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Age dating of basalt

(2002), as also the modelled hotspot track showing expected ages in Ma.

(b) Plot of the same samples on the familiar AFM diagram, showing the Fe enrichment trend typical of tholeiitic basalts.

The Lakshadweep-Chagos Ridge, and the islands of Mauritius and Runion, are located along fracture zones, and the systematic southerly age progression along the Ridge (though questioned) may be a result of southward crack propagation through the oceanic lithosphere.

This idea avoids the problem of a 10° palaeolatitude discrepancy which the plume model can only solve with the , 1999a, 2005a).

, 1990) postulates that (i) the currently active Réunion Island, in the Indian Ocean, is fed by the narrow “tail” of a mantle plume that rises from the core-mantle boundary, (ii) the Deccan continental flood basalt (CFB) province of India originated from the “head” of the same plume during its early eruptive phase near the end of the Cretaceous, and (iii) the Lakshadweep-Chagos Ridge, an important linear volcanic ridge in the Indian Ocean, is a product of this plume.

It is not generally appreciated, however, that this so-called “classic” case of a plume contradicts the plume model in many ways.

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These papers are in unanimous agreement on two issues: (i) the Deccan originated from the ancestral Runion hotspot which upwelled beneath India in the late Cretaceous, and (ii) the hotspot, now located on the African plate, is fed by a deep mantle plume.

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