Afsar, Filiz, Duda, J-P, Zeller, M, Verwer, K, Westphal, Hildegard ORCID: and Eberli, G P (2014) First report of sponge rhaxes in the Picún Leufú Formation (Tithonian–Berriasian), Neuquén Basin, Argentina. Göttingen Contributions to Geosciences, 77 . pp. 49-56. DOI

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The Picún Leufú Formation (Tithonian-Berriasian, Neuquén Basin, Argentina) comprises mixed carbonate-siliciclastic
rocks. Here we report the occurrence of rhaxes (microscleres of the sponge genus Rhaxella Hinde, 1890) in the Picún
Leufú Formation, which have formerly been misinterpreted as calcispheres. Furthermore, the meaning of the microscleres
with respect to sedimentary environments and diagenesis in the Picún Leufú Formation is briefly evaluated. The
rhaxes in the Picún Leufú Formation are highly abundant (up to 80–90 % of the components) and occur in various facies
ranging from the proximal lagoon to the outer inner ramp, all representing shallow water environments. Diagenetic
processes linked to the rhaxes probably have a significant impact on reservoir qualities in different parts of the Picún
Leufú Formation.

Document Type: Article
Programme Area: UNSPECIFIED
Research affiliation: Biogeochemistry and Geology > Geoecology & Carbonate Sedimentology
Refereed: Yes
Open Access Journal?: No
Date Deposited: 12 Aug 2019 16:29
Last Modified: 01 Oct 2020 12:59

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