The lithospheric structure of the Central and Southern Tien Shan: MTS data correlated with petrology and laboratory studies of lower-crust and upper-mantle xenoliths

Batalev, V. Yu.; Баталева, Е. А.; Egorova, V. V.; Matyukov, V. E.; Рыбин, А. В.

doi:10.1016/j.rgg.2011.11.005

Cited by 22 publications

(9 citation statements)

References 12 publications

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“…Морфология основных структурных элементов, выделенных в геофизических моделях, проявление морфоструктурных ансамблей и закономерности их размещения на различных пространственно-масштабных уровнях, а также поведение и взаимоотношение друг с другом границ и поверхностей раздела, характеризующих тектоническую расслоенность Тянь-Шаня, вызывают постоянный интерес научного сообщества. Современными исследованиями различных авторов установлены общие черты глубинного строения Центрального Тянь-Шаня, которые свидетельствуют о тектонической расслоенности [Makarov, 1977], наличии геофизических поверхностей раздела К0, К1, К2, М [Makarov et al, 2010;Sabitova, 1978;Sabitova et al, 2006;Yudakhin, 1983], поверхности Кюри [Pogrebnoi et al, 2009], существовании корового проводящего слоя [Batalev et al, 1989[Batalev et al, , 1993Rybin, , 2011Batalev, 2002;Bataleva, 2005;Bataleva et al, 2006;Trapeznikov et al, 1997]. Обобщения геолого-геофизических исследований для различных территорий Тянь-Шаня (рис.…”

Section: Figunclassified

“…Локальные волноводы обнаружены до глубины 20 км как в Чуйской впадине, так и под Киргизским хребтом. Некоторые из них хорошо коррелируют с проводящими зонами, которые установлены по результатам электромагнитных зондирований [Bragin, 2001;Batalev et al, 1989;Rybin et al, 2008]. Природа коровых волноводов, совпадающих с зонами повышенной электропроводности, может быть обусловлена высокой трещиноватостью среды и ее флюидонасыщенностью, что приводит к понижению скоростных свойств.…”

Section: сейсмические и сейсмологическиеunclassified

“…Общим для рассматриваемых тектонических сегментов является то, что наиболее ярко выраженные проводящие объекты геоэлектрических моделей, построенных по результатам магнитотеллурических зондирований [Batalev et al, 1989[Batalev et al, , 1993Bielinski et al, 2003;Bataleva et al, 2006Bataleva et al, , 2013Berdichevsky et al, 2010;Makarov et al, 2010;Rybin et al, 2008;Rybin, 2011;Trapeznikov et al, 1997], совпадают с низкодобротными зонами [Aptikaeva, 2018;Aptikaeva et al, 1996]. Это может свидетельствовать о флюидонасыщении выявленных проводников и волноводов литосферы Тянь-Шаня, поскольку низкоскоростные аномалии P-волн также соответствуют зонам низкой добротности.…”

Section: рисunclassified

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Volumetric and Spatial Segmentation of the Tien Shan Lithosphere According to Geophysical Data

Рыбин¹,

Баталева²,

Непеина³

et al. 2021

Geodin. tektonofiz.

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This article consolidates the results of studying the deep structure of the lithosphere of the Central Tien Shan, which aimed to identify the main tectonic elements in its geophysical models. We have compared the structural and geological data with the information on the deep structure obtained by geophysical methods and from the positions of earthquake hypocenters in the study area. According to geological concepts, the Tien Shan orogenic belt is characterized by longitudinal and transverse segmentation. The boundaries of the Northern, Middle, Southern Western and Eastern segments of the Tien Shan are deep-seated fault structures. In deep faults and channels of heat and mass transfer, endogenous processes are localized. High-velocity, geoelectrical and thermal models consider such faults and channels as contrasting objects that can be referred to as indicators of these processes.Our analysis of the locations of earthquake hypocenters from NNC, KNET, CAIIG, KRNET, SOME catalogues shows that seismic events are strongly confined to the fault zones and the boundaries of large blocks. A correlation between the anomalies of geophysical fields suggests the degree of inheritance of tectonic structures and the boundaries of the main tectonic segments of the Tien Shan. To compare the crustal and upper mantle heterogeneities reflected in different geophysical fields, we have analyzed seismic tomographic sections based on volumetric seismotomographic models geoelectric and velocity sections along profiles across the main tectonic elements of the study area. The sections are used to identify the zones with relatively low (i.e. reduced) seismic wave velocities and detect the deep-seated longitudinal segmentation of the folded belt. Objects showing anomalous seismic wave velocities are found in the seismotomographic sections at all the depths under consideration. The most contrasting differences in the velocities of P- and S-waves are typical of the depths of 0-5 km and 50-65 km, showing the most clearly observed Northern, Southern and Western segments of the Tien Shan. In general, the velocities of P- and S-waves at the Northern Tien Shan are higher than those at the Middle and Southern segments. We have analyzed the distribution of geoelectric heterogeneities identified from magnetotelluric sounding data in order to determine the boundaries of the main tectonic elements that are considered as the zones of increased electrical conductivity confined to the boundaries of the fault structures. The distribution of earthquake epicenters clearly reflects the segmentation of the Tien Shan into the Northern, Middle and Southern segments and shows the Western and Eastern Tien Shan relative to the Talas-Fergana fault. Ourstudies of the crust and the upper mantle of the Tien Shan have confirmed that the abovementioned tectonic segments have differences in their deep structures Based on a comprehensive analysis of the study results, we can qualitatively identify a relationship between the distribution of the velocity and geoelectric heterogeneities in the crust and upper mantle, seismicity and the stress-strain state of the crust.

