Facies mosaic in the inner areas of a shallow carbonate ramp (Upper Jurassic, Higueruelas Fm, NE Spain)

Sequero, C. ; Bádenas, B. (Universidad de Zaragoza) ; Aurell, M. (Universidad de Zaragoza)

Resumen: The internal facies and sedimentary architecture of an Upper Jurassic inner carbonate ramp were reconstructed after the analysis and correlation of 14 logs in a 1 × 2 km outcrop area around the Mezalocha locality (south of Zaragoza, NE Spain). The studied interval is 10–16 m thick and belongs to the upper part of the uppermost Kimmeridgian–lower Tithonian Higueruelas Fm. On the basis of texture and relative proportion of the main skeletal and non-skeletal components, 6 facies and 12 subfacies were differentiated, which record subtidal (backshoal/washover, sheltered lagoon and pond/restricted lagoon) to intertidal subenvironments. The backshoal/washover subenvironment is characterized by peloidal wackestone–packstone and grainstone. The lagoon subenvironment includes oncolitic, stromatoporoid, and oncolitic-stromatoporoid (wackestone and packstone) facies. The intertidal subenvironment is represented by peloidal mudstone and packstone–grainstone with fenestral porosity. Gastropod-oncolitic (wackestone–packstone and grainstone) facies with intercalated marl may reflect local ponds in the intertidal or restricted lagoon subenvironments. Detailed facies mapping allowed us to document 7 sedimentary units within a general shallowing-upward trend, which reflect a mosaic distribution, especially for stromatoporoid and fenestral facies, with facies patches locally more than 500 m in lateral extent. External and internal factors controlled this heterogeneity, including resedimentation, topographic relief and substrate stability, combined with variations in sea-level. This mosaic facies distribution provides useful tools for more precise reconstructions of depositional heterogeneities, and this variability must be taken into account in order to obtain a solid sedimentary framework at the kilometer scale..

Idioma: Inglés

DOI: 10.1007/s10347-018-0521-8

Año: 2018

Publicado en: FACIES 64, 2 (2018), 9 [23 pp]
ISSN: 0172-9179

Factor impacto JCR: 1.719 (2018)

Categ. JCR: PALEONTOLOGY rank: 15 / 56 = 0.268 (2018) - Q2 - T1
Categ. JCR: GEOLOGY rank: 14 / 46 = 0.304 (2018) - Q2 - T1

Factor impacto SCIMAGO: 0.704 - Geology (Q2) - Stratigraphy (Q2) - Paleontology (Q2)

Financiación: info:eu-repo/grantAgreement/ES/MINECO/CGL2014-53548-P
Financiación: info:eu-repo/grantAgreement/ES/MINECO/CGL2017-85038-P
Financiación: info:eu-repo/grantAgreement/ES/UZ/IUCA-H54

Tipo y forma: Artículo (PostPrint)

Área (Departamento): Área Estratigrafía (Dpto. Ciencias de la Tierra)