scholarly journals Cenozoic tectonic evolution of the Ecemiş fault zone and adjacent basins, central Anatolia, Turkey, during the transition from Arabia-Eurasia collision to escape tectonics

Geosphere ◽  
2020 ◽  
Vol 16 (6) ◽  
pp. 1358-1384
Author(s):  
Paul J. Umhoefer ◽  
Stuart N. Thomson ◽  
Côme Lefebvre ◽  
Michael A. Cosca ◽  
Christian Teyssier ◽  
...  
Keyword(s):  
Fault Zone ◽  
Tectonic Evolution ◽  
Tectonic Setting ◽  
Structural Data ◽  
Late Eocene ◽  
Central Anatolia ◽  
Normal Faults ◽  
Profound Change ◽  
Escape Tectonics ◽  
Lateral Offset

Abstract The effects of Arabia-Eurasia collision are recorded in faults, basins, and exhumed metamorphic massifs across eastern and central Anatolia. These faults and basins also preserve evidence of major changes in deformation and associated sedimentary processes along major suture zones including the Inner Tauride suture where it lies along the southern (Ecemiş) segment of the Central Anatolian fault zone. Stratigraphic and structural data from the Ecemiş fault zone, adjacent NE Ulukışla basin, and metamorphic dome (Niğde Massif) record two fundamentally different stages in the Cenozoic tectonic evolution of this part of central Anatolia. The Paleogene sedimentary and volcanic strata of the NE Ulukışla basin (Ecemiş corridor) were deposited in marginal marine to marine environments on the exhuming Niğde Massif and east of it. A late Eocene–Oligocene transpressional stage of deformation involved oblique northward thrusting of older Paleogene strata onto the eastern Niğde Massif and of the eastern massif onto the rest of the massif, reburying the entire massif to >10 km depth and accompanied by left-lateral motion on the Ecemiş fault zone. A profound change in the tectonic setting at the end of the Oligocene produced widespread transtensional deformation across the area west of the Ecemiş fault zone in the Miocene. In this stage, the Ecemiş fault zone had at least 25 km of left-lateral offset. Before and during this faulting episode, the central Tauride Mountains to the east became a source of sediments that were deposited in small Miocene transtensional basins formed on the Eocene–Oligocene thrust belt between the Ecemiş fault zone and the Niğde Massif. Normal faults compatible with SW-directed extension cut across the Niğde Massif and are associated with a second (Miocene) re-exhumation of the Massif. Geochronology and thermochronology indicate that the transtensional stage started at ca. 23–22 Ma, coeval with large and diverse geological and tectonic changes across Anatolia.

scholarly journals Supplemental Material: Cenozoic tectonic evolution of the Ecemiş fault zone and adjacent basins, central Anatolia, Turkey during the transition from Arabia-Eurasia collision to escape tectonics

2020 ◽  
Author(s):  
P.J. Umhoefer ◽  
et al.
Keyword(s):  
Fault Zone ◽  
Tectonic Evolution ◽  
Fission Track ◽  
Volcanic Rocks ◽  
Detrital Zircons ◽  
Central Anatolia ◽  
Zircon Fission Track ◽  
Escape Tectonics

Consists of geochronology and thermochronology data, and methods related to those data. Geochronology data are from <sup>40</sup>Ar/<sup>39</sup>Ar dating of volcanic rocks and U-Pb analysis of detrital zircons, while thermochronology data are from apatite and zircon fission-track and apatite helium cooling ages.

scholarly journals Supplemental Material: Cenozoic tectonic evolution of the Ecemiş fault zone and adjacent basins, central Anatolia, Turkey during the transition from Arabia-Eurasia collision to escape tectonics

2020 ◽  
Author(s):  
P.J. Umhoefer ◽  
et al.
Keyword(s):  
Fault Zone ◽  
Tectonic Evolution ◽  
Fission Track ◽  
Volcanic Rocks ◽  
Detrital Zircons ◽  
Central Anatolia ◽  
Zircon Fission Track ◽  
Escape Tectonics

Consists of geochronology and thermochronology data, and methods related to those data. Geochronology data are from <sup>40</sup>Ar/<sup>39</sup>Ar dating of volcanic rocks and U-Pb analysis of detrital zircons, while thermochronology data are from apatite and zircon fission-track and apatite helium cooling ages.

scholarly journals Late-stage tectonic evolution of the Al-Hajar Mountains, Oman: new constraints from Palaeogene sedimentary units and low-temperature thermochronometry

