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correspondence 75° N To the Editor — Subduction of continental Reference location: 29° N, 88° E crust is generally thought to be inhibited by buoyancy, whereas cooled oceanic 50° N crust is denser than the mantle and is prone to subduction . This explains why Eurasia continental crust is up to billions of years 25° N old, whereas in-situ oceanic crust is not Tibetan Himalaya van Hinsbergen et al. (2012) more than hundreds of millions of years old. 2 0 Recently, Ingalls et al. posited that all crust Tibetan Himalaya, Ingalls et al. (2016) consumed by convergence between India India and Asia since about 56 million years ago 25° S was continental. They compared modern crustal volumes in the India–Asia collision zone with pre-collisional volumes inferred 50° S from their palaeogeographic reconstruction Tibetan Himalayan palaeomagnetic and argued that 50% of this continental locality average 75° S crust — a region stretching northward for Tibetan Himalaya–Asia collision Triassic JurassicCretaceous Cenozoic about 2,400 km, forming a Greater Indian 250 225 200 175 150 125 100 75 50 25 0 continental promontory — has entirely Age (Ma) subducted. Geophysical modelling suggests that Fig. 1 | Palaeolatitude versus time curve displaying the predicted
Nature Geoscience – Springer Journals
Published: Dec 1, 2017
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