The Westernmost Tethys Blog Geology mapping, basin analysis and 3D modeling

12/17/2019

New model for the Betic Flysch Basin

Filed under: Betics,Campo de Gibraltar — Tags: , — messinianalicante @ 1:06 PM

The Flysch Complex extends, with equivalent stratigraphic and tectonic features, from the Betic Cordillera to the Rif, Argelian and Tunisian Tells, Sicily, Calabria and the southern-central Apennines. In the Betic Chain, it extends from the Campo de Gibraltar to the Vélez Rubio-Lorca region. This complex is a thrust-and-fold system (when structurally organised) or a tectonosedimentary mélange (when showing a rather chaotic structure). In the western Betic Cordillera, the Campo de Gibraltar Flysch Complex widely overthrusts the External Zones and, in turn, the Alborán Domain (Frontal Units in particular) thrusts onto it.

The Flysch Complex is mainly made of Lower Cretaceous to lower Burdigalian turbiditic siliciclastic (and subordinately carbonatic) sandstones interlayered with varicoloured clays. Since the latest Oligocene the successions show synorogenic character.

The Cretaceous successions of the Alborán (internal domain in the figure) domain record the post-rift evolution of the proximal to distal parts of a divergent Tethyan paleomargin, while those of the Campo de Gibraltar Flysch Complex record the evolution of the oceanic basin. The Alborán and the Campo de Gibraltar Flysch Complex domains were later transformed into a convergent continental margin (Oligocene to Early Miocene) that later evolved to a collisional setting (Middle to Late Miocene).

Paleogeographic and geodynamic evolutionary model of the Western Mediterranean area during the deposition and deformation of the syn–orogenic deposits of the Flysch units.

Cite as: Jabaloy Sánchez, A., Martín-Algarra, A., Padrón-Navarta, J.A., Martín-Martín, M., Gómez-Pugnaire, M.T., López Sánchez-Vizcaíno, V., Garrido, C.J., 2019. Lithological Successions of the Internal Zones and Flysch Trough Units of the Betic Chain, in: Quesada, C., Oliveira, J.T. (Eds.), The Geology of Iberia: A Geodynamic Approach: Volume 3: The Alpine Cycle. Springer International Publishing, Cham, pp. 377–432. https://doi.org/10.1007/978-3-030-11295-0_8

12/13/2019

Jimenez de Cisneros exhibition at Crevillent

Filed under: Sin categoría,Tectonosedimentary model — Tags: , — messinianalicante @ 2:07 PM

In the Crevillent town takes place an exhibition on the geologist Daniel Jimenez de Cisneros celebrating the 100 years of the publication of the first geological study of the Crevillent Sierra.

The University of Alicante has been collaborating in the exhibit 15-years after the 2004-tribute-simposium to Don Daniel Jimenez de Cisneros. The link bellow show two videos made for the event.

 

Catoon trailer:

 

link to the facsimil-book published:

www.academia.edu/41114909/

11/19/2019

shallow water stratified simulation

Filed under: simulation — Tags: , — messinianalicante @ 2:28 PM

The computational simulation of shallow stratified fluids is a very active research topic because these types of systems are very common in a variety of natural environments. The simulation of such systems can be modeled using multilayer shallow-water equations but do impose important computational requirements, especially when applied to large domains.

General Purpose Computing on Graphics Processing Units (GPGPU) has become a vivid research field due to the arrival of massively parallel hardware platforms (based on graphics cards) and adequate programming frameworks which have allowed important speed-up factors with respect to not only sequential but also parallel CPU based simulation systems.

In this work we present simulation of shallow stratified fluids with an arbitrary number of layers using GPUs. The designed system does fully adapt to the many-core architecture of modern GPUs and several experiments have been carried out to illustrate its scalability and behavior on different GPU models. We propose a new multilayer computational scheme for an underlying 2D mathematical model. This scheme is capable of handling an arbitrary number of layers. The system adds no overhead when used for two-layer scenarios, compared to an existing 2D system specifically designed for just two layers.

In this image we show a scheme for the initial configuration of a 6 layers simulation, along with a screenshot of the program.

The GPU computes the evolution in time of the interfaces between several layered fluid types (for a given initial configuration) and displays those interfaces as solid surfaces, as soon as the output from each computing step is available. The user can rotate the view interactively, so he can better observe the layers’ evolution.

Here you can view two screen-shots taken from the simulation program while running. First one the initial layers configuration is shown.

Then It is shown the resulting layers configuration after the simulation has been running for some time.

These screen captured videos (see links below) show the simulation program running in real-time, for various scenerarios. You can observe how the user is able to manipulate the view:

https://youtu.be/MXl6b675uXQ

 

Cite as:  Miguel Lastra, Manuel J. Castro Díaz, Carlos Ureña, Marc de la Asunción (2017):  Efficient multilayer shallow-water simulation system based on GPUs. Mathematics and Computers in Simulation, Volume 148, 2018,  48-65. DOI: https://doi.org/10.1016/j.matcom.2017.11.008

11/12/2019

Field trip to Granada

Filed under: Betics — Tags: , — messinianalicante @ 3:03 PM

Students of the third course of Geology of the Alicante University within the subject of Mapping 2: visit Benalúa in the Guadix basin.

