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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
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, Volume 38, No. 3-4, Year 2010
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Description
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.
Authors & Co-Authors
Glorie, S.
Belgium, Ghent
Universiteit Gent
de Grave, Johan
Belgium, Ghent
Universiteit Gent
Buslov, M. M.
Russian Federation, Novosibirsk
Siberian Branch, Russian Academy of Sciences
Elburg, Marlina A.
Belgium, Ghent
Universiteit Gent
Stockli, Daniel Fritz
United States, Lawrence
University of Kansas
Gerdes, A. G.
Unknown Affiliation
van den Haute, Peter
Belgium, Ghent
Universiteit Gent
Statistics
Citations: 213
Authors: 7
Affiliations: 3
Identifiers
Doi:
10.1016/j.jseaes.2009.12.009
ISSN:
13679120