{"refrec":{"BRefID":143589,"RR":"<b>White, W.M.; Patchett, J.; BenOthman, D.</b> (1986). Hf isotope ratios of marine sediments and Mn nodules: evidence for a mantle source of Hf in seawater. <i>Earth Planet. Sci. Lett. 79(1-2)</i>: 46-54","BEntID":136771,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Earth Planet. Sci. Lett. 79(1-2)</i>: 46-54","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"White, W.M.; Patchett, J.; BenOthman, D.","OrigTitleTranslFlag":0,"Authorstringtrunc":"White, W.M. <i>et al.</i>","Englishabstract":"Hf isotope ratios are reported for 6 Mn nodules and 15 other sediments, including siliceous oozes, red clays and terrigenous sediments. Overall, epsilon<sub>Hf</sub> ranges from -19.8 to +3.5, but only from +0.4 to +3.5 in the Mn nodules. The Indian and Atlantic nodules have epsilon<sub>Hf</sub> values (+0.4 and +0.9) which are only slightly lower than values from Pacific nodules (+1.9 to +3.5). The positive epsilon<sub>Hf</sub> values of the Mn nodules indicate much, and perhaps most, of the Hf in seawater is derived from some \"mantle\" source such as ocean ridge hydrothermal activity, low-temperature alteration of the oceanic crust, or weathering of the young volcanic terranes of the circum-Pacific region. The dominance of \"mantle\" sources of Hf may result from a very low flux of Hf from the continents rather than a particularly high volcanic one. A low continental flux may result from retention of Hf in zircon, a mineral which is very resistant to weathering. The near uniformity of Hf in nodules from various oceans suggests a longer seawater residence time for Hf than for Nd, probably because Hf is not readily scavanged by particulate matter.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Hf isotope ratios of marine sediments and Mn nodules: evidence for a mantle source of Hf in seawater","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1986,"MonPub":null,"DateUpdate":"2018-11-13","DateCreate":"2010-02-08","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:A1986D863700006","VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":143589,"PubliDate":1986,"Pagination":"46-54","XtraPublOfAnaID":null,"ISBN":null,"Volume":"79","Issue":"1-2","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42615,"SerRR":"Earth and Planetary Science Letters. 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