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Filtering by: Creator Duncan, Robert A. Creator Mahoney, J. J. Language English [eng]

Spatial and temporal distribution of a C-like asthenoshpheric component in the Rano Rahi Seamount Field, East Pacific Rise, 15°-19°S

Creator:

Hall, L. S., Mahoney, J. J., Sinton, J. M., and Duncan, Robert A.

Abstract:

Lavas of the Rano Rahi seamount field define a Nd-Pb-Sr isotopic array that connects, and substantially overlaps, the arrays of the nearby East Pacific Rise axis and 5.6–28 Ma lavas of the Pukapuka ridge system, situated between the seamount field and French Polynesia. Dating of Rano Rahi samples by ⁴⁰Ar-³⁹Ar...

Resource Type:

Article
Geochemistry and geochronology of ancient southeast Indian and southwest Pacific seafloor

Creator:

Pyle, D. G., Christie, David M., Mahoney, J. J., and Duncan, Robert A.

Abstract:

Within the Australian-Antarctic Discordance (AAD), a boundary exists between isotopically defined “Pacific-type” and “Indian-type” mid-ocean ridge basalt (MORB) erupted along the Southeast Indian Ridge (SEIR). This boundary has migrated westward beneath the easternmost AAD spreading segment at a minimum rate of 25 mm/yr since 4 Ma; however, its long-term history...

Resource Type:

Article