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La zona de baja velocidad; The Low Velocity Zone

Anderson, Don L. and Sammis, Charles (1969) La zona de baja velocidad; The Low Velocity Zone. Geofisica Internacional, 9 . pp. 3-19. ISSN 0016-7169. https://resolver.caltech.edu/CaltechAUTHORS:20140430-100107634

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Abstract

The low velocity zone in tectonic and oceanic regions is too pronounced to be the effect of high temperature gradients alone. Partial melting is consistent with the low velocity, low Q and abrupt boundaries of this region of the upper mantle and is also consistent with measured heat flow values. The inferred low melting temperatures seem to indicate that the water pressure is sufficiently high to lower the solidus about 200° C to 400° C below laboratory determinations of the melting point of anhydrous silicates. The mechanical instability of a partially molten layer in the upper mantle is probably an important source of tectonic energy. The top of the low-velocity zone can be considered a self-lubricated surface upon which the top of the mantle and the crust can slide with very little friction. Lateral motion of the crust and upper mantle away from oceanic rises is counterbalanced by the flow of molten material in the low-velocity layer toward the rise where it eventually emerges as new crust. If this lateral flow of molten material is not as efficient as the upward removal of magma, the regions of extrusion, such as oceanic rises, will migrate.


Item Type:Article
Additional Information:© 1969 Union Geofisica Mexicana. Monograph title Pan American symposium on the upper mantle, Mexico, D.F., 1969 Group 5, Seismology. This research was partially supported by the Air Force Office of Scientific Research, Office of Aerospace Research, United States Air Force, under AFOSR contract number AF-49(638)-1337, and National Science Foundation grant GA 1003.
Funders:
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)AF-49(638)-1337
NSFGA 1003
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Other Numbering System NameOther Numbering System ID
Caltech Divisiόn de Ciencias Geolόgicas 1547
Record Number:CaltechAUTHORS:20140430-100107634
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140430-100107634
Official Citation:Anderson, D. L., & Sammis, C. (1969). La zona de baja velocidad ; the low velocity zone. Geofisica Internacional, 9, 3-19.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45352
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:30 Apr 2014 18:56
Last Modified:03 Oct 2019 06:29

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