Tectonics and Structure Commons^™

Formation And Tectonic Evolution Of Structural Slices In Eastern Kargı Massif (Çorum, Türkiye), Cihan Yalçin, Nurullah Hani̇lçi̇, Mustafa Kumral, Mustafa Kaya

Bulletin of the Mineral Research and Exploration

The closure of Tethys Ocean has led to shaping the Central Pontides together with different types of rocks. In the east of Kargı (Gökçedoğan), which is located in the Central Pontides, allochthonous rocks of Late Palaeozoic-Early Cenozoic age and autochthonous units exist together, and allochthonous rocks present various tectono-stratigraphical sequences. Distinctive tectonic slices developed in the area as a consequence of the thrusting of the Permian carbonates from the north towards the south over the Middle Jurassic accretionary Complex (Kunduz Metamorphites) that form the basement of the area, and also because of the thrusting of the units of the Kirazbaşı …

Analysis Of The Stress Distribution Of North Anatolian Fault Zone For The Part Between Amasya-Tokat Cities, Ayça Çirmik, Ufuk Aydin, Oya Ankaya Pamukçu, Fikret Doğru

Bulletin of the Mineral Research and Exploration

Tectonic forces formed in the continental crust, cause permanent changes in stress, compression and deformation. The amplitudes of earthquake waves vary with the stress/strain distribution in the crust. In this study, the change of stress / strain and regional absorption coefficient, which is effective in tectonic forces caused by elastic deformation energy accumulating in the brittle crust over time, was investigated. The study area is the middle part of the North Anatolian Fault Zone and the area formed by Ezinepazarı fault zone and Merzifon fault zone. In this area, Coulomb stress analysis was carried out by using the focal mechanism …

Assessment Of Crustal Thinning And Tectonic Stress Distribution Of Gülbahçe Fault Zone And Its Surroundings (İzmir, West Türkiye) Using Gravity And Magnetic Anomalies, Oya Pamukçu, Ayça Çirmik, Fikret Doğru, Ece Ünlü, Barış Can Malali̇çi̇

Bulletin of the Mineral Research and Exploration

Gülbahçe Fault Zone (GFZ) is a significant tectonic structure and seismic source for İzmir city and its surroundings. The major earthquakes occurred at the surroundings of GFZ are 2005 Seferihisar, 2020 Samos Island-Aegean Sea and 2021 Seferihisar earthquakes. In this study, the crustal thinning and tectonic stress distribution of GFZ and its surroundings were analyzed by using the new gravity and magnetic data. The correspondence analysis was applied by appraising together the magnetic and free-air anomaly data. Moreover, the average density of the subsurface structure was calculated by applying the Parasnis method. The deviatoric stress calculation was executed and the …

Uludağ Extensional Metamorphic Core Complex: Preliminary Field Observations, Gürol Seyi̇toğlu, Korhan Esat

Bulletin of the Mineral Research and Exploration

In the northern margin of Uludağ Massif in northwest Anatolia, the Bursa Detachment having topto- the north, northeast normal sense of shear separates the lower plate high-grade metamorphic rocks of Series-A (Uludağ Group) from the upper plate low-grade metamorphic rocks of Series-B (Karakaya Complex). The deeper section of Uludağ Massif is represented by the Oligocene metagranites at the southern parts of the massif that is exposed due to the youngest high-angle Soğukpınar normal fault. The massif is a typical extensional metamorphic core complex similar to the counterparts in the west and northwest Anatolia such as the Menderes, Kazdağ, and Çataldağ …

Some Thoughts On The Morphotectonic Development Of The Denizli Region, Yücel Yilmaz

Bulletin of the Mineral Research and Exploration

The Denizli region is located to the east of the Buldan Horst. Although they follow the same trends as the Büyük Menderes and Gediz grabens, the Denizli region has undergone semi-independent evolution during the Quaternary. The essential morphotectonic elements of the area are the Denizli Basin and the surrounding Babadağ and the Güzelpınar Horsts. The Babadağ Horst is the most distinct morphotectonic element of the region. It is bounded in the north by the Denizli fault, a listric normal fault, and possibly a major detachment fault. The Laodicea and Güzelpınar Horsts located within the downthrown block of the fault may …

Coulomb Stress Changes And Magnitude-Frequency Distribution For Lake Van Region, Hamdi Alkan, Erdem Bayrak

