Collision and Collapse at the Africa-arabia-eurasia by D. J. J. Van Hinsbergen

By D. J. J. Van Hinsbergen

The Mediterranean and northern Arabian areas supply a distinct traditional laboratory to constrain geodynamics linked to arc-continent and continent-continent collision and next orogenic cave in via analysing nearby and temporal distributions of many of the components within the geological archive. This publication combines 13 new contributions that spotlight timing and distribution of the Cretaceous to fresh evolution of the Calabrian, Carpathian, Aegean and Anatolian segments of the Africa-Arabia-Eurasia subduction region. those are subdivided into 5 papers documenting the timing and kinematics of Cretaceous arc-continent collision, and Eocene and Miocene continent-continent collision in Anatolia, with westward extrusion of Anatolia therefore. 8 papers offer an summary and new info from stratigraphy, constitution, metamorphism and magmatism, overlaying the geological outcomes of the mostly Neogene cave in that characterizes the segments of curiosity, based on past due level reorganization of the subduction sector, and the roll-back and break-off of (segments of) the subducting slab.

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Extra info for Collision and Collapse at the Africa-arabia-eurasia Subduction Zone (Geological Society Special Publication)

Sample text

The mineral assemblages constrain peak pressures to c. 24 kbar and temperatures to c. 430 8C (Okay & Kelley 1994). The blueschists pass upwards into thick meta-carbonates (I˙no¨nu¨ Marble) of inferred Middle Triassic to Early Cretaceous age (Okay 1986). The marbles are overlain by meta-basic igneous rocks and meta-shales that include rare chert intercalations (Devlez Formation). These meta-basic rocks are classic blueschists with sodic amphibole, lawsonite and minor sodic pyroxene, chlorite and phengite (Okay 1986).

Outline geological map of the Tavs¸anlı zone in the Sivrihisar area (No. 9). Data from 1:500 000 geological map of Turkey (MTA 2002) and this study. See Figure 5 for location. olistostrome, our observations show that this melange should be re-interpreted as tectonic melange (see Tectonic processes). The Dag˘ku¨plu¨ melange underlies a large sheet of serpentinised hartzburgite, above a regional northdipping thrust (Fig. 16). The size and abundance of blocks within this melange generally increase towards the over-riding ophiolite.

This well-studied area provides a reference for other areas discussed in more detail here. Based on the 1:500 000 geological map of Turkey (MTA 2002) and Okay (1986). See text for discussion. OPHIOLITE EMPLACEMENT IN CENTRAL TURKEY the rocks including basalt, radiolarian chert, pelagic shale, pelagic limestone and serpentinite (Okay & Kelley 1994; Okay et al. 1998). Some lithologies have undergone incipient blueschist facies metamorphism (Okay 1986). g. aragonite, sodic pyroxene and lawsonite) are commonly present in veins and amygdales within basalt.

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