Miocene postorogenic extension of the Eocene synorogenic imbricated Hellenic subduction channel: New constraints from Milos (Cyclades, Greece)

Bernhard Grasemann, Benjamin Huet, David A. Schneider, A. Hugh N. Rice, Nicolas Lemonnier, Cornelius Tschegg

Publications: Contribution to journalArticlePeer Reviewed

Abstract

The island of Milos is part of the South Aegean volcanic arc. The volcanic processes on Milos, which started ca. 3.5 Ma, have been studied in detail, but the limited outcrops of basement rocks have not yet been adequately investigated. We present new structural, petrological, and geochronological data that suggest that the basement rocks on Milos (Kiriaki complex) belong to the Cycladic Blueschist Unit, which underwent blueschist metamorphism at ~8.5 kbar and 400°C. The complex experienced pervasive ductile deformation in the Paleocene-Eocene, with top-to-the-S to -SW shearing. Recalculation of published data from eclogite pebbles that occur as detrital products in "Green Lahars" structurally above the Kiriaki complex yields contrasting metamorphic conditions of ~19.5 kbar at 550° C, suggesting that two nappes, the exposed Lower Cycladic Nappe and eroded relicts of the Upper Cycladic Nappe, exist on Milos. These nappes, which also occur on other Cycladic islands, are separated by the newly defined synorogenic Trans Cycladic thrust. Since Milos is located above the West Cycladic detachment system, the rocks escaped the postorogenic middle- late Miocene low-angled extensional overprint. While rocks in the footwall of the West Cycladic detachment system were experiencing ductile shearing, sediments were being nonconformably deposited on metamorphic rocks of the Kiriaki complex on Milos in the late Miocene. Most importantly, the postoro- genic West Cycladic detachment system did not reactivate but instead crosscut synorogenic structures such as the Trans Cycladic thrust, which bends 90° at Milos, exhibiting a change from W-E- to N-S-trending stretching lineations.

Original languageEnglish
Pages (from-to)238-262
Number of pages25
JournalGeological Society of America. Bulletin
Volume130
Issue number1-2
DOIs
Publication statusPublished - 1 Jan 2018

Austrian Fields of Science 2012

  • 105124 Tectonics

Keywords

  • HIGH-PRESSURE ROCKS
  • METAMORPHIC CORE COMPLEX
  • ISLAND AEGEAN SEA
  • BACK-ARC EXTENSION
  • BLUESCHIST BELT
  • TINOS ISLAND
  • SHEAR ZONE
  • GEODYNAMIC IMPLICATIONS
  • STRAIN LOCALIZATION
  • TECTONIC EVOLUTION

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