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Crustal structure and upper mantle stratigraphy of the Arabian shield
Author(s) -
Kumar M. Ravi,
Ramesh D. S.,
Saul Joachim,
Sarkar Dipankar,
Kind Rainer
Publication year - 2002
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2001gl014530
Subject(s) - geology , mantle (geology) , classification of discontinuities , baltic shield , discontinuity (linguistics) , shield , receiver function , seismology , crust , geophysics , transition zone , petrology , lithosphere , tectonics , mathematical analysis , mathematics
Analysis of receiver functions from an eight‐station network on the Saudi Arabian shield indicates that the Moho depths vary between 35–38 km. The crust appears to be rather felsic in nature as evidenced by Poisson's ratios of 0.25–0.27. A prominent negative phase following the Moho conversion is suggestive of a zone of velocity inversion. Indication of mantle stratification is observed beneath the coastal region of Arabia, by way of an additional upper mantle discontinuity at about 240 km. The conversions from the 410 and 660‐km discontinuities are significantly delayed, suggesting a slow and hot upper mantle.