Cenozoic history of topography in southeastern Gorny Altai: thermochronology and resistivity and gravity records

Добрецов, Н Л; Буслов, М. М.; Vasilevsky, Alexander; Ветров, Е.В.; Неведрова, Н Н

doi:10.1016/j.rgg.2016.10.001

Cited by 30 publications

(9 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Курайская и Чуйская межгорные впадины по данным спутниковых гравиметрических миссий являются изостатически нескомпенсированными, что может быть связано с составом и структурой верхней части разреза долин. Современные модели гравитационного поля активно и плодотворно применяются в геологических построениях [Dobretsov et al, 2016[Dobretsov et al, , 2017[Dobretsov et al, , 2021, при этом в основном используются построения в редукции Фая, хорошо отражающие морфологию региона. Нами в настоящей работе для изучения границы Мохо использована редукция Буге, поле при этом плавно изменяется с севера на юг с исключением влияния небольших приповерхностных геологических структур.…”

Section: заключениеunclassified

Deep Structure of the Altai Mountains and Modern Gravity Field Models

Timofeev

Ardyukov

Goldobin

et al. 2023

Geodin. tektonofiz.

View full text Add to dashboard Cite

The results of the ground-based absolute gravity and space geodetic measurements for the Altai Mountains were considered in combination with EIGEN-6C4 Global Geopotential Model (ETOPO1 Global Relief Model) generated from the satellite data. Analysis was made on different kinds of data: model values for the vertical component of gravity, values of Bouguer and Faye gravity reductions, variations of the vertical gravity gradient, and changes in altitude of the measurement sites. With EIGEN-6C4 model for Bouguer reduction, the crustal thickness curve was drawn along the Novosibirsk (southern West Siberia) – Ukok Plateau (Altai Mountains) line with a length of 800 km. The Moho depth increases from 40 km in the northwest of the area to 51 km in the southeast. For the homogeneous crust model, there was obtained the Moho depth distribution in the Altai Mountains and their foothills.The analysis of the results of modeling Bouguer and Faye reductions, the data on quasigeoid heights and the relationship between relief height and Bouguer anomalies implies that the Altai Mountains area as a whole is isostatically compensated. Non-compensated are some intermountain basins, such as, for example, the Kurai and Chuya valleys.

show abstract

Section: заключениеunclassified

Deep Structure of the Altai Mountains and Modern Gravity Field Models

Timofeev

Ardyukov

Goldobin

et al. 2023

Geodin. tektonofiz.

View full text Add to dashboard Cite

show abstract

“…The considered part of the of South Siberia mountains encompasses the mountain systems of the Altai, Western and Eastern Sayan, and the Baikal rift depression. The formation of the Cenozoic structure of this region developed under the influence of the Indo-Eurasian collision, accompanied by the transfer of deformations over long distances through the rigid structures of the Precambrian microcontinent located among the Paleozoic-Mesozoic folded zones [Dobretsov et al, 1995[Dobretsov et al, , 2016Buslov et al, 2008Buslov et al, , 2013. The tectonic structures of Altai and Sayan were formed as a result of the Hercynian and Caledonian folding, and the formation of the recent relief took place in the Late Cenozoic in the Oligocene-Quaternary time during 5-3 million years [Buslov et al, 2008;Dergunov, 1989].…”

Section: Morphostructural Zoning Of the Altai-sayan-baikal Regionmentioning

confidence: 99%

“…The tectonic structures of Altai and Sayan were formed as a result of the Hercynian and Caledonian folding, and the formation of the recent relief took place in the Late Cenozoic in the Oligocene-Quaternary time during 5-3 million years [Buslov et al, 2008;Dergunov, 1989]. In the tectonic structure of the region, an important role is played by the Paleozoic and Mesozoic faults, renewed in the Cenozoic time [Dergunov, 1989;Dobretsov et al, 1995Dobretsov et al, , 2016. These faults determine the block structure of the basement, which is clearly expressed in the morphostructure of the study region [Novikov, 2004].…”

Section: Morphostructural Zoning Of the Altai-sayan-baikal Regionmentioning

confidence: 99%

“…on the magnetic field anomalies is the digital map that was recently prepared under the World Digital Magnetic Anomaly Map (WDMAM) international scientific project [Dyment et al, 2015]. The WD-MAM map is represented in the form of the grid data with the resolution of 3 arc min over the entire surface of the Earth, which determine the intensity of the magnetic anomalies at a height of 5 km above the new World Geodetic System (WGS84) ellipsoid for the continental part and at sea level for the oceanic regions.…”

Section: Objects Of Recognition and Characteristics Describing Themmentioning

confidence: 99%

See 1 more Smart Citation

Recognition of earthquake-prone areas in the Altai-Sayan-Baikal region based on the morphostructural zoning

Gorshkov¹,

Soloviev²

2021

Russ. J. Earth Sci.

