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marine geophysics on board a ship

Last February 15th, 2023, students in the third year of the  Geology Degree of the course “Geophysics and geophysical prospecting”, under the supervision of Professor José Enrique Tent Manclús, carried out practices aboard the “Rosa de Abril” boat from the Alicante harbor. The practice was show a Boomer High resolution reflexion equipment and a ROV. The picture show a student trying to understand the ROV commands.

Origin and evolution of the Neogene calcareous nannofossil Ceratolithus

Sediment samples of deep marine oceanic ODP boreholes from sites 999 in the Caribbean Sea and 1237 in the Eastern Pacific Ocean covering the period between 6 and 4.5 Ma have been studied with a focus on ceratolith evolution. Orthorhabdus rugosus is a nannolith with three blades (sinistral, median, and dextral) that first appeared during the Serravallian, it is not-birefringent in its stable orientation. It shows a high morphological variability time-interval at the end of the Messinian to the basal Pliocene (5.5 to 5 Ma) during which Ceratolithus (5.484 Ma) evolved. Changes occurred in the sinistral and median blades, whilst the dextral blade was reduced. Ceratolithus finifer n. comb is the first species of the evolutionary line. The nannolith stable position changed during its evolution, resulting in the older forms showing low birefringence and the younger ones moderate to high birefringence in the most stable orientation. Ceratolithus acutus, with an arrowhead shape, Ceratolithus armatus, and the morphologically distinct C. larrymayeri evolved from C. finifer with all three species showing high birefringence. The previous O. rugosus and C. finifer continued. Finally, C. armatus gives rise to C. cristatus. Ceratolithus atlanticus and C. tricorniculatus also evolved from C. finifer. All the species mentioned become extinct during the Pliocene except Ceratolithus cristatus that lives today. Detailed observations permit the analysis of the evolutionary trends of the group, possible mechanisms, patterns, and processes of speciation, and establish new criteria to define the species that, by their relative abundance and short geologic range, have permitted adjustment of biostratigraphic markers for this period.

Development of birefringence in the family Ceratolithaceae. Upper part, the first variability interval when Amaurolithus primus, Amaurolithus delicatus, and Nicklithus amplificus evolved from Orthorhabdus rugosus. As the median wing (in red) does not change its orientation, remaining perpendicular to the most stable position, pointing upwards, those species do not show birefringence. The lower part shows the O. rugosus second variability interval when Ceratolithus developed. The early forms, Ceratolithus finifer, show low birefringence as the c-axis/median wing (in red) incline towards the dextral wing (in green). In the later morphotypes the c-axis/ median wing rotates, tilting the nannolith most stable position to the right, and so showing moderate to high birefringence. Finally, when the lath-end of the sinistral wing (in blue) of C. acutus rotates upwards, the nannolith most stable position tilts further to the right orienting the c-axis parallel to it, producing the high birefringence characteristic of Ceratolithus.

Cite as: Lancis, C., Tent-Manclús, J.-E., Flores, J.-A., 2024. Origin and evolution of the Neogene calcareous nannofossil Ceratolithus. Mar. Micropaleontol. 186, 102310. https://doi.org/https://doi.org/10.1016/j.marmicro.2023.102310

Sorbas field trip Alicante Marine Sciences 2023

This year the students of the third course of Marine sciences of the Alicante University visit the Mesa de Rodan, Cabo de Gata, and Sorbas basin on November 2nd and 3th of 2023.

The picture show the student visiting the Sorbas gypsum karst (Almeria).

The professors of the subject were  Antonio Estévez, Manuel Martín-Martín, David Bonomo, and José Enrique Tent-Manclús.

Best article in the field of marine technology and renewable energy in the Martech workshop

Award for the best article in the field of marine technology and renewable energy sponsored by Nautilus Oceanica at the Martech 2023 congress, Tenth international workshop on marine technology, Jaume I University, Castellón de la Plana. For the article entitled: “Low cost USV development to study spring ponds” by Ronda, J. L., Benabdeloued, B. Y. N. and Tent-Manclús, J. E. belonging to the Department of Earth and Environmental Sciences and the Seismic Network of the Valencian Community (SISCOVA).

Award concession, from left to right: Alejandro Palmeriro Nautilus Oceanica representative, Raúl Marín Prades chairman of the organizing committee, Pedro José Sanz Valero del Irtesu, José Enrique Tent Manclús, Nassim Benabdeloued, Juan Leandro Ronda.

The article deals with the development of a USV (Unmanned Surface Vehicle) a surface unmanned ship for the study of springs. It is a small remote-controlled vehicle with a control post, from where it is manned. It has two cameras, one underwater and one frontal, which transmit real-time GPS location, also in real time, and bathymetry probe sensors and side-scan Sonar.

 

The USV and the authors of the work. From left to right: Juan Leandro Ronda, José Enrique Tent-Manclús y Nassim Benabdeloued

The authors with the USV team.

 

MOLICO-CV a thinkinazul Project

The project will study changes in the coast-line, coastal risk and coastal aquifers, an its logo is:

The leadership of the project is carried out by researches of the MIES is a Multidisciplinary Research Institute for Environmental Studies “Ramón Margalef” (Instituto Multidisciplinario para el estudio del Medio “Ramon Margalef”, IMEM in Spanish) of the Alicante University and integrate researches of 10 universities and research institutions.

The EU funded ThinkInAzul programme supported by MCIN (Ministerio de Ciencia e Innovación)  with funding from European Union NextGenerationEU (PRTR-C17.I1) and by Generalitat Valenciana

Rogério Portantiolo Manzolli (Universidad Autónoma Madrid), Claudi Blasco (Universidad Alicante), José Enrique Tent-Manclús (Universidad Alicante) and Carlos Arteaga Cardenau Universidad Autónoma Madrid) in Guardamar making a manual borehole.

Students of Alicante University do marine geology practice in Torrevieja

Last March 4th, 2023, students in the third year of the  Geology Degree carried out practices aboard the “Rosa de Abril” boat from the Torrevieja harbor . The practice was focused on different aspects of “Geophysics and geophysical prospecting”, under the supervision of Professor José Enrique Tent Manclús. This academic we have returned to sail  as before the pandemic.

Marine campaign to find the source of the earthquakes in the Patibulo fishing area (Alicante coast)

At 30 nautical miles to the E of Cabo de Santa Pola (about 55 km) there is a submarine seamount called by the southern Alicante fishermen as the area of the Patibulo (the Gallows). It is an area with a rocky and elevated seabed, with abundant fishing.

Curiously, not only are fish abundant, but from time to time the seismographs of the Alicante University Seismic Record Unit record earthquakes there and along the imaginary line that joins it with Cabo de Santa Pola, to the north of Tabarca Island. In the coastal area to the north of said island, an active fault has already been located through high-resolution seismic as a possible cause of these. It was missing to know if in the Patibulo, said fault continues or another one also active.

Throughout the year 2022, attempts have been made to reach the area from Torrevieja with marine seismic equipment to study the area. It started in the month of April and something always happened, a fuse, a cable, a blown chip, bad weather… After much insistence and returning empty-handed, on December 6, 7 and 8, there was a good weather window and the appliances worked. From the port of Torrevieja with the boat “Rosa de Abril”, we were making some data collection lines in the direction of the Patibulo and on the last day we reached our objective. Almost 80 km of data lines were obtained over 3 days.

El Patíbulo is the westernmost seamount of an alignment of elevations called Alicante Highs, after the geological map of the Alicante platform (Catafau Alcántara et al., 1994). There are at least three needles whose base is 300 m deep and which rise to about 135 m, the most to the W (Patíbulo). The second is the highest and reaches 125 m (some fishermen say 90 m), the third at 154 m. The image of the geological map of the Alicante platform is attached. To the north of these thresholds begins a submarine canyon that is “unofficially” known as the “Alicante canyon” and that descends to the plain to the north of these.

Alicante Heights, this profile does not pass through the tops of the heights, it is a bathymetric profile where some of them are located (Taken from Catafau Alcántara et al., 1994).

The high-resolution seismic image shows a fault scarp on the seafloor, indicating that the fault is currently active. The darker area marked by the plane is a more cemented area, probably due to the flow of fluids along the plane. Layered reflectors are also observed, indicating that they are sedimentary rocks and not volcanic rocks like other seamounts in the southern Balearic Islands.

Fault in the Gallows area. A fault scarp is observed on the surface of the seabed and its prolongation in depth. The layers on the right cut off at the fault. Raw image obtained during acquisition.

With the preliminary data that has been obtained, it can be said that the Patibulo is a structural height raised by faults. They are active because they protrude from the bottom and because it seems that they are associated with leaks of fluids that mineralize near the fault plane.

We look forward to studying the interesting data obtained.

Reference: Catafau Alcántara, E., Gaytán de Ayala y Bolín, M., Pereda Alonso, I., Vázquez Garrido, J.T., Wandossell Santamaría, J. (1994): Mapa geológico de la Plataforma Continental Española y Zonas adyacentes. Escala 1:200 000. Hoja nº 72-73(Elche-Alicante). ITGE, 73 p.

Field trip to Teruel

This academic year 2022-23 we have returned to Teruel Paleozoic as before the pandemic. The geology students of Alicante University third course within the subject of Regional Geology: visit Montealegre del Castillo triassic section (Albacete), Aguilon Jurassic section (Teruel), Murero Cambrian Rambla Valdemiedes section (Zaragoza), Luesma Ordovicic to Triassic section (Teruel), Santa Cruz de Nogueras museum “Paleozoic Seas Museum” (Teruel), Ojos Negros iron-ore quarry (Teruel) and Checa-Orea road Ordovicic-Silurian section (Guadalajara).

The picture shows all the students on the Tertiary erosional surface on top of the Murero section  (Zaragoza province).

Alicante University Student in Murero top section. Panoramic view of the Iberian Cordillera.

The second picture show students in the Murero Cambrian Rambla de Valdemiedes section.

Alicante University geology third course students in the Rambla de Valdemiedes, cambrian of Murero.

Field trip to Faro de Rondan (Almería)

This year the students of the third course of Marine sciences of the Alicante University visit the Sorbas basin, Cabo de Gata, and Mesa de Roldán on November 3th and 4th of 2022.

University of Alicante Marine Geology course students (2022-23).

The picture show the student visiting the Faro de la Mesa de Roldan  (the lighthouse).

The professors of the subject were  Antonio Estévez, Manuel Martín-Martín and José Enrique Tent-Manclús.

Thinkinazul meeting in Calpe

Last september 16th 2022 in the IMEDMAR facilities of the Universitat Católica de Valencia took place the first meeting of the WP1 of the Thinkinazul project.

The meeting did not start quite well because 3 days before the meeting a fire destroyed the entrance of the building so it had to be moved to the Calpe Nautic Club, Belliure brothers meeting room. It was our first meeting, our kicking point trying to find synergies with the different subgroups.