Title: SEDIMENTARY FACIES AND COMPOSITION OF JURASSIC VOLCANICLASTIC TURBIDITES AT CERRO EL CALVARIO
Abstract: A thick sequence of pre-Upper Jurassic volcaniclastic turbidites forms part of a middle Mesozoic island-arc complex exposed in the central Vizcaino Peninsula. The sequence overlies ophiolite of probable back-arc-basin affinity and consists of more than 1000 m of intercalated conglomerate, sandstone, and argillite that can be divided into four facies: (1) conglomerate, (2) thick-bedded sandstone, (3) thin-bedded sandstone, and (4) thin-bedded sandstone, siltstone, and argillite. The facies are similar to Mutti and Ricci Lucchi (1972) facies A through E of submarine-fan complexes and are arranged in thinning- and fining-upward megasequences that are similar to the facies associations ascribed to innerand middle-fan deposits. The lack of more distal facies associations suggests that the deposits represent modified submarine fans developed as proximal, coarse-grained debris aprons along a steep volcanic slope.
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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