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Title: Tectonics of the Biga peninsula and implications on Cu-Au porphyry and epithermal Au deposits, northwestern Anatolia, Turkey
Author: Sanchez Schneider, Matias Gonzalo
Awarding Body: University of London
Current Institution: University of London
Date of Award: 2012
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Abstract:
This thesis presents the results of a multidisciplinary investigation into the Cenozoic tectono-stratigraphic evolution and mineralization of the Biga Peninsula, northwestern Turkey. This has involved the mapping and analysis of extensional and strike-slip fault systems and of the associated magmatic and volcanic events with a particular focus on the structural controls on the porphyry Cu-Au deposits and epithermal gold mineralization of the region. Detailed field mapping, structural analyses, core-logging of exploration drill holes together with Ar/Ar geochronology, remote sensing analyses and aeromagnetic interpretations were undertaken and integrated to develop new tectono- stratigraphic and magmatic models for the Cenozoic structural evolution and mineralization of the Biga Peninsula. The Biga Peninsula is characterised by the NE-trending Kazdag Massif formed by late Hercinian high grade gneiss and amphibolite metamorphic basement. During the latest Oligocene, re-crystallization and granitoids plutonism (26 - 25 Ma) was followed by metamorphic core complex detachment fault systems. The pre-Cenozoic hanging wall of the Kazdag Massif is composed by Permo- Trassic metasediments (Karakaya Complex) and by Late Cretaceous ophiolites (Cetrni Melange). These are flanked by Oligo-Miocene extensional volcano- sedimentary basins internally deformed by domino-style -NE trending hanging wall extensional faults. Porphyry style Cu-Au mineralization is associated with the granitoid intrusions in the footwall of the detachment fault system. High sulfidation style epithermal Au deposits are found in the hanging wall basins above the core complex detachment fault system. Gold in these major strata- bound silicified lithocaps is controlled by the steep hanging wall extensional faults and associated fracture architectures. The Biga peninsula sits within a system of back-arc extensional basins caused by slab roll-back during the Eocene, Oligocene and Miocene. Regional extension followed the closure of the Vardar-Izmir-Ankara Ocean as the Pontides and Anatolides terranes collided in the Late Cretaceous. This research has identified five stages of back-arc extension with magmatism and volcanic activity associated with magmatic-hydrothermal ore systems. The Middle Eocene and Latest Oligocene magmatic arcs of the Biga Peninsula produced porphyry type and epithermal style mineralization as part of a major NW-SE to E-W arc-shaped magmatic-metallogenic zone running from the Dinarides and the Rhodopes to the Pontides of northwestern Turkey. Since the Early Pliocene, the westward propagation of the North Anatolian Fault generated dextral transtension and new strike-slip fault systems together with increased extension on pre-existing extensional fault systems.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.553848  DOI: Not available
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