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- W2088892900 startingPage "17839" @default.
- W2088892900 abstract "Pb, Sr, and Nd isotopic ratios and their parent/daughter element concentrations for 28 basalts from 10 hotspot and nonhotspot seamounts are reported. Nd and Sr isotopic compositions ( 143 Nd/ 144 Nd = 0.51325–0.51304; 87 Sr/ 86 Sr = 0.70237–0.70275) plot in the envelope for Juan de Fuca‐Gorda ridge basalts with tholeiitic basalts showing more depleted sources and a better negative correlation than transitional to alkalic basalts. Pb isotopic ratios in tholeiitic and alkalic basalts overlap ( 206 Pb/ 204 Pb = 18.29–19.44) and display a trend toward more radiogenic Pb in alkalic basalts. The isotopic data for hotspot and nonhotspot basalts are indistinguishable and correlate broadly with rock composition, implying that they are controlled by partial melting. The isotopic variation in the seamount basalts is about 60% (Nd‐Sr) to 100% (Pb) of that in East Pacific Rise basalts and is interpreted as a lower limit for the magnitude of mantle heterogeneity in the northeast Pacific. The data indicate absence of a chemically distinct plume component in the linear seamount chains and strongly suggest an origin from mid‐ocean ridge basalt‐like east Pacific mantle." @default.
- W2088892900 created "2016-06-24" @default.
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- W2088892900 date "1989-12-10" @default.
- W2088892900 modified "2023-10-13" @default.
- W2088892900 title "Pb, Sr, and Nd isotopes in seamount basalts from the Juan de Fuca Ridge and Kodiak‐Bowie Seamount Chain, northeast Pacific" @default.
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