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Microstructural, compositional and petrophysical properties of mylonitic granodiorites from an extensional shear zone (Rhodope Core complex, Greece)

Published online by Cambridge University Press:  24 February 2014

ROSALDA PUNTURO ,
ROSOLINO CIRRINCIONE ,
EUGENIO FAZIO ,
PATRIZIA FIANNACCA ,
HARTMUT KERN ,
KURT MENGEL ,
GAETANO ORTOLANO  and
ANTONINO PEZZINO
ROSALDA PUNTURO*
Affiliation:
Università degli Studi di Catania, Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Corso Italia 57, I-95129 Catania (Italy)
ROSOLINO CIRRINCIONE
Affiliation:
Università degli Studi di Catania, Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Corso Italia 57, I-95129 Catania (Italy)
EUGENIO FAZIO
Affiliation:
Università degli Studi di Catania, Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Corso Italia 57, I-95129 Catania (Italy)
PATRIZIA FIANNACCA
Affiliation:
Università degli Studi di Catania, Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Corso Italia 57, I-95129 Catania (Italy)
HARTMUT KERN
Affiliation:
CAU Universität, Institut für Geowissenschaften, Olshausenstr. 40, D-24098 Kiel (Germany)
KURT MENGEL
Affiliation:
Technische Universität Clausthal, Institut für Endlagerforschung, Adolph-Roemer-Str. 2a, D-38678 Clausthal-Zellerfeld (Germany)
GAETANO ORTOLANO
Affiliation:
Università degli Studi di Catania, Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Corso Italia 57, I-95129 Catania (Italy)
ANTONINO PEZZINO
Affiliation:
Università degli Studi di Catania, Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Corso Italia 57, I-95129 Catania (Italy)
*
†Author for correspondence: [email protected]
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Abstract

At the southern boundary of the Rhodope Massif, NE Greece, the Kavala Shear Zone (KSZ) represents an example of the Eastern Mediterranean deep-seated extensional tectonic setting. During Miocene time, extensional deformation favoured syntectonic emplacement and subsequent exhumation of plutonic bodies. This paper deals with the strain-related changes in macroscopic, geochemical and microstructural properties of the lithotypes collected along the KSZ, comprising granitoids from the pluton, aplitic dykes and host rock gneisses. Moreover, we investigated the evolution of seismic anisotropy on a suite of granitoid mylonites as a result of progressive strain. Isotropic compressional and shear wave velocities (Vp, Vs) and densities calculated from modal proportions and single-crystal elastic properties at given pressure–temperature (P–T) conditions are compared to respective experimental data including the directional dependence (anisotropy) of wave velocities. Compared to the calculated isotropic velocities, which are similar for all of the investigated mylonites (average values: Vp ~ 5.87 km s−1, Vs ~ 3.4 km s−1, Vp/Vs = 1.73 and density = 2.65 g cm−3), the seismic measurements give evidence for marked P-wave velocity anisotropy up to 6.92% (at 400 MPa) in the most deformed rock due to marked microstructural changes with progressive strain, as highlighted by the alignment of mica, chlorite minerals and quartz ribbons. The highest P- and S-wave velocities are parallel to the foliation plane and lowest normal to the foliation plane. Importantly, Vp remains constant within the foliation with progressive strain, but decreases normal to foliation. The potential of the observed seismic anisotropy of the KSZ mylonites with respect to detectable seismic reflections is briefly discussed.

Keywords

mylonitic granitoidpetrofabricseismic anisotropysouthern Rhodope Massif
Type
Original Articles
Information
Geological Magazine , Volume 151 , Issue 6 , November 2014 , pp. 1051 - 1071
Copyright
Copyright © Cambridge University Press 2014 

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