Factors Controlling Oncoid Distribution in the Inner Areas of a Late Kimmeridgian Carbonate Ramp (Northeast Spain)
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2019
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Sequero, C., Bádenas, B., & Aurell, M. (2019). Factors controlling oncoid distribution in the inner areas of a late kimmeridgian carbonate ramp(Northeast spain). En M. Boughdiri, B. Bádenas, P. Selden, E. Jaillard, P. Bengtson, & B. R. C. Granier (Eds.), Paleobiodiversity and Tectono-Sedimentary Records in the Mediterranean Tethys and Related Eastern Areas (pp. 171-174)
Abstract
The factors controlling the oncoid distribution in the interior areas of a latest Kimmeridgian shallow carbonate ramp were examined based on a detailed sedimentological and petrographic analysis of the upper sequence of the Higueruelas Formation (Iberian Basin, Northeast Spain). Four types of oncoids are defined: small micrite-dominated type I and II oncoids are generally found in low proportion in all sub-environments (from backshoal/washover, lagoon to intertidal). Large Bacinella-dominated type III and IV oncoids predominate in low-energy lagoonal areas. Variable energy water, oligotrophic conditions and probably low sedimentation rates controlled oncoid growth and distribution, thus highlighting their potential as palaeo-environmental proxies.