A new type of active margin: the convergent-extensional margin,as exemplified by the Middle America Trench off Guatemala |
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| Authors: | Jean Aubouin Jacques Bourgois Jacques Azéma |
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| Institution: | Département de Géotectonique, UniversitéP. et M. Curie, T.26-E.1, 4, Place Jussieu, 75230 Paris Cédex 05France |
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| Abstract: | The results of DSDP Legs 67 and 84, during which a transect of holes was drilled across the Middle America Trench off Guatemala, show no accretion at the front of that subduction zone since early Eocene time. The tectonic evolution of the trench includes extensional structure on the landward as well as the seaward trench slopes. The Guatemalan margin is proposed as the model of a new type of active margin, the convergent-extensional active margin (CE margin). |
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