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Título

Highly ordered antigorite from Cerro del Almirez HP–HT serpentinites, SE Spain

AutorPadrón-Navarta, J. A.; López Sánchez-Vizcaíno, V.; Garrido, C. J.; Gómez-Pugnaire, M. T.; Jabaloy, Antonio; Capitani, Giancarlo; Mellini, Marcello
Fecha de publicaciónnov-2008
EditorSpringer
CitaciónContributions to Mineralogy and Petrology 156(5): 679-688 (2008)
ResumenThe Cerro del Almirez ultramafic massif offers an example of high pressure and high temperature antigorite serpentinites. A sharp antigorite-out isograd separates them from Chl-harzburgites, consisting of olivine + enstatite + chlorite. Antigorite is characterized by aluminium contents as high as 4 wt.% Al2O3. The microstructural study shows that, prior to the transformation, antigorite is exceptionally ordered and consists of the polysome m = 17. No polysomatic defect occurs in antigorite forming most of the Cerro del Almirez serpentinites. Close to the antigorite-out isograd, limited disorder features may occur, mainly as (001) twins, reaction rims and reduction of m down to 14–15. Here, local recrystallization phenomena lead to sporadic growth of large antigorite and chlorite crystals.
Descripción10 pages, 8 figures, 3 tables.
Versión del editorhttp://dx.doi.org/10.1007/s00410-008-0309-x
URIhttp://hdl.handle.net/10261/18443
DOI10.1007/s00410-008-0309-x
ISSN0010-7999 (Print)
1432-0967 (Online)
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