Geochronology, geochemistry, and petrogenesis of the Maçka subvolcanic intrusions: implications for the Late Cretaceous magmatic and geodynamic evolution of the eastern part of the Sakarya Zone, northeastern Turkey

2014 ◽  
Vol 56 (10) ◽  
pp. 1246-1275 ◽  
Author(s):  
Faruk Aydin
Keyword(s):  
Late Cretaceous ◽  
Geodynamic Evolution ◽  
Sakarya Zone

The Ganj Complex reinterpreted as a Late Cretaceous volcanic arc: Implications for the geodynamic evolution of the North Makran domain (southeast Iran)

2020 ◽  
Vol 195 ◽  
pp. 104306 ◽  
Author(s):  
Edoardo Barbero ◽  
Morteza Delavari ◽  
Asghar Dolati ◽  
Emilio Saccani ◽  
Michele Marroni ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Geodynamic Evolution ◽  
Volcanic Arc ◽  
The North

scholarly journals Distinguishing the Mélange-Forming Processes in Subduction-Accretion Complexes: Constraints from the Anisotropy of Magnetic Susceptibility (AMS)

Geosciences ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 381 ◽  
Author(s):  
Claudio Robustelli Test ◽  
Andrea Festa ◽  
Elena Zanella ◽  
Giulia Codegone ◽  
Emanuele Scaramuzzo
Keyword(s):  
Magnetic Susceptibility ◽  
Late Cretaceous ◽  
Anisotropy Of Magnetic Susceptibility ◽  
Magnetic Fabric ◽  
Early Eocene ◽  
Accretionary Complex ◽  
Geodynamic Evolution ◽  
Structural Investigations ◽  
Laboratory Investigations ◽  
Magnetic Features

The strong morphological similitude of the block-in-matrix fabric of chaotic rock units (mélanges and broken formations) makes problematic the recognition of their primary forming-processes. We present results of the comparison between magnetic fabric and mesoscale structural investigations of non-metamorphic tectonic, sedimentary, and polygenetic mélanges in the exhumed Late Cretaceous to early Eocene Ligurian accretionary complex and overlying wedge-top basin succession in the Northern Apennines (northwest Italy). Our findings show that the magnetic fabric reveals diagnostic configurations of principal anisotropy of magnetic susceptibility (AMS) axes orientation that are well comparable with the mesoscale block-in-matrix fabric of mélanges formed by different processes. Broken formations and tectonic mélanges show prolate and neutral-to-oblate ellipsoids, respectively, with magnetic fabric elements being consistent with those of the mesoscale anisotropic “structurally ordered” block-in-matrix fabric. Sedimentary mélanges show an oblate ellipsoid with a clear sedimentary magnetic fabric related to downslope gravitational emplacement. Polygenetic mélanges show the occurrence of a cumulative depositional and tectonic magnetic fabric. The comparison of field and laboratory investigations validate the analysis of magnetic features as a diagnostic tool suitable to analytically distinguish the contribution of different mélange forming-processes and their mutual superposition, and to better understand the geodynamic evolution of subduction-accretion complexes.

scholarly journals Nature of clays in Late Cretaceous dacitic rocks in the eastern Sakarya Zone (NE Turkey): a geochemical and isotopic approach

2020 ◽  
Vol 29 (6) ◽  
pp. 831-852
Author(s):  
Ferkan SİPAHİ ◽  
Mehmet Ali GÜCER ◽  
Münür Burhan SADIKLAR
Keyword(s):  
Late Cretaceous ◽  
Sakarya Zone

Petrological and geodynamic evolution of the Late Cretaceous subduction-related volcanism in the eastern Sakarya Zone, NE Turkey

2020 ◽  
Author(s):  
Simge Oğuz Saka ◽  
Faruk Aydin ◽  
Cüneyt Şen ◽  
Abdurrahman Dokuz ◽  
Thomas Aiglsperger ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Volcanic Rocks ◽  
Geochemical Data ◽  
Spinel Lherzolite ◽  
Volcanic Event ◽  
Geochemical Composition ◽  
Basaltic Rocks ◽  
Rock Types ◽  
Sakarya Zone ◽  
Felsic Volcanic

