Journal ArticleDOI
Jadeite–chloritoid–glaucophane–lawsonite blueschists in north-west Turkey: unusually high P/T ratios in continental crust
TLDR
Sodic metapelites with jadeite, chloritoid, glaucophane and lawsonite formed a coherent regional metamorphic sequence, several tens of square kilometres in size, and over a kilometre thick, in the Orhaneli region of northwest Turkey as mentioned in this paper.Abstract:
Sodic metapelites with jadeite, chloritoid, glaucophane and lawsonite form a coherent regional metamorphic sequence, several tens of square kilometres in size, and over a kilometre thick, in the Orhaneli region of northwest Turkey. The low-variance mineral assemblage in the sodic metapelites is quartz + phengite + jadeite + glaucophane + chloritoid + lawsonite. The associated metabasites are characterized by sodic amphibole + lawsonite ± garnet paragenesis. The stable coexistence of jadeite + chloritoid + glaucophane + lawsonite, not reported before, indicates metamorphic pressures of 24 ± 3 kbar and temperatures of 430 ± 30 °C for the peak blueschist facies conditions. These P–T conditions correspond to a geotherm of 5 °C km−1, one of the lowest recorded in continental crustal rocks. The low geotherm, and the known rate of convergence during the Cretaceous subduction suggest low shear stresses at the top of the downgoing continental slab.read more
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Metamorphic Conditions in Orogenic Belts: A Record of Secular Change
TL;DR: The abundance and scale of ultra-high-temperature (UHT) metamorphic belts from the Neoarchean to the Cambrian imply a significant change in geodynamics during the Neo-Archean Era, after which transient sites of high heat flow were available at intervals throughout this period of Earth evolution as mentioned in this paper.
Journal ArticleDOI
Aegean tectonics: Strain localisation, slab tearing and trench retreat
Laurent Jolivet,Claudio Faccenna,Benjamin Huet,Loïc Labrousse,Laetitia Le Pourhiet,Olivier Lacombe,Emmanuel Lecomte,E. Burov,Yoann Denèle,Jean-Pierre Brun,Melody Philippon,Anne Paul,G. Salaün,Hayrullah Karabulut,Claudia Piromallo,Patrick Monié,Frédéric Gueydan,Aral I. Okay,Roland Oberhänsli,Amaury Pourteau,Romain Augier,Leslie Gadenne,Olivier Driussi +22 more
TL;DR: In this paper, the authors review the geodynamic evolution of the Aegean-Anatolia region and discuss strain localisation there over geological times, and they favour a model where slab retreat is the main driving engine, and successive slab tearing episodes are the main causes of this stepwise strain localization and the inherited heterogeneity of the crust is a major factor for localising detachments.
Journal ArticleDOI
Very-low-temperature record of the subduction process: A review of worldwide lawsonite eclogites
TL;DR: Lawsonite eclogites preserve a record of very low-temperature conditions in subduction zones as mentioned in this paper, typically characterized by accretionary complexes lithologies and as tectonic blocks within serpentinite-matrix melange.
Journal ArticleDOI
Tectonic units of the Alpine collision zone between Eastern Alps and western Turkey
Stefan M. Schmid,Bernhard Fügenschuh,Alexandre Kounov,Liviu Maţenco,Peter Nievergelt,Roland Oberhänsli,Jan Pleuger,Senecio Schefer,Ralf Schuster,Bruno Tomljenović,Kamil Ustaszewski,Douwe J.J. van Hinsbergen +11 more
TL;DR: In this article, a map that correlates tectonic units between Alps and western Turkey accompanied by a text providing access to literature data is presented, explaining the concepts used for defining the mapped Tectonic Units, and first-order paleogeographic inferences.
Journal ArticleDOI
Transient, synobduction exhumation of Zagros blueschists inferred from P‐T, deformation, time, and kinematic constraints: Implications for Neotethyan wedge dynamics
Philippe Agard,Patrick Monié,W. Gerber,Jafar Omrani,M. Molinaro,Bertrand Meyer,Loïc Labrousse,B. Vrielynck,Laurent Jolivet,Philippe Yamato +9 more
TL;DR: In this paper, the authors present the first P-T, deformation time, and kinematic constraints on the only known blueschist facies rocks (BS) present in the Zagros (Hajiabad area).
References
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Journal ArticleDOI
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