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The growth interval of garnet in the UHP eclogites from the Dabie orogen, China

文献类型：期刊论文

作者Cheng, Hao1; Vervoort, Jeffrey D.2; Li, Xianhua3; Zhang, Chao1; Li, Qiuli3; Zheng, Shu4
刊名AMERICAN MINERALOGIST
出版日期2011-08-01
卷号96期号:8-9页码:1300-1307
关键词Garnet Lu-Hf U-Pb zircon
ISSN号0003-004X
DOI10.2138/am.2011.3737
文献子类Article
英文摘要Zircon inclusions, extracted from garnet from an ultrahigh-pressure eclogite in the eastern part of the Dabie orogen, were investigated with high spatial resolution U-Pb geochronology. The unzoned zircon rims have garnet and omphacite inclusions and show weak cathodoluminescence, low-Th/U ratios (0.02 0.18), flat high rare-earth elements patterns, and an absence of Eu anomalies, which suggest metamorphic growth in the presence of garnet and in the absence of feldspar. Dispersed concordia U-Pb ages, ranging from 205.1 +/- 3.3 to 255.3 +/- 6.1 Ma, defined a weighted mean Pb-206/U-238 age of 223 +/- 8 Ma (mean square of weighted deviation, MSWD = 38), which is significantly younger than the Lu-Hf garnet-whole rock age or 242.2 +/- 2.6 Ma. The U-Pb age probability distribution indicates two age populations at ca. 241 and ca. 216 Ma. The zircon rims, with younger ages, are distinguished from those with older ages by the occurrence of garnet and omphacite inclusions. Well-preserved prograde major- and trace-element zoning in garnet and the significant contribution of older garnet cores in bulk isotopic digestion suggest that the Lu-Hf age mostly reflects an early phase of garnet growth likely at amphibolite facies conditions. The new Lu-Hf age combined with the U-Pb ages of the zircon inclusions in garnet suggest that garnet growth was sustained over a time interval of similar to 25 m.y.
WOS关键词ULTRAHIGH-PRESSURE METAMORPHISM ; SUBDUCTED CONTINENTAL-CRUST ; COESITE-BEARING ECLOGITE ; SM-ND GEOCHRONOLOGY ; U-PB AGE ; LU-HF ; COOLING HISTORY ; SAMBAGAWA BELT ; COUNTRY ROCKS ; ZIRCON
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000293993500013
出版者MINERALOGICAL SOC AMER
资助机构Chinese Ministry of Science and Technology(2009CB825006) ; Chinese Ministry of Science and Technology(2009CB825006) ; National Natural Science Foundation of China(41073001 ; National Natural Science Foundation of China(41073001 ; NSF(EAR-0609856 ; NSF(EAR-0609856 ; Shanghai Rising-Star Program(10QA 1406800) ; Shanghai Rising-Star Program(10QA 1406800) ; 40973005) ; 40973005) ; EAR-0711280) ; EAR-0711280) ; Chinese Ministry of Science and Technology(2009CB825006) ; Chinese Ministry of Science and Technology(2009CB825006) ; National Natural Science Foundation of China(41073001 ; National Natural Science Foundation of China(41073001 ; NSF(EAR-0609856 ; NSF(EAR-0609856 ; Shanghai Rising-Star Program(10QA 1406800) ; Shanghai Rising-Star Program(10QA 1406800) ; 40973005) ; 40973005) ; EAR-0711280) ; EAR-0711280) ; Chinese Ministry of Science and Technology(2009CB825006) ; Chinese Ministry of Science and Technology(2009CB825006) ; National Natural Science Foundation of China(41073001 ; National Natural Science Foundation of China(41073001 ; NSF(EAR-0609856 ; NSF(EAR-0609856 ; Shanghai Rising-Star Program(10QA 1406800) ; Shanghai Rising-Star Program(10QA 1406800) ; 40973005) ; 40973005) ; EAR-0711280) ; EAR-0711280) ; Chinese Ministry of Science and Technology(2009CB825006) ; Chinese Ministry of Science and Technology(2009CB825006) ; National Natural Science Foundation of China(41073001 ; National Natural Science Foundation of China(41073001 ; NSF(EAR-0609856 ; NSF(EAR-0609856 ; Shanghai Rising-Star Program(10QA 1406800) ; Shanghai Rising-Star Program(10QA 1406800) ; 40973005) ; 40973005) ; EAR-0711280) ; EAR-0711280)
源URL[http://ir.iggcas.ac.cn/handle/132A11/74837]  
专题中国科学院地质与地球物理研究所
通讯作者Cheng, Hao
作者单位1.Tongji Univ, Sch Ocean & Earth Sci, State Key Lab Marine Geol, Shanghai 200092, Peoples R China
2.Washington State Univ, Sch Earth & Environm Sci, Pullman, WA 99164 USA
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
推荐引用方式
GB/T 7714		 Cheng, Hao,Vervoort, Jeffrey D.,Li, Xianhua,et al. The growth interval of garnet in the UHP eclogites from the Dabie orogen, China[J]. AMERICAN MINERALOGIST,2011,96(8-9):1300-1307.
APA Cheng, Hao,Vervoort, Jeffrey D.,Li, Xianhua,Zhang, Chao,Li, Qiuli,&Zheng, Shu.(2011).The growth interval of garnet in the UHP eclogites from the Dabie orogen, China.AMERICAN MINERALOGIST,96(8-9),1300-1307.
MLA Cheng, Hao,et al."The growth interval of garnet in the UHP eclogites from the Dabie orogen, China".AMERICAN MINERALOGIST 96.8-9(2011):1300-1307.

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来源：地质与地球物理研究所

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