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Título

Prograde and retrograde diagenetic and metamorphic evolution in metapelitic rocks of Sierra Espuña (Spain).

AutorAbad, Isabel; Nieto, F.; Peacor, D. R.; Velilla, Nicolás
Palabras claveXrd
Illite crystallinity
Electron microscopy
Very low-grade metamorphism
Sudoite
Micas
Fecha de publicaciónmar-2003
EditorMineralogical Society (Great Britain)
CitaciónClay Minerals 38(1): 1-23 (2003)
ResumenAn unusually complete sequence of pelitic rocks ranging from diagenetic to greenschist-facies metamorphic grades occurs in southern Sierra Espuña, Spain. Prograde and retrograde reactions have been studied by X-ray diffraction and electron microscopy (SEM, TEM and AEM). The prograde reaction series, with reactions facilitated by tectonic stress, includes: (1) R4 interstratified illite-smectite in the diagenetic Malaguide Complex that preserves the variable orientation of original smectite packets, and has 1Md polytypism; (2) chemically heterogeneous illite and Na-K dioctahedral white micas that progressively evolve toward chemical and textural equilibrium in the anchizonal Intermediate Units; and (3) thick, defect-free packets of phengite, paragonite and clinochlore which have a typical metamorphic texture, in the Alpujarride Complex. Two superimposed retrograde episodes produced: (a) sudoite at near-peak metamorphic conditions and (b) dioctahedral smectite during low-temperature retrograde diagenesis.
Versión del editorhttp://dx.doi.org/10.1180/0009855033810074
URIhttp://hdl.handle.net/10261/19014
DOI10.1180/0009855033810074
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