Fillade

Fillade
Categoriaroccia metamorfica
Faciesscisti verdi
Protolitopelitico
Metamorfismoregionale
Minerali principalimica, clorite, quarzo, feldspato
Minerali accessorigranato
Sezioni sottili di fillade
Sezione di fillade vista a un solo polarizzatore
Sezione di fillade vista a un solo polarizzatore
Immagine a nicol paralleli
Sezione di fillade vista a nicol incrociati
Sezione di fillade vista a nicol incrociati
Immagine a nicol incrociati

La fillade è una roccia metamorfica a grana fine, che solitamente si forma da sedimenti pelitici nel corso di metamorfismo regionale di pressione da bassa a moderata e di bassa temperatura.

Tra i componenti essenziali, miche (in forma di sericite) e cloriti sono quelli che le conferiscono la caratteristica lucentezza o la colorazione grigio-verde.

Roccia foliata, può includere piccoli cristalli distinti (porfiroblasti) di granato negli strati ondulati.

La foliazione è dovuta all'allineamento di miche e cloriti in seguito a pressioni medi-basse.

La fillade spesso mostra pieghe di ampiezza ridotta.

Rappresenta uno stadio del metamorfismo tra l'ardesia e i micascisti. È una roccia di basso grado metamorfico simile all'argilloscisto, ma se ne differenzia per l'origine non necessariamente composta da argille molto fini. Inoltre quarzo e feldspati sono presenti nella fillade in quantità maggiori che nelle argilliti.

In Italia affiorano filladi di formazione paleozoica in molte zone del basamento cristallino delle Alpi meridionali, quali le Piccole Dolomiti nel Vicentino, le Dolomiti bellunesi e il Trentino.

Voci correlate

Altri progetti

Collegamenti esterni

  • Le filladi in Sardegna, su progensar.it. URL consultato il 25 novembre 2006 (archiviato dall'url originale l'11 marzo 2007).
  • Le filladi sulle Alpi Apuane, su leonardodavinci.csa.fi.it. URL consultato il 25 novembre 2006 (archiviato dall'url originale il 12 marzo 2007).
  • Dolomiti bellunesi, su dolomitipark.it. URL consultato il 25 novembre 2006 (archiviato dall'url originale l'11 marzo 2007).
Controllo di autoritàGND (DE4295102-1

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