Tectonic and liquefaction structures in the Loreto basin,Baja California (Mexico) : synsedimentary deformation along a fossil fault plane |
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| Authors: | Andrea Zanchi |
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| Institution: | Dipartimento di Scienze della Terra – Università degli Studi di Milano. via Mangiagalli 34, 20133 Milano. (Italia). |
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| Abstract: | AbstractComplex fault assemblages associated to liquefaction structures have been analyzed in a Pliocene basin located along the Gulf of California. The studied outcrop shows a fossil fault plane formed ill soft flat lying sediments. The liquefaction and fluidification structures have been recognized in voleaniclastic layers deposited ill a lagoonal environment and are potentially related to seismic wave shaking and to successive dewatering along fractures. This strati-graphic record is explained by the progressive development of a seismic fault zone, related to the transtensional regime still active in the Gulf. The present analysis can he considered as an useful case study for the reconnaissance of the different types of structures formed during synsedimentary deformation in hydroplastic conditions. |
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| Keywords: | Neotectonics Gulf of California transtension liquefaction paleo seismic activity synsedimentary déformation |
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