Startseite Non-hydrostatic stress field orientation inferred from orthopyroxene (Pbca) to low-clinoenstatite (P21/c) inversion in partially dehydrated serpentinites
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Non-hydrostatic stress field orientation inferred from orthopyroxene (Pbca) to low-clinoenstatite (P21/c) inversion in partially dehydrated serpentinites

  • Maxime Clément EMAIL logo , José Alberto Padrón-Navarta , Andréa Tommasi und David Mainprice
Veröffentlicht/Copyright: 28. Mai 2018
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 103 Heft 6

Abstract

The direction of the main compressional stress, at the origin of the orthoenstatite (Oen) inversion to low-clinoenstatite (LCen) lamellae observed in partially dehydrated antigorite-serpentinites, has been inferred based on the crystallographic orientation relationship between Oen host crystals and the LCen lamellae by means of electron backscattered diffraction (EBSD) combined with optical microscopy. This technique was applied to two samples: a transitional lithology (Atg-Chl-Ol-Opx) and a metaperidotite (Chl-Ol-Opx), both collected within 3 m from the serpentinite dehydration front exposed in Cerro del Almirez (Betic cordillera, South Spain). The metaperidotite displays a clear crystal-preferred orientation (CPO) of both Oen and LCen. The transitional lithology shows weaker CPOs. The metaperidotite contains LCen crystals representative of two possible variants of the Oen to LCen martensitic transformation with distinct orientations, which are consistent with a unique compression direction at ca. 45° to the normal to the foliation and to the lineation of the precursor serpentinite. In contrast, in the transitional sample, calculated compressional stresses display an almost random orientation. The observation of such a variation in the stress field recorded by two samples separated by <3 m rules out a tectonic origin for the stresses producing the LCen in these metaperidotites. We interpret therefore these stresses as resulting from compaction during dehydration. The present analysis implies that compaction-related stresses, though variable at the meter scale, may be organized at the centimeter scale during dehydration reactions of serpentinite.

Keywords: Clinoenstatite; stress field; martensitic transformation; serpentinite; dehydration reactions; non-hydrostatic stress

Acknowledgments

We are grateful to F. Barou for his technical assistance in the EBSD-SEM CNRS-INSU national facility at Géosciences Montpellier. We acknowledge C.J. Garrido and V. López Sánchez-Vizcaíno for constructive discussions, Rüdiger Kilian and Ralf Hielscher for suggestions to improve MTEX scripts and the reviewer for his relevant comments and remarks. C. Nevado and D. Delmas supplied high-quality polished thin sections for EBSD measurements. This work has been funded by a Ph.D. grant (GAIA, Université Montpellier) to M.C. and by the CNRS-INSU (TelluS/SYSTER) project MinCompact (AO2017–996352).

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Received: 2017-11-2
Accepted: 2018-3-6
Published Online: 2018-5-28
Published in Print: 2018-6-26

© 2018 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.2138/am-2018-6362
Schlagwörter für diesen Artikel
Clinoenstatite; stress field; martensitic transformation; serpentinite; dehydration reactions; non-hydrostatic stress

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  12. Immiscible sulfide melts in primitive oceanic magmas: Evidence and implications from picrite lavas (Eastern Kamchatka, Russia)
  14. Snapshots of primitive arc magma evolution recorded by clinopyroxene textural and compositional variations: The case of hybrid crystal-rich enclaves from Capo Marargiu Volcanic District (Sardinia, Italy)
  16. Three-dimensional distribution of primary melt inclusions in garnets by X-ray microtomography
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  20. Determination of Al/Si order in sillimanite by high angular resolution electron channeling X-ray spectroscopy, and implications for determining peak temperatures of sillimanite
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