Bulletin of the Mineral Research and Exploration

The tectonic structure of Türkiye is under the influence of Arabian, Eurasian, African, and Anatolian plates. Lake Van region, located in eastern Türkiye, has been exposed to many devastating earthquakes in historical and instrumental periods. In this paper, using regional earthquakes, the tectonic stress variation of Lake Van region was investigated using the Coulomb stress change and the b-value distribution. 83 earthquakes that occurred between 2000 and 2020 are used to calculate the Coulomb stress change, while 17815 earthquakes that occurred between 1903 and 2021 are used to calculate the b-value distribution. Coulomb stress change gives an idea about the …

A Graph Method For Interpretation Of Magnetic Anomalies Over 2d Dikes And Vertical Faults, İbrahim Kara, Oya Tarhan Bal, Anisya B.Tekkeli̇

Bulletin of the Mineral Research and Exploration

Simple geometric assumptions for dikes and faults are often used for interpreting the parameters of these structures from magnetic anomalies. The magnetic anomaly of a 2D dike or a vertical fault consists of two components; one with even and the other with odd symmetries. The function resulting from the ratio of the even and odd components is independent from the amplitude coefficient. The abscissa of the half-maximum of the even component and the maximum of the odd component of a dike or a vertical fault is related to its depth and its half-width. Incorporating this relation into the corresponding equations …

The Relationship Between Seismic Quality Factor And Peak Ground Acceleration, A Case Study: M=4.3, 17.01.2015 Eskişehir Earthquake, Muammer Tün

Bulletin of the Mineral Research and Exploration

Seismic wave propagation in subsurface media endures from absorption, which can be evaluated by the seismic quality factor Q (Q-factor). Absorption is frequency-dependent. Lower frequencies are absorbed less, while higher frequencies are absorbed more. Therefore, the Q Factor should be determined in the frequency domain. Q-factor is determined by the slope of the natural logarithm of the output-input signals ratio. Surface waves (Rayleigh and Love waves) are particularly important, as they are the more destructive phases of an earthquake. This study was, focused on the Q-factor computation of the surface waves and demonstrated that the determination of the Q-factor is …

Active Tectonics Of Gülpınar-Tuzla Area (Biga Peninsula, Nw Turkey): The Source Of 6 February-24 March 2017 Earthquake Cluster, Ali Koçyi̇ği̇t, Şule Gürboğa

Bulletin of the Mineral Research and Exploration

The variation in the motion sense of Anatolian platelet in Aegean Sea resulted in a strike-slip tectonic regime and related neotectonic domain, the central to northern Aegean neotectonic province, which also includes both western Marmara Sea and Biga Peninsula. Our study focuses mostly on the Gülpınar-Tuzla earthquake area located at the southwestern tip of Biga Peninsula,which is controlled by the southern major strand of the North Anatolian Fault System (NAFS). The strand consists of two sections, the onshore Biga and offshore Babakale-Skyros sections. Both sections are seismically very active. The Gülpınar-Tuzla earthquake area is composed of the Paleozoic metamorphic rocks, …

Geological Characteristics Of The Boundary Between Bolkardağı - Bozkır Units And The Ulukışla Basin And The Structural Evolution Of The Region, Central Taurides, Turkey, Tolga Esi̇rtgen, Veysel Işik

Bulletin of the Mineral Research and Exploration

The character of the boundary between the tectonic units in the Central Taurides and the Ulukışla Basin is controversial. The contact has been accepted as discordant or tectonic contact by different researchers. The deformation data of the units in the study area provide important information about the Mesozoic - Cenozoic period geological developments of the region. Regional compression in NW - SE direction has caused the development of fold, foliation and reverse fault type structures in the units in the study area. Similar structural deformations are observed in the rock units defined in the Ulukışla Basin as well. In this …

The Relation Of Seismic Velocity And Attenuation Pattern In The East Anatolian Fault Zone With Earthquake Occurrence: Example Of January 24, 2020 Sivrice Earthquake, Şakir Şahi̇n, Erdinç Öksüm

Bulletin of the Mineral Research and Exploration

The East Anatolian Fault Zone (EAFZ) is one the main tectonic elements of Turkey, which borders the Anatolian plate from the east. EAFZ, which is NE - SW direction, consists of many fault segments. In the historical and instrumental period, many damaging earthquakes occurred, the largest being 6.8 (Ms) as the 1971 Bingöl earthquake. The last magnitude 6.6 (Ml) (Mw=6.8) earthquake occurred on January 24, 2020 in Elazığ-Sivrice Hazar-Sincik segment of EAFZ. However, considering the historical and instrumental activity, it is seen that many fault segments are silent. In this study, the silent and active segments, and their seismic velocity …

