Structure and kinematics of the Central Sivas Basin (Turkey): salt deposition and tectonics in an evolving fold-and-thrust belt

Legeay, Etienne; Ringenbach, Jean‐Claude; Kergaravat, Charlie; Pichat, Alexandre; Mohn, Geoffroy; Vergés, Jaume; Kavak, Kaan Şevki; Callot, Jean‐Paul

doi:10.1144/sp490-2019-92

Cited by 24 publications

(91 citation statements)

References 117 publications

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“…Conversely, in other fold-and-thrust belts such as the Zagros (Callot et al, 2012;Jahani et al, 2007), the Atlas (Calvín et al, 2018;Torres-López et al, 2018), or the eastern Prebetic Zone (Escosa et al, 2018), early diapirs, drape or halokinetic folds, and salt domes accounted for a strong precontractional structuring of the cover units that were partly or largely decoupled from the basement. These early salt structures, weaker than adjacent areas, strongly localized shortening during the subsequent compression that obliterated the precontractional architecture (Callot et al, 2007(Callot et al, , 2012Escosa et al, 2018;Legeay et al, 2019). In this sense, the study of extensional domains affected by mild contractional reactivation (such as the Parentis Basin in the Eastern Bay of Biscay, Ferrer et al, 2008Ferrer et al, , 2012Roca et al, 2011) allows a better geometrical and areal characterization of extension-related salt structures.…”

Section: Introductionmentioning

confidence: 99%

Preorogenic Folds and Syn‐Orogenic Basement Tilts in an Inverted Hyperextended Margin: The Northern Pyrenees Case Study

et al. 2020

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The Chaînons Béarnais (CB, North Pyrenean Zone) resulted from the Cenozoic contractional reactivation of the salt tectonics‐bearing, hyperextended margin that initiated at the Europe‐Iberia transition during the Early Cretaceous. In this tectonic scenario, assessing the relative contribution of extension and contraction to the present‐day structure is crucial to reconstruct the hyperextended margin geometry and to quantify the subsequent shortening. This study undertakes this issue by defining the relationship between folding and two bedding‐independent references: peak temperature isotherms and paleomagnetic data. Isotherms were reconstructed from 76 new measurements of Raman spectroscopy on carbonaceous materials (RSCM) and indicate temperatures at the time of peak metamorphism in the CB (110–85 Ma, end of extension). They are shallowly to moderately northwards dipping and cut across most of the folds deforming the Mesozoic units. Paleomagnetic data from 29 sites evidence a widespread remagnetization carried by pyrrhotite that was probably blocked during the early Paleogene (before the onset of continental collision) and postdated folding in the CB. Abnormal inclinations in this remagnetization suggest syn‐collision tilts up to 60° to the north in the back limb of the Axial Zone. Based on the presented data set, we propose that the folding of the cover above the evaporitic décollement was almost fully completed by the end of the Cretaceous extension, with ~85–100% of the dip of fold limbs being acquired before the remagnetization time. Cenozoic contraction reactivated the extensional faults in the shallow basement as top‐to‐the‐S thrusts, leading to the passive transport and northwards tilting of the folded cover.

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Section: Introductionmentioning

confidence: 99%

Preorogenic Folds and Syn‐Orogenic Basement Tilts in an Inverted Hyperextended Margin: The Northern Pyrenees Case Study

et al. 2020

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“…The latest Eocene to Oligocene deposits record the transition from marine to continental depositional environments associated with sedimentation of widespread evaporitic sequences (Figure b). The post‐Oligocene evolution of the Sivas Basin is characterized by important salt tectonic activity well developed in its central and northern parts (Callot et al, ; Kergaravat, ; Kergaravat et al, ; Kergaravat et al, ; Legeay, ; Legeay, Pichat, et al, ; Legeay, Ringenbach, et al, ; Pichat, ; Pichat et al, ; Pichat et al, ; Ribes, ; Ribes et al, ; Ribes et al, ; Ribes et al, ; Ringenbach et al, ).…”

Section: Geological Settingmentioning

confidence: 99%

“…Three distinct structural domains (hereafter referred as Domains A, B and C, Figures a and ) have been distinguished in the description below. The distinction between these three domains is based on their distinct stratigraphic record and structural style, and they are delimited by first‐order tectonic structures (e.g., Legeay, Ringenbach, et al, ). They record key characteristics to depict the Maastrichtian to late Eocene kinematics along the southern Sivas Basin.…”

Section: Structure Of the Southern Margin Of The Sivas Basinmentioning

confidence: 99%

The Pre‐Obduction to Post‐Obduction Evolution of the Sivas Ophiolite (Turkey) and Implications for the Precollisional History of Eastern Anatolia

et al. 2019

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The Anatolian block preserves remnants of Tethyan oceanic basins consumed by north dipping subduction zones until the Late Cretaceous prior to Paleogene collision. The Sivas Basin, which belongs to the Maastrichtian to Cenozoic Central Anatolian basins, is located in a key position limited to the north and the south by respectively the Pontides and Tauride ophiolitic bodies and to the west by the Kırşehir block. This study focuses on the southern margin of the Sivas Basin, where an obducted ophiolite is capped by Maastrichtian‐Paleocene sediments. We present new field observations, with U‐Pb zircon dating on magmatic rocks and geochemical analyses to (1) unravel the pre‐obduction nature and origin of the ophiolitic basement and (2) describe the post‐obduction tectonosedimentary evolution. The pre‐obduction evolution shows that (i) the Sivas ophiolite is characterized by serpentinized peridotites, with minor magmatic intrusions, (ii) the top of the serpentinized mantle is characterized by a cataclastic deformation with ophicalcites interpreted as an extensional detachment fault, (iii) the U‐Pb zircon dating of two magmatic intrusions yield age of 91.49 ± 0.8 Ma and 72.7 ± 0.5 Ma, and (iv) petrological and geochemical data show that the magmatic intrusions were affected by hydrothermal metamorphism. These data suggest that the Sivas ophiolite may have recorded forearc hyperextension in frame of a Late Cretaceous suprasubduction zone. The post‐obduction evolution is characterized by the deposition of a Maastrichtian‐Paleocene carbonate platform on the ophiolite, followed by clastic sediments containing reworked ophiolitic and Tauride Mesozoic clasts.

