| Инд. авторы: | Glorie S., De Grave J., Buslov M.M., Elburg M.A., Stockli D.F., Gerdes A., Van den haute P. |
| Заглавие: | Multi-method chronometric constraints on the evolution of the Northern Kyrgyz Tien Shan granitoids (Central Asian Orogenic Belt): From emplacement to exhumation |
| Библ. ссылка: | Glorie S., De Grave J., Buslov M.M., Elburg M.A., Stockli D.F., Gerdes A., Van den haute P. Multi-method chronometric constraints on the evolution of the Northern Kyrgyz Tien Shan granitoids (Central Asian Orogenic Belt): From emplacement to exhumation // Journal of Asian Earth Sciences. - 2010. - Vol.38. - Iss. 3-4. - P.131-146. - ISSN 1367-9120. - EISSN 1878-5786. |
| Внешние системы: | DOI: 10.1016/j.jseaes.2009.12.009; РИНЦ: 15315151; SCOPUS: 2-s2.0-77249091684; |
| Реферат: | eng: Multichronological data reveal the thermotectonic history of the northern Kyrgyz Tien Shan granitoids (Kyrgyzstan) from emplacement to exhumation. Zircon SHRIMP and LA-ICP-MS U/Pb concordia ages suggest a Middle to Late Ordovician crystallization age (440-470 Ma) for the most voluminous; Caledonian intrusion phase, which is associated with the evolution and closure of the Early Palaeozoic Terskey Ocean. The presence of some additional Early Ordovician - Cambrian U/Pb ages point towards a prolonged production of granitoids during the entire Early Palaeozoic. A sampled younger granitoid (292 ± 5 Ma) was formed during the final closure of the Turkestan Ocean when Tarim eventually collided with the Kazakhstan plate during Hercynian orogeny. 40Ar/39Ar step-wise heating plateau-ages (biotite Ar/Ar: 400-440 Ma; K-feldspar Ar/Ar: 235-375 Ma) bear witness to rapid Silurian - Early Devonian post-magmatic cooling of the Caledonian intrusives, followed by a more modest rate of cooling during the Late Devonian until the Late Triassic. Low-temperature techniques such as apatite fission track (AFT) and Apatite (U-Th-Sm)/He (AHe) thermochronology, give Late Jurassic - Cretaceous ages (90-160 Ma) with some Cenozoic outliers. Thermal history modelling allows us to distinguish two marked cooling phases: (1) Mesozoic cooling occurred as the result of denudation and exhumation of the Tien Shan basement during a pulse of tectonic reactivation, associated with the Cimmerian orogeny. (2) Late Cenozoic cooling (∼10-3 Ma) reflects a far-field effect of the India-Eurasia collision. Some samples also experienced a Late Oligocene - Miocene reheating event, which could be the result of burial due to sediment load stripped from the adjacent, eroding mountain ranges. © 2009 Elsevier Ltd. All rights reserved.
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| Ключевые слова: | Kyrgyzstan; zircon; uranium-lead dating; thermochronology; SHRIMP dating; Paleozoic; orogenic belt; Ordovician; Oligocene; Miocene; mass spectrometry; inductively coupled plasma method; granitoid; Tien Shan; exhumation; emplacement; crystallization; argon-argon dating; apatite; Zircon U/Pb dating; Thermochronology; Kyrgyz Tien Shan; Central Asia; Ar/Ar dating; Apatite fission track dating; Apatite (U-Th-Sm)/He dating; fission track dating; |
| Издано: | 2010 |
| Физ. характеристика: | с.131-146 |