Microstructural and compositional evolutions during transformation from biotite to berthierine: Implications for phyllosilicate alteration processes
文献类型：期刊论文
| 作者 | Xi, Jiaxin3,4,5; Yang, Yiping3,5; He, Hongping3,4,5; Xian, Harvang3,5; Tan, Wei3,5; Li, Rui1; Zhu, Jianxi3,4,5; Xu, Huifang2 |
| 刊名 | AMERICAN MINERALOGIST
 |
| 出版日期 | 2024-04-25 |
| 卷号 | 109期号:4页码:656-666 |
| 关键词 | HAADF-STEM EELS biotite berthierine twin alteration mechanism Minerals and Petrology: Honoring John Valley Isotopes |
| ISSN号 | 0003-004X |
| DOI | 10.2138/am-2023-8984 |
| 英文摘要 | The composition and microstructure of phyllosilicates are prone to transformation due to their great sensitivity to surrounding physicochemical changes. Berthierine [(R2+,R3+,)6(Si,Al)4O10(OH)8] ( represents octahedral vacancy) is a typical ferromagnesian phyllosilicate that commonly occurs in ferruginous rocks of shallow-marine habitats and has been used as an indicator of local depositional and/or hydrothermal activity in marine environments. However, little is known about the formation and mineralogy of non-marine berthierine, particularly in volcanic systems. Using high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), we have identified a berthierine twin structure within weakly altered biotite in a rhyolite from Long Valley, California, U.S.A. The presence of nanoscale Fe-rich layers in the host biotite is revealed by energy-dispersive spectroscopy and electron energy loss spectroscopy (EELS). The HAADF-STEM pictures with atomic resolution demonstrate that the Fe-rich layers are composed of twinning berthierine layers rather than a single chlorite layer. The transformation of biotite to berthierine requires the dissolution of a tetrahedral (T) layer and the introduction of a new TO (O represents octahedral sheet) structure into the biotite stacking sequence, resulting in substituting one biotite layer (i.e., TOT) with two twinning berthierine layers (i.e., TO-OT). Observations based on morphology indicate that the transformation began at biotite defect locations (such as screw dislocation, edge dislocation, and microcleavage fracture), concurrent with the rearrangement of metal cations. During the fluid alteration of biotite, berthierine was produced via an interface-coupled dissolution-reprecipitation process. The EELS analyses further demonstrate that the Fe-rich biotite promotes the production of berthierine as the principal alteration product in low-temperature environments. Additionally, this study suggests that the combination of HAADF-STEM and EELS is effective for identifying nanominerals and elucidating their formation and alteration mechanisms. |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:001191907900001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/77217]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 通讯作者 | He, Hongping |
| 作者单位 | 1.Inst Geochem, Chinese Acad Sci, Ctr Lunar & Planetary Sci, Guiyang 550081, Peoples R China 2.Univ Wisconsin Madison, Dept Geosci, 1215 West Dayton St, Madison, WI 53706 USA 3.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Guangzhou Inst Geochem, Chinese Acad Sci, CAS Key Lab Mineral & Metallogeny, Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xi, Jiaxin,Yang, Yiping,He, Hongping,et al. Microstructural and compositional evolutions during transformation from biotite to berthierine: Implications for phyllosilicate alteration processes[J]. AMERICAN MINERALOGIST,2024,109(4):656-666. |
| APA | Xi, Jiaxin.,Yang, Yiping.,He, Hongping.,Xian, Harvang.,Tan, Wei.,...&Xu, Huifang.(2024).Microstructural and compositional evolutions during transformation from biotite to berthierine: Implications for phyllosilicate alteration processes.AMERICAN MINERALOGIST,109(4),656-666. |
| MLA | Xi, Jiaxin,et al."Microstructural and compositional evolutions during transformation from biotite to berthierine: Implications for phyllosilicate alteration processes".AMERICAN MINERALOGIST 109.4(2024):656-666. |
入库方式： OAI收割
来源：广州地球化学研究所
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。