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“…The objectives of this paper are to characterize the structural architecture, kinematic evolution, and active deformation of the western and central sectors of the SSFTB (Figure 1). Our interpretations are principally based on new detailed geologic mapping, structural analyses of bedding attitudes and fault kinematics, and seismotectonic data along the western and central segments of the SSFTB (Figure 2), which are integrated with insights from recent studies of the stratigraphy, geochronology, and thermochronology of the Sivas Basin (Darin et al, 2018;Schleiffarth et al, 2018;Darin, 2019;Legeay et al, 2019aLegeay et al, , 2019b.…”

Section: Introductionmentioning

confidence: 99%

“…Basin has traditionally been interpreted from stratigraphic relationships based on geologic mapping (e.g., Yılmaz et al, 1989;Atabey and Aktimur, 1997;MTA, 2002;Bilgiç and Terlemez, 2007;Bilgiç, 2008), as well as a few structural studies that have recognized elemental aspects of the local deformation history in the western (Gökten, 1983;Dirik et al, 1999) and central Sivas Basin (Ketin, 1966;Kurtman, 1973;Gürsoy et al, 1992;Poisson et al, 1992Poisson et al, , 1996Temiz, 1996;Guezou et al, 1996;Kergaravat et al, 2016;Legeay et al, 2019aLegeay et al, , 2019b. Recent detailed sedimentologic, stratigraphic, and structural studies from the central Sivas Basin have highlighted the early basin evolution associated with Late Cretaceous ophiolite obduction (Yılmaz and Yılmaz, 2006;Legeay et al, 2019a) and the fundamental role of salt tectonic processes in controlling the tectonosedimentary evolution to the north of the SSFTB and along its northern margin (Ribes et al, 2015;Kergaravat et al, 2016Kergaravat et al, , 2017Legeay et al, 2019b). However, detailed structural mapping and systematic documentation of the style, spatial pattern, kinematics, and magnitude of deformation have not been conducted along the axis of the SSFTB and farther south in the southern Sivas Basin.…”

Section: Introductionmentioning

confidence: 99%

Structure and kinematic evolution of the Southern Sivas Fold-Thrust Belt, Sivas Basin, Central Anatolia, Turkey

Darin

Umhoefer²

2019

Turkish J Earth Sci

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The architecture, kinematics, and timing of fold-and-thrust belt development provide essential first-order constraints on the structural evolution of continental collision zones. The southern Sivas fold-thrust belt (SSFTB) is a ~300 × 50-km-long, ENEtrending contractional belt located in the Sivas Basin at the western end of the Arabia-Eurasia collision zone, and along the İzmir-Ankara-Erzincan and Inner Tauride suture zones. We present new geologic mapping and the first detailed structural characterization and seismotectonic evidence of active deformation along the western and central segments of the SSFTB that provide new insights into the timing and kinematics of deformation associated with collision and escape in Central Anatolia. The SSFTB is a dominantly north-vergent contractional belt that initiated during the late Eocene and experienced several punctuated episodes of shortening and exhumation, primarily during the late Oligocene and late Miocene. Structural mapping and balanced cross-sections reveal that minimum cumulative shortening increases from west (29%) to east (34%) along the belt, along with a gradual eastward increase in fold asymmetry and a progressive transition from fold-related to overturned fold-and-thrust-related shortening. The kinematics of the central and eastern SSFTB changed from north-vergent thrusting during the late Eocene and Oligocene to predominantly south-vergent during the Miocene. Contraction in the SSFTB ended by ~7-6 Ma and was followed by a switch to distributed and kinematically linked sinistral strike-slip and normal faulting along the northeastern segment of the Central Anatolian fault zone. Offset strain markers suggest a total of at least 1.7-2.4 km of left-lateral slip on the Deliler fault and ~940 m of normal slip on the Hınzır fault. The latest Miocene to Pliocene switch to intraplate strike-slip deformation marks a regional transition to westward tectonic escape of the Anatolian microplate.

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Structure and kinematics of the Central Sivas Basin (Turkey): salt deposition and tectonics in an evolving fold-and-thrust belt

Cited by 24 publications

References 117 publications

Preorogenic Folds and Syn‐Orogenic Basement Tilts in an Inverted Hyperextended Margin: The Northern Pyrenees Case Study

Preorogenic Folds and Syn‐Orogenic Basement Tilts in an Inverted Hyperextended Margin: The Northern Pyrenees Case Study

The Pre‐Obduction to Post‐Obduction Evolution of the Sivas Ophiolite (Turkey) and Implications for the Precollisional History of Eastern Anatolia

Structure and kinematic evolution of the Southern Sivas Fold-Thrust Belt, Sivas Basin, Central Anatolia, Turkey

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