{"data":{"id":"10.1594/pangaea.710890","type":"dois","attributes":{"doi":"10.1594/pangaea.710890","prefix":"10.1594","suffix":"pangaea.710890","identifiers":[],"alternateIdentifiers":[],"creators":[{"name":"Poulton, Simon W","givenName":"Simon W","familyName":"Poulton","nameIdentifiers":[{"schemeUri":"https://orcid.org","nameIdentifier":"https://orcid.org/0000-0001-7621-189X","nameIdentifierScheme":"ORCID"}],"affiliation":[]},{"name":"Canfield, Donald E","givenName":"Donald E","familyName":"Canfield","affiliation":[],"nameIdentifiers":[]}],"titles":[{"title":"Iron and phosphorus speciations in DSDP Leg 92 sediments"}],"publisher":"PANGAEA","container":{},"publicationYear":2006,"subjects":[{"subject":"Drilling/drill rig","subjectScheme":"Method"},{"subject":"Leg92","subjectScheme":"Campaign"},{"subject":"Glomar Challenger","subjectScheme":"Basis"},{"subject":"Deep Sea Drilling Project (DSDP)","subjectScheme":"Project"}],"contributors":[],"dates":[{"date":"2006","dateType":"Issued"}],"language":"en","types":{"ris":"GEN","bibtex":"misc","citeproc":"article","schemaOrg":"Collection","resourceType":"Supplementary Publication Series of Datasets","resourceTypeGeneral":"Collection"},"relatedIdentifiers":[{"relationType":"IsSupplementTo","relatedIdentifier":"10.1016/j.gca.2006.01.030","relatedIdentifierType":"DOI"}],"relatedItems":[],"sizes":["6 datasets"],"formats":["application/zip"],"version":null,"rightsList":[{"rights":"Creative Commons Attribution 3.0 Unported","rightsUri":"https://creativecommons.org/licenses/by/3.0/legalcode","schemeUri":"https://spdx.org/licenses/","rightsIdentifier":"cc-by-3.0","rightsIdentifierScheme":"SPDX"}],"descriptions":[{"description":"We present a detailed study of the co-diagenesis of Fe and P in hydrothermal plume fallout sediments from ~19°S on the southern East Pacific Rise. Three distal sediment cores from 340-1130 km from the ridge crest, collected during DSDP Leg 92, were analysed for solid phase Fe and P associations using sequential chemical extraction techniques. The sediments at all sites are enriched in hydrothermal Fe (oxyhydr)oxides, but during diagenesis a large proportion of the primary ferrihydrite precipitates are transformed to the more stable mineral form of goethite and to a lesser extent to clay minerals, resulting in the release to solution of scavenged P. However, a significant proportion of this P is retained within the sediment, by incorporation into secondary goethite, by precipitation as authigenic apatite, and by readsorption to Fe (oxyhydr)oxides. Molar P/Fe ratios for these sediments are significantly lower than those measured in plume particles from more northern localities along the southern East Pacific Rise, and show a distinct downcore decrease to a depth of ~12 m. Molar P/Fe ratios are then relatively constant to a depth of ~35 m. The Fe and P speciation data indicate that diagenetic modification of the sediments is largely complete by a depth of 2.5 m, and thus depth trends in molar P/Fe ratios can not solely be explained by losses of P from the sediment by diffusion to the overlying water column during early diagenesis. Instead, these sediments are likely recording changes in dissolved P concentrations off the SEPR, possibly as a result of redistribution of nutrients in response to changes in oceanic circulation over the last 10 million years. Furthermore, the relatively low molar P/Fe ratios observed throughout these sediments are not necessarily solely due to losses of scavenged P by diffusion to the overlying water column during diagenesis, but may also reflect post-depositional oxidation of pyrite originating from the volatile-rich vents of the southern East Pacific Rise. This study suggests that the molar P/Fe ratio of oxic Fe-rich sediments may serve as a proxy of relative changes in paleoseawater phosphate concentrations, particularly if Fe sulfide minerals are not an important component during transport and deposition.","descriptionType":"Abstract"},{"description":"Supplement to: Poulton, Simon W; Canfield, Donald E (2006): Co-diagenesis of iron and phosphorus in hydrothermal sediments from the southern East Pacific Rise; implications for the evaluation of paleo-sea water phosphate concentrations. Geochimica et Cosmochimica Acta, 70(23), 5883-5898","descriptionType":"Other"}],"geoLocations":[{"geoLocationBox":{"eastBoundLongitude":"-116.8395","northBoundLatitude":"-18.929","southBoundLatitude":"-19.4515","westBoundLongitude":"-124.6768"}},{"geoLocationPlace":"South Pacific Ocean"},{"geoLocationPlace":"South 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