The visit took place from October 23th until 26th of 2019 and the professor in charge was Manuel Martín-Martín.

 

10/29/2019

Regional geology field trip to Teruel

Filed under: Iberian range,Paleozoic — Tags: , , — messinianalicante @ 6:36 PM

Students of the third course of Geology of the Alicante University within the subject of Regional Geology: visit Jarafuel triassic section, Aguaton jurassic section, Murero paleontological site, Fombuena section, Santa Cruz Paleozoic Seas Museum, Ojos Negros Mine, and Orea-Checa road Hirnatian section.

Student in the Aguatón “tunnel” section

The visit took place from 16 to 19 October of 2019 and the professors in charge were Juan Alberto Pérez-Valera and José Enrique Tent-Manclús.

Zoophycos found in the Devonian Santa Cruz de Nogueras Formation, near the village of Santa Cruz de Nogueras. The specimen is now in the Paleozoic Seas Museum.

10/25/2019

Tectonic breakup in the Eastern Betic zone

Six Paleogene-Aquitanian successions have been reconstructed in the Alicante area (eastern External Betic Zone). The lithofacies association evidences “catastrophic” syn-sedimentary tectonic processes consisting of slumps, mega-olisthostromes, “pillow-beds” and turbiditic deposits  (Figure 1).

Figure 1. Field photos of the main macro-tectofacies found in the study area (see text for details). (A) A typical Lower Eocene sequence of the Villafranqueza section. (B) Calcarenite turbidite with convolute bedding (Lower Eocene, Villafranqueza). (C) Two Oligocene carbonate turbiditic channelized bodies (Busot). (D) Oligocene conglomeratic bed with erosional base and reverse grading of clasts, typical of debris flow deposits (Busot). (E) Oligocene slumped level and pillow-beds (Busot). (F) Oligocene mega-flute casts indicating a northwestwards-directed paleocurrents (Relleu). (G) Oligocene pillow-beds (Relleu). (H) Oligocene mega-olisthostrome with huge blocks (Playa Nudista). (I) Slumped megabed (Playa Nudista).

This kind of sedimentation is related to unconformity surfaces delimiting sequence and para-sequence cycles in the stratigraphic record (Figure 2).

Figure 2. Unconformities, associated gaps of the Eocene and Oligocene-Miocene depositional sequences compared with the sedimentary cycles of (Vera, 2000). The figure shows a basement tectonic interpreted as folding during the Eocene and blind thrust during the Oligocene-Aquitanian. The different evolutionary trends are discussed in the text.

The data compiled have enabled the reconstruction of the Paleogene-Aquitanian paleogeographic and geodynamic evolution of this sector of the External Betics. During the Eocene the sedimentary basin is interpreted as a narrow trough affected by (growth) folding related to blind thrust faulting with a source area from the north-western margin, while the southeastern margin remained inactive. During the Oligocene-Aquitanian, the sourcing margin became the southeastern margin of the basin affected by a catastrophic tectonic (Figure 3).

Figure 3. Paleogeographic-geodynamic model of the Alicante Trough during Eocene and Oligocene-Miocene times.

The activity of the margins is identified from specific sediment sources area for the platform-slope-troughsystem and from tectofacies analysis. The southeastern South Iberian Margin is thought to be closer to the Internal Betic Zone, which was tectonically pushing towards the South Iberian Margin. This pushing could generate a lateral progressive elimination of subbetic paleogeographic domains in the eastern Betics (Figure 4).

Figure 4. Synthetic Oligocene-Aquitanian paleogeographic-geodynamic model proposed for the western.

This geodynamic frame could explain the development of such “catastrophic” tectono-sedimentary processes during the Late Oligocene-Early Miocene.

Cite as: Guerrera, F. and Martín-Martín, M. (2014): Paleogene-Aquitanian tectonic breakup in the Eastern External Betic Zone (Alicante, SE Spain). Revista de la Sociedad Geológica de España, 27(1): 271-285.

 

10/07/2019

Nearshore Mid-Triassic Zoophycos

Filed under: Iberian range,Tethys — Tags: , , — messinianalicante @ 12:53 PM

 Zoophycos is a well-known trace fossil common throughout the Phanerozoic. Paleozoic forms show important differences in morphology and habitat distribution with respect to the Jurassic, Cretaceous, and Cenozoic ones. Therefore, Early–Middle Triassic is considered a crucial time-span for the understanding of the evolution of this trace fossil. So far, Early Triassic  Zoophycos is unknown and Middle Triassic forms were recorded only in deposits from Thuringia. The morphology and paleoenvironment of  Zoophycos from the middle–upper Muschelkalk of the Iberian Range is herein described.

Zoophycos ichnoassemblage. Note the very small dimensions and poor vertical development of the trace fossils. Top view of a well-preserved Zoophycos. The flower-shaped outline is well visible as is the apex in the central part of the structure.