2019 ◽  
Vol 157 (7) ◽  
pp. 1031-1044 ◽  
Author(s):  
A Corradetti ◽  
V Spina ◽  
S Tavani ◽  
JC Ringenbach ◽  
M Sabbatino ◽  
...  
Keyword(s):  
Low Temperature ◽  
Tectonic Evolution ◽  
Sedimentary Rocks ◽  
Structural Data ◽  
Late Eocene ◽  
Seismic Interpretation ◽  
Structural Investigations ◽  
Mountain Belt ◽  
Tethys Ocean ◽  
Mountain Chain

AbstractMountain building in the Al-Hajar Mountains (NE Oman) occurred during two major shortening stages, related to the convergence between Africa–Arabia and Eurasia, separated by nearly 30 Ma of tectonic quiescence. Most of the shortening was accommodated during the Late Cretaceous, when northward subduction of the Neo-Tethys Ocean was followed by the ophiolites obduction on top of the former Mesozoic margin. This shortening event lasted until the latest Santonian – early Campanian. Maastrichtian to Eocene carbonates unconformably overlie the eroded nappes and seal the Cretaceous foredeep. These neo-autochthonous post-nappe sedimentary rocks were deformed, along with the underlying Cretaceous tectonic pile, during the second shortening event, itself including two main exhumation stages. In this study we combine remotely sensed structural data, seismic interpretation, field-based structural investigations and apatite (U–Th)/He (AHe) cooling ages to obtain new insights into the Cenozoic deformation stage. Seismic interpretation indicates the occurrence of a late Eocene flexural basin, later deformed by an Oligocene thrusting event, during which the post-nappe succession and the underlying Cretaceous nappes of the internal foredeep were uplifted. This stage was followed by folding of the post-nappe succession during the Miocene. AHe data from detrital siliciclastic deposits in the frontal area of the mountain chain provide cooling ages spanning from 17.3 to 42 Ma, consistent with available data for the structural culminations of Oman. Our work points out how renewal of flexural subsidence in the foredeep and uplift of the mountain belt were coeval processes, followed by layer-parallel shortening preceding final fold amplification.

scholarly journals The tectonic evolution of Lake Eğirdir, West Turkey

Geologos ◽  
2010 ◽  
Vol 16 (4) ◽  
pp. 223-234 ◽  
Author(s):  
M. Karaman
Keyword(s):  
Fresh Water ◽  
Late Miocene ◽  
Tectonic Evolution ◽  
Middle Miocene ◽  
Lacustrine Sediments ◽  
Central Anatolia ◽  
Normal Faults ◽  
Western Anatolia ◽  
Isparta Angle ◽  
Topographic Condition

The tectonic evolution of Lake Eğirdir, West Turkey Lake Eğirdir is one of the most important fresh-water lakes of Turkey. It has a tectonics-related origin. The area formed under a roughly N-S compressional tectonic regime during the Middle Miocene. The stresses caused slip faults west and east of Isparta Angle, and the lake formed at the junction of these faults. The area subsided between normal faults, thus creating the topographic condition required for a lake. The lacustrine sediments have fundamentally different lithologies. After the Late Miocene, central Anatolia started to move westwards, but western Anatolia moved in a SW direction along the South-western Anatolian Fault, which we suggest to have a left lateral slip, which caused that the Hoyran Basin moved t7 km towards the SW and rotated 40° counterclockwise relative to Lake Eğirdir.

Neogene tectonics during granite emplacement in Northern Apennines: the case of the Gavorrano monzogranite (southern Tuscany, Italy)

2021 ◽  
Author(s):  
Domenico Liotta ◽  
Alfredo Caggianelli ◽  
Andrea Brogi ◽  
Martina Zucchi ◽  
Amalia Spina ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
Tectonic Setting ◽  
Structural Data ◽  
Northern Apennines ◽  
Past Century ◽  
Extensional Tectonics ◽  
The Past ◽  
Granite Emplacement ◽  
Geothermal Fluids ◽  
Magmatic Body

