| Инд. авторы: | Glorie S., De Grave J., Delvaux D., Buslov M.M., Zhimulev F.I., Vanhaecke F., Elburg M.A., Van Den haute P. |
| Заглавие: | Tectonic history of the Irtysh shear zone (NE Kazakhstan): New constraints from zircon U/Pb dating, apatite fission track dating and palaeostress analysis |
| Библ. ссылка: | Glorie S., De Grave J., Delvaux D., Buslov M.M., Zhimulev F.I., Vanhaecke F., Elburg M.A., Van Den haute P. Tectonic history of the Irtysh shear zone (NE Kazakhstan): New constraints from zircon U/Pb dating, apatite fission track dating and palaeostress analysis // Journal of Asian Earth Sciences. - 2012. - Vol.45. - P.138-149. - ISSN 1367-9120. - EISSN 1878-5786. |
| Внешние системы: | DOI: 10.1016/j.jseaes.2011.09.024; SCOPUS: 2-s2.0-84855189625; |
| Реферат: | eng: The Irtysh shear zone (ISZ) is an important structure in the framework of the Central Asian Orogenic Belt (CAOB). It represents the site of final collision of Kazakhstan with Siberia during Hercynian times and records up to 1000. km of lateral displacement during subsequent reorganization in the CAOB edifice. We present new zircon U/Pb, apatite fission track and fault kinematic data along the ISZ and consequently derived its tectonic history with emphasis on its formation and reactivation episodes. Carboniferous (~340-320. Ma) zircon U/Pb ages were obtained for the syn- and post-collisional Kalba-Narym intrusives, dating their emplacement in the framework of the Siberia-Kazakhstan collision. During this period, the ISZ experienced an 'early brittle' left-lateral, mainly transtensional stress regime. Late Carboniferous-Early Permian post-collisional intrusives were emplaced and the stress regime changed to a 'late brittle' regime, characterized by more compressional conditions, indicating rheological strengthening as a response to cessation of ductile shearing and cooling of the ISZ crust.Apatite fission track data and thermal history modeling reveal Late Cretaceous (~100-70. Ma) cooling of the ISZ basement rocks as a response to denudation of a bordering Late Mesozoic Altai orogen. After this denudation event, the tectonic activity ceased during the Late Mesozoic-Early Cenozoic. A final step of cooling (from ~25. Ma), exhibited by some of the thermal history models, may reflect reactivation of the ISZ and initiation of Cenozoic Altai mountain building. The Late Plio-Pleistocene phase of mountain building coincides with a new change in the Palaeostress field, characterized by minor transpressional, right-lateral shear conditions. © 2011 Elsevier Ltd.
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| Ключевые слова: | Kazakhstan; Altai Mountains; zircon; uranium-lead dating; thermochronology; tectonics; stress field; shear zone; paleostress; orogenic belt; fission track dating; fault propagation; emplacement; denudation; continental collision; basement rock; Zircon U/Pb dating; Palaeostress tensor inversion; Irtysh shear zone; Fault kinematics; Central Asian Orogenic Belt; Apatite fission track thermochronology; |
| Издано: | 2012 |
| Физ. характеристика: | с.138-149 |