{"data":{"id":"10.1594/pangaea.667121","type":"dois","attributes":{"doi":"10.1594/pangaea.667121","prefix":"10.1594","suffix":"pangaea.667121","identifiers":[],"alternateIdentifiers":[],"creators":[{"name":"Cousens, Brian L","givenName":"Brian L","familyName":"Cousens","nameIdentifiers":[{"schemeUri":"https://orcid.org","nameIdentifier":"https://orcid.org/0000-0002-9704-6974","nameIdentifierScheme":"ORCID"}],"affiliation":[]},{"name":"Allan, James F","givenName":"James F","familyName":"Allan","affiliation":[],"nameIdentifiers":[]},{"name":"Leybourne, Matthew I","givenName":"Matthew I","familyName":"Leybourne","nameIdentifiers":[{"schemeUri":"https://orcid.org","nameIdentifier":"https://orcid.org/0000-0002-2361-6014","nameIdentifierScheme":"ORCID"}],"affiliation":[]},{"name":"Chase, R L","givenName":"R L","familyName":"Chase","affiliation":[],"nameIdentifiers":[]},{"name":"van Wagoner, Nancy","givenName":"Nancy","familyName":"van Wagoner","affiliation":[],"nameIdentifiers":[]}],"titles":[{"title":"Element analyses and isotope composition of basalts from the West Valley segment, Juan de Fuca Ridge, northeast Pacific"}],"publisher":"PANGAEA","container":{},"publicationYear":1995,"subjects":[{"subject":"Dredge","subjectScheme":"Method"},{"subject":"Ocean Drilling Program (ODP)","subjectScheme":"Project"}],"contributors":[],"dates":[{"date":"1995","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":"10.1007/bf00306512","relatedIdentifierType":"DOI"}],"relatedItems":[],"sizes":["5 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":"The 50 km-long West Valley segment of the northern Juan de Fuca Ridge is a young, extension-dominated spreading centre, with volcanic activity concentrated in its southern half. A suite of basalts dredged from the West Valley floor, the adjacent Heck Seamount chain, and a small near-axis cone here named Southwest Seamount, includes a spectrum of geochemical compositions ranging from highly depleted normal (N-) MORB to enriched (E-) MORB. Heck Seamount lavas have chondrite-normalized La/Sm en -0.3, 87Sr/86Sr = 0.70235 - 0.70242, and 206Pb/204Pb = 18.22 - 18.44, requiring a source which is highly depleted in trace elements both at the time of melt generation and over geologic time. The E-MORB from Southwest Seamount have La/Sm en -1.8, 87Sr/86Sr = 0.70245 - 0.70260, and 206Pb/204Pb = 18.73 - 19.15, indicating a more enriched source. Basalts from the West Valley floor have chemical compositions intermediate between these two end-members. As a group, West Valley basalts from a two-component mixing array in element-element and element-isotope plots which is best explained by magma mixing. Evidence for crustal-level magma mixing in some basalts includes mineral-melt chemical and isotopic disequilibrium, but mixing of melts at depth (within the mantle) may also occur. The mantle beneath the northern Juan de Fuca Ridge is modelled as a plum-pudding, with \"plums\" of enriched, amphibole-bearing peridotite floating in a depleted matrix (DM). Low degrees of melting preferentially melt the \"plums\", initially removing only the amphibole component and producing alkaline to transitional E-MORB. Higher degrees of melting tap both the \"plums\" and the depleted matrix to yield N-MORB. The subtly different isotopic compositions of the E-MORBs compared to the N-MORBs require that any enriched component in the upper mantle was derived from a depleted source. If the enriched component crystallized from fluids with a DM source, the \"plums\" could evolve to their more evolved isotopic composition after a period of 1.5-2.0 Ga. Alternatively, the enriched component could have formed recently from fluids with a lessdepleted source than DM, such as subducted oceanic crust. A third possibility is that enriched material might be dispersed as \"plums\" throughout the upper mantle, transported from depth by mantle plumes.","descriptionType":"Abstract"},{"description":"Supplement to: Cousens, Brian L; Allan, James F; Leybourne, Matthew I; Chase, R L; van Wagoner, Nancy (1995): Mixing of magmas from enriched and depleted mantle sources in the northeast Pacific: West Valley segment, Juan de Fuca Ridge. Contributions to Mineralogy and Petrology, 120(3-4), 337-357","descriptionType":"Other"}],"geoLocations":[{"geoLocationBox":{"eastBoundLongitude":"-128.9167","northBoundLatitude":"48.533300000000004","southBoundLatitude":"28.446699999999996","westBoundLongitude":"-129.7"}},{"geoLocationPlace":"Juan de Fuca Ridge, North Pacific 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