Role Of The Cretaceous Normal Faults On The Formation Of The Eocene (Pontide) Fold-Thrust Belt Structures In Offshore Akçakoca-Amasra Area, Western Black Sea Basin, Turkey, Özgür Türkmen, İbrahim Çemen

Bulletin of the Mineral Research and Exploration

The Western Black Sea basin formed during therifting of the Moesian Platform in Early Cretaceous. The closure of the Neotethys Ocean in the Middle Eocene resulted in the formation of the Pontide fold and thrust belt in northern Turkey. During this study, eight seismic reflection profiles were interpreted to determine the subsurface structural geometry and tectono-stratigraphic evolution of the offshore Akçakoca-Amasra area. The stratigraphy of the study area is determined based on a composite wireline well log of the Akçakoca-1 wildcat well, which was also used to construct a velocity model based onsonic data. We suggest that a major décollement …

Estimation Of Co-Seismic Land Deformation Due To Mw 7.3 2017 Earthquake In Iran (12 November 2017) Using Sentinel-1 Dinsar, Fatma Canaslan Çomut, Şule Gürboğa, Tayeb Smail

Bulletin of the Mineral Research and Exploration

A strong shaking with Mw 7.3 occurred on 12th November 2017 around the Sarpol-e Zahab town in the border area between Iran and Iraq. It has a number of foreshocks and aftershocks increasing the total deformation, cumulatively. In this study, we have investigated how earth surface deformed after such a strong earthquake and its scatters. Because, the deformation inspection are indispensable for the safety of citizens and infrastructures. The best way for monitoring of surface deformation in such a big event is the SAR technique. This system can work effectively during night and day under different weather conditions. The Interferometric …

An Overview Of The Current Seismicity Of The Sultandağı Fault Zone (Afyonkarahisar-Konya, Western Anatolia), Doğan Kalafat, Yavuz Güneş, Mehmet Kara, Kıvanç Kekovali

Bulletin of the Mineral Research and Exploration

Western Anatolia is one of the most seismically active regions in Turkey. The high seismic activity is a result of a complex tectonic deformation dominated by the N-S extensional tectonic regime in Western Anatolia. This tectonic deformation is also a result of the relative movement of the African- Arabian plates towards the north, which causes the Anatolian plate to shift 2.5 cm per year towards W-SW. One of the largest fault zones in the Western Anatolia, Sultandağı Fault Zone (SFZ) has a northwest-southeast trend. SFZ, approximately 120 km long, is an important tectonic structure, which produced three major earthquakes (Mw …

An Example Study On Re-Evaluation Of Historical Earthquakes: 1789 Palu (Elazığ) Earthquake, Eastern Anatolia, Turkey, Mehmet Köküm, Fatih Özçeli̇k

Bulletin of the Mineral Research and Exploration

The East Anatolian Fault (EAF) is an active left-lateral strike-slip fault extending between Karlıova (Bingöl) in the northeast and Iskenderun Bay in the southwest. The Palu, which is the subject of the study area, is located on the Palu segment of the EAF. The Palu segment starts from the northeast of Palu, and is approximately 77 km long, and reaches the Lake Hazar after passing the Baltaşı Plain. Maximum shaking intensity in the earthquake listed in historical catalogs is estimated to have been Mercalli Intensity VIII, with conflicting accounts of as few as 8.000-10.000 to as many as 50.000 people …

The Internal Structure Of Beypazarı Blind Thrust Zone Around Çayırhan, Anıl Ardahanlioğlu, Gürol Seyi̇toğlu, Korhan Esat

Bulletin of the Mineral Research and Exploration

The Beypazarı Blind Thrust Zone, which is surrounded by the North Anatolian, the Eskişehir, and the Kırıkkale-Erbaa fault zones, is a recently defined neotectonic structure developed in the NW central Anatolia together with the Eldivan-Elmadağ and the Abdüsselam Pinched Crustal Wedges. In this study, the internal structure of the Beypazarı Blind Thrust Zone has been examined in detail around Çayırhan region. It has been defined that it consists of the Karaköy, Sekli, Nalçabayırı, Uzunbayır blind thrusts, Davutoğlan Back Thrust, and Beypazarı Blind Thrust I-II from North to south, respectively with help of the fault-propagation folds in the study area. The …

