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Author: Mark Keiter Publisher: Geological Society of America ISBN: 0813724813 Category : Science Languages : en Pages : 52
Book Description
The Island of Syros (Cyclades, Greece) is a prime locality for the study of processes active in deep levels of orogens and is world famous for its exceptionally well preserved blueschist- to eclogite-facies lithologies. Syros Island was completely remapped at a scale of 1:25,000. Detailed lithostratigraphical observations and area-wide, closely spaced structural measurements allowed a much more detailed depiction of the highly variable lithological assemblage, as well as of the complex structural evolution. Lithostratigraphical indications, such as the distribution of Mn-mineralization and sequential repetition of characteristic marker successions, suggest that the whole-rock pile of the Cycladic Blueschist Unit on Syros, including meta-ophiolites and metasediments, retains numerous primary depositional features. Magmatic activity in an Upper Cretaceous backarc environment was likely to be contemporaneous with the deposition of the sedimentary protoliths comprising the main lithological succession on Syros. The structural evolution of the Cycladic Blueschist Unit on Syros comprises multiphase isoclinal intrafolial folding and ductile thrusting, regarded as essentially burial related and terminating close to peak metamorphic conditions, either prograde or very early on the retrograde path. Especially in areas where blueschist- to eclogite-facies metamorphism is undisturbed, high-pressure fabrics are well preserved. The retrograde evolution was accompanied by heterogeneously distributed, weakly developed extensional tectonics and episodical, contractional deformation, followed by intense brittle transpressional and transtensional tectonics, disrupting the rock sequence since Miocene to subrecent times.
Author: Mark Keiter Publisher: Geological Society of America ISBN: 0813724813 Category : Science Languages : en Pages : 52
Book Description
The Island of Syros (Cyclades, Greece) is a prime locality for the study of processes active in deep levels of orogens and is world famous for its exceptionally well preserved blueschist- to eclogite-facies lithologies. Syros Island was completely remapped at a scale of 1:25,000. Detailed lithostratigraphical observations and area-wide, closely spaced structural measurements allowed a much more detailed depiction of the highly variable lithological assemblage, as well as of the complex structural evolution. Lithostratigraphical indications, such as the distribution of Mn-mineralization and sequential repetition of characteristic marker successions, suggest that the whole-rock pile of the Cycladic Blueschist Unit on Syros, including meta-ophiolites and metasediments, retains numerous primary depositional features. Magmatic activity in an Upper Cretaceous backarc environment was likely to be contemporaneous with the deposition of the sedimentary protoliths comprising the main lithological succession on Syros. The structural evolution of the Cycladic Blueschist Unit on Syros comprises multiphase isoclinal intrafolial folding and ductile thrusting, regarded as essentially burial related and terminating close to peak metamorphic conditions, either prograde or very early on the retrograde path. Especially in areas where blueschist- to eclogite-facies metamorphism is undisturbed, high-pressure fabrics are well preserved. The retrograde evolution was accompanied by heterogeneously distributed, weakly developed extensional tectonics and episodical, contractional deformation, followed by intense brittle transpressional and transtensional tectonics, disrupting the rock sequence since Miocene to subrecent times.
Author: Soumyajit Mukherjee Publisher: John Wiley & Sons ISBN: 1118844947 Category : Science Languages : en Pages : 320
Book Description
The elucidation of the mechanisms and kinematics of shear zone deformation, at both local and regional scales, is the subject of a great deal of interest to scientists in the hydrocarbon industry, in seismology, and in structural geology more generally. This book comprises a collection of five theoretical and twelve regional contributions to the subject from a number of leading researchers in the field, with particular emphasis on work carried out in the Indian subcontinent. The book will be invaluable to advances students and researchers involved in the kinematics of shear.
Author: Conall Mac Niocaill Publisher: Geological Society of London ISBN: 9781862390515 Category : Science Languages : en Pages : 358
Book Description
Brings together a series of papers which explore various aspects of the deformation of continental lithosphere, covering different tectonic settings from the Palaeozoic to the present day. These include terrane accretion and juxtaposition, the exhumation of high-pressure terrains, and mechanisms of crustal extension and rifting.
