The Biga Peninsula in northwestern Anatolia is a tectonic mosaic comprised of different tectonic ... more The Biga Peninsula in northwestern Anatolia is a tectonic mosaic comprised of different tectonic units which represented by continental and oceanic assemblages in different origin and ages. High-degree metamorphic rocks occur in the both Çamli ca metamorphics and Çetmi Group. HP eclogite/blueschists are associated with quartz-mica schist within the Çamli ca metamorphics. On the other hand, another HP eclogite/blueschist unit is associated with garnet-mica schist in the Çetmi Group. The host Çamli ca metamorphic rocks record only a single - stage greenschist - facies metamorphism and were juxtaposed with the high - grade metamorphic rocks along ductile - semi-brittle (?) strike - slip faults after the high degree metamorphism and during or after the low-grade metamorphism of the Çamli ca metamorphic unit. Major, trace and rare earth elements (REE) compositions of HP eclogite/blueschist and associated metasedimentary rocks from the Biga Peninsula have been determined to reveal their p...
... North Anatolian Fault Zone. These are the Gulf of izmit and Lake Sapanca to the north and the... more ... North Anatolian Fault Zone. These are the Gulf of izmit and Lake Sapanca to the north and the Gulf of Gemlik and Lake iznik to the south (Figs. 1 and 2). The region lying reserved 156 Y. Ydrnaz et al. Tectonophysics 243 (1995 ...
The Biga Peninsula is the junction including remnants of crustal and oceanic fragments and their ... more The Biga Peninsula is the junction including remnants of crustal and oceanic fragments and their genetic relations are not fully understood yet. The existence of the Intra-Pontide suture and the exhumation history of the metamorphic massifs in the peninsula are the most important problems of the region. In the peninsula, there are different units which crop out under the Cenozoic volcano-sedimentary cover. These are; Kazda˘ g Massif, Çamlıca/Karabiga Massif and Karada˘ g Massif, which is composed different type of metamorphic rocks. Kazda˘ g Massif shows a NE-SW-trending structural high.While unmetamorphosed Mesozoic cover unit of the massif is represented by a carbonate platform succession in the SE of the Kazda˘ g structural high, Cretaceous flysch-like chaotic units (Çetmi Group) is seen in the NW of the Kazda˘ g. The Çetmi Group is the first unmetamorphosed unit overlying directly on the different metamorphic basements in the Biga Peninsula. The Çetmi Group is a depositional seque...
High-pressure metamorphic rocks in Alpine orogenic system are widely common and very important fo... more High-pressure metamorphic rocks in Alpine orogenic system are widely common and very important for representing former subduction zones. Two metabasite slices occur as tectonic slices within the both Çamlica metamorphics and Çetmi melange. The Çamlica metamorphics are mainly composed of the Andiktasi formation consisting of metalava, metatuff and metapelite, the Dedetepe formation with garnet-mica schist, albite-epidote-chlorite schist, calcschist and marble, and the Salihler formation consisting of phyllite-marble intercalation, from bottom to top. The first metabasite slice crops out in the schist-marble intercalation of the Dedetepe formation. A 2 km long and 500 m thick slice is surrounded by quartz-mica schist. The general mineral assemblage of eclogite/blueschist predominantly consists of omphacite + garnet + epidote + quartz + phengite + glaucophane + sphene. The Çetmi mélange is comprised of blocks of pyroclastic rocks, mafic lava, limestone, radiolarite in the greywacke-sha...
ABSTRACT Airborne magnetic anomalies of Biga Peninsula were investigated by using GMinterp softwa... more ABSTRACT Airborne magnetic anomalies of Biga Peninsula were investigated by using GMinterp software which is MATLAB based consisting of a series of linked functions along with a graphical user interface and is developed for data processing and modeling of potential field data. Airborne magnetic data were collected with 1-2 km profile intervals and with about 70 m sampling from 625 m above the ground surface by MTA. The data covers an area of 120 x 180 km and were gridded with 2 km sampling interval. Regional anomaly map was approximated by means of element shape functions used in finite element method and then residuals were computed. In order to determine the lithological changes, boundary analysis technique was performed to residual magnetic anomalies. Firstly magnetic data were transformed to pseudo-gravity data by using 550 and 40 for inclination and declination angles, respectively. Then, the total horizontal derivatives of pseudo-gravity data were estimated by using simple finite difference method. Finally the locations and magnitudes of the maximum horizontal gradients of pseudo-gravity data were determined. Analyzing the resulting maxima map together with the geological map (1/500.000) showed that the locations of maxima indicate the boundaries of plutonic rocks having high magnetization intensity. The results also point out that anomaly separation (regional residual separation) and boundary analysis modules in GMinterp software can be used for this kind of lithologies.
... ERDINC YIGITBAS AND YÜCEL YlLMAZ Department of Geology, Faculty of Mines, Istanbul Technical ... more ... ERDINC YIGITBAS AND YÜCEL YlLMAZ Department of Geology, Faculty of Mines, Istanbul Technical University, 80626 Maslak, Istanbul, Turkey ... de Righi and Cortesini, 1964; Erdogan, 1977; 1982; Perincek and Özkaya, 1981; Sengör and Yilmaz, 1981; Aktas and Robertson ...
