Granitic protrusions in the structure of intraplate reactivation, southern Mongolia

Przhiyalgovsky, E. S.; Leonov, M. G.; Lavrushina, E. V.

doi:10.1134/s0016852114030054

Cited by 11 publications

(8 citation statements)

References 13 publications

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“…Около 50-80 % объема коры континентов занимают гранитоиды. В контексте обсуждаемого вопроса наиболее информативны средне-и крупнокристаллические калишпатовые и двуполевошпатовые граниты, которые во многом определяют структуру и реологию верхней коры (см., например [Areshev et al, 1997;Leonov, 2008;Leonov et al, 2018;Przhiyalgovsky et al, 2014;Sitdikova, Izotov, 2003;Foose, 1976]). В качестве примера рассмотрим строение двух гранитных массивов, а затем дадим обобщенную характеристику постмагматической инфраструктуры гранитных тел.…”

Section: постмагматическая деформация гранитовunclassified

Tectonics of rock loosening: geological data and physics of the process

Leonov

Кочарян

Ревуженко

et al. 2020

Geodin. tektonofiz.

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Block-granular geological objects and rock volumetric mobility indicators are described. The mechanisms of structural and material reworking of rocks are considered in relation to the formation of a discrete tectonic structure of rocks and changes in the shapes of the geological bodies, which take place without rupturing the rock surfaces bounding these bodies and provide for the volumetric tectonic flow of solid rocks. Based on the study of natural objects and their comparison with the theoretical and experimental data on solid mechanics and geomechanics, it is suggested that one of the triggers for the volumetric disintegration of rock masses is rock fatigue damage (a fundamental phenomenon of solid-state physics). The disintegrated rocks behave according to the laws of mechanics of granular materials and mesomechanics. This study is of both theoretical and pragmatic importance as it contributes to the understanding of the regional geological features and provides new knowledge on the formation of crystalline protrusions known among the main hydrocarbon reservoirs within the basements of various geologic structures.

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Section: постмагматическая деформация гранитовunclassified

Tectonics of rock loosening: geological data and physics of the process

Leonov

Кочарян

Ревуженко

et al. 2020

Geodin. tektonofiz.

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“…Детальное описание тектонической структуры центрального сегмента Гобийского Алтая (район хребтов Бага-Богдо и Ихэ-Богдо) (рис. 3) приведено в работах [Leonov, 2012b;Leonov et al, 2018;Przhiyalgovskii et al, 2011;Przhiyalgovsky et al, 2014].…”

Section: гобийский алтай (монголия)unclassified

“…В поперечном сечении зона имеет форму развернутого веера. Зоны испытали активизацию в позднекайнозойское время, соответствуют областям проявления левосдвиговой транспрессивно-транстенсивной тектоники (в том числе и на новейшем этапе) и образуют «структуры цветка» [Leonov, 2012b;Przhiyalgovskii et al, 2011;Przhiyalgovsky et al, 2014;Cunningham, 2010;Cunningham et al, 1996]. Таким образом, Гоби-Алтайская ветвь ГМЛ обладает всеми характерными чертами зон концентрированной деформации.…”

Section: гобийский алтай (монголия)unclassified

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Zones of concentrated deformation (flower structures): field observations and modeling data

Leonov

Морозов

Стефанов

et al. 2018

Geodin. tektonofiz.

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Our study was focused on narrow linear zones that penetrate to different depths the crust and have complex infrastructure. Rocks in such zones are more intensively tectonically altered in comparison with the background. ‘Flower structures’ and ‘zones of concentrated deformation’ (ZCD) are the terms to describe these zones. The field study results combined with the data of tectonophysical and computational modeling data and supplemented by the literature analysis gave grounds for the following conclusions. In the experiments, as well as in nature, ZCDs show similar and, in some cases, identical morphological and infrastructural features and have similar stages of their evolution. A ZCD is mainly a reflection of the transpression setting. Its formation is accompanied by 3D plastic shear flow of matter and dilatancy of the deformed volume. A ZCD may be associated with the development of the ‘basement – cover’ system. It may also occur due to the intra-cover tectogenesis that does not influence the basement. Locations of ZCDs are spatially regular and predetermine the tectonic divisibility of the crust and lithosphere.

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“…The SSZ was investigated from different aspects of geology in the recent years but there are many unresolved issues; For example from the aspect of protrusive piercing bodies that is a fascinating emplacement mechanism of granitic bodies reported from different parts of the orogenic systems around the world [40]. Also from another important aspect of tectonic activities in the context of exhumation of intrusive bodies that is poorly understood.…”

Section: Introductionmentioning

confidence: 99%

Transpression and Exhumation of Granitoid Plutons along the Northern Part of the Nehbandan Fault System in the Sistan Suture Zone, Eastern Iran

et al. 2020

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Geometry and kinematics of deformation across the Nehbandan Fault System (NFS) have been studied in the Bibimaryam and Damdameh areas in the Sistan Suture zone (SSZ). Nearly vertical fault planes with sub-horizontal lineations and correlation of these faults analysis with anisotropy of magnetic susceptibility (AMS) indicates a predominantly transpressive regime including right-lateral strike-slip faults with reverse components in the region. An assemblage of en-echelon and doubly plunging folds with slip indicators, such as duplexes in their limbs, confirms progressive transpressive deformation. Accompanying hydrothermal alteration has created ideal conditions for reactivating shear fractures during late Cenozoic times that record the last phase of tectonic activity. Intrusive bodies such as the Bibimaryam and Damdameh granitoid plutons are exposed along the NW-SE faults that branch off the Nehbandan Fault System (NFS). Fault analysis there shows three directions for compression (σ 1 ): N085°, N074°, and N024° from the Late Cretaceous to the Plio-Quaternary respectively, on the borders of the NFS. Our results are consistent with recent paleostress studies, which revealed counterclockwise rotation of σ 1 during the Late Cenozoic in eastern Iran. Redistribution of σ 1 directions along the NFS in the context of general N-S striking indicates a decreasing pure shear component, and consequently an increasing simple shear component from the Late Cretaceous to Plio-Quaternary. This reconfiguration of σ 1 likely triggered the exhumation of the Tertiary Bibimaryam and Damdameh granitoid plutons along the fault zones. Field evidence and lithofacies indicate that exhumation of the intrusive bodies cannot have preceded the late Eocene. Hence, the late Cenozoic uplift and exhumation of the Sistan Belt may largely have resulted from the development of a dextral transpressive regime along the NFS in the SSZ.

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Granitic protrusions in the structure of intraplate reactivation, southern Mongolia

Cited by 11 publications

References 13 publications

Tectonics of rock loosening: geological data and physics of the process

Tectonics of rock loosening: geological data and physics of the process

Zones of concentrated deformation (flower structures): field observations and modeling data

Transpression and Exhumation of Granitoid Plutons along the Northern Part of the Nehbandan Fault System in the Sistan Suture Zone, Eastern Iran

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