Geologically Meaningful(4) Ar-0/Ar-39 Ages of Altered Biotite from a Polyphase Deformed Shear Zone Obtained by in Vacuo Step-Heating Method: A Case Study of the Waziyu Detachment Fault, Northeast China
文献类型：期刊论文
| 作者 | Shi, Wenbei1,2; Wang, Fei1,2,3,5; Wu, Lin1,2; Yang, Liekun1,2; Wang, Yinzhi1,2; Shi, Guanghai4 |
| 刊名 | MINERALS
 |
| 出版日期 | 2020-08-01 |
| 卷号 | 10期号:8页码:19 |
| 关键词 | Waziyu detachment fault epidotization biotite Ar-40/Ar-39 dating |
| DOI | 10.3390/min10080648 |
| 英文摘要 | Discordant biotite Ar-40/Ar-39 age spectra are commonly reported in the literature. These can be caused by a number of processes related to in vacuo heating, homogenization of the argon distribution, and production of misleadingly flat age spectra. Problematic samples are typically derived from metamorphic belts; thermal overprinting and chloritization are two of the main known causes of disturbed age spectra. Biotite and muscovite of the Waziyu detachment fault, Yiwulushan metamorphic core complex, Jinzhou, China, yield highly variable Ar-40/Ar-39 data that hinder reconstruction of their deformation history. We combined mineralogical studies with detailed Ar-40/Ar-39 dating of biotite, phengitic white mica, and K-feldspar augen from this fault. We infer that argon within the biotite was modified by hydrothermal fluids during fault activity and associated epidotization, chloritization, and muscovitization such that bulk sample step-heating, single grain total fusion, and in situ laser ablation of biotite produced mixed Ar-40/Ar-39 ages. However, detailed step-heating of biotite shows that this mineral records the ages of cooling and later alteration based on data from a coexisting rigid feldspar porphyroblast and neo-crystallized phengite that record two periods of fault activity at similar to 120-113 and 18-12 Ma. Our data reveal that the discordant biotite Ar-40/Ar-39 age spectra might represent a mixed age and that only detailed step-heating methods can extract meaningful geological details of the deformation history of a fault. Therefore, the mineral and the method must be carefully considered if metamorphic or deformed samples are dated. |
| WOS关键词 | HIGH-TEMPERATURE ; DIFFUSION ; YIWULUSHAN ; PRESSURE ; COMPLEX ; MICAS ; THERMOCHRONOMETRY ; GEOCHRONOLOGY ; CONSTRAINTS ; HORNBLENDE |
| 资助项目 | Ministry of Science and Technology of the People's Republic of China[2016YFC0600109] ; National Natural Science Foundation of China[41903050] ; National Natural Science Foundation of China[41673015] ; Institute of Geology and Geophysics, Chinese Academy of Science[T201904] |
| WOS研究方向 | Mineralogy ; Mining & Mineral Processing |
| 语种 | 英语 |
| WOS记录号 | WOS:000564804600001 |
| 出版者 | MDPI |
| 资助机构 | Ministry of Science and Technology of the People's Republic of China ; Ministry of Science and Technology of the People's Republic of China ; Ministry of Science and Technology of the People's Republic of China ; Ministry of Science and Technology of the People's Republic 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 ; Institute of Geology and Geophysics, Chinese Academy of Science ; Institute of Geology and Geophysics, Chinese Academy of Science ; Institute of Geology and Geophysics, Chinese Academy of Science ; Institute of Geology and Geophysics, Chinese Academy of Science ; Ministry of Science and Technology of the People's Republic of China ; Ministry of Science and Technology of the People's Republic of China ; Ministry of Science and Technology of the People's Republic of China ; Ministry of Science and Technology of the People's Republic 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 ; Institute of Geology and Geophysics, Chinese Academy of Science ; Institute of Geology and Geophysics, Chinese Academy of Science ; Institute of Geology and Geophysics, Chinese Academy of Science ; Institute of Geology and Geophysics, Chinese Academy of Science ; Ministry of Science and Technology of the People's Republic of China ; Ministry of Science and Technology of the People's Republic of China ; Ministry of Science and Technology of the People's Republic of China ; Ministry of Science and Technology of the People's Republic 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 ; Institute of Geology and Geophysics, Chinese Academy of Science ; Institute of Geology and Geophysics, Chinese Academy of Science ; Institute of Geology and Geophysics, Chinese Academy of Science ; Institute of Geology and Geophysics, Chinese Academy of Science ; Ministry of Science and Technology of the People's Republic of China ; Ministry of Science and Technology of the People's Republic of China ; Ministry of Science and Technology of the People's Republic of China ; Ministry of Science and Technology of the People's Republic 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 ; Institute of Geology and Geophysics, Chinese Academy of Science ; Institute of Geology and Geophysics, Chinese Academy of Science ; Institute of Geology and Geophysics, Chinese Academy of Science ; Institute of Geology and Geophysics, Chinese Academy of Science |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/97786]  |
| 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 | Shi, Wenbei |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China 3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 4.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China 5.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Shi, Wenbei,Wang, Fei,Wu, Lin,et al. Geologically Meaningful(4) Ar-0/Ar-39 Ages of Altered Biotite from a Polyphase Deformed Shear Zone Obtained by in Vacuo Step-Heating Method: A Case Study of the Waziyu Detachment Fault, Northeast China[J]. MINERALS,2020,10(8):19. |
| APA | Shi, Wenbei,Wang, Fei,Wu, Lin,Yang, Liekun,Wang, Yinzhi,&Shi, Guanghai.(2020).Geologically Meaningful(4) Ar-0/Ar-39 Ages of Altered Biotite from a Polyphase Deformed Shear Zone Obtained by in Vacuo Step-Heating Method: A Case Study of the Waziyu Detachment Fault, Northeast China.MINERALS,10(8),19. |
| MLA | Shi, Wenbei,et al."Geologically Meaningful(4) Ar-0/Ar-39 Ages of Altered Biotite from a Polyphase Deformed Shear Zone Obtained by in Vacuo Step-Heating Method: A Case Study of the Waziyu Detachment Fault, Northeast China".MINERALS 10.8(2020):19. |
入库方式： OAI收割
来源：地质与地球物理研究所
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