Multi-system geochronology of North Dabie eclogite: Ineffective garnet `shielding' on rutile inclusions under multi-thermal conditions
文献类型：期刊论文
| 作者 | Zhou, Tian2,4,5; Li, Qiuli2,4,5; Klemd, Reiner1; Shi, Yonghong3; Tang, Xu5; Li, Chaofeng4,5; Liu, Yu4,5 |
| 刊名 | LITHOS
 |
| 出版日期 | 2020-09-01 |
| 卷号 | 368页码:10 |
| ISSN号 | 0024-4937 |
| 关键词 | Shielding effect Ruble inclusions Secondary ion mass spectrometry U-Pb dating Transmission electron microscope |
| DOI | 10.1016/j.lithos.2020.105573 |
| 英文摘要 | It has been shown that certain host minerals can robustly shield mineral inclusions and prevent loss of petrochronological information during subsequent thermal events. Ruble indusions in garnet may crystallize under a wide range of metamorphic conditions and thus ruble is expected to be a useful geochronometer for constraining different stages of a metamorphic P-T path. Hence, it is important to ascertain whether rutile inclusions shielded by garnet retain the original crystallization age information despite later retrograde cooling or subsequent new thermal events. In this study, we test the "shielding effect" of garnet on rutile inclusions from the Baizhangya edogite in the North Dabie Zone (China), which underwent a multi-stage thermal evolution. Secondary ion mass spectrometry (SIMS) U-Pb dating of inherited zircon core domains constrains a Neoproterozoic formation age (similar to 770 Ma) of the eclogite protolith. SIMS U-Pb dating of metamorphic zircon and complementary thermal-ionization mass spectrometry (TIMS) Sm-Nd isochron dating of garnet revealed Triassic eclogitefacies metamorphic ages (245-210 Ma). An Early Cretaceous SIMS U-Pb age of ca. 130 Ma. yielded by matrix rutile grains and rutile inclusions, suggests significant isotopic alteration since crystallization. This indicates that shielding was ineffective, since the U-Pb ages derived from the rutile inclusions, although hermetically armored by garnet, were influenced by a subsequent Early Cretaceous tectono-thermal event. Further transmission electron microscope (TEM) analysis revealed the presence of hematite microlites along the garnet-rutile boundaries, which may have acted as a potential reservoir to store the expelled radiogenic Pb from Mile. This study suggests that newly formed minerals located along mineral boundaries seem to be crucial for understanding the shielding effect. (C) 2020 Elsevier B.V. All rights reserved. |
| WOS关键词 | U-PB AGES ; EAST-CENTRAL CHINA ; ULTRAHIGH-PRESSURE METAMORPHISM ; TRACE-ELEMENT ; SM-ND ; MONAZITE INCLUSIONS ; CONTINENTAL-CRUST ; COOLING HISTORY ; EDOUGH MASSIF ; ZIRCON AGES |
| 资助项目 | National Key Research and Development Program of China[2016YFE0203000] ; National Natural Science Foundation of China[41773044] ; National Natural Science Foundation of China[41673059] ; National Program for Support of Top-notch Young Professionals |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000541261600003 |
| 资助机构 | National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Program for Support of Top-notch Young Professionals ; National Program for Support of Top-notch Young Professionals ; National Program for Support of Top-notch Young Professionals ; National Program for Support of Top-notch Young Professionals ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Program for Support of Top-notch Young Professionals ; National Program for Support of Top-notch Young Professionals ; National Program for Support of Top-notch Young Professionals ; National Program for Support of Top-notch Young Professionals ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Program for Support of Top-notch Young Professionals ; National Program for Support of Top-notch Young Professionals ; National Program for Support of Top-notch Young Professionals ; National Program for Support of Top-notch Young Professionals ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Program for Support of Top-notch Young Professionals ; National Program for Support of Top-notch Young Professionals ; National Program for Support of Top-notch Young Professionals ; National Program for Support of Top-notch Young Professionals |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/97154]  |
| 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 | Li, Qiuli |
| 作者单位 | 1.Univ Erlangen Nurnberg, Schlossgarten 5a, D-91054 Erlangen, Germany 2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 3.Hefei Univ Technol, Sch Resources & Environm Engn, Hefei 230029, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 5.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhou, Tian,Li, Qiuli,Klemd, Reiner,et al. Multi-system geochronology of North Dabie eclogite: Ineffective garnet `shielding' on rutile inclusions under multi-thermal conditions[J]. LITHOS,2020,368:10. |
| APA | Zhou, Tian.,Li, Qiuli.,Klemd, Reiner.,Shi, Yonghong.,Tang, Xu.,...&Liu, Yu.(2020).Multi-system geochronology of North Dabie eclogite: Ineffective garnet `shielding' on rutile inclusions under multi-thermal conditions.LITHOS,368,10. |
| MLA | Zhou, Tian,et al."Multi-system geochronology of North Dabie eclogite: Ineffective garnet `shielding' on rutile inclusions under multi-thermal conditions".LITHOS 368(2020):10. |
入库方式： OAI收割
来源：地质与地球物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。