The Biga Peninsula in northwestern Anatolia is a tectonic mosaic comprised of different tectonic ... more The Biga Peninsula in northwestern Anatolia is a tectonic mosaic comprised of different tectonic units which represented by continental and oceanic assemblages in different origin and ages. High-degree metamorphic rocks occur in the both Çamli ca metamorphics and Çetmi Group. HP eclogite/blueschists are associated with quartz-mica schist within the Çamli ca metamorphics. On the other hand, another HP eclogite/blueschist unit is associated with garnet-mica schist in the Çetmi Group. The host Çamli ca metamorphic rocks record only a single - stage greenschist - facies metamorphism and were juxtaposed with the high - grade metamorphic rocks along ductile - semi-brittle (?) strike - slip faults after the high degree metamorphism and during or after the low-grade metamorphism of the Çamli ca metamorphic unit. Major, trace and rare earth elements (REE) compositions of HP eclogite/blueschist and associated metasedimentary rocks from the Biga Peninsula have been determined to reveal their p...
... North Anatolian Fault Zone. These are the Gulf of izmit and Lake Sapanca to the north and the... more ... North Anatolian Fault Zone. These are the Gulf of izmit and Lake Sapanca to the north and the Gulf of Gemlik and Lake iznik to the south (Figs. 1 and 2). The region lying reserved 156 Y. Ydrnaz et al. Tectonophysics 243 (1995 ...
The Biga Peninsula is the junction including remnants of crustal and oceanic fragments and their ... more The Biga Peninsula is the junction including remnants of crustal and oceanic fragments and their genetic relations are not fully understood yet. The existence of the Intra-Pontide suture and the exhumation history of the metamorphic massifs in the peninsula are the most important problems of the region. In the peninsula, there are different units which crop out under the Cenozoic volcano-sedimentary cover. These are; Kazda˘ g Massif, Çamlıca/Karabiga Massif and Karada˘ g Massif, which is composed different type of metamorphic rocks. Kazda˘ g Massif shows a NE-SW-trending structural high.While unmetamorphosed Mesozoic cover unit of the massif is represented by a carbonate platform succession in the SE of the Kazda˘ g structural high, Cretaceous flysch-like chaotic units (Çetmi Group) is seen in the NW of the Kazda˘ g. The Çetmi Group is the first unmetamorphosed unit overlying directly on the different metamorphic basements in the Biga Peninsula. The Çetmi Group is a depositional seque...
High-pressure metamorphic rocks in Alpine orogenic system are widely common and very important fo... more High-pressure metamorphic rocks in Alpine orogenic system are widely common and very important for representing former subduction zones. Two metabasite slices occur as tectonic slices within the both Çamlica metamorphics and Çetmi melange. The Çamlica metamorphics are mainly composed of the Andiktasi formation consisting of metalava, metatuff and metapelite, the Dedetepe formation with garnet-mica schist, albite-epidote-chlorite schist, calcschist and marble, and the Salihler formation consisting of phyllite-marble intercalation, from bottom to top. The first metabasite slice crops out in the schist-marble intercalation of the Dedetepe formation. A 2 km long and 500 m thick slice is surrounded by quartz-mica schist. The general mineral assemblage of eclogite/blueschist predominantly consists of omphacite + garnet + epidote + quartz + phengite + glaucophane + sphene. The Çetmi mélange is comprised of blocks of pyroclastic rocks, mafic lava, limestone, radiolarite in the greywacke-sha...
ABSTRACT Airborne magnetic anomalies of Biga Peninsula were investigated by using GMinterp softwa... more ABSTRACT Airborne magnetic anomalies of Biga Peninsula were investigated by using GMinterp software which is MATLAB based consisting of a series of linked functions along with a graphical user interface and is developed for data processing and modeling of potential field data. Airborne magnetic data were collected with 1-2 km profile intervals and with about 70 m sampling from 625 m above the ground surface by MTA. The data covers an area of 120 x 180 km and were gridded with 2 km sampling interval. Regional anomaly map was approximated by means of element shape functions used in finite element method and then residuals were computed. In order to determine the lithological changes, boundary analysis technique was performed to residual magnetic anomalies. Firstly magnetic data were transformed to pseudo-gravity data by using 550 and 40 for inclination and declination angles, respectively. Then, the total horizontal derivatives of pseudo-gravity data were estimated by using simple finite difference method. Finally the locations and magnitudes of the maximum horizontal gradients of pseudo-gravity data were determined. Analyzing the resulting maxima map together with the geological map (1/500.000) showed that the locations of maxima indicate the boundaries of plutonic rocks having high magnetization intensity. The results also point out that anomaly separation (regional residual separation) and boundary analysis modules in GMinterp software can be used for this kind of lithologies.
... ERDINC YIGITBAS AND YÜCEL YlLMAZ Department of Geology, Faculty of Mines, Istanbul Technical ... more ... ERDINC YIGITBAS AND YÜCEL YlLMAZ Department of Geology, Faculty of Mines, Istanbul Technical University, 80626 Maslak, Istanbul, Turkey ... de Righi and Cortesini, 1964; Erdogan, 1977; 1982; Perincek and Özkaya, 1981; Sengör and Yilmaz, 1981; Aktas and Robertson ...
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