<p>Based on the volcanostratigraphic studies, zircon U-Pb dating and geochemical data, the Late Cretaceous volcanic rocks (LCVs) from the Artvin region in the eastern Sakarya zone (NE Turkey) consist of mafic/basaltic (S1-Çatak and S2-Çağlayan) and felsic/acidic (S1-Kızılkaya and S2-Tirebolu) rock types that occurred in two successive stages: (i) first stage (S1: Turonian to Early Santonian) and (ii) second stage (S2: Late Santonian to Campanian). In both stages, the basaltic rocks contain generally calcic plagioclase and lesser augite crystals, whereas the acidic samples commonly contain quartz, sodic plagioclase and K-sanidine phenocrysts. Data from clinopyroexene thermobarometry point to the S2-Çağlayan basaltic rocks having crystallised at higher temperatures and under deeper crustal conditions (T = 1128 ± 15 <sup>o</sup>C, P = 6.5 ± 0.7 kbar and D = 19.5 ± 2.1 km) than those of the S1-Çatak rocks (T = 1073 ± 11 <sup>o</sup>C, P = 2.2 ± 1.0 kbar, D = 6.6 ± 3.0 km).</p><p>The LCVs show a wide compositional spectrum, ranging from tholeiite to calc-alkaline/shoshonite and are typically represented by a geochemical composition resembling subduction-related arc rocks although the <sup>87</sup>Sr/<sup>86</sup>Sr<sub>(i)</sub> (0.7044–0.7071) and ɛNd<sub>(i)</sub> values (-0.63 to +3.47) as well as <sup>206</sup>Pb/<sup>204</sup>Pb<sub>(i)</sub> (18.07 to 18.56), <sup>207</sup>Pb/<sup>204</sup>Pb<sub>(i)</sub> (15.57 to 15.62) and <sup>208</sup>Pb/<sup>204</sup>Pb<sub>(i)</sub> (37.12 to 38.55) ratios show very limited variation. The average δ<sup>18</sup>O isotope values of the S1-Kızılkaya (5.3 ± 0.5‰) and S2-Tirebolu (4.9 ± 0.8‰) zircons are quite consistent with average mantle values (5.3 ± 0.3‰). The similar isotopic compositions of the studied mafic and felsic volcanic rocks, and the relatively high Mg# values (up to 0.4–0.51) of the felsic samples indicate a cogenetic origin. The parent magmas of the S1-Çatak and S2-Çağlayan mafic volcanic rocks were derived from underplated basaltic melts that originated by partial melting of metasomatised spinel lherzolite and spinel-garnet lherzolite, respectively. It is proposed that the compositions of the S1-Kızılkaya (mainly dacitic) and S2-Tirebolu (rhyolitic to trachytic) felsic rocks were particularly controlled by metasomatised mantle–crust interaction and MASH zone plus shallow crustal fractionation processes.</p><p>Our data, together with data from previous studies, suggest that the S1- and S2-mafic and felsic rock types of the LCVs (~95–75 Ma) are the products of two-stage volcanic event that took place during the northward subduction of the northern Neotethys Ocean.</p><p> </p><p>Acknowledgement</p><p>This study was financially supported by Scientific and Technological Research Council of Turkey (TUBITAK) with grant# 112Y365.</p>

Crustal source of the Late Cretaceous Satansarı monzonite stock (central Anatolia – Turkey) and its significance for the Alpine geodynamic evolution

2013 ◽  
Vol 65 ◽  
pp. 82-93 ◽  
Author(s):  
Serhat Köksal ◽  
Fatma Toksoy-Köksal ◽  
M. Cemal Göncüoğlu ◽  
Andreas Möller ◽  
Axel Gerdes ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Central Anatolia ◽  
Geodynamic Evolution ◽  
Crustal Source

scholarly journals At the crossroads of the Lesser Caucasus and the Eastern Pontides: Late Cretaceous to early Eocene magmatic and geodynamic evolution of the Bolnisi district, Georgia

Lithos ◽  
2020 ◽  
Vol 378-379 ◽  
pp. 105872
Author(s):  
Robert Moritz ◽  
Nino Popkhadze ◽  
Marc Hässig ◽  
Titouan Golay ◽  
Jonathan Lavoie ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Early Eocene ◽  
Geodynamic Evolution ◽  
Eastern Pontides ◽  
Lesser Caucasus

scholarly journals The pull apart-type Tardets-Mauléon Basin, a key to understand the formation of the Pyrenees

2017 ◽  
Vol 188 (6) ◽  
pp. 35 ◽  
Author(s):  
Joseph Canérot
Keyword(s):  
Oceanic Crust ◽  
Late Cretaceous ◽  
Conceptual Models ◽  
Strike Slip ◽  
Rift System ◽  
Geodynamic Evolution ◽  
Lateral Strike Slip ◽  
Crustal Thinning ◽  
Tectonic Inversion ◽  
Mantle Exhumation

Contrary to recent conceptual models, we evidence that the Mauléon Basin does not only result from the Pyrenean tectonic inversion of an aborted Albian rift involving a N-S extreme crust thinning, with related detachment and mantle exhumation. It actually corresponds to an element of this rift system where E-W dominant regional sinistral strike slip faulting between its European and Iberian margins generated as early as the Latest Aptian (Clansayesian) an oblique pull apart-type basin: the Tardets-Sorholus Trough. Then, towards the Late to Latest Albian period, the active transverse, SW-NE oriented, Barlanès and Saison listric faults provided the main crustal thinning leading locally (Urdach) to mantle exhumation. Finally, at the beginning of the Late Cretaceous, the trough widened through transtension motion (N-S distension associated with E-W sinistral strike slip) leading to the creation of the Mauléon Basin. This geodynamic evolution gives to the Mauléon Basin its logical place between the western Bilbao Basin where oceanic crust developed through dominant N-S extension process and the central and eastern north Pyrenean basins where dominant E-W left lateral strike slip then transpressive motion preclude mantle denudation. From the Late to Latest Cretaceous, the inverted motion turning to generalized regional transpression led to the closure of the trough, then, by gradual uplift from east to west, to the formation of the Pyrenean range.

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