Syn-Sedimentary Tectonic Markings In The Oligocene Datça-Kale-Acı Göl Basin, Western Anatolia, Gülşen Elmas, Gürol Seyi̇toğlu, Nizamettin Kazanci, Veysel Işik

Bulletin of the Mineral Research and Exploration

In southwest Turkey, the Oligocene sedimentary sequence is located on the Datça-Kale-Acı Göl basin between the Menderes Massif and Lycian nappes. To understand the nature of this basin is important for tectonic models that explain the exhumation of the Menderes massif. In the northeast extension of this basin, the sedimentary sequence is interpreted as alluvial fan, fan-delta, beach, marine input, inner shelf carbonates and offshore deposits. The Oligocene Datça-Kale main breakaway fault bounding the south eastern margin of the basin is represented by İnceler and Acı Göl faults in the study area. The wedge geometry of the sequence thickening towards …

Active Tectonic And Paleoseismologic Characteristics Of The Yenice-Gönen Fault, Nw Turkey, In Light Of The 18 March 1953 Yenice-Gönen Earthquake (Ms=7.2), Akın Kürçer, Selim Özalp, Ersin Özdemi̇r, Çağıl Uygun Güldoğan, Tamer Y. Duman

Bulletin of the Mineral Research and Exploration

The Yenice-Gönen Fault (YGF) is located in the central part of the Biga Peninsula between Gönen and Yenice and is a right-lateral strike-slip active fault with general trending N65°E. On 18 March 1953 there was an earthquake on the YGF that died 263 people (Ms=7.2) and a 70 km surface rupture developed during this earthquake. In this study measurements of slip distribution were performed on the surface rupture of the Yenice-Gönen Earthquake (YGE) and the annual slip rate on the YGF was calculated. Right-lateral displacements of between 1.70±0.1 and 3.20±0.2 metres were measured on the surface rupture of the YGE. …

Structural Properties And Tectonic Signi Ficance Of A Shear Zone Discovered Within The Tauride Orogen Near Alanya, Sw Turkey, Volkan Özaksoy

Bulletin of the Mineral Research and Exploration

A major shear zone, referred to as the Yeşilöz Shear Zone, was discovered in the lower Mahmutlar Nappe of the Alanya Nappe Complex in Alanya region. The nappe shows early transposed folds with axial metamorphic foliation and upright open folds formed during emplacement. The NW-trending shear zone is around 2 km wide and mappable over a length segment of 10 km. The shear zone consists of the metamorphic rocks of the host nappe, but with the phyllite mylonitized by vertical shear foliation and the quartzite and marble dispersed as lenticular bodies. These brittle rock bodies show broken upright folds similar …

Neotectonic And Morphotectonic Characteristics Of The Elmali Basin And Near Vicinities, Şule Gürboğa, Özgür Aktürk

Bulletin of the Mineral Research and Exploration

Elmalı Basin, which consists of the Elmalı county and some villages, approximately 120 km far from Antalya city, is one of the recent depositional areas in the extensional neotectonic region of southwestern Turkey. The basin provides signifi cant data for the understanding of the geological evolution to record from the basement to recent depositional units. For this reason, these kinds of structures are used to determine the deformations phases for the evolutionary history of basin formation. In the content of the study, following applications have been investigated: (a) mapping of the area and structures in 1/25.000 scale, (b) information about …

When Did The Plate Tectonics Begin? The Inception Of Plate Tectonics Based On The Existence Of Komatiites And Their Mgo Variations, Anıl Ardahanlioğlu, Efe Demi̇rci̇

Bulletin of the Mineral Research and Exploration

The geoscientists have always wondered what evolutionary processes the Early Earth went through until it reached today. The beginning of the plate tectonics poses another matter of debate in these processes. Yet, the debates on when the plate tectonics began have not been resolved. In this sense, especially the lack of records regarding the period of time before the Cambrian Era is considered the biggest obstacle against resolution of these debates. The geoscientists have befitted from various methods to come up with different proposals about the beginning of the plate tectonics. The most notable rock type among the ones produced …

Tectonic Geomorphology Of Başkale Fault Zone, Azad Sağlam Selçuk, Meryem Düzgün

Bulletin of the Mineral Research and Exploration

Başkale Fault Zone is located between Şemdinli-Yüksekova fault zone in southeast Turkey and Guilato–Siahcheshmeh–Khoy fault system in southeast Iran. The fault zone starts from Yavuzlar town extending to Işıklar village in southwest. The BFZ is composed of three different segments which have orientations varying N75°E to N 80°E. Offset streams, fault-controlled drainage system such as Çığılsuyu stream, alluvial fans which line up parallel to the fault and contain deformation structures, fault flats, Plio-Quaternary volcanic rocks and volcanic structures, and fissure ridge travertines with formation continuing today are among morphotectonic characteristics that indicate the BFZ is active.