View full text Add to dashboard Cite

The goal of the study is to identify the possible locations of strong M6+ earthquakes in the Altai-Sayan-Baikal region. The first stage of the study is compiling the morphostructural map of the region by means of the morphostructural zoning method (MSZ). The map presents the hierarchical block structure of the region, the network of morphostructural lineaments bounding the blocks, and loci of the nodes forming around lineament intersections. Epicenters of M6+ earthquakes reported by earthquake catalogues nucleate at nodes. We apply the pattern recognition approach to identify among all nodes seismogenic nodes D capable of generating M6+ earthquakes. This is done based on the description of the nodes by a set of geological and geophysical characteristics measured uniformly for all nodes. The result of the pattern recognition is twofold: (i) the rule of recognition that allows to recognize D nodes among the whole set of nodes; (ii) the actual division of nodes according to this rule into separate two classes: seismogenic D nodes and N nodes where the target events are unlikely. In the region under consideration, the whole set of 97 nodes has been divided into 33 D nodes and 64 N nodes. The target earthquakes have not yet been recorded at 17 D nodes indentified in this work. These susceptible nodes are located on the high rank lineaments separating major morphostructures of the region. High seismic potential of some of such nodes is confirmed by paleoseismic features defined in the region by other researchers.

show abstract

“…-в Курайской, поскольку эпицентральная область захватила обе эти впадины и их горное обрамление. Землетрясение сопровождается длительным и сложным афтершоковым процессом с периодами затиший и активизаций [Nevedrova et al, 2017;Dobretsov et al, 2016;Lunina et al, 2008]. В результате анализа накопленных сейсмологических данных были выделены зоны концентрации сейсмических событий в Курайской впадине на границе южного горного обрамления.…”

Section: Introductionunclassified

Block Structure of the Southern Kurai Basin of Gorny Altai According to Geoelectric Data Compared to the Distribution of Earthquake Epicenters

Санчаа

Неведрова

Пономарев

2019

Geodin. tektonofiz.

View full text Add to dashboard Cite

The Kurai Basin of Gorny Altai is located in the area of high seismic activity, which is involved in the focal zone of the 2003 M7.3 Chuya earthquake. Its aftershock process has not ceased yet, and shows the likelihood of major seismic events. The seismic monitoring records of the last 15 years after the devastating earthquake show the state of stress in the basin. A comprehensive field database has been consolidated from the studies of direct and alternating currents by electromagnetic methods, including transient electromagnetic sounding, vertical electrical sounding, and electric field tomography. Using a combination of the research techniques and the method of interpretation based on data inversion, it becomes possible to select optimal models, ensure higher reliability, and improve the contents of the study. The available seismological data are used to identify the zones of concentration of seismic events in the southern mountain frame of the Kurai Basin. Our study aims to determine and clarify the geoelectric structure of the southern troughs. The first section of the Southwestern trough is constructed, and the latitudinal fault boundaries of the Eshtykel graben are confirmed. A comparison of electromagnetic and seismic data for 2015 shows that the earthquake epicenters were mainly confined to the submeridional fault zones. In our study of the Southwestern trough, it is established that most of the earthquakes concentrated in active fault structures separating the blocks of varying depths, which are identified from the geoelectric data. The southern piedmont troughs of the Kurai Basin are cut by numerous faults of latitudinal and submeridional strikes.

show abstract

Cenozoic history of topography in southeastern Gorny Altai: thermochronology and resistivity and gravity records

Cited by 30 publications

References 21 publications

Deep Structure of the Altai Mountains and Modern Gravity Field Models

Deep Structure of the Altai Mountains and Modern Gravity Field Models

Recognition of earthquake-prone areas in the Altai-Sayan-Baikal region based on the morphostructural zoning

Block Structure of the Southern Kurai Basin of Gorny Altai According to Geoelectric Data Compared to the Distribution of Earthquake Epicenters

Contact Info

Product

Resources

About