Define isotopic dating

28-Nov-2020 07:53

Typical tholeiite trend (Thingmuli, Iceland) and calc-alkaline trend (Cascades) are also shown, along with boundaries between the two fields proposed by Kuno (1968) and Irvine & Baragar (1971).

See Sheth (2005b) for an extended petrological discussion.

The interplay of several intersecting continental rift zones in India is apparently responsible for the roughly circular outcrop of the Deccan.WG is the Western Ghats region (ages from Venkatesan et al., 1993 and others).~ 64 Ma age for Rajahmundry basalts is from Baksi (2001a). KK, ~ 90-69 Ma Karnataka-Kerala dykes (e.g., Radhakrishna et al., 1994; Anil Kumar et al., 2001). Mary's Islands volcanics (85.5 Ma, Pande et al., 2001), part of the Indo-Madagascar CFB which in India is otherwise represented by the KK dykes.I ascribe the rifting itself not to mantle plume heads but to large-scale plate dynamics, possibly aided by long-term thermal insulation beneath a supercontinent which may have surface effects similar to those predicted for “plume incubation” models.Non-plume, plate tectonic models are capable of explaining the Deccan in all its greatness., 1990), hundreds of papers have invoked, or supported, a plume head origin for the Deccan Traps of India.

The interplay of several intersecting continental rift zones in India is apparently responsible for the roughly circular outcrop of the Deccan.WG is the Western Ghats region (ages from Venkatesan et al., 1993 and others).~ 64 Ma age for Rajahmundry basalts is from Baksi (2001a). KK, ~ 90-69 Ma Karnataka-Kerala dykes (e.g., Radhakrishna et al., 1994; Anil Kumar et al., 2001). Mary's Islands volcanics (85.5 Ma, Pande et al., 2001), part of the Indo-Madagascar CFB which in India is otherwise represented by the KK dykes.I ascribe the rifting itself not to mantle plume heads but to large-scale plate dynamics, possibly aided by long-term thermal insulation beneath a supercontinent which may have surface effects similar to those predicted for “plume incubation” models.Non-plume, plate tectonic models are capable of explaining the Deccan in all its greatness., 1990), hundreds of papers have invoked, or supported, a plume head origin for the Deccan Traps of India.(2002), as also the modelled hotspot track showing expected ages in Ma.