Author: Klaus Gessner Publisher: Geological Society of America ISBN: 081370023X Category : Science Languages : en Pages : 60
Book Description
In this field-trip guide we explore the tectonics of Samos and the Menderes Massif, two fascinating areas within the eastern Mediterranean section of the Tethyan orogen. We include detailed outcrop descriptions, maps, and diagrams to explore along-strike variations in the Hellenide-Anatolide orogen, including the architecture of the Early Tertiary Alpine nappe stack and its strong Miocene extensional overprint. The suggested itinerary is based on the 2010 Geological Society of America Field Forum "Significance of Along-Strike Variations for the 3-D Architecture of Orogens: The Hellenides and Anatolides in the Eastern Mediterranean." We start the outcrop descriptions with Day 1 in Samos, where, untypically for the N-S-stretched Aegean region, Miocene extension is E-W. We describe a section in western Samos, where the Cycladic Blueschist Unit is in contact with the underlying External Hellenides along a large-scale thrust, reactivated as a Miocene top-east extensional shear zone. The focus of Day 2 is on high-pressure assemblages in northern Samos. The following three days explore the Anatolide Belt in western Turkey where the Menderes nappes-also known as the Menderes Massif-form the tectonic footwall below the Cycladic Blueschist Unit. The outcrops in western Anatolia include the Cycladic Blueschist Unit in the area around Selcuk (Day 3) and sections across the Bozdaĝ and Aydin Mountains including the Kuzey and Güney detachment faults and the Cycladic Menderes Thrust (Days 4 and 5). Outcrops on Day 6 showcase structures along the southern margin of the Menderes Massif in the Milas-Selimiye area.
Author: M. Fytikas Publisher: Elsevier ISBN: 0080457576 Category : Science Languages : en Pages : 401
Book Description
This book is a collection of 22 selected papers from the homonymous Conference held in September 2003 Milos, Greece. The aim of the conference was to serve as a forum for the presentation and constructive discussion of the state-of-the-art and emerging issues on the South Aegean Volcanic Arc. In the first part of the book the tectonic- geodynamic setting and the present upper mantle structure of the Aegean area are discussed. It includes an interesting interpretation of data on the spatial distribution of intermediate focal depth earthquakes, fault plane solutions and deep velocity structures, to further investigate active tectonics related to the deep structure of the southern Aegean volcanic arc. The second part deals with general volcanological, petrological and tectonic characteristics of the SAAVA presenting an extensive review of volcanological, chemical, isotope and tectonic data, using a large amount of new field and laboratory data. Interesting conclusions are presented regarding the present volcanic associations, the volcanic fields location and shape in respect to the large tectonic lineaments and the plate motions, the source of the SAAVA parental magmas. Presented in the third part is an extensive review on the volcanic hazard assessment and the monitoring state of the SAAVA centers. Seismic and geodetic monitoring of the Santorini volcano and the recent (1995-1998) crisis of Nisyros volcano are presented and discussed. The last part deals with hydrothermal deposits and processes in the SAAVA, as well as products and processes in adjacent areas with a particular interest and significance that link them to the SAAVA processes.*Systematic re-evaluation on the geodynamic and tectonic setting of the Aegean active volcanic centers *Thorough review with new data and ideas on the magma source region, the magma differentiation processes in both the deep and shallow levels, and the volcanological processes related both to the magma composition and storage depth as well as to the tectonic regime of the volcano growth area*Up to date estimation of the volcanic hazard in the Aegean area, and a detailed presentation of the present state and the monitoring efforts of the South Aegean active centers
Author: Mark Keiter
Author: Mark Keiter
Author: Soumyajit Mukherjee
Author: Tuncay Taymaz
Author: Conall Mac Niocaill
Author: 
Author: Klaus Gessner
Author: Paul Aaldert Maar
Author: Uwe Ring
Author: M. Fytikas
Author: Stanley Hay Umphray Bowie