Composition and thickness of the southern Altiplano crust, Bolivia

G. Zandt; A. A. Velasco; S. L. Beck

doi:10.1130/0091-7613(1994)022<1003:CATOTS>2.3.CO;2

Composition and thickness of the southern Altiplano crust, Bolivia

G. Zandt, A. A. Velasco, S. L. Beck

Geosciences

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Abstract

Slant stacking of broadband seismograms recorded in the western US for two 1993 intermediate-depth earthquakes that occurred near the Bolivia-Argentina-Chile borders reveals small but clear precursors to both the wave and S wave depth phases. These precursors represent underside reflections from the thickened Andean Altiplano crust. The best-fit model has an average crustal velocity of 5.9-6.0 km/s, a crustal V _p /V _s of 1.6, a crustal thickness of 75-80 km, and a high-velocity, high-V _p /V _s mantle wedge. The finding of a thick felsic crust overlying a high-velocity mantle supports models of Altiplano uplift due predominantly to crustal shortening as opposed to mafic magmatic addition and is inconsistent with recent mantle delamination. -from Authors

Original language	English (US)
Pages (from-to)	1003-1006
Number of pages	4
Journal	Geology
Volume	22
Issue number	11
DOIs	https://doi.org/10.1130/0091-7613(1994)022<1003:CATOTS>2.3.CO;2
State	Published - Jan 1 1994

ASJC Scopus subject areas

Geology

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10.1130/0091-7613(1994)022<1003:CATOTS>2.3.CO;2

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abstract = " Slant stacking of broadband seismograms recorded in the western US for two 1993 intermediate-depth earthquakes that occurred near the Bolivia-Argentina-Chile borders reveals small but clear precursors to both the wave and S wave depth phases. These precursors represent underside reflections from the thickened Andean Altiplano crust. The best-fit model has an average crustal velocity of 5.9-6.0 km/s, a crustal V p /V s of 1.6, a crustal thickness of 75-80 km, and a high-velocity, high-V p /V s mantle wedge. The finding of a thick felsic crust overlying a high-velocity mantle supports models of Altiplano uplift due predominantly to crustal shortening as opposed to mafic magmatic addition and is inconsistent with recent mantle delamination. -from Authors ",

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AU - Velasco, A. A.

AU - Beck, S. L.

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N2 - Slant stacking of broadband seismograms recorded in the western US for two 1993 intermediate-depth earthquakes that occurred near the Bolivia-Argentina-Chile borders reveals small but clear precursors to both the wave and S wave depth phases. These precursors represent underside reflections from the thickened Andean Altiplano crust. The best-fit model has an average crustal velocity of 5.9-6.0 km/s, a crustal V p /V s of 1.6, a crustal thickness of 75-80 km, and a high-velocity, high-V p /V s mantle wedge. The finding of a thick felsic crust overlying a high-velocity mantle supports models of Altiplano uplift due predominantly to crustal shortening as opposed to mafic magmatic addition and is inconsistent with recent mantle delamination. -from Authors

AB - Slant stacking of broadband seismograms recorded in the western US for two 1993 intermediate-depth earthquakes that occurred near the Bolivia-Argentina-Chile borders reveals small but clear precursors to both the wave and S wave depth phases. These precursors represent underside reflections from the thickened Andean Altiplano crust. The best-fit model has an average crustal velocity of 5.9-6.0 km/s, a crustal V p /V s of 1.6, a crustal thickness of 75-80 km, and a high-velocity, high-V p /V s mantle wedge. The finding of a thick felsic crust overlying a high-velocity mantle supports models of Altiplano uplift due predominantly to crustal shortening as opposed to mafic magmatic addition and is inconsistent with recent mantle delamination. -from Authors

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Composition and thickness of the southern Altiplano crust, Bolivia

Abstract

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