{"data":{"id":"10.1594/pangaea.708079","type":"dois","attributes":{"doi":"10.1594/pangaea.708079","prefix":"10.1594","suffix":"pangaea.708079","identifiers":[],"alternateIdentifiers":[],"creators":[{"name":"Filippelli, Gabriel M","givenName":"Gabriel M","familyName":"Filippelli","affiliation":[],"nameIdentifiers":[]},{"name":"Delaney, Margaret Lois","givenName":"Margaret Lois","familyName":"Delaney","affiliation":[],"nameIdentifiers":[]}],"titles":[{"title":"Phosphorus partition and acumulation rates in sediments of ODP Legs 130 and 138"}],"publisher":"PANGAEA","container":{},"publicationYear":1996,"subjects":[{"subject":"Drilling/drill rig","subjectScheme":"Method"},{"subject":"Leg130","subjectScheme":"Campaign"},{"subject":"Leg138","subjectScheme":"Campaign"},{"subject":"Joides Resolution","subjectScheme":"Basis"},{"subject":"Ocean Drilling Program (ODP)","subjectScheme":"Project"}],"contributors":[],"dates":[{"date":"1996","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":"10.1016/0016-7037(96)00042-7","relatedIdentifierType":"DOI"}],"relatedItems":[],"sizes":["9 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":"Understanding phosphorus (P) geochemistry and burial in oceanic sediments is important because of the role of P for modulating oceanic productivity on long timescales. We investigated P geochemistry in seven equatorial Pacific sites over the last 53 Ma, using a sequential extraction technique to elucidate sedimentary P composition and P diagenesis within the sediments. The dominant P-bearing component in these sediments is authigenic P (61-86% of total P), followed in order of relative dominance by iron-bound P (7-17%), organic P (3-12%), adsorbed P (2-9%), and detrital P (0-1%). Clear temporal trends in P component composition exist. Organic P decreases rapidly in younger sediments in the eastern Pacific (the only sites with high sample resolution in the younger intervals), from a mean concentration of 2.3 µmol P/g sediment in the 0-1 Ma interval to 0.4 µmol/g in the 5- 6 Ma interval. Over this same time interval, decreases are also observed for iron-bound P (from 2.1 to 1.1 µmol P/g) and adsorbed P (from 1.5 to 0.7 µmol P/g). These decreases are in contrast to increases in authigenic P (from 6.0-9.6 µmol P/g) and no significant changes in detrital P (0.1 µmol P/g) and total P (12 µmol P/g).These temporal trends in P geochemistry suggest that (1) organic matter, the principal shuttle of P to the seafloor, is regenerated in sediments and releases associated P to interstitial waters, (2) P associated with iron-rich oxyhydroxides is released to interstitial waters upon microbial iron reduction, (3) the decrease in adsorbed P with age and depth probably indicates a similar decrease in interstitial water P concentrations, and (4) carbonate fluorapatite (CFA), or another authigenic P-bearing phase, precipitates due to the release of P from organic matter and iron oxyhydroxides and becomes an increasingly significant P sink with age and depth. The reorganization of P between various sedimentary pools, and its eventual incorporation in CFA, has been recognized in a variety of continental margin environments, but this is the first time these processes have been revealed in deep-sea sediments. Phosphorus accumulation rate data from this study and others indicates that the global pre-anthropogenic input rate of P to the ocean (20x10**10 mol P/yr) is about a factor of four times higher than previously thought, supporting recent suggestions that the residence time of P in the oceans may be as short as 10000-20000 years.","descriptionType":"Abstract"},{"description":"Supplement to: Filippelli, Gabriel M; Delaney, Margaret Lois (1996): Phosphorus geochemistry of Equatorial Pacific sediments. Geochimica et Cosmochimica Acta, 60(9), 1479-1495","descriptionType":"Other"}],"geoLocations":[{"geoLocationBox":{"eastBoundLongitude":"-90.48076000000003","northBoundLatitude":"7.92131","southBoundLatitude":"-3.09493","westBoundLongitude":"156.625"}},{"geoLocationPlace":"North Pacific Ocean"},{"geoLocationPlace":"West equatorial Pacific Ocean"},{"geoLocationPlace":"South Pacific 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