Developments in Geochronology and Dating of Shear Zone Deformation

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Mineral Geochemistry and Geochronology".

Deadline for manuscript submissions: closed (28 February 2025) | Viewed by 774

Special Issue Editors


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Guest Editor
Instituto de Geociências, Universidade de São Paulo, São Paulo 05508-900, Brazil
Interests: geotectonics and geochronology; orogen; tectonics

E-Mail Website
Guest Editor
Instituto de Geociências, Universidade de São Paulo, São Paulo 05508-080, Brazil
Interests: geochronology; tectonics

Special Issue Information

Dear Colleagues,

Considerable advances in our understanding of crustal and tectonic evolution in modern geology have been made possible by the performance of detailed geochronology and isotope geochemistry. In recent decades, it has become evident that evolutionary models, which are foundational to such established geodynamic views, need to be constrained by the timing and rates of crustal deformation, itself mostly manifested by shear zones and shear zone networks. The task of determining the timing and duration of shear zone deformation is hindered greatly by unreliable dating systems, by complex deformation histories, and by uncertain field relations amongst the units used to characterize regional displacement structures. In recent years, a renewed interest in the application of multiple in situ mineral-dating techniques that are closely linked to deformation; this is in addition to traditional methods of indirectly constraining deformation timing. Additionally, the careful characterization of the textures of grain microstructures in conventional systems such as zircon has revealed complex zoning patterns related to deformation, and these can affect the ages obtained. Important contributions to the analysis of such problems are widely found in the literature, and this Special Issue of Minerals welcomes further studies by eminent researchers in the field. The added knowledge and evidence of such studies will enable us to determine the timing and duration of major deformation events that characterize regional structures in provinces worldwide. Thus, they are invaluable for continued improvements in our understanding of tectonic and crustal evolution.

Dr. Carlos Fernando Ávila
Prof. Dr. Marcos Egydio Silva
Guest Editors

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Keywords

  • shear zone
  • geochronology
  • in-situ dating techniques
  • deformation
  • tectonics

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Published Papers (1 paper)

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Research

23 pages, 8147 KiB  
Article
Thermochronology of the Kalba–Narym Batholith and the Irtysh Shear Zone (Altai Accretion–Collision System): Geodynamic Implications
by Alexey Travin, Mikhail Buslov, Nikolay Murzintsev, Valeriy Korobkin, Pavel Kotler, Sergey V. Khromykh and Viktor D. Zindobriy
Minerals 2025, 15(3), 243; https://doi.org/10.3390/min15030243 - 26 Feb 2025
Viewed by 410
Abstract
The granitoids of the Kalba–Narym batholith and the Irtysh shear zone (ISZ) are among the main geological features of the late Paleozoic Altai accretion–collision system (AACS) in Eastern Kazakhstan. Traditionally, it is believed that late Paleozoic strike-slip faults played a pivotal role at [...] Read more.
The granitoids of the Kalba–Narym batholith and the Irtysh shear zone (ISZ) are among the main geological features of the late Paleozoic Altai accretion–collision system (AACS) in Eastern Kazakhstan. Traditionally, it is believed that late Paleozoic strike-slip faults played a pivotal role at all stages of the development of the AACS, they were supposed to control deformation, magmatism, and ore deposits. This work is devoted to solving the problem of the tectonic evolution of the AACS based on the reconstruction of the thermal history of granitoids of the Kalba–Narym batholith in connection with the Chechek metamorphic dome structure, which is one of the highly metamorphosed blocks mapped within the ISZ. The new geological and geochronological data presented in this work allowed us to establish the sequence of formation of the Kalba–Narym granitoid batholith and link it with the evolution of the Irtysh shear zone (ISZ). It was revealed that in the late Carboniferous–early Permian (312–289 Ma), during the NE–SW compression, the Irtysh shear zone formed as a gently dipping thrust system into which gabbro of the Surov massif intruded. The combined manifestation of magmatic and tectonic processes caused the formation of tectonic mélange with cataclastic gabbro and metamorphic rocks of the Chechek metamorphic dome structure (312–289 Ma). Compression caused the formation of a cover-thrust structure. The thickening of the crust under the probable thermal action of the Tarim plume led to the formation of the early Permian Kalba–Narym batholith (297–284 Ma) within the Kalba–Narym terrane. Denudation of the orogen occurred before the Early Triassic (280–229 Ma). In this way the sequence of formation of the Kalba–Narym batholith and the ISZ is consistent with the concepts of the stages of plume-lithosphere interaction within the AACS under the influence of the late Carboniferous–early Permian Tarim igneous province, but in the cover-thrust tectonic setting. Full article
(This article belongs to the Special Issue Developments in Geochronology and Dating of Shear Zone Deformation)
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