&lt;p&gt;The tectonic setting of Neogene is under debate, being interpreted as a contractional, pulsing or extensional framework. On the key-areas to unravel this issue is the Gavorrano monzogranite, located &amp;#160;nearby the Tyrrhenian seacoast, in the inner zone of the Northern Apennines (southern Tuscany), where a Neogene monzogranite body (estimated in about 3 km long, 1.5 km wide, and 0.7 km thick) emplaced during early Pliocene. This magmatic intrusion is partially exposed in a ridge bounded by regional faults delimiting broad structural depressions. A widespread circulation of geothermal fluids accompanied the cooling of the magmatic body and gave rise to an extensive Fe-ore deposit (mainly pyrite) exploited during the past century. Data from a new fieldwork dataset, integrated with information from the mining activity, have been integrated to refine the geological setting of the whole crustal sector where the Gavorrano monzogranite was emplaced and exhumed. Our review, implemented by new palynological, petrological and structural data pointed out that: i) the age of the Palaeozoic phyllite (hosting rocks) is middle-late Permian, thus resulting younger than previously described (i.e. pre-Carboniferous); ii) the P-T conditions at which the metamorphic aureole developed are estimated at about 660 &amp;#176;C and at a maximum depth of c. 5 km; iii) the tectonic evolution which determined the emplacement and exhumation of the monzogranite is constrained in a transfer zone, in the frame of the extensional tectonics affecting the area continuously since Miocene.&lt;/p&gt;

Structural and geological mapping of the Gran Sometta-Tournalin ridge (Aosta Valley, Italy)

2020 ◽  
Author(s):  
Matteo Pozzi ◽  
Gloria Arienti ◽  
Anna Losa ◽  
Andrea Bistacchi
Keyword(s):  
Fault Zone ◽  
Structural Data ◽  
Shear Zones ◽  
Geological Mapping ◽  
Level Of Detail ◽  
Greenschist Facies ◽  
Normal Faults ◽  
High Angle ◽  
Crenulation Cleavage ◽  
High Level

&lt;p&gt;We present a new geological and structural map of the Gran Sometta -Tournalin ridge (Valle d&amp;#8217;Aosta). In this area we have Pennidic ophiolitic units of the Combin (Co) and Zermatt-Saas (ZS) zones. In addition, in this area the continental cover sequence of the Pancherot-Cime Bianche-Bettaforca (PCB) unit crops out, close to the base of the Combin zone. The PCB and Co are characterized by Alpine greenschist facies assemblages, while the ZS is characterized by eclogitic assemblages. The greenschist and HP complexes are juxtaposed along the extensional Combin Fault Zone.&lt;/p&gt;&lt;p&gt;Our detailed 1:5000 map allowed reconstructing in 3D, and with a high level of detail, the spatial and crosscutting relationships between metamorphic layering (e.g. calcschists and metabasites in the Co), ductile foliations and shear zones, semi-brittle features (e.g. extensional crenulation cleavage &amp;#8211; ECC - along the Combin Fault Zone), and post-metamorphic brittle faults.&lt;/p&gt;&lt;p&gt;The metamorphic layering and foliations are sub-horizontal in this area, and the ECC associated to the Combin Fault results in large components of horizontal stretching. These features are crosscut by two sets of high-angle normal faults, of Oligocene and Miocene age (according to literature), and, thanks to the favourable exposure and numerous structural data, we have been able to reconstruct these structures and their relationships in 3D.&lt;/p&gt;

scholarly journals Micro-tectonic constraints on the evolution of the Barles half-window (Digne nappe, southern Alps). Implications for the timing of folding in the Valensole foreland basin

2008 ◽  
Vol 179 (6) ◽  
pp. 551-568 ◽  
Author(s):  
Marc Fournier ◽  
Philippe Agard ◽  
Carole Petit
Keyword(s):  
Late Miocene ◽  
Tectonic Setting ◽  
Regional Scale ◽  
Foreland Basin ◽  
Structural Data ◽  
Late Eocene ◽  
Rift System ◽  
Late Cenozoic ◽  
Northern Margin ◽  
Two Phases

Abstract The “Vélodrome” overturned syncline, at the northern margin of the Cenozoic foreland basin of Valensole in SE France, was formed during the Late Cenozoic at the front of the Digne nappe. Microstructural analyses reveal that mesoscale faulting in the molassic series, from the Oligocene “Molasse Rouge” at the base to the middle to late Miocene “Valensole Conglomerates” at the top, partly occurred before the folding, as layer-parallel shortening: the NNE-SSW-directed compression is recorded by two systems of reverse and strike-slip faults, which formed when the strata were still horizontal and were passively tilted as folding occurred. These data suggest that the Vélodrome folding postdates the deposition of the Valensole Conglomerates and occurred in late Miocene-Pliocene times during the emplacement of the Digne nappe. These results are difficult to reconcile with the interpretation of the Vélodrome as a growth fold progressively formed in 10–15 m.y. during the deposition of the Miocene molasses. Structural data collected in the Barles tectonic half-window enable to reconstruct the evolution of the deformation since the Jurassic. The two main phases of shortening, the pre-Oligocene Pyrenean-Provençal and the Mio-Pliocene Alpine phases, are almost homoaxial with a direction of compression trending N-S for the former and NNE-SSW for the later. A late Eocene-basal Oligocene N-S extensional episode is documented between these two phases, probably in relation with the formation of the western European rift system. The direction of extension of the Liassic rifting of the Alpine Tethys is roughly constrained in the NW-SE quadrant. Paleo-stress field reconstruction brings consistent results at the regional scale and proves to be a powerful tool to decipher the evolution of the deformation in a remarkably complicated tectonic setting.

