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New perspectives on the origin of olivine-rich troctolites and associated harrisites from the Ligurian ophiolites (Italy)

View ORCID ProfileMaria Rosaria Renna, Riccardo Tribuzio and Luisa Ottolini
Journal of the Geological Society, 173, 916-932, 22 July 2016, https://doi.org/10.1144/jgs2015-135
Maria Rosaria Renna
1Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Università di Messina, Viale F. Stagno D'Alcontres 31, 98166 Messina, Italy
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  • ORCID record for Maria Rosaria Renna
  • For correspondence: mrenna@unime.it
Riccardo Tribuzio
2Dipartimento di Scienze della Terra e dell'Ambiente, Università di Pavia, Via Ferrata 1, 27100 Pavia, Italy
3CNR–Istituto di Geoscienze e Georisorse, U. O. di Pavia, Via Ferrata 1, 27100 Pavia, Italy
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Luisa Ottolini
3CNR–Istituto di Geoscienze e Georisorse, U. O. di Pavia, Via Ferrata 1, 27100 Pavia, Italy
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Abstract

The mid-ocean ridge (MOR)-type gabbroic sequences from the Internal Ligurian ophiolites include olivine-rich troctolite lenses up to tens of metres thick. For one of these lenses, a portion of metre-scale thickness characterized by skeletal to dendritic olivines (harrisites) was observed near the contact with host gabbros. Spinels from the olivine-rich troctolites locally include Ti-pargasite to kaersutite frequently associated with phlogopite to Na-phlogopite. Spinel-hosted amphibole displays rare earth element (REE) patterns characterized by a negative Eu anomaly, thereby recording a magmatic process associated with plagioclase segregation. The amphiboles show variable depletion of light REE (LREE) relative to middle REE (MREE), and heavy REE (HREE) that are weakly enriched to depleted with respect to MREE. Crystallization of the inclusion-bearing spinels is attributed to cooling of hybrid melts that originated by interaction between primitive melts and gabbro-related melts relatively rich in SiO2 and incompatible elements. Clinopyroxene and amphibole from the harrisites show extensive variability for trace element compositions, albeit characterized by subparallel incompatible element patterns. This chemical variability was most probably acquired in response to rapid crystal growth related to undercooling of the harrisite parental melt. We propose that the melt undercooling was related to interaction of a primitive melt batch with a gabbroic crystal mush.

Supplementary material: Details of the analytical technique are available at http://doi.org/10.6084/m9.figshare.c.3284312

  • © 2016 The Author(s)
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Journal of the Geological Society: 173 (6)
Journal of the Geological Society
Volume 173, Issue 6
November 2016
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New perspectives on the origin of olivine-rich troctolites and associated harrisites from the Ligurian ophiolites (Italy)

Maria Rosaria Renna, Riccardo Tribuzio and Luisa Ottolini
Journal of the Geological Society, 173, 916-932, 22 July 2016, https://doi.org/10.1144/jgs2015-135
Maria Rosaria Renna
1Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Università di Messina, Viale F. Stagno D'Alcontres 31, 98166 Messina, Italy
  • Find this author on Google Scholar
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  • ORCID record for Maria Rosaria Renna
  • For correspondence: mrenna@unime.it
Riccardo Tribuzio
2Dipartimento di Scienze della Terra e dell'Ambiente, Università di Pavia, Via Ferrata 1, 27100 Pavia, Italy
3CNR–Istituto di Geoscienze e Georisorse, U. O. di Pavia, Via Ferrata 1, 27100 Pavia, Italy
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Luisa Ottolini
3CNR–Istituto di Geoscienze e Georisorse, U. O. di Pavia, Via Ferrata 1, 27100 Pavia, Italy
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New perspectives on the origin of olivine-rich troctolites and associated harrisites from the Ligurian ophiolites (Italy)

Maria Rosaria Renna, Riccardo Tribuzio and Luisa Ottolini
Journal of the Geological Society, 173, 916-932, 22 July 2016, https://doi.org/10.1144/jgs2015-135
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  • Article
    • Abstract
    • The Internal Ligurian ophiolites
    • Internal compositional heterogeneities of the olivine-rich troctolites
    • Main petrological characteristics of the olivine-rich troctolites
    • Selected samples
    • Trace element compositions of minerals
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    • Concluding remarks
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