Journal ArticleDOI
TEM and FESEM characterization of asbestiform and non-asbestiform actinolite fibers in hydrothermally altered dolerites (France)
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In this paper, the authors provided new mineralogical and morphological characterizations of calcic amphiboles from hydrothermally altered dolerites from France to discuss their potential to contain naturally occurring asbestos (NOA) and to release elongated mineral particles corresponding to asbestos fibers, or asbestos-like fibers, into the air.Abstract:
This paper provides new mineralogical and morphological characterizations of calcic amphiboles from hydrothermally altered dolerites from France to discuss their potential to contain naturally occurring asbestos (NOA) and to release elongated mineral particles corresponding to asbestos fibers, or asbestos-like fibers, into the air. The calcic amphiboles were characterized using electron microprobe analysis, scanning and transmission electron microscopy. The results underline that fibrous occurrences of actinolite and ferro-actinolite regularly occur in hydrothermally altered dolerites, both in the groundmass and in quartz veins. In the groundmass, actinolitic amphiboles crystallize at the expense of magmatic clinopyroxenes and are rarely fibrous. Conversely, actinolite and ferro-actinolite fibers from quartz veins are potentially asbestiform to clearly asbestiform. The identification of quartz veins in hydrothermally altered dolerites is, therefore, an important parameter which should draw attention to the possible presence of asbestiform actinolite fibers. The mineralogical characterization of such veins as well as the estimation of their thickness and density is an important point to consider during studies involving NOA issues. Moreover, the degree of weathering of the dolerites, which directly affects the ability of non-asbestiform actinolite crystals to dissociate into very thin fibers, regarded as cleavage fragments instead of as asbestos, is also a key parameter to consider. Hydrothermally altered dolerites are common rocks likely to be exploited by the quarrying industry to produce aggregates or to be affected by construction works. Due to the abundance of actinolite fibers that they may contain locally, these rocks become priority targets to be monitored in terms of geological characterization and airborne fiber emission to ensure the protection of populations and workers.read more
Citations
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Research on Hyperspectral Identification of Altered Minerals in Yemaquan West Gold Field, Xinjiang
Ziwu Pan,Junjie Liu,Liqun Ma,Fengrui Chen,Guchang Zhu,Fen Qin,Hongliang Zhang,Jinting Huang,Yang Li,Juefan Wang +9 more
TL;DR: In this paper, the results of hyperspectral mineral extraction show that the mineral assemblage closely related to gold deposits in shear zones is muscovite + chlorite + epidote + kaolinite.
Journal ArticleDOI
Coupling SEM-EDS and confocal Raman-in-SEM imaging: A new method for identification and 3D morphology of asbestos-like fibers in a mineral matrix.
TL;DR: It is demonstrated that coupling confocal Raman imaging and SEM is a new and efficient in-situ method for identification and morphological characterization of amphibole fibers.
Journal ArticleDOI
Petrofacies for the prediction of NOA content in rocks: application to the “Gronda di Genova” tunneling project
Serena Botta,Chiara Avataneo,Luca Barale,Luca Barale,Roberto Compagnoni,Roberto Cossio,Igor Marcelli,Fabrizio Piana,Fabrizio Piana,Sergio Tallone,Francesco Turci +10 more
TL;DR: In this article, the authors used the NOA petrofacies approach for the evaluation of asbestos content in a complex meta-ophiolite suite, which will be crossed by the “Gronda di Genova” highway bypass project (Genoa, NW Italy).
Notice explicative carte géologique Maroc (1/50 000), feuille Al Glo'a
A. Souleimani,Emmanuel Egal,Philippe Razin,Nasrrddine Youbi,Hassan Admou,O. Blein,Luc Barbanson,Dominique Gasquet,M. Bouabdelli,Conseil Anzar +9 more
Journal ArticleDOI
Naturally occurring asbestos in an alpine ophiolitic complex (northern Corsica, France)
TL;DR: In this paper, a field description and an analytical characterization of the fibrous minerals associated with ultrabasic and basic rocks from the Corsican Ophiolitic Complex, on the island of Corsica, in order to examine their asbestos potential was provided.
References
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Journal ArticleDOI
Nomenclature of the amphibole supergroup
Frank C. Hawthorne,Roberta Oberti,George E. Harlow,Walter V. Maresch,Robert F. Martin,John C. Schumacher,Mark D. Welch +6 more
TL;DR: In this article, a new classification and nomenclature scheme for the amphibole-supergroup minerals is described, based on the general formula AB 2 C 5 T 8 O 22 W 2.
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An Excel spreadsheet to classify chemical analyses of amphiboles following the IMA 2012 recommendations
TL;DR: A Microsoft Excel spreadsheet has been programmed to assist with classification of chemical analyses of orthorhombic and monoclinic amphiboles following the 2012 nomenclature recommended by the International Mineralogical Association.
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Carcinogenicity of fluoro-edenite, silicon carbide fibres and whiskers, and carbon nanotubes
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Recommended nomenclature of epidote-group minerals
Thomas Armbruster,Paola Bonazzi,Masahide Akasaka,Vladimir Bermanec,Christian Chopin,Reto Gieré,Soraya Heuss-Assbichler,Axel Liebscher,Silvio Menchetti,Yuanming Pan,Marco Pasero +10 more
TL;DR: In this article, the authors proposed a nomenclature for the epidote-group of REE-rich minerals, which is based on the clinozoisite-allanite subgroup.
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The Composition and Morphology of Amphiboles from the Rainy Creek Complex, Near Libby, Montana
Gregory P. Meeker,A.M. Bern,Isabelle K. Brownfield,H. A. Lowers,H. A. Lowers,Steve J. Sutley,Todd M. Hoefen,J.S. Vance +7 more
TL;DR: The amphibole-rich Vermiculite Mountain amphiboles from the Rainy Creek alkaline-ultramafic complex near Libby, Montana were collected and analyzed.