{"title":"深海沉积物中磁铁矿的低温氧化和随后的岩心溶解，ODP Leg 161(西地中海)","authors":"M. Torii","doi":"10.5636/JGG.49.1233","DOIUrl":null,"url":null,"abstract":"Low-temperature experiments document changes in magnetic mineralogy in Pleistocene hemipelagic sediments at ODP Holes 976D and 977A. The Verwey transition was observed only for samples below ∼1.3 mbsf, which suggests depth-limited appearance of stoichiometric magnetite in the sediment column. Primary magnetite is interpreted to be covered with a maghemite skin as a result of in situ low-temperature oxidation on the sea floor. The oxidized maghemite skin gradually dissolves with depth, and the Verwey transition is observed below ∼1.3 mbsf. This depth matches the iron redox boundary inferred on the basis of a sediment color change from tan to green.","PeriodicalId":156587,"journal":{"name":"Journal of geomagnetism and geoelectricity","volume":"272 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1997-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"39","resultStr":"{\"title\":\"Low-Temperature Oxidation and Subsequent Downcore Dissolution of Magnetite in Deep-Sea Sediments, ODP Leg 161 (Western Mediterranean)\",\"authors\":\"M. Torii\",\"doi\":\"10.5636/JGG.49.1233\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Low-temperature experiments document changes in magnetic mineralogy in Pleistocene hemipelagic sediments at ODP Holes 976D and 977A. The Verwey transition was observed only for samples below ∼1.3 mbsf, which suggests depth-limited appearance of stoichiometric magnetite in the sediment column. Primary magnetite is interpreted to be covered with a maghemite skin as a result of in situ low-temperature oxidation on the sea floor. The oxidized maghemite skin gradually dissolves with depth, and the Verwey transition is observed below ∼1.3 mbsf. This depth matches the iron redox boundary inferred on the basis of a sediment color change from tan to green.\",\"PeriodicalId\":156587,\"journal\":{\"name\":\"Journal of geomagnetism and geoelectricity\",\"volume\":\"272 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1997-10-20\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"39\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of geomagnetism and geoelectricity\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.5636/JGG.49.1233\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of geomagnetism and geoelectricity","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.5636/JGG.49.1233","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Low-Temperature Oxidation and Subsequent Downcore Dissolution of Magnetite in Deep-Sea Sediments, ODP Leg 161 (Western Mediterranean)
Low-temperature experiments document changes in magnetic mineralogy in Pleistocene hemipelagic sediments at ODP Holes 976D and 977A. The Verwey transition was observed only for samples below ∼1.3 mbsf, which suggests depth-limited appearance of stoichiometric magnetite in the sediment column. Primary magnetite is interpreted to be covered with a maghemite skin as a result of in situ low-temperature oxidation on the sea floor. The oxidized maghemite skin gradually dissolves with depth, and the Verwey transition is observed below ∼1.3 mbsf. This depth matches the iron redox boundary inferred on the basis of a sediment color change from tan to green.
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