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  2. 地质与地球物理研究所
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  4. 中国科学院地球与行星物理重点实验室
Classification of a Complexly Mixed Magnetic Mineral Assemblage in Pacific Ocean Surface Sediment by Electron Microscopy and Supervised Magnetic Unmixing

文献类型：期刊论文

作者Li, Jinhua1,3,4,5; Liu, Yan1,3,4,5; Liu, Shuangchi1,3; Roberts, Andrew Philip2; Pan, Hongmiao4,6; Xiao, Tian4,6; Pan, Yongxin1,3,4,5
刊名FRONTIERS IN EARTH SCIENCE
出版日期2020-12-22
卷号8页码:18
关键词marine sediments magnetic minerals environmental magnetism magnetic techniques transmission electron microscopy magnetofossils titanomagnetite
DOI10.3389/feart.2020.609058
英文摘要Unambiguous magnetic mineral identification in sediments is a prerequisite for reconstructing paleomagnetic and paleoenvironmental information from environmental magnetic parameters. We studied a deep-sea surface sediment sample from the Clarion Fracture Zone region, central Pacific Ocean, by combining magnetic measurements and scanning and transmission electron microscopic analyses. Eight titanomagnetite and magnetite particle types are recognized based on comprehensive documentation of crystal morphology, size, spatial arrangements, and compositions, which are indicative of their corresponding origins. Type-1 particles are detrital titanomagnetites with micron- and submicron sizes and irregular and angular shapes. Type-2 and -3 particles are well-defined octahedral titanomagnetites with submicron and nanometer sizes, respectively, which are likely related to local hydrothermal and volcanic activity. Type-4 particles are nanometer-sized titanomagnetites hosted within silicates, while type-5 particles are typical dendrite-like titanomagnetites that likely resulted from exsolution within host silicates. Type-6 particles are single domain magnetite magnetofossils related to local magnetotactic bacterial activity. Type-7 particles are superparamagnetic magnetite aggregates, while Type-8 particles are defect-rich single crystals composed of many small regions. Electron microscopy and supervised magnetic unmixing reveal that type-1 to -5 titanomagnetite and magnetite particles are the dominant magnetic minerals. In contrast, the magnetic contribution of magnetite magnetofossils appears to be small. Our work demonstrates that incorporating electron microscopic data removes much of the ambiguity associated with magnetic mineralogical interpretations in traditional rock magnetic measurements.
WOS关键词DEEP-SEA SEDIMENTS ; REVERSAL CURVE DIAGRAMS ; REMANENCE ACQUISITION EFFICIENCY ; ORGANIC-CARBON FLUX ; BACTERIAL MAGNETITE ; FERROMAGNETIC-RESONANCE ; MAGNETOTACTIC BACTERIA ; BIOGENIC MAGNETITE ; GRAIN-SIZE ; ENVIRONMENTAL MAGNETISM
资助项目National Natural Science Foundation of China[41920104009] ; National Natural Science Foundation of China[41890843] ; National Natural Science Foundation of China[41621004] ; Australian Research Council[DP160100805] ; Australian Research Council[DP200100765] ; Senior User Project[RVKEXUE2019GZ06]
WOS研究方向Geology
语种英语
出版者FRONTIERS MEDIA SA
WOS记录号WOS:000604602600001
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Australian Research Council ; Australian Research Council ; Senior User Project ; Senior User Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Australian Research Council ; Australian Research Council ; Senior User Project ; Senior User Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Australian Research Council ; Australian Research Council ; Senior User Project ; Senior User Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Australian Research Council ; Australian Research Council ; Senior User Project ; Senior User Project
源URL[http://ir.iggcas.ac.cn/handle/132A11/99948]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Li, Jinhua
作者单位1.Chinese Acad Sci, Innovat Acad Earth Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
2.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
4.CNRS CAS, Int Associated Lab Evolut & Dev Magnetotact Multi, Beijing, Peoples R China
5.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China
6.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Ecol & Environm Sci, Qingdao, Peoples R China
推荐引用方式
GB/T 7714		 Li, Jinhua,Liu, Yan,Liu, Shuangchi,et al. Classification of a Complexly Mixed Magnetic Mineral Assemblage in Pacific Ocean Surface Sediment by Electron Microscopy and Supervised Magnetic Unmixing[J]. FRONTIERS IN EARTH SCIENCE,2020,8:18.
APA Li, Jinhua.,Liu, Yan.,Liu, Shuangchi.,Roberts, Andrew Philip.,Pan, Hongmiao.,...&Pan, Yongxin.(2020).Classification of a Complexly Mixed Magnetic Mineral Assemblage in Pacific Ocean Surface Sediment by Electron Microscopy and Supervised Magnetic Unmixing.FRONTIERS IN EARTH SCIENCE,8,18.
MLA Li, Jinhua,et al."Classification of a Complexly Mixed Magnetic Mineral Assemblage in Pacific Ocean Surface Sediment by Electron Microscopy and Supervised Magnetic Unmixing".FRONTIERS IN EARTH SCIENCE 8(2020):18.

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来源：地质与地球物理研究所

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