scholarly journals The Gavorrano Monzogranite (Northern Apennines): An Updated Review of Host Rock Protoliths, Thermal Metamorphism and Tectonic Setting

2020 ◽  
Author(s):  
Andrea Brogi ◽  
Alfredo Caggianelli ◽  
Domenico Liotta ◽  
Martina Zucchi ◽  
Amalia Spina ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
Tectonic Setting ◽  
Structural Data ◽  
Northern Apennines ◽  
Past Century ◽  
Extensional Tectonics ◽  
The Past ◽  
Geological Setting ◽  
Geothermal Fluids ◽  
Magmatic Body

We review and refine the geological setting of an area located nearby the Tyrrhenian seacoast, in the inner zone of the Northern Apennines (southern Tuscany), where a Neogene monzogranite body (estimated in about 3 km long, 1.5 km wide, and 0.7 km thick) emplaced during early Pliocene. This magmatic intrusion, known as the Gavorrano pluton, is partially exposed in a ridge bounded by regional faults delimiting broad structural depressions. A widespread circulation of geothermal fluids accompanied the cooling of the magmatic body and gave rise to an extensive Fe-ore deposit (mainly pyrite) exploited during the past century. The tectonic setting which favoured the emplacement and exhumation of the Gavorrano pluton is strongly debated with fallouts on the comprehension of the Neogene evolution of this sector of the inner Northern Apennines. Data from a new fieldwork dataset, integrated with information from the mining activity, have been integrated to refine the geological setting of the whole crustal sector where the Gavorrano monzogranite was emplaced and exhumed. Our review, implemented by new palynological, petrological and structural data pointed out that: i) the age of the Palaeozoic phyllite (hosting rocks) is middle-late Permian, thus resulting younger than previously described (i.e. pre-Carboniferous); ii) the P-T conditions at which the metamorphic aureole developed are estimated at about 660 &deg;C and at a maximum depth of c. 5 km; iii) the tectonic evolution which determined the emplacement and exhumation of the monzogranite is constrained in a transfer zone, in the frame of the extensional tectonics affecting the area continuously since Miocene.

scholarly journals The Gavorrano Monzogranite (Northern Apennines): An Updated Review of Host Rock Protoliths, Thermal Metamorphism and Tectonic Setting

Geosciences ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 124
Author(s):  
Andrea Brogi ◽  
Alfredo Caggianelli ◽  
Domenico Liotta ◽  
Martina Zucchi ◽  
Amalia Spina ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
Tectonic Setting ◽  
Structural Data ◽  
Northern Apennines ◽  
Past Century ◽  
Extensional Tectonics ◽  
The Past ◽  
Geological Setting ◽  
Geothermal Fluids ◽  
Magmatic Body

We review and refine the geological setting of an area located nearby the Tyrrhenian seacoast, in the inner zone of the Northern Apennines (southern Tuscany), where a Neogene monzogranite body (estimated in about 3 km long, 1.5 km wide, and 0.7 km thick) emplaced during early Pliocene. This magmatic intrusion, known as the Gavorrano pluton, is partially exposed in a ridge bounded by regional faults delimiting broad structural depressions. A widespread circulation of geothermal fluids accompanied the cooling of the magmatic body and gave rise to an extensive Fe-ore deposit (mainly pyrite) exploited during the past century. The tectonic setting which favoured the emplacement and exhumation of the Gavorrano pluton is strongly debated with fallouts on the comprehension of the Neogene evolution of this sector of the inner Northern Apennines. Data from a new fieldwork dataset, integrated with information from the mining activity, have been integrated to refine the geological setting of the whole crustal sector where the Gavorrano monzogranite was emplaced and exhumed. Our review, implemented by new palynological, petrological and structural data pointed out that: (i) the age of the Palaeozoic phyllite (hosting rocks) is middle-late Permian, thus resulting younger than previously described (i.e., pre-Carboniferous); (ii) the conditions at which the metamorphic aureole developed are estimated at a temperature of c. 660 °C and at a depth lower than c. 6 km; (iii) the tectonic evolution which determined the emplacement and exhumation of the monzogranite is constrained in a transfer zone, in the frame of the extensional tectonics affecting the area continuously since Miocene.

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