 

The best-preserved trace fossils occur in a dolomicritic bed Ladinian in age, and are represented by small forms with a subcircular, slightly lobed outline and very little penetration depth. They were deposited in a very shallow, quiet-water environment with transition to supratidal/emerged areas. The low diversity of both trace fossils and skeletal remains point to stressful conditions related to strong salinity variations and/or poor water circulation. A comparison was made with  Zoophycos from Anisian deposits of the Muschelkalk in Germany. This showed that both forms are quite simple and penetrate only the shallowest tiers, although they are different in whorl outline and lobe shape.

Reconstruction of the most common Zoophycos form of the Jarafuel section. W lobe width, L lobe length, H height of the whole structure.

This confirms that, notwithstanding the morphological variability of this group,  Zoophycos still maintained a quite simple structure in the Triassic. A shallow-water environment was deduced for both localities, confirming that at least until the Early Jurassic  Zoophycos had not definitively migrated toward deep-water areas.

Cite as: Giannetti, A., Tent-Manclús, J. E. y Baeza-Carratalá, J. F. (2017): New evidence of nearshore Mid-Triassic Zoophycos: morphological and paleoenvironmental characterization. Facies, 63,16: 1-12. DOI : 10.1007/s10347-017-0498-8

09/23/2019

Jiménez de Cisneros course field trip to the Crevillente Sierra

Filed under: Betics — Tags: , , — messinianalicante @ 11:03 AM

The field trip of the he summer school course of the University Miguel Hernandez  entitled “Jimenez de Cisneros, pioneer in the geological and paleontological investigation in the Southern Alicante” took place on september 5th, 2019.

The participants visit the Los Molinos educative center and then waked along the dirt road to the Pouet de la Mel spring.

The fist photography show the conductor of this field trip will be our collegue José Enrique Tent-Manclús teaching the finimessinian transgressive surface on the background of the picture.

The second fotography show the all participants in the field trip near the Pouet the la Mel spring with the Sierra de Crevillente Jurassic at the back.

More information about the Crevillente course here.

09/01/2019

Tethyan to Mediterranean Evolution

Filed under: Betics,Tethys — Tags: — messinianalicante @ 5:49 PM

Message from the Guest Editor

Dear Colleagues,

Several geological modeling studies on the geodynamic and paleogeographic Alpine (Eo-Alpine during the Cretaceous–Paleogene; Neo-Alpine during the Oligocene– Miocene) evolution of the Mediterranean have been published without consensus in the last four decades. Therefore, a Special Issue dedicated to “Tethayan to Mediterranean evolution” seems justified. Studies that consider the geodynamic and/or paleogeographic evolution of the entire Mediterranean area or a part of this area will be welcome. The proposal can be focused on stratigraphic, sedimentological, petrographic, or tectonic data, or geophysical interpretations and reconstructions based on principles of Plate Tectonics using GPlates or similar software. The papers that are published in this Special Issue can contribute to clarifying and updating the state of our knowledge about this controversial theme.

Message from the Editorial Board

T h e Journal of Marine Science and Engineering (JMSE; ISSN 2077-1312) is an international peer-reviewed open access journal which provides an advanced forum for studies related to marine science and engineering. The journal aims to provide scholarly research on a range of topics, including ocean engineering, chemical oceanography, physical oceanography, marine biology and marine geosciences. We invite you to publish in our journal sharing your important research findings with the global ocean community.

Open Access: free for readers, with article processing charges (APC) paid by authors or their institutions.

High visibility: Indexed in the Science Citation Index Expanded in Web of Science, in Inspec (IET) and in Scopus.

CiteScore (2018 Scopus data): 1.76, which equals rank 30/92 in ‘Ocean Engineering’, rank 105/288 in ‘Civil and Structural Engineering’ and rank 77/203 in ‘Water Science and Technology’.

 

Guest Editor:

Prof. Dr. Manuel Martín-Martín

Earth sciences and environment

Department (University of Alicante). Campus Universitario del San Vicente del Raspeig, AP- 99, 03080 Alicante, Spain

manuel.martin.m3@gmail.com

Deadline for manuscript submissions:

10 March 2020

08/28/2019

Jiménez de Cisneros tribute in Crevillente

Filed under: Sin categoría — messinianalicante @ 2:22 PM

On september 5th of 2019 there will be a field trip (17:30 to 21:00)  organized under the summer school course of the University Miguel Hernandez  entitled “Jimenez de Cisneros, pioneer in the geological and paleontological investigation in the Southern Alicante”.

More information about the Crevillente course here.

The participant will see the southern section of the Crevillente Sierra from Los Molinos educative center to the Pouet de la Mel spring. Visiting the neogene cover, the Els Pontets diapir, and the Mesozoic carbonatic rocks of the Crevillente Sierra.

The conductor of this field trip will be our collegue José Enrique Tent Manclús.

Landscape of the Crevillente Sierra taken at the early XXth century by Daniel Jiménez de Cisneros. The mountain, “el Frare” viewed from the southern side of the Moeixa.

« Newer PostsOlder Posts »

Powered by WordPress