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Between a Hotspot and a Cold Spot: Isotopic Variation in the Southeast Indian Ridge Asthenosphere, 86{degrees}E-118{degrees}E |
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| Authors: | MAHONEY J J; GRAHAM D W; CHRISTIE D M; JOHNSON K T M; HALL L S; VONDERHAAR D L |
| Institution: | 1SCHOOL OF OCEAN AND EARTH SCIENCE AND TECHNOLOGY, UNIVERSITY OF HAWAII, HONOLULU, HI 96822, USA 2COLLEGE OF OCEANIC AND ATMOSPHERIC SCIENCES, OREGON STATE UNIVERSITY, CORVALLIS, OR 97331, USA 3BISHOP MUSEUM, HONOLULU, HI 96817, USA |
| Abstract: | Glasses from a 2600 km section of the Southeast Indian Ridgewest of the Australian–Antarctic Discordance all possessNd–Pb–Sr isotopic signatures typical of Indian Oceanridge basalt. The boundary between Pacific- and Indian-Ocean-typeridge basalt within the Discordance thus marks the westernmostextent of shallow Pacific-type asthenosphere beneath the ridge.Along-axis He, Nd, Pb, and Sr isotopic patterns are largelyindependent of ridge segmentation, but a weak tendency is evidentfor the most strongly Indian-Ocean-type mantle to be relativelyfusible and for shallower asthenosphere to have lower 3He/4He.On average, |
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