doi.org/10.1016/S0016-7037(02)01079-7
Publication status	Published - 15 Jan 2003

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title = "Closed-sytem geochemical recycling of crustal materials in alpine-type peridotite",

abstract = "We examined aluminous mafic rock (with or without corundum or sapphirine) alternating with peridotite from the Ronda peridotite massif, southern Spain. On the basis of petrographic characteristics, these mafic rocks show a decompression history from high pressure (P > 1.5 GPa), but on the basis of their geochemical characteristics, they are crystal accumulates of plagioclase, clinopyroxene, and olivine formed within the lower crust (P < 1 GPa). A complex evolution history, including higher-pressure recrystallization after initial formation as cumulate gabbros at lower-pressure conditions, is proposed. The aluminous mafic rocks and their peridotite hosts are inferred to be recycled crustal materials now observed as centimeter-scale layered components in alpine-type peridotite. The rocks retained their original cumulate compositions; that is, their compositions were not affected by melting and metasomatic modifications during subduction, intense deformation within the upper mantle, and upwelling to the surface.",

author = "Tomoaki Morishita and Shoji Arai and Fernando Gervilla and Green, \{David H.\}",

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T1 - Closed-sytem geochemical recycling of crustal materials in alpine-type peridotite

AU - Morishita, Tomoaki

AU - Arai, Shoji

AU - Gervilla, Fernando

AU - Green, David H.

PY - 2003/1/15

Y1 - 2003/1/15

N2 - We examined aluminous mafic rock (with or without corundum or sapphirine) alternating with peridotite from the Ronda peridotite massif, southern Spain. On the basis of petrographic characteristics, these mafic rocks show a decompression history from high pressure (P > 1.5 GPa), but on the basis of their geochemical characteristics, they are crystal accumulates of plagioclase, clinopyroxene, and olivine formed within the lower crust (P < 1 GPa). A complex evolution history, including higher-pressure recrystallization after initial formation as cumulate gabbros at lower-pressure conditions, is proposed. The aluminous mafic rocks and their peridotite hosts are inferred to be recycled crustal materials now observed as centimeter-scale layered components in alpine-type peridotite. The rocks retained their original cumulate compositions; that is, their compositions were not affected by melting and metasomatic modifications during subduction, intense deformation within the upper mantle, and upwelling to the surface.

AB - We examined aluminous mafic rock (with or without corundum or sapphirine) alternating with peridotite from the Ronda peridotite massif, southern Spain. On the basis of petrographic characteristics, these mafic rocks show a decompression history from high pressure (P > 1.5 GPa), but on the basis of their geochemical characteristics, they are crystal accumulates of plagioclase, clinopyroxene, and olivine formed within the lower crust (P < 1 GPa). A complex evolution history, including higher-pressure recrystallization after initial formation as cumulate gabbros at lower-pressure conditions, is proposed. The aluminous mafic rocks and their peridotite hosts are inferred to be recycled crustal materials now observed as centimeter-scale layered components in alpine-type peridotite. The rocks retained their original cumulate compositions; that is, their compositions were not affected by melting and metasomatic modifications during subduction, intense deformation within the upper mantle, and upwelling to the surface.

UR - https://www.scopus.com/pages/publications/0037438931

U2 - 10.1016/S0016-7037(02)01079-7

DO - 10.1016/S0016-7037(02)01079-7

M3 - Article

SN - 0016-7037

VL - 67

SP - 303

EP - 310

JO - Geochimica et Cosmochimica Acta

JF - Geochimica et Cosmochimica Acta

IS - 2

ER -

Closed-sytem geochemical recycling of crustal materials in alpine-type peridotite

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