Some remarks on heat flow and gravity anomalies

McKenzie, D. P. (1967) Some remarks on heat flow and gravity anomalies. Journal of Geophysical Research, 72. pp. 6261-6273. ISSN 0148-0227 DOI 10.1029/JZ072i024p06261

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Abstract

Heat flow anomalies on the oceanic ridges and the large free air gravity anomalies observed from the earth's surface and from satellites are often believed to be surface expressions of high temperatures and flow within the mantle. A simple model for the temperature within a spreading sea floor can, however, reproduce the shape and magnitude of the observed anomalies. Thus, it is not necessary for the upper mantle to be hotter beneath ridges than it is elsewhere. A similar model may be used to relate the free air gravity anomaly to the stress in the lithosphere. The results show that long-wavelength harmonics of the external gravity field cannot be supported by the strength of the lithosphere. Most free air anomalies observed on the surface can be maintained in this way, except possibly the largest of those over the trenches.

Item Type:	Article
Uncontrolled Keywords:	NIL AREP
Subjects:	02 - Geodynamics, Geophysics and Tectonics
Divisions:	02 - Geodynamics, Geophysics and Tectonics
Journal or Publication Title:	Journal of Geophysical Research
Volume:	72
Page Range:	pp. 6261-6273
Identification Number:	10.1029/JZ072i024p06261
Depositing User:	Sarah Humbert
Date Deposited:	21 May 2015 10:32
Last Modified:	21 May 2015 10:32
URI:	http://eprints.esc.cam.ac.uk/id/eprint/3300

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