Nature of the upper crust beneath central Tibet

Details Nature of the upper crust beneath central Tibet Nature of the upper crust beneath central Tibet

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..84..204z&link_type=abstract

Earth and Planetary Science Letters, Volume 84, Issue 2-3, p. 204-210.

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14

Scientific paper

A wide-angle reflection/refraction seismic line obtained through Sino-French joint research near the Bangung-Nujiang Suture in Tibet [1] yielded crustal velocity estimates for both P and S waves. A Vp/Vs ratio of 1.65 was derived fo waves propagating in the upper ( < 25 km) crust. According to the high-pressure, high-temperature velocity measurements of Kern [2] and others, such a ratio implies the presence of quartz-rich rocks, e.g., granites and granitic gneisses, in the upper Tibetan crust. Because of the high geothermal gradient in Tibet ( > 50°C/km near the surface), a shallow low-velocity zone is expected to form in a granitic upper crust for both P and S waves. A two-dimensional ray-tracing study indicates that the observed first P and S waves [1] can be interpreted as diving waves above a low-velocity zone where a positive gradient exists. The low-velocity zone commences at a depth of 10 km and extends possibly to 20 km or deeper.

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