期刊
SEDIMENTARY GEOLOGY
卷 247, 期 -, 页码 39-57出版社
ELSEVIER
DOI: 10.1016/j.sedgeo.2011.12.012
关键词
Norian; Triassic; Epicontinental carbonate platform; Volcaniclastics; Rifting; Betic Cordillera
类别
资金
- research group of the Junta de Andalucia [RNM 208, RNM 325]
- [CGL 2011-24408]
- [CGL 2008-03007]
- [RNM 03715]
The study of the Late Triassic Zamoranos Formation and the comparison to coeval carbonate units provides new insights into the evolution and palaeogeography of carbonate platforms during major rifting phases in the Earth's history. The platform carbonates of the Zamoranos Formation record the last major transgression during the Triassic, and document the initial phase of the CAMP volcanism in the external Zone of the Betic Cordillera. New palynological data from the lower part of the Zamoranos Formation indicate a Middle Norian age. The entire succession is built up by limestones, dolomites, and ferruginous red detrital deposits with volcaniclastic breccias. The carbonates are interpreted as tidal and shallow marine sediments, deposited under arid conditions. The red detrital deposits appear in coastal environments in relation to a volcanic event, which triggered hydrothermal processes in these deposits and started the massive magmatic event associated with the Central Atlantic Magmatic Province (CAMP). The Zamoranos Formation was also recognized in the SW part of the Valencia Triassic and is correlated to the Imon Formation (Iberian Ranges), to the Isabena Formation (Pyrenees) and to other carbonate units of the W Tethys realm (Aquitaine, Tunisian Atlas, West Carpathians). These units indicate that an extensive epicontinental platform developed during the Late Triassic. (C) 2012 Elsevier B.V. All rights reserved.
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