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Fault rocks within the blueschist metabasalts of the Diamante–Terranova unit (southern Italy): potential fossil record of intermediate-depth subduction earthquakes

Published online by Cambridge University Press:  18 March 2019

Stefano Vitale Open the ORCID record for Stefano Vitale [Opens in a new window] ,
Lorenzo Fedele ,
Francesco D’Assisi Tramparulo  and
Ernesto Paolo Prinzi
Stefano Vitale*
Affiliation:
Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse (DiSTAR), Università degli Studi di Napoli Federico II, Via Cupa Nuova Cintia 21, 80126 Napoli, Italy
Lorenzo Fedele
Affiliation:
Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse (DiSTAR), Università degli Studi di Napoli Federico II, Via Cupa Nuova Cintia 21, 80126 Napoli, Italy
Francesco D’Assisi Tramparulo
Affiliation:
Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse (DiSTAR), Università degli Studi di Napoli Federico II, Via Cupa Nuova Cintia 21, 80126 Napoli, Italy
Ernesto Paolo Prinzi
Affiliation:
Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse (DiSTAR), Università degli Studi di Napoli Federico II, Via Cupa Nuova Cintia 21, 80126 Napoli, Italy
*
Email: stefano.vitale@unina.it
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Abstract

We report the first evidence of fault rocks (FRs) developed during high-pressure/low-temperature (HP/LT) subduction-related metamorphism, within quartz+epidote pods embedded in the glaucophane–lawsonite-bearing ophiolitic metabasalts of the Diamante–Terranova unit (Calabria, Italy). FRs occur as relic injections appearing as thin dark seams, locally showing an internal foliation characterized by tabular, curvilinear and meander-like shapes, and consist of very fine grains of glaucophane and titanite, locally including survivor clasts of epidote and lawsonite. Some boudinaged veins show glaucophane fibres in the boudin necks, marking a clear HP/LT syn-metamorphic origin at c. 30 km depth. The injected FRs can be alternatively interpreted either as pseudotachylytes or as fluidized ultracataclasites. Although subsequent recrystallization largely obliterated primary diagnostic features, the occurrence of (i) different-coloured flow streaks, characterized by alternating layers of glaucophane and titanite, (ii) well-developed flow folds and (iii) corroded epidote survivor crystals could indicate a viscous flow of molten material characterized by a non-uniform chemical composition. With this in mind, we support the hypothesis that these fine-grained veins were originally pseudotachylytes generated by the frictional melting of the glaucophane-rich layers of the Diamante–Terranova metabasalts, likely related to seismic events occurring during the Eocene along thrust faults within the subducting oceanic Ligurian lithosphere. The lack of evidence for pseudotachylyte relics in the metabasalt source rock argues for a selective preservation, largely dependent on the efficient mechanical shielding action of the stiffer quartz+epidote pods.

Keywords

fault rocksHP/LT metamorphismpalaeoseismicitypseudotachylytesouthern Apennines – Calabria – Peloritani Terraneultracataclasite
Type
Original Article
Information
Geological Magazine , Volume 156 , Issue 10 , October 2019 , pp. 1771 - 1782
Copyright
© Cambridge University Press 2019 

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