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dc.contributor.authorSeber, D.
dc.contributor.authorBarazangi, M.
dc.contributor.authorChaimov, T.
dc.contributor.authorAl-Saad, D.
dc.contributor.authorSawaf, T.
dc.contributor.authorKhaddour, M.
dc.date.accessioned2007-02-28T15:01:55Z
dc.date.available2007-02-28T15:01:55Z
dc.date.issued1993
dc.identifier.citationGeophysical Journal International, vol. 113, p. 752-766, 1993en_US
dc.identifier.issn0955-419X
dc.identifier.urihttps://hdl.handle.net/1813/5411
dc.descriptionAn edited version of this paper was published in Geophysical Journal International by Blackwell Publishing. Copyright 1993, Blackwell Publishing. See also: http://www.blackwellpublishing.com/journal.asp?ref=0956-540X&site=1; http://atlas.geo.cornell.edu/syria/seber_gji_1993.htmen_US
dc.description.abstractThe intracontinental Palmyride fold-thrust belt, which is the site of an inverted Mesozoic rift, is sandwiched between two crustal blocks, the Aleppo plateau in the north and the Rutbah uplift in the south. The 400 x 100 km belt merges with the Dead Sea fault system in the southwest and gradually ends near the Euphrates depression in the northeast. Very dense (i.e., 100 m geophone spacing), reversed and multifold seismic refraction profiling was carried out to map approximately the upper 15 km of the crust in the early 1970s. These refraction data are utilized to model sedimentary rock thickness, seismic velocity, and basement morphology. Extensive data coverage also enables identification of the major faults of the region. A 2-D ray tracing technique is used in the modeling. Interpretation of these data indicates that five distinct velocity layers characterize the upper crust of the northern Arabian platform in Syria. The P-wave velocities within these layers are (in km s-1): 2.0-2.8, 4.0-4.4, 5.2-5.3 , 5.5-5.7, corresponding to sedimentary rocks from Quaternary to late Precambrian in age, and 5.9-6.0, corresponding to metamorphic basement. A comparison of the velocity models with the available drill hole information and seismic reflection profiles shows strong velocity variations in a given geologic formation, depending on the depth and location of the formation. The depth to metamorphic basement beneath the Palmyride fold belt clearly shows a deep trough, filled with Phanerozoic sedimentary rocks. These rocks decrease in thickness from about 11 km in the southwest to about 9 km in the central segment of the belt. The basement depth is about 6 km in the Aleppo plateau and not less than 8 km in the Rutbah uplift. Deeper basement in the Rutbah uplift is probably the result of a Precambrian rifting episode, clearly identified to the south in Jordan and Saudi Arabia. Cenozoic crustal shortening of about 20-25% across the southwestern segment of the Palmyride belt has not been sufficient to substantially reduce the size of the basement trough beneath this mountain belt. Finally, northeast decreasing basement depth in the Palmyrides supports the idea that the Palmyride Mesozoic rifting was developed as an aulacogen of the rifted Levantine margin along the eastern Mediterranean.en_US
dc.format.extent125526 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoenen_US
dc.publisherBlackwell Publishing on behalf of The Royal Astronomical Society and The Deutsche Geophysikalische Gesellschaften_US
dc.subjectSyriaen_US
dc.subjectPalmyride fold-thrust belten_US
dc.subjectSeismic refractionen_US
dc.subjectP-wave velocityen_US
dc.titleUpper crustal velocity structure and basement morphology beneath the intracontinental Palmyride fold-thrust belt and north Arabian platform in Syriaen_US
dc.typeperiodicalen_US


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