Very low temperature, natural deformation of fine grained limestone: a case study from the Lucania region, southern Apennines, Italy.

S Mazzoli, V. Zampetti, A Zuppetta

    Research output: Contribution to JournalArticleAcademicpeer-review

    Abstract

    The deformation behavior of fine grained limestones from the Monte Sirino area (Lucania region) of the southern Apennines has been analysed by constraining microstructural observations and crystallographic fabrics with data on the metamorphic conditions of deformation. X-ray and infrared analysis of clay minerals, together with illite 'crystallinity' data, suggest that the studied rocks underwent very low grade metamorphism in the deep diagenetic zone. The limestones consist of very fine grained (<10 μm) aggregates of micrite. Elliptically-shaped radiolarians, preserved as moulds with coarser (>20 μm) crystalline fillings, provide common strain markers. Optical microstructures and strain analysis indicate heterogeneous intracrystalline strain in the coarser (>50 μm) calcite. On the other hand, SEM and TEM observations, and crystallographic fabrics determined by X-ray texture goniometry, indicate a deformation involving not only intracrystalline slip, but also an important component of grain boundary sliding in the fine grained matrix. The inferred microscopic deformation mechanisms are compared with constitutive flow laws derived from experimental studies. For the maximum inferred temperature of deformation of 250 °C and geologic strain rates of 10
    Original languageEnglish
    Pages (from-to)213-230
    JournalGeodinamica Acta
    Volume14
    Issue number4
    DOIs
    Publication statusPublished - 2001

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