The quartz-LPO analysis in L-S mylonitic rocks of the Palaeozoic basement that crops out near Giuncana, northern Sardinia, evidenced the role that micas have for the development of quartz-LPO during low-T deformation of polycrystalline quartz-feldspatic rocks. Mylonites developed within the Posada-Asinara right-hand shear zone, from primary quartzites, schists, gneisses and migmatites. In samples of gneisses and schists with mica <18%, quartz-LPO suggests low-T conditions, while high-T LPO patterns exist in two samples exceeding 18% micas. The high-T LPO have been interpreted as relic patterns, survivor of the low-T evolution because of their relatively high content of phyllosilicates, which enable inter-crystalline strain partitioning among quartz and biotite.

The influence of mica for the development of quartz-LPO in quartz-feldspatic aggregates naturally deformed within a shear zone / Casini L; Oggiano G. - In: RENDICONTI DELLA SOCIETÀ GEOLOGICA ITALIANA. - ISSN 0392-3037. - 4:(2007), pp. 191-194.

The influence of mica for the development of quartz-LPO in quartz-feldspatic aggregates naturally deformed within a shear zone

CASINI, Leonardo;OGGIANO, Giacomo
2007

Abstract

The quartz-LPO analysis in L-S mylonitic rocks of the Palaeozoic basement that crops out near Giuncana, northern Sardinia, evidenced the role that micas have for the development of quartz-LPO during low-T deformation of polycrystalline quartz-feldspatic rocks. Mylonites developed within the Posada-Asinara right-hand shear zone, from primary quartzites, schists, gneisses and migmatites. In samples of gneisses and schists with mica <18%, quartz-LPO suggests low-T conditions, while high-T LPO patterns exist in two samples exceeding 18% micas. The high-T LPO have been interpreted as relic patterns, survivor of the low-T evolution because of their relatively high content of phyllosilicates, which enable inter-crystalline strain partitioning among quartz and biotite.
The influence of mica for the development of quartz-LPO in quartz-feldspatic aggregates naturally deformed within a shear zone / Casini L; Oggiano G. - In: RENDICONTI DELLA SOCIETÀ GEOLOGICA ITALIANA. - ISSN 0392-3037. - 4:(2007), pp. 191-194.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11388/59530
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? ND
social impact