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Upper Aptian calcareous algae from Pădurea Craiului (Northern Apuseni Mountains, Romania)

Ioan I. Bucur ; Department of Geology, Center of Geological Integrated Studies, Babeş-Bolyai University
Bruno Granier ; Département des Sciences de la Terre, UFR des Sciences et Techniques, Université de Bretagne Occidentale (UBO)
Emanoil Săsăran ; Department of Geology, Center of Geological Integrated Studies, Babeş-Bolyai University

Sažetak

A study of calcareous strata previously assigned to the Barremian-Early Aptian interval in the northwestern part of Pădurea Craiului, (Apuseni Mountains), led to the identifi cation of a icropaleontological association indicative of a Late Aptian age. Unequivocal evidence for the Late Aptian assignment of these limestones is the presence throughout the sequence of two orbitolinid species, Mesorbitolina texana (ROEMER) and Mesorbitolina subconcava (LEYMERIE). The most interesting sections are located in the neighbourhood of Subpiatră, where both outcrops and a quarry facilitated detailed analyses. In this area, the Upper Aptian succession consists basically of three types of macrofacies: 1) limestone with rudists; 2) limestone with Bacinella and 3) limestone with corals, each of them showing several types of microfacies. Bacinella structures are the most common feature in the whole succession, irrespective of the macrofacies. This paper focuses on an algal association that was identifi ed in several levels within the succession. Dasycladalean algae are more frequent, and are commonly found in grain-dominated fabrics (mostly grainstone textures), in association with orbitolinid foraminifera and bioclasts of corals, rudists and gastropods. However, a few species are present only in mud-dominated fabrics (i.e. lower-energy intervals). The dasycladalean association from the Upper Aptian deposits of Pădurea Craiului is of special interest, for this group registered a dramatic decline at the Lower Aptian/Upper Aptian boundary, as confirmed by the relative scarcity of the Dasycladales in the Upper Aptian carbonate deposits.

Ključne riječi

calcareous algae; Upper Aptian; Pădurea Craiului; Apuseni Mountains; Romania

Hrčak ID:

30669

URI

https://hrcak.srce.hr/30669

Datum izdavanja:

22.12.2008.

Posjeta: 1.270 *