Classification of a Complexly Mixed Magnetic Mineral Assemblage in Pacific Ocean Surface Sediment by Electron Microscopy and Supervised Magnetic Unmixing

doi:10.3389/feart.2020.609058

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋生态与环境科学重点实验室

	Classification of a Complexly Mixed Magnetic Mineral Assemblage in Pacific Ocean Surface Sediment by Electron Microscopy and Supervised Magnetic Unmixing
	Li, Jinhua 1,3,4,5; Liu, Yan 1,3,4,5; Liu, Shuangchi 1,3; Roberts, Andrew Philip 6; Pan, Hongmiao 2,5; Xiao, Tian 2,5; Pan, Yongxin 1,3,4,5
刊名	FRONTIERS IN EARTH SCIENCE
	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
DOI	10.3389/feart.2020.609058
通讯作者	Li, Jinhua(lijinhua@mail.iggcas.ac.cn)
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.
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
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/169545]
专题	海洋研究所_海洋生态与环境科学重点实验室
通讯作者	Li, Jinhua
作者单位	1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Ecol & Environm Sci, Qingdao, Peoples R China 3.Chinese Acad Sci, Innovat Acad Earth Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China 4.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China 5.CNRS CAS, Int Associated Lab Evolut & Dev Magnetotact Multi, Beijing, Peoples R China 6.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia
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.