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Petrographic, geochemical, and geochronological characteristics of metaplagiogranites from a high-pressure m acute accent elange in the Yuli belt, eastern Taiwan: Evidence for an early Miocene igneous precursor

文献类型：期刊论文

作者Lo, Wen-Han1; Tsai, Chin -Ho1; Chung, Sun-Lin2,4; Li, Xian-Hua3; Li, Qiu-Li3; Lee, Hao-Yang4; Lee, Chi-Yu2; Iizuka, Yoshiyuki4
刊名LITHOS
出版日期2022-11-01
卷号428页码:16
ISSN号0024-4937
关键词U-Pb zircon dating Metaigneous rock Magmatic age Forearc Subduction initiation Subduction erosion
DOI10.1016/j.lithos.2022.106829
英文摘要Glaucophane-bearing metaplagiogranite occurs among the high-pressure (HP) metamorphic rock types poorly exposed in the Yuli belt. This lithologic association has been interpreted as scattered fragments of a meta-morphosed ophiolite. Through field and petrographic investigations, we have identified several types of meta-plagiogranite in the Chinshuichi area. This study reports the first U-Pb zircon dates by secondary ion mass spectrometry (SIMS) and whole-rock geochemical characterization of these metaplagiogranitic samples and associated metagabbro. The newly-obtained U-Pb zircon dates of 17.4-16.9 Ma are interpreted as magmatic crystallization ages. The delta O-18 averages of the dated zircon grains are 3.9-5.0 parts per thousand for the metaplagiogranites and 4.9 parts per thousand for the metagabbro, implying that the ultimate source rocks were of mantle origin. These metaigneous rocks are characterized by negative niobium tantalum anomalies in whole-rock composition. Protoliths of these HP metaigneous rocks may have formed in a nascent forearc setting related to an early Miocene subduction initiation. This finding infers that HP metamorphism of the Chinshuichi plagiogranite was caused by subduction erosion, and challenges some previous models that commonly postulated the South China Sea origin for the metaophiolitic fragments of the Yuli belt.
WOS关键词GLAUCOPHANE-BEARING ROCKS ; SOUTH CHINA SEA ; U-PB ; OXYGEN ISOTOPES ; SUBDUCTION INITIATION ; ZIRCON MEGACRYSTS ; WORKING REFERENCE ; OCEANIC-CRUST ; ARC ; METAMORPHISM
资助项目Taiwan's Ministry of Science and Technology[109- 2116-M-259-001] ; Taiwan's Ministry of Science and Technology[110-2116-M-259-003]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
出版者ELSEVIER
WOS记录号WOS:000860509300001
资助机构Taiwan's Ministry of Science and Technology ; Taiwan's Ministry of Science and Technology ; Taiwan's Ministry of Science and Technology ; Taiwan's Ministry of Science and Technology ; Taiwan's Ministry of Science and Technology ; Taiwan's Ministry of Science and Technology ; Taiwan's Ministry of Science and Technology ; Taiwan's Ministry of Science and Technology
源URL[http://ir.iggcas.ac.cn/handle/132A11/108350]  
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Tsai, Chin -Ho
作者单位1.Natl Dong Hwa Univ, Dept Nat Resources & Environm Studies, Hualien 974, Taiwan
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 115, Taiwan
推荐引用方式
GB/T 7714		 Lo, Wen-Han,Tsai, Chin -Ho,Chung, Sun-Lin,et al. Petrographic, geochemical, and geochronological characteristics of metaplagiogranites from a high-pressure m acute accent elange in the Yuli belt, eastern Taiwan: Evidence for an early Miocene igneous precursor[J]. LITHOS,2022,428:16.
APA Lo, Wen-Han.,Tsai, Chin -Ho.,Chung, Sun-Lin.,Li, Xian-Hua.,Li, Qiu-Li.,...&Iizuka, Yoshiyuki.(2022).Petrographic, geochemical, and geochronological characteristics of metaplagiogranites from a high-pressure m acute accent elange in the Yuli belt, eastern Taiwan: Evidence for an early Miocene igneous precursor.LITHOS,428,16.
MLA Lo, Wen-Han,et al."Petrographic, geochemical, and geochronological characteristics of metaplagiogranites from a high-pressure m acute accent elange in the Yuli belt, eastern Taiwan: Evidence for an early Miocene igneous precursor".LITHOS 428(2022):16.

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来源：地质与地球物理研究所

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