The Case for Accretion of the Tectosphere by Buoyant Subduction

Publication Status is "Submitted" Or "In Press: 
LDEO Publication: 
Publication Type: 
Year of Publication: 
1991
Authors: 
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Journal Title: 
Geophysical Research Letters
Journal Date: 
Apr
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Volume: 
18
Issue: 
4
Pages: 
585-588
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Publisher: 
ISBN Number: 
0094-8276
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Edition: 
Short Title: 
Accession Number: 
ISI:A1991FG82800003
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Abstract: 

This paper test three hypotheses for the origin of the tectosphere. Continental collision cannot explain the low metamorphic grade of crust that predates the tectosphere. Halfspace cooling and buoyant underplating can both fit the diamond age data, although underplating by buoyant subduction is the favored model. Thermal models provide a further test. If halfspace cooling formed the tectosphere, diamonds from 150 km depth will be at least 200 m.y. younger than diamonds from 190 km. If buoyant subduction formed the tectosphere, diamonds from 150 km depth will be the same age or older than diamonds from 190 km.

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Fg828Times Cited:23Cited References Count:44

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