ISSN:
0016-7835
Keywords:
Key words Triple junctions
;
Aracena metamorphic belt
;
Inverted metamorphic gradient
;
Amphibolites
;
Granulites
;
Hercynian belt
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
Notes:
Abstract New data on the petrology and structure of the Aracena metamorphic belt shows that this is a subduction-related, low-pressure/high-temperature complex developed by plate convergence at the north margin of Gondwana during the Paleozoic. The low-pressure, inverted metamorphic gradient in MORB-derived amphibolites resulted from heating from the continental hanging wall during subduction. This implies that the previous heating of the continental rocks was related to subduction of an oceanic ridge and the creation of a slab window beneath the continental margin. This slab window brought the asthenosphere in contact with the continental margin inducing a shallow thermal anomaly and partial melting of the lithospheric mantle resulting in boninite magmatism.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00192076
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