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- W2117587804 abstract "[1] The morphology of the flanks of the Southwest Indian Ridge holds a record of seafloor formation and abyssal hill generation at an ultraslow spreading rate. Statistical analysis of compiled bathymetry and gravity data from the flanks of the Southwest Indian Ridge from 54°E to 67°E provides estimates of abyssal hill morphologic character and inferred crustal thickness. The extent of the compiled data encompasses a spreading rate change from slow to ultraslow at ∼24 Ma, a significant inferred variation in sub-axis mantle temperature, and a patchwork of volcanic and non-volcanic seafloor, making the Southwest Indian Ridge an ideal and unique location to characterize abyssal hills generated by ultraslow spreading and to examine the effect of dramatic spreading rate change on seafloor morphology. Root mean square abyssal hill height in ultraslow spreading seafloor ranges from ∼280 m to ∼320 m and is on average ∼80 m greater than found for slow-spreading seafloor. Ultraslow spreading abyssal hill width ranges from ∼4 km to ∼12 km, averaging ∼8 km. Abyssal hill height and width increases west-to-east in both slow and ultraslow spreading seafloor, corresponding to decreasing inferred mantle temperature. Abyssal hills persist in non-volcanic seafloor and extend continuously from volcanic to non-volcanic terrains. We attribute the increase of abyssal hill height and width to strengthening of the mantle portion of the lithosphere as the result of cooler sub-axial mantle temperature and conclude that abyssal hill height is primarily controlled by the strength of the mantle component of the lithosphere rather than spreading rate." @default.
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- W2117587804 date "2012-02-01" @default.
- W2117587804 modified "2023-10-15" @default.
- W2117587804 title "Abyssal hill characterization at the ultraslow spreading Southwest Indian Ridge" @default.
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- W2117587804 doi "https://doi.org/10.1029/2011gc003850" @default.
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