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The sublithospheric mantle as the source of continental flood basalts; the case against the continental lithosphere and plume head reservoirs

Anderson, Don L. (1994) The sublithospheric mantle as the source of continental flood basalts; the case against the continental lithosphere and plume head reservoirs. Earth and Planetary Science Letters, 123 (1-3). pp. 269-280. ISSN 0012-821X. https://resolver.caltech.edu/CaltechAUTHORS:20140513-110016305

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Abstract

Continental flood basalt (CFB) provinces have been attributed to a variety of sources. Among these are: (1) ancient continental lithosphere (CL); (2) newly arrived plume heads from the core-mantle boundary; (3) steady-state plumes coincident with CL rifts; (4) fossil plume heads; and (5) contamination of deep upwellings (passive or active) by enriched sublithospheric shallow mantle. The criticism that CL is too cold to provide extensive magmatism has been countered by the proposal that the CL is wet, thereby lowering the melting point. This also lowers the viscosity and increases the local Rayleigh number. The calculated seismic velocities and viscosities in this proposed CL source show that it has a low velocity and is weak and has asthenosphere-like physical properties. It is apparent that what has been called ‘continental lithosphere’ is actually asthenosphere or the lower part of the thermal boundary layer (TBL) and is unlikely to be a long-lived part of the plate. However, a low density and low viscosity region of the sublithospheric mantle (the perisphere) is a suitable reservoir for the enriched component of CFB. It helps to isolate the deeper depleted reservoir from contamination due to recycling at subduction zones. Lithospheric pull-apart at cratonic boundaries, rather than stretching of uniform lithosphere, is suggested as the trigger for extensive continental magmatism.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://www.sciencedirect.com/science/article/pii/0012821X94902739PublisherArticle
http://dx.doi.org/10.1016/0012-821X(94)90273-9DOIArticle
Additional Information:© 1994 Elsevier Science B.V. Received August 31, 1993; revision accepted March 29, 1994. Joel Ita, Marcia McNutt and Bill Leeman provided constructive comments. I thank Eleanor and John R. McMillan for their support. This research was partially supported by NSF. Contribution No. 5308, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125.
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Caltech Division of Geological and Planetary Sciences5308
Issue or Number:1-3
Record Number:CaltechAUTHORS:20140513-110016305
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140513-110016305
Official Citation:Don L. Anderson, The sublithospheric mantle as the source of continental flood basalts; the case against the continental lithosphere and plume head reservoirs, Earth and Planetary Science Letters, Volume 123, Issues 1–3, May 1994, Pages 269-280, ISSN 0012-821X, http://dx.doi.org/10.1016/0012-821X(94)90273-9. (http://www.sciencedirect.com/science/article/pii/0012821X94902739)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45719
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:13 May 2014 18:15
Last Modified:03 Oct 2019 06:35

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