bastite

...Cecilia Viti; Marcello Mellini Abstract Retrograde serpentinized peridotites, belonging to the Internal Ligurid terrains, occur in eastern Elba island, Italy. The mesh texture (with pyroxene bastites) is the typical textural arrangement. The mesh rims are apparently fibrous, with negative optical...

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Micro-Raman spectra of <span class="search-highlight">bastite</span> antigorite ( A ), <span class="search-highlight">bastite</span> lizardite ( B ), m...

Micro-Raman spectra of bastite antigorite ( A ), bastite lizardite ( B ), m...

in Micro-Raman spectroscopy for a quick and reliable identification of serpentine minerals from ultramafics > European Journal of Mineralogy

Published: 01 May 2006

Fig. 4. Micro-Raman spectra of bastite antigorite ( A ), bastite lizardite ( B ), mesh lizardite ( C ), and matrix antigorite ( D ).

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EMP COMPOSITIONS OF OLIVINE-MESH SERPENTINE AND ORTHOPYROXENE-<span class="search-highlight">BASTITE</span> SERPE...

EMP COMPOSITIONS OF OLIVINE-MESH SERPENTINE AND ORTHOPYROXENE-BASTITE SERPE...

in Serpentinization at the Rainbow and Saldanha sites, Mid-Atlantic Ridge: Mineralogical, geochemical, and isotopic features > The Canadian Mineralogist

Published: 30 September 2019

TABLE 6. EMP COMPOSITIONS OF OLIVINE-MESH SERPENTINE AND ORTHOPYROXENE-BASTITE SERPENTINE PAIRS USED FOR MASS-BALANCE CALCULATIONS

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Photomicrographs under cross-polarized light. a , <span class="search-highlight">Bastite</span> texture after py...

Photomicrographs under cross-polarized light. a , Bastite texture after py...

in Multiple Stages of Carbonation and Element Redistribution during Formation of Ultramafic-Hosted Magnesite in Neoproterozoic Ophiolites of the Arabian-Nubian Shield, Egypt > The Journal of Geology

Published: 01 January 2019

Figure 4. Photomicrographs under cross-polarized light. a , Bastite texture after pyroxene. b , Mesh texture after olivine. c , Fresh relics of olivine. d , Fresh relicts of pyroxene. e , Chrysotile-filled vein crosscutting antigorite matrix. f , Brown, microcrystalline, quartz-filled vein

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Typical (a) ‘mesh’ and (b) ‘<span class="search-highlight">bastite</span>’ texture of NCIR serpentinite.

Typical (a) ‘mesh’ and (b) ‘bastite’ texture of NCIR serpentinite.

in Mineral Chemistry and Alteration Characteristics of Spinel in Serpentinised Peridotites from the Northern Central Indian Ridge > Journal of the Geological Society of India

Published: 01 July 2015

Fig.2. Typical (a) ‘mesh’ and (b) ‘bastite’ texture of NCIR serpentinite.

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(a) Late carbonate veins postdate the ‘bastite’, (b) BSE image and (c) ...

in Mineral Chemistry and Alteration Characteristics of Spinel in Serpentinised Peridotites from the Northern Central Indian Ridge > Journal of the Geological Society of India

Published: 01 July 2015

Fig.4. (a) Late carbonate veins postdate the ‘bastite’, (b) BSE image and (c) X-ray mapping for C of carbonate vein

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BSE images of: ( a ) partially-hydrated bastite (up to millimetric), with p...

in Exsolution and hydration of pyroxenes from partially serpentinized harzburgites > Mineralogical Magazine

Published: 01 August 2005

F ig . 1. BSE images of: ( a ) partially-hydrated bastite (up to millimetric), with preserved opx core, surrounded by serpentine (serp). Arrows indicate inclusions and exsolved cpx. ( b ) Euhedral, elongated and bleb-like inclusions of cpx within opx-M, often surrounded by a thin rim

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(a) Contact relationship between gabbroic rocks and ultramafic rocks. (b) G...

in Late Ordovician fore-arc ophiolitic mélange in the southern margin of the Bainaimiao arc: constraints from zircon U–Pb–Hf isotopes and geochemical analyses > Geological Magazine

Published: 02 August 2021

Fig. 2. (a) Contact relationship between gabbroic rocks and ultramafic rocks. (b) Gabbroic rock. (c) Serpentinized harzburgite. (d) Bastites with orthopyroxene pseudomorphs in a serpentinized peridotite. Abbreviations: Pl – plagioclase; Hb – hornblende; Opx – orthopyroxene; Serp – serpentine; Bas

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Equal-area stereographic projections. (A) Kamb (1959) contour of fold hin...

in Cretaceous-Paleogene thrust emplacement of serpentinite in southwestern Puerto Rico > GSA Bulletin

Published: 01 July 2012

Figure 4. Equal-area stereographic projections. (A) Kamb (1959) contour of fold hinges of folded foliations in serpentinite. (B) Kamb contour of poles to axial planes. (C) Bastite foliations relict from peridotite. (D) Bastite lineations relict from peridotite in Punta Guanajibo.

