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Magma production rate along the Ninetyeast Ridge and its relationship to Indian plate motion and Kerguelen hot spot activity
Author(s) -
Sreejith K. M.,
Krishna K. S.
Publication year - 2015
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2014gl062993
Subject(s) - geology , ridge , mantle plume , plume , hotspot (geology) , magma , mantle (geology) , plate tectonics , mid ocean ridge , seismology , geophysics , volcano , tectonics , paleontology , lithosphere , geography , meteorology
The Ninetyeast Ridge, a linear trace of the Kerguelen hot spot in the Indian Ocean, was emplaced on a rapidly drifting Indian plate. Magma production rates along the ridge track are computed using gravity‐derived excess crustal thickness data. The production rates change between 2 and 15 m 3 /s over timescales of 3–16 Myr. Major variations in magma production rates are primarily associated with significant changes in the Indian plate velocity with low‐production phases linked to high plate velocity periods. The lowest magma production rate (2 m 3 /s) at 62 Ma is associated with the rapid northward drift of Indian plate under the influence of the Reunion mantle plume. The contemporaneous slowing of the African plate coincides with increase in magma production rate along the Walvis Ridge in the Atlantic Ocean. The present study suggests that variations in the Indian plate motion and frequent ridge jumps have a major role in controlling the magma production, particularly on long‐period cycles (~16 Myr). Short‐period variations (~5 Myr) in magma productions may be associated with intrinsic changes in the plume, possibly due to the presence of solitary waves in the plume conduit.