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Section: Figunclassified

Section: сейсмические и сейсмологическиеunclassified

Section: рисunclassified

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Volumetric and Spatial Segmentation of the Tien Shan Lithosphere According to Geophysical Data

Рыбин¹,

Баталева²,

Непеина³

et al. 2021

Geodin. tektonofiz.

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“…The interpretation of a magnetotelluric sounding profile (Bagdasarov et al, 2011;Batalev et al, 2011) relies on the supposed thrusting of the folded struc tures of the Tian Shan over the lithosphere of the Tarim block. Two low resistivity zones were distin guished; one of them was identified as a paleosubduc tion zone extending north of the Naryn basin beneath the Kyrgyz Range, and the other, as a collision struc ture above the lithosphere of the Tarim block (such structures are traced over 200 km south of the Naryn basin).…”

Section: Manifestation Of the Lateral Change Of Magma Sources In The mentioning

confidence: 99%

Lateral change of sources for the Cretaceous-Paleogene magmatism of the Tian Shan

Rasskazov

Chuvashova

Mikolaichuk³

et al. 2015

Petrology

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The Southern and Northern-Central Tian Shan are sharply different in the character of the evo lution of Cretaceous-Paleogene magmatism. The Southern Tian Shan comprises a picrobasalt-trachyba salt-basanite-phonotephrite-phonolite volcanic series, which was formed over a considerable time interval from 122 to 46 Ma, whereas the Northern-Central Tian Shan hosts a foidite-basanite-trachybasalt-basaltbasaltic andesite volcanic association, which erupted within a rather narrow time interval between 61 and 53 Ma. The entire volcanic series of the former region was derived from a shallow garnet free mantle source. The volcanic assemblage of the latter region included basanites and foidites derived from a deep garnet bear ing mantle source, whereas trachybasalt, basalt, and basaltic andesite melts were generated in the lower crust. It is supposed that the change of sources and different evolutionary trends of Cretaceous-Paleogene magma tism in the Southern and Northern-Central Tian Shan were caused by the activation of the heterogeneous lithosphere beneath the converging shores of the Late Paleozoic Turkestan paleoocean.

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“…Recently, active source seismic studies have been resumed for the MANAS profile, which produced a great deal of information on the deep structure beneath the central and southern Tien Shan using several geophysical methods (Makarov et al, ). Mantle and crustal structures beneath the Tien Shan were also investigated using magnetotelluric methods by Bielinski et al (), Batalev et al (), and Batalev and Bataleva (), including the MANAS profile (Rybin, ).…”

Section: Introductionmentioning

confidence: 99%

Collisional Processes in the Crust of the Northern Tien Shan Inferred From Velocity and Attenuation Tomography Studies

et al. 2018

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Based on seismic data from existing seismic networks in Kyrgyzstan, we have constructed new crustal models of seismic velocity and attenuation for P and S wave s beneath the Kyrgyz Tien Shan. With data from more than 6,000 events recorded by the international KNET network, the most detailed structures were detected in the central‐northern part of the study region, where the Kazakh Shield collides with the northern Tien Shan. The independently computed 3‐D distributions of P and S wave attenuation show features that are consistent with the main structural elements. The high‐attenuation areas correspond to folded areas of the northern Tien Shan, whereas the partitions of the stable Kazakh Shield and the Issyk Kul block match with the low‐attenuation areas. The velocity model reveals some structures that help to determine the details of the collision processes in the northern Tien Shan. In the upper crust, we observe the alternation of several higher‐ and lower‐velocity anomalies that likely represent the interaction of brittle and ductile crustal layers of the collided Kazakh and Tien Shan plates. In deeper sections, both P and S wave velocity models show a prominent low‐velocity anomaly just beneath the northern boundary of Tien Shan. We propose that this anomaly represents an anomalous crustal thickening at the point of underthrusting of the Kazakh Plate beneath Tien Shan.

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The lithospheric structure of the Central and Southern Tien Shan: MTS data correlated with petrology and laboratory studies of lower-crust and upper-mantle xenoliths

Cited by 22 publications

References 12 publications

Volumetric and Spatial Segmentation of the Tien Shan Lithosphere According to Geophysical Data

Volumetric and Spatial Segmentation of the Tien Shan Lithosphere According to Geophysical Data

Lateral change of sources for the Cretaceous-Paleogene magmatism of the Tian Shan

Collisional Processes in the Crust of the Northern Tien Shan Inferred From Velocity and Attenuation Tomography Studies

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