Geologica Acta
Geologica Acta (ISSN 1695-6133 / ISSN electrónico desde 1696 hasta 5728) es una revista institucional y de acceso abierto, internacional y con un perfil generalista de Ciencias de la Tierra. La revista acoge tanto artículos de tipo conceptual como regional, con especial énfasis en las zonas del Mediterráneo, Sur América y el Caribe, pero sin dejar de considerar contribuciones de cualquier región del mundo. Igualmente se incentiva la publicación de números temáticos que den a conocer los resultados de proyectos o reuniones científicas internacionales.
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2014-07-31
13:59

30 p, 13.1 MB
Late Carboniferous colonial Rugosa (Anthozoa) from Alaska / Fedorowski, J. (Adam Mickiewicz University. Institute of Geology) ; Stevens, C. H. (San José University. Department of Geology)
Late Carboniferous colonial corals from the Moscovian Saginaw Bay Formation and the underlying Bashkirian crinoidal limestone exposed on northeastern Kuiu Island and a nearby islet, part of the Alexander terrane in southeastern Alaska, are described and illustrated for the first time, and are supplemented by revision, re-description and re-illustration of most Atokan specimens from Brooks Range, northern Alaska, first described by Armstrong (1972). [...]
2014
Geologica acta, Vol. 12 Núm. 3 (September 2014) , p. 239-267  
2014-07-31
13:51

13 p, 1.4 MB
Clypeina tibanai, sp. nov. (Polyphysacea, Dasycladales, Chlorophyta), mid-Cretaceous green alga from the Potiguar Basin, Brazilian margin of the young South Atlantic Ocean / Granier, B. (The University of Kansas. Department of Ecology and Evolutionary Biology) ; Dias-Brito, D. (Universidade Estadual Paulista. Center for Geosciences Applied to Petroleum) ; Bucur, I. I. (Babeş-Bolyai University, Department of Geology and Center for Integrated Geological Studies)
The fossil genus Clypeina (Michelin, 1845) comprises some 40 species. We describe Clypeina tibanai, a new species from upper Albian–Cenomanian strata of the Potiguar, Brazil, characterised by closely set verticils of tubular, bended laterals. [...]
2014
Geologica acta, Vol. 12 Núm. 3 (September 2014) , p. 227-237  
2014-07-31
13:38

8 p, 1.5 MB
A new combined quasigeoid model in Tierra del Fuego / Gómez, M. E. (Universidad Nacional de La Plata. Departamento de Astrometría) ; Cogliano, D. del (Universidad Nacional de La Plata. Departamento de Astrometría) ; Perdomo, R. (Universidad Nacional de La Plata. Departamento de Astrometría) ; Hormaechea, J. L. (Universidad Nacional de La Plata. Departamento de Astrometría)
This work focuses on the development of a combined quasigeoid model for Tierra del Fuego province. The Equivalent Source Technique (EST) is applied together with the remove-compute-restore technique in order to combine gravity and GPS/levelling observations and to obtain a quasigeoid model. [...]
2014
Geologica acta, Vol. 12 Núm. 3 (September 2014) , p. 219-226  
2014-07-31
13:27

10 p, 1.9 MB
U–Pb zircon SHRIMP evidence for Cambrian volcanism in the Schistose Domain within the Galicia-Trás-os-Montes Zone (Variscan Orogen, NW Iberian Peninsula) / Farias, P. (Universidad de Oviedo. Departamento de Geología) ; Ordoñez-Casado, B. (Universidad de Oviedo. Departamento de Geología) ; Marcos, A. (Universidad de Oviedo. Departamento de Geología) ; Rubio-Ordoñez, A. (Universidad de Oviedo. Departamento de Geología) ; Fanning, C. M. (Australian National University. Research School of Earth Sciences)
SHRIMP U–Pb zircon analyses have shown the complexity of dating volcanic rocks due to the presence of inner cores within zircon crystals. Using the cathodoluminescence studies assisting ion microprobe analyses allow as to conclude that: the two low-grade metavolcanic samples from the Schistose Domain of the Galicia-Trás-os-Montes Zone in the northeast limb of the Verín-Bragança synform (NW Spain and NE Portugal) yield ages of 488. [...]
2014
Geologica acta, Vol. 12 Núm. 3 (September 2014) , p. 209-218  
2014-07-31
13:20

15 p, 8.3 MB
Reverse magnetic anomaly controlled by Permian Igneous rocks in the Iberian Chain (N Spain) / Calvín,P. Universidad de Zaragoza. Departamento. de Ciencias de la Tierra ; Casas, A. M. Universidad de Zaragoza. Departamento. de Ciencias de la Tierra ; Villalaín, J. J. (Universidad de Burgos. Departamento de Física) ; Tierz, P. Universidad de Zaragoza. Departamento. de Ciencias de la Tierra
Two important reverse dipolar magnetic anomalies in the Iberian Chain (Spain) are located over Permian igneous rocks. A detailed study of one of them, the Loscos magnetic anomaly, where the geological structure is well constrained, reveals that the source of the anomaly must be a reverse remanent magnetisation carried by igneous rocks, acquired during the period of the Kiaman reverse magnetic superchron. [...]
2014
Geologica acta, Vol. 12 Núm. 3 (September 2014) , p. 193-207  
2014-07-31
13:06

22 p, 3.0 MB
Paleogene evolution of the External Betic Zone and geodynamic implications / Guerrera, F. (Università degli Studi di Urbino "Carlo Bo". Dipartimento di Scienze della Terra, della Vita e dell’Ambiente) ; Mancheño, M. A. (Universidad de Murcia. Departamento de Química Agrícola, Geología y Edafología) ; Martín-Martín, M. (Universidad de Alicante. Departamento de Ciencias de la Tierra y Medio Ambiente) ; Raffaelli, G. (Università degli Studi di Urbino "Carlo Bo". Dipartimento di Scienze della Terra, della Vita e dell’Ambiente) ; Rodríguez-Estrella, T. (Universidad Politécnica de Cartagena. Departamento de Ingeniería Minera, Geologíca y Cartográfica) ; Serrano, