An enigmatic kilometer-scale concentration of small mytilids (Late Miocene, Guadalquivir Basin, S Spain)

Aguirre, Julio; Braga, Juan C.; Martín, José Manuel Baltuille; Puga‐Bernabéu, Ángel; Pérez-Asensio, José N.; Sánchez-Almazo, Isabel; Génio, Luciana

doi:10.1016/j.palaeo.2015.07.015

Cited by 15 publications

(14 citation statements)

References 130 publications

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“…Therefore, the dominant coralline algal association indicates that rhodolith beds formed in middle-ramp settings, most likely at about 40-50 m of water depth. The presence of the serpulid Ditrupa, a calcified worm typically inhabiting in deep-water settings of shelves (Le Loc'h et al, 2008;Aguirre et al, 2015), is consistent with this paleobathymetric interpretation.…”

Section: Discussionsupporting

confidence: 75%

Middle Miocene (Serravallian) rhodoliths and coralline algal debris in carbonate ramps (Betic Cordillera, S Spain)

Aguirre

Braga

2022

Front. Earth Sci.

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Serravallian (middle Miocene) coralline algal assemblages at the southern margin of the Guadalquivir Basin (southern Spain) occur as rhodoliths preserved in situ or very close to their growth habitats (autochthonous–parautochthonous assemblages) and also as reworked remains (allochthonous assemblages). The former assemblages consist of spherical rhodoliths built up by encrusting to warty plants and also of large fragments of branches, whereas the latter are mostly unrecognizable small fragments occurring in channeled packstone–grainstone beds. In both cases, the most abundant components are members of the order Hapalidiales (Mesophyllum roveretoi, Mesophyllum sp., Lithothamnion ramosissimum, and less frequently Phymatolithon group calcareum and Lithothamnion group corallioides). Laminar growths of Lithoporella minus and branches of Spongites group fruticulosus and Sporolithon sp. occur very rarely. There are also anecdotal records of Subterraniphyllum thomasii, extending its upper stratigraphic range up to the Serravallian in the western Tethys. The autochthonous–parautochthonous coralline algal assemblages formed in a middle ramp, at several tens of meters of water depth, as suggested by the dominance of Hapalidiales. The allochthonous assemblages represent fragments of coralline algae derived from the middle ramp and redeposited in deeper settings, most likely the outer ramp, due to storm-generated currents.

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Section: Discussionsupporting

confidence: 75%

Middle Miocene (Serravallian) rhodoliths and coralline algal debris in carbonate ramps (Betic Cordillera, S Spain)

Aguirre

Braga

2022

Front. Earth Sci.

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“…Graveyards of this mytilid have been found in other parts of the Alboran Sea, mainly at Chella Bank [96] and at the Alboran ridge (between 100-120 m) [99]. Graveyards of other mytilids have been detected in upper Miocene out cropped carbonates in a NE-SW trending belt (42 km long and 1.5-8 km wide) along the so-called El Alcor topographic high (Guadalquivir Basin, S Spain) [101]. In the M. modiolus graveyards of the Alboran Sea, remains of other bivalve species were detected, including Panomya norvegica and large individuals of Mytilus edulis [99].…”

Section: Potential Main Framework-building Organisms Of the Moundsmentioning

confidence: 99%

Morphosedimentary, Structural and Benthic Characterization of Carbonate Mound Fields on the Upper Continental Slope of the Northern Alboran Sea (Western Mediterranean)

et al. 2022

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Carbonate mounds clustering in three fields were characterized on the upper continental slope of the northern Alboran Sea by means of a detailed analysis of the morphosedimentary and structural features using high-resolution bathymetry and parametric profiles. The contemporary and past benthic and demersal species were studied using ROV underwater imagery and some samples. A total of 325 mounds, with heights between 1 and 18 m, and 204 buried mounds were detected between 155 to 401 m water depth. Transparent facies characterize the mounds, which root on at least six erosive surfaces, indicating different growth stages. At present, these mounds are covered with soft sediments and typical bathyal sedimentary habitat-forming species, such as sea-pens, cerianthids and sabellid polychaetes. Nevertheless, remains of colonial scleractinians, rhodoliths and bivalves were detected and their role as potential mound-forming species is discussed. We hypothesized that the formation of these mounds could be related to favorable climatic conditions for cold-water corals, possibly during the late Pleistocene. The occurrence on top of some mounds of abundant rhodoliths suggests that some mounds were in the photic zone during minimum sea level and boreal guest fauna (e.g., Modiolus modiolus), which declined in the western Mediterranean after the Termination 1a of the Last Glacial (Late Pleistocene).

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“…A, geological sketch of the Betic Cordillera showing the Guadalquivir Basin (modified from Aguirre et al . 2015). B, detailed geological map of the study area (modified from Pérez‐Asensio et al .…”

Section: Figmentioning

confidence: 99%

Quantitative palaeobathymetric reconstructions based on foraminiferal proxies: a case study from the Neogene of south‐west Spain

Pérez-Asensio

2021

Palaeontology

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Quantitative palaeobathymetric reconstructions based on foraminiferal proxies have been used in a wide variety of geological studies on tectonic, climatic and environmental changes in sedimentary basins. However, palaeo‐water‐depth estimates are frequently biased due to taphonomic processes (dissolution, transport) as well as local conditions (primary productivity, oxygen content, and organic matter fluxes). This study evaluated the level of reliability of three commonly used transfer equations based on planktic and benthic foraminiferal proxies that produce different palaeobathymetric results, using Neogene sediments from the Guadalquivir Basin, south‐west Spain. The most trustworthy method involves removing abundant infaunal benthic foraminifera before applying the palaeo‐water‐depth equation based on benthic foraminiferal water‐depth ranges and presence/absence of species. This new approach provides sound palaeobathymetric results that improve estimations of long and short‐term relative sea‐level changes with negligible influence of taphonomic as well as ecological factors. When using one equation based on planktic/benthic ratios (P/B ratios), removing all infaunal benthic foraminiferal species improves the accuracy of P/B ratios, which yields more accurate palaeodepth reconstructions despite the low level of trustworthiness of this equation for both long and short‐term relative sea‐level variations.

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An enigmatic kilometer-scale concentration of small mytilids (Late Miocene, Guadalquivir Basin, S Spain)

Cited by 15 publications

References 130 publications

Middle Miocene (Serravallian) rhodoliths and coralline algal debris in carbonate ramps (Betic Cordillera, S Spain)

Middle Miocene (Serravallian) rhodoliths and coralline algal debris in carbonate ramps (Betic Cordillera, S Spain)

Morphosedimentary, Structural and Benthic Characterization of Carbonate Mound Fields on the Upper Continental Slope of the Northern Alboran Sea (Western Mediterranean)

Quantitative palaeobathymetric reconstructions based on foraminiferal proxies: a case study from the Neogene of south‐west Spain

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