The objective of the …

Tectonic Deformations In The Quaternary Deposits Of The Lake Van (Edremi̇t Bay), Eastern Anatolia, Turkey, Selim Özalp, B. Serkan Aydemi̇r, Şeyda Olgun, Barbaros Şi̇mşek, Hasan Elmaci, Murat Evren, Ömer Emre, M. Burak Aydin, Oktar Kurtuluş, Füsun Öcal, Aslı Z. Can, Mehmet N. Yanmaz, Ramazan Apa, Tamer Y. Duman

Bulletin of the Mineral Research and Exploration

The 23 October 2011 Van Earthquake (Mw: 7.2) was generated by the Van Fault Zone (VFZ) with reverse fault characteristics. The earthquake on the fault caused surface deformation with 10 cm displacement observed in engineering structures. On land the VFZ has general E-W strike and 28 km length. The western end of the fault is within Lake Van. This study aimed to determine the tectonic structures and evolution in the Quaternary of Edremit Bay using detailed mapping of the VFZ with land and underwater research methods, investigation of its continuation into Lake Van and common assessment of land and underwater …

Late Cenozoic Extensional Tectonics In Western Anatolia: Exhumation Of The Menderes Core Complex And Formation Of Related Basins, Gurol Seyitoglu, Veysel Isik

Bulletin of the Mineral Research and Exploration

The Aegean region (Western Anatolia, Aegean Sea and Greece) is one of the areas of the earth under the effect of extensional tectonics and includes the typical features of core complexes in this type of region. The Menderes Massif in Western Anatolia was exhumed initially as an asymmetric core complex in the Early Miocene due to extension beginning in the Oligocene and then the central Menderes Massif was further exhumed as a symmetric core complex. This article discusses the exhumation mechanisms of the Menderes Massif and development of surrounding sedimentary basins in light of new findings. The proposed model successfully …

An Approach To Provenance, Tectonic And Redox Conditions Of Jurassic-Cretaceous Akkuyu Formation, Central Taurids, Turkey, Ali Sari, Derya Koca

Bulletin of the Mineral Research and Exploration

Late Jurassic-Early Cretaceous Akkuyu formation was deposited on marine carbonate platform in Central Tarurids. The organic material of the unit is composed of Type III kerogen which is woody material transported from the land. Late Jurassic- Early Cretaceous is an important period which great anoxic events in deep sea bottom occurred due to the primary organic productivity in global sea surface. Use of several trace elements values (Ni, V, U, Cr, Co, Th) revealed that Late Jurassic-Early Cretaceous Akkuyu formation shows oxic, disoxic and anoxic paleoredox conditions. In this period the primary productivity was considerably high. Examination of specimen derived …

Analysis Of Deni̇zli̇ Earthquakes According To Their Activity And Cumulative Activity Terms, Mehmet Utku

Bulletin of the Mineral Research and Exploration

No abstract provided.

Tectonics Of Quaternary Travertine Accumulation At Al-Fatha Area In Middle Iraq, Ibrahim S. Al- Jumaily, Nazar M.S. Numan

Bulletin of the Mineral Research and Exploration

No abstract provided.

Rejuvenation Of The Pre-Cambrian Najd Fault System And Its Importance In The Oil Province Of Saudi Arabia., Doğan Peri̇nçek, Salih Saner, Khattab G. Al-Hi̇nai̇

Bulletin of the Mineral Research and Exploration

No abstract provided.

Orientation Of The Andesitic Dykes In The İstanbul Region: An Approach To The Cretaceous Stress Distribution, Zahide Özgörüş, Aral I. Okay

Bulletin of the Mineral Research and Exploration

No abstract provided.

Neotectonic Activity Of Eski̇şehi̇r Fault Zone In Vicinity Of İnönü – Dodurga Area, Fatma Tokay, Erhan Altunel

Bulletin of the Mineral Research and Exploration

No abstract provided.