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![Page 1: Rifting of mature oceanic lithosphere at Chagos Bank, central Indian Ocean](https://reader035.vdocuments.mx/reader035/viewer/2022062410/5681522a550346895dc071ef/html5/thumbnails/1.jpg)
Rifting of mature oceanic lithosphere at Chagos Bank, central Indian Ocean
T. J. Henstock and T. A. MinshullSouthampton Oceanography Centre
~25 km thick 49 Ma oceanic crust focused extension cf diffuse compression ~1.5 km deep rift valley active seismicity IRIS station on Diego Garcia and fixed CTBT hydrophones nearby
![Page 2: Rifting of mature oceanic lithosphere at Chagos Bank, central Indian Ocean](https://reader035.vdocuments.mx/reader035/viewer/2022062410/5681522a550346895dc071ef/html5/thumbnails/2.jpg)
Bathymetry and gravity across rift valley
Crustal thinning underlies bathymetric trough in some profiles, whilst in others an offset between the thinning and the trough is required
![Page 3: Rifting of mature oceanic lithosphere at Chagos Bank, central Indian Ocean](https://reader035.vdocuments.mx/reader035/viewer/2022062410/5681522a550346895dc071ef/html5/thumbnails/3.jpg)
Possible explanation from rheological models
Predictions for 49 Ma oceanic lithosphere assuming oceanic crust behaves as dry diabase and mantle as dry duniteThick crust => lower crustal flowThin crust => single crustal layer