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Photos showing mesoscale serpentinite structures. (A) L-tectonite defined b...

in Cretaceous-Paleogene thrust emplacement of serpentinite in southwestern Puerto Rico > GSA Bulletin

Published: 01 July 2012

Figure 3. Photos showing mesoscale serpentinite structures. (A) L-tectonite defined by elongated bastites. (B) Bastite layering. (C) Core-and-rim pattern. (D) Serpentine foliation. (E) Breccia and fault plane. (F) Folded serpentine foliation. (G) Matrix-supported conglomerate of serpentinite

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(a) Thin section of sample A1*. (b) PPL (Plane Polarized Light) image of a ...

in Successive phases of serpentinization and carbonation recorded in the Sivas ophiolite (Turkey), from oceanic crust accretion to post-obduction alteration > Bulletin de la Société Géologique de France

Published: 12 August 2022

Fig. 4 (a) Thin section of sample A1*. (b) PPL (Plane Polarized Light) image of a serpentine vein with magnetite grains. (c) Magnified view of a bastite. (d) SEM image of the mesh texture. (e) Magnified image of the mesh texture and (f) associated Fe kα map. (g) Raman spectra of chrysotile

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Photomicrographs of meta-ultramafic rocks. Sample locations are shown in F...

in Ophiolite gabbro from source to sink: A record of tectonic and surface processes in Central Anatolia > Geosphere

Published: 09 August 2017

Figure 8. Photomicrographs of meta-ultramafic rocks. Sample locations are shown in Figures 3 and 6 . (A) Ultramafic rock from the Ecemiş area (ND14-07B) showing incipient mesh-textured serpentinization of olivine (Ol) and bastite textured serpentinization of orthopyroxene (Opx); (B) bastite

Journal Article

Fe-rich antigorite: a rock-forming mineral from low-temperature/high-pressure meta-ophicarbonates

Simonpietro Di Pierro, Chiara Groppo, Roberto Compagnoni, Giancarlo Capitani, Marcello Mellini

Journal: European Journal of Mineralogy

Publisher: GeoScienceWorld Journals

Published: 01 July 2019

European Journal of Mineralogy (2019) 31 (4): 775–784.

DOI: https://doi.org/10.1127/ejm/2019/0031-2867

... and bastite microstructures, and it is locally associated with relics of lizardite and/or chrysotile. The modulated lattice parameters of disordered Fe-rich antigorites have been determined by electron diffraction in the transmission electron microscope. The values are highly variable, even within each...

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Journal Article

Chlorine in the Elba, Monti Livornesi and Murlo serpentines : evidence for sea-water interaction

Barbara ANSELMI, Marcello MELLINI, Cecilia VITI

Journal: European Journal of Mineralogy

Publisher: GeoScienceWorld Journals

Published: 01 January 2000

European Journal of Mineralogy (2000) 12 (1): 137–146.

DOI: https://doi.org/10.1127/0935-1221/2000/0012-0137

... textures and bastites characterize the Elba, Monti Livornesi and Murlo (Central Italy) retrograde serpentinites. These rocks, formed by hydration of harzburgitic peridotites, were sampled and analyzed to find further evidence for the origin of serpentinization fluids. Based on chemical and mineralogical...

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Polarized light images (crossed nicols) of Mg amphibole-bearing samples. ( ...

in Retrograde hydration sequence in disordered Mg amphiboles: A TEM investigation > American Mineralogist

Published: 01 January 2010

F igure 2. Polarized light images (crossed nicols) of Mg amphibole-bearing samples. ( a ) Magnesian amphibole (pale yellow) replacing serpentine in bastitic lamellae; cleavage planes within bastites are inherited from peridotitic pyroxene. ( b ) Acicular Mg amphibole ([001] Mg-Am as elongation

Journal Article

Petrology and Geochemistry of the Neoproterozoic Tays Serpentinite, Arabian Shield: Insights into the Composition and Nature of Forearc Mantle

Bassam A. Abuamarah, Mokhles K. Azer, Paul D. Asimow

Journal: The Journal of Geology

Publisher: The University of Chicago Press

Published: 01 July 2023

The Journal of Geology (2023) 131 (4): 289–311.

DOI: https://doi.org/10.1086/730815

... and alteration to talc-carbonate, magnesite, and listvenite. The ultramafic mantle sequence contains Fe-rich garnierite, the first report of this phase in Arabian Shield serpentinite; it is attributed to Mg-Ni cation exchange during serpentinization. The abundance of bastite and mesh textures in Tays...

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SEM-EDS average compositions (wt.%) of serpentine pseudomorphs (rim, core, ...

in Oriented, non-topotactic olivine → serpentine replacement in mesh-textured, serpentinized peridotites > European Journal of Mineralogy

Published: 01 September 2004

Table 2. SEM-EDS average compositions (wt.%) of serpentine pseudomorphs (rim, core, bastite), relic olivine, ortho- and clinopyroxenes in partially serpentinized harzburgites.

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Electron microprobe analysis of serpentine after olivine and serpentine-chl...

in Experimental constraints on fluid-rock reactions during incipient serpentinization of harzburgite > American Mineralogist

Published: 01 April 2015

Figure 9 Electron microprobe analysis of serpentine after olivine and serpentine-chlorite intergrowths after orthopyroxne in different rock textures and domains. The terms “bastite” and “mesh” refer to pseudomorphic replacement textures after orthopyroxene and olivine, respectively.

Journal Article

Exsolution and hydration of pyroxenes from partially serpentinized harzburgites

C. Viti, M. Mellini, C. Rumori

Journal: Mineralogical Magazine

Publisher: Mineralogical Society of Great Britain and Ireland

Published: 01 August 2005

Mineralogical Magazine (2005) 69 (4): 491–507.

DOI: https://doi.org/10.1180/0026461056940265

...F ig . 1. BSE images of: ( a ) partially-hydrated bastite (up to millimetric), with preserved opx core, surrounded by serpentine (serp). Arrows indicate inclusions and exsolved cpx. ( b ) Euhedral, elongated and bleb-like inclusions of cpx within opx-M, often surrounded by a thin rim...

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