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Zircon U-Pb dating of eclogite from the Qiangtang terrane, north-central Tibet: a case of metamorphic zircon with magmatic geochemical features

文献类型：期刊论文

作者Zhai, Qing-guo1; Jahn, Bor-ming2; Li, Xian-hua3; Zhang, Ru-yuan2; Li, Qiu-li3; Yang, Ya-nan3; Wang, Jun1; Liu, Tong3; Hu, Pei-yuan1; Tang, Suo-han1
刊名INTERNATIONAL JOURNAL OF EARTH SCIENCES
出版日期2017-06-01
卷号106期号:4页码:1239-1255
ISSN号1437-3254
关键词Tibet Qiangtang Eclogite Oceanic Derivation Zircon Origin Rutile U-pb Dating
DOI10.1007/s00531-016-1418-9
文献子类Article
英文摘要Zircon is probably the most important mineral used in the dating formation of high-pressure (HP) and ultrahigh-pressure (UHP) metamorphic rocks. The origin of zircon, i.e., magmatic or metamorphic, is commonly assessed by its external morphology, internal structure, mineral inclusions, Th/U ratios and trace element composition. In this study, we present an unusual case of metamorphic zircon from the Qiangtang eclogite, north-central Tibet. The zircon grains contain numerous eclogite-facies mineral inclusions, including omphacite, phengite, garnet and rutile; hence, they are clearly of metamorphic origin. However, they display features similar to common magmatic zircon, including euhedral crystal habit, high Th/U ratios and enriched heavy rare earth elements pattern. We suggest that these zircon grains formed from a different reservoir from that for garnet where no trace elements was present and trace element equilibrium between zircon and garnet was achieved. U-Pb dating of zircon gave an age of 232-237 Ma for the eclogite, and that of rutile yielded a slightly younger age of ca. 217 Ma. These ages are consistent with the reported Lu-Hf mineral isochron and phengite Ar-Ar ages. The zircon U-Pb and mineral Lu-Hf isochron ages are interpreted as the time of the peak eclogite-facies metamorphism, whereas the rutile U-Pb and phengite Ar-Ar ages represent the time of exhumation to the middle crust. Thus, the distinction between metamorphic and magmatic zircons cannot be made using only Th/U ratios and heavy REE compositions for HP-UHP metamorphic rocks of oceanic derivation.
WOS关键词ULTRAHIGH-PRESSURE METAMORPHISM ; CONTINENTAL SUBDUCTION ZONES ; HF ISOTOPIC CHARACTERISTICS ; PALEO-TETHYS OCEAN ; TRACE-ELEMENT ; TH-PB ; TRIASSIC SUBDUCTION ; MICROPROBE ANALYSES ; COOLING HISTORY ; DABIE MOUNTAINS
WOS研究方向Geology
语种英语
出版者SPRINGER
WOS记录号WOS:000401629200005
资助机构Ministry of Science and Technology of China(2016YFC0600304) ; National Natural Science Foundation of China(41522204 ; Chinese Geological Survey Project(DD20160123-05) ; National Science Council (Taiwan)(NSC 100-2116-M-002-024) ; 41502216) ; Ministry of Science and Technology of China(2016YFC0600304) ; National Natural Science Foundation of China(41522204 ; Chinese Geological Survey Project(DD20160123-05) ; National Science Council (Taiwan)(NSC 100-2116-M-002-024) ; 41502216) ; Ministry of Science and Technology of China(2016YFC0600304) ; National Natural Science Foundation of China(41522204 ; Chinese Geological Survey Project(DD20160123-05) ; National Science Council (Taiwan)(NSC 100-2116-M-002-024) ; 41502216) ; Ministry of Science and Technology of China(2016YFC0600304) ; National Natural Science Foundation of China(41522204 ; Chinese Geological Survey Project(DD20160123-05) ; National Science Council (Taiwan)(NSC 100-2116-M-002-024) ; 41502216)
源URL[http://ir.iggcas.ac.cn/handle/132A11/52948]  
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Zhai, Qing-guo
作者单位1.Chinese Acad Geol Sci, Inst Geol, 26 Baiwanzhuang Rd, Beijing 100037, Peoples R China
2.Natl Taiwan Univ, Dept Geosci, Taipei 106, Taiwan
3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Zhai, Qing-guo,Jahn, Bor-ming,Li, Xian-hua,et al. Zircon U-Pb dating of eclogite from the Qiangtang terrane, north-central Tibet: a case of metamorphic zircon with magmatic geochemical features[J]. INTERNATIONAL JOURNAL OF EARTH SCIENCES,2017,106(4):1239-1255.
APA Zhai, Qing-guo.,Jahn, Bor-ming.,Li, Xian-hua.,Zhang, Ru-yuan.,Li, Qiu-li.,...&Tang, Suo-han.(2017).Zircon U-Pb dating of eclogite from the Qiangtang terrane, north-central Tibet: a case of metamorphic zircon with magmatic geochemical features.INTERNATIONAL JOURNAL OF EARTH SCIENCES,106(4),1239-1255.
MLA Zhai, Qing-guo,et al."Zircon U-Pb dating of eclogite from the Qiangtang terrane, north-central Tibet: a case of metamorphic zircon with magmatic geochemical features".INTERNATIONAL JOURNAL OF EARTH SCIENCES 106.4(2017):1239-1255.

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来源：地质与地球物理研究所

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