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  4. 岩石圈演化国家重点实验室
U-Pb geochronology of zircon and rutile from the Kokchetav metamorphic belt, northern Kazakhstan, and its tectonic implications

文献类型：期刊论文

作者Zhang, Ru Y.1,2; Li, Xian-Hua3; Yui, Tzen-Fu4; Jahn, Bor-Ming2; Liou, Juhn G.1; Ling, Xiao-Xiao3
刊名EUROPEAN JOURNAL OF MINERALOGY
出版日期2016-11-01
卷号28期号:6页码:1203-1213
ISSN号0935-1221
关键词Sims Dating Geochronology Zircon Rutile Eclogite Whiteschist Kokchetav Uhp Metamorphic Belt Diamond Coesite Kazakhstan
DOI10.1127/ejm/2016/0028-2523
文献子类Article
英文摘要The Kokchetav ultrahigh-pressure (UHP) metamorphic belt, located in the western part of the Central Asia Orogenic Belt (CAOB), consists of a well-studied diamond-bearing western domain and a less well-known coesite-bearing domain. To better understand the time of subduction and exhumation of the eastern domain and the tectonic evolution of the entire Kokchetav microcontinent, we conducted SIMS U-Pb dating of zircon from eclogite and rutile from whiteschist of the eastern domain. We identified two types of zircon from the Kulet eclogite: type-I zircon grains possess a large, low-cathodoluminescence (CL) magmatic core with high Th/U ratios of 1.0-1.5, yielding a Proterozoic protolith age (1437 +/- 29 Ma), and a thin rim of intermediate or high-CL. Type-II zircon crystals are rounded to ovoid, and have very low Th/U ratios (<0.1-0.2), yielding two population ages (532 +/- 58 and 497 +/- 5 Ma), which we interpret as the ages of peak metamorphism and decompression metamorphism, respectively. Rutile separates from three samples of whiteschist have low Th/U ratios (<<0.1). U-Pb isotopic analyses yielded two ages (526 +/- 9 and 498 +/- 11 Ma), interpreted to represent two stages of retrograde metamorphism. Combined with geochronological data from the literature and our results indicate that UHP rocks from both the eastern and western domains represent Proterozoic protoliths, and that they were subjected to nearly coeval UHP metamorphism at 527-537 Ma, even though the two domains formed at different peak P-T conditions. Exhumation took place during 526-498 Ma for the eastern domain, comparable to the western domain (526-507 Ma). The UHP slabs were exhumed from depths of 100-200 km to a mid -crustal level over 20-25 My. The final suturing of the uplifted Kokchetav microcontinent against the Stepnyak paleo-island arc occurred at <= 500 Ma. Our new SIMS U-Pb age data and previous petrological and structural analyses provide new constraints on the metamorphism and tectonic evolution of the Kokchetav microcontinent, and on the continental history in the western part of the CAOB.
WOS关键词ASIAN OROGENIC BELT ; DIAMOND-BEARING ; TH-PB ; PRESSURE METAMORPHISM ; CONTINENTAL GROWTH ; COOLING HISTORY ; MASSIF ; ROCKS ; EXHUMATION ; AGE
WOS研究方向Mineralogy
语种英语
出版者E SCHWEIZERBARTSCHE VERLAGSBUCHHANDLUNG
WOS记录号WOS:000396181200012
资助机构NSF EAR (US)(0003355) ; Ministry of Science and Technology ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences of the National Natural Science Foundation of China(41222023) ; NSC-Taiwan (MOST-Taiwan)(NSC101-2116-M-002-003 ; NSC102-2116-M-002-031 ; MOST 104-2923-M-002-005) ; NSF EAR (US)(0003355) ; Ministry of Science and Technology ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences of the National Natural Science Foundation of China(41222023) ; NSC-Taiwan (MOST-Taiwan)(NSC101-2116-M-002-003 ; NSC102-2116-M-002-031 ; MOST 104-2923-M-002-005) ; NSF EAR (US)(0003355) ; Ministry of Science and Technology ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences of the National Natural Science Foundation of China(41222023) ; NSC-Taiwan (MOST-Taiwan)(NSC101-2116-M-002-003 ; NSC102-2116-M-002-031 ; MOST 104-2923-M-002-005) ; NSF EAR (US)(0003355) ; Ministry of Science and Technology ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences of the National Natural Science Foundation of China(41222023) ; NSC-Taiwan (MOST-Taiwan)(NSC101-2116-M-002-003 ; NSC102-2116-M-002-031 ; MOST 104-2923-M-002-005)
源URL[http://ir.iggcas.ac.cn/handle/132A11/36489]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Zhang, Ru Y.
作者单位1.Stanford Univ, Dept Geol Sci, Stanford, CA 94305 USA
2.Natl Taiwan Univ, Dept Geosci, Taipei 106, Taiwan
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.Acad Sinica, Inst Earth Sci, Taipei 11529, Taiwan
推荐引用方式
GB/T 7714		 Zhang, Ru Y.,Li, Xian-Hua,Yui, Tzen-Fu,et al. U-Pb geochronology of zircon and rutile from the Kokchetav metamorphic belt, northern Kazakhstan, and its tectonic implications[J]. EUROPEAN JOURNAL OF MINERALOGY,2016,28(6):1203-1213.
APA Zhang, Ru Y.,Li, Xian-Hua,Yui, Tzen-Fu,Jahn, Bor-Ming,Liou, Juhn G.,&Ling, Xiao-Xiao.(2016).U-Pb geochronology of zircon and rutile from the Kokchetav metamorphic belt, northern Kazakhstan, and its tectonic implications.EUROPEAN JOURNAL OF MINERALOGY,28(6),1203-1213.
MLA Zhang, Ru Y.,et al."U-Pb geochronology of zircon and rutile from the Kokchetav metamorphic belt, northern Kazakhstan, and its tectonic implications".EUROPEAN JOURNAL OF MINERALOGY 28.6(2016):1203-1213.

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来源：地质与地球物理研究所

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