The crustal structure of the East Anatolian plateau (Turkey) from receiver functions

Zor, Ekrem; Sandvol, Eric; Gurbuz, C.; Türkelli, N.; Şeber, Dog̃an; Barazangi, Muawia

doi:10.1029/2003gl018192

Cited by 221 publications

(179 citation statements)

References 18 publications

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“…In the northern and northwestern part of the platform, the crust seems to vary between 33 and 40 km [18][19][20][21]. Surface waves as well as regional waveform modeling indicate that on average the Arabian shield crust is 40 -45 km thick, slightly thicker than the average crust for most shields on earth [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Crustal structure of the Arabian plate: new constraints from the analysis of teleseismic receiver functions

Aldamegh¹,

Sandvol²,

Barazangi³

2005

Earth and Planetary Science Letters

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133

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We also employed a grid search waveform modeling technique to estimate the crustal velocity structure for seven stations. A jackknife re-sampling approach was used to estimate errors in the grid search results for three stations. In addition to our results, we have also included published receiver function results from two temporary networks in the Arabian shield and Oman as well as three permanent GSN stations in the region.The average crustal thickness of the late Proterozoic Arabian shield is 39 km. The crust thins to about 23 km along the Red Sea coast and to about 25 km along the margin of the Gulf of Aqaba. In the northern part of the Arabian platform, the crust varies from 33 -37 km thick.However, the crust is thicker (41 -53 km) in the southeastern part of the platform. There is a dramatic change in crustal thickness between the topographic escarpment of the Arabian shield and the shorelines of the Red Sea. We compared our results in the Arabian shield to nine other Proterozoic and Archean shields that include reasonably well-determined Moho depths, mostly based on receiver functions. The average crustal thickness for all shields is 39 km, while the average for Proterozoic shields is 40 km, and the average for Archean shields is 38 km. We found the crustal thickness of Proterozoic shields to vary between 33 and 44 km, while Archean shields vary between 32 and 47 km. Overall, we do not observe a significant difference between Proterozoic and Archean crustal thickness. 3We observed a dramatic change in crustal thickness along the Red Sea margin that occurs over a very short distance. We projected our results over a cross section extending from the Red Sea ridge to the shield escarpment and contrasted it with a typical Atlantic margin. The transition from oceanic to continental crust of the Red Sea margin occurs over a distance of about 250 km, while the transition along a typical portion of the western Atlantic margin occurs at a distance of about 450 km. This important new observation highlights the abruptness of the breakup of Arabia. We argue that a preexisting zone of weakness coupled with anomalously hot upper mantle could have initiated and expedited the breakup.

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Section: Introductionmentioning

confidence: 99%

Crustal structure of the Arabian plate: new constraints from the analysis of teleseismic receiver functions

Aldamegh¹,

Sandvol²,

Barazangi³

2005

Earth and Planetary Science Letters

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133

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“…Paul et al 2006Paul et al , 2010 regions and 3D regional studies (e.g. Zor et al 2003), although less than 19% of the region has crustal thickness data coverage better than one measurement per 50 000 km 2 . Robert et al's maps show that crustal thickening is at a maximum beneath the high topographic areas across the region (e.g.…”

Section: Regional Evolution and Extensional Sedimentary Basinsmentioning

confidence: 99%

Geological evolution of Central Asian Basins and the western Tien Shan Range

Brunet

Sobel

McCann³

2017

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The geological evolution of Central Asia commenced with the evolution of a complex Precambrian–Palaeozoic orogen. Cimmerian blocks were then accreted to the southern margin during the Mesozoic, leading to tectonic reactivation of older structures and discrete episodes of basin formation. The Indian and Arabian blocks collided with Asia during the Cenozoic, leading to renewed structural reactivation, intracontinental deformation and basin development. This complex evolution resulted in the present-day setting of an elongated Tien Shan range flanked by large Mesozoic–Cenozoic sedimentary basins with smaller intramontane basins distributed within the range. The aim of this volume is to present multidisciplinary results and reviews from research groups in Europe and Central Asia that focus on the western part of the Tien Shan and some of the large sedimentary basins in that area. These works elucidate the Late Palaeozoic–Cenozoic tectono-sedimentary evolution of the area. Emphasis is placed on the collision of terranes and/or continents and the ensuing fault reactivation; the impact of changes in climate on the sedimentation is also examined.

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“…Dacitic products (15.30 Ma ± 0.20), which formed as a result of partial melting of the lower continental crust, were first. They were considered to move into the asthenosphere at depth of the 40-45 km (Barazangi, Sandvol, & Seber, 2006;Keskin, 2003;Şengör, Özeren, Zor, & Gene, 2003;Zor et al, 2003) of the lithospheric slab after breaking due to the weight of the lithospheric slab and convection flows, basaltic products had settled in this region (13.50-14 Ma ± 0.20), together with aforementioned uplift by means of breakage. Basic and dacitic magmas had mixed due to the uplift of the basic products and formed andesitic products (14-15 Ma ± 0.20).…”

Section: Geological Settingmentioning

confidence: 99%

Collision-related slab break-off volcanism in the Eastern Anatolia, Kepez volcanic complex (TURKEY)

Eki̇ci̇

2016

Geodinamica Acta

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The Neogene-Quaternary volcanic products, related to Arabian and Anatolian Plate collision along the Bitlis Suture Zone, cover wide areas on both plates. One of these volcanic exposures on the Arabian Plate is the Kepez volcanic complex (KVC). This study aims explain to petrogenesis of KVC. Although some examples display alkaline affinities, the majority of the volcanic rock is calc-alkaline and can be defined in three main groups. 40 Ar/ 39 Ar data obtained from dacite, basalt and andesite rock groups within the KVC yield ages of between 13.5 and 15.5 Ma. Geochemical and petrographical data show that the andesitic rocks are products of homogeneous mixing between basic end-member magmas and dacitic magmas which are the products of partial melting of lower crustal compositions. Basaltic products of KVC are asthenospheric mantle derived, while dacitic and andesitic volcanic rocks are crustal origin. High Sr and Nd isotope ratios may indicate that andesitic and dacitic rocks originated from continental crust. The lithospheric mantle, which is subducting underneath the Anatolian plate, must have experienced slab break-off processes 13-15 million years ago and sunk into the asthenosphere. KVC were produced with the collision between Arabian and Anatolian Plates and related uplift of the East Anatolia region.

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The crustal structure of the East Anatolian plateau (Turkey) from receiver functions

Cited by 221 publications

References 18 publications

Crustal structure of the Arabian plate: new constraints from the analysis of teleseismic receiver functions

Crustal structure of the Arabian plate: new constraints from the analysis of teleseismic receiver functions

Geological evolution of Central Asian Basins and the western Tien Shan Range

Collision-related slab break-off volcanism in the Eastern Anatolia, Kepez volcanic complex (TURKEY)

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