2024-03-28T20:32:55Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/184432019-02-27T11:20:30Zcom_10261_91com_10261_8col_10261_344
Highly ordered antigorite from Cerro del Almirez HP–HT serpentinites, SE Spain
Padrón-Navarta, J. A.
López Sánchez-Vizcaíno, V.
Garrido Marín, Carlos
Gómez-Pugnaire, M. T.
Jabaloy, Antonio
Capitani, Giancarlo
Mellini, Marcello
10 pages, 8 figures, 3 tables.
The 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.
2009-11-10T12:14:31Z
2009-11-10T12:14:31Z
2008-11
artículo
Contributions to Mineralogy and Petrology 156(5): 679-688 (2008)
0010-7999x
http://hdl.handle.net/10261/18443
10.1007/s00410-008-0309-x
1432-0967
eng
http://dx.doi.org/10.1007/s00410-008-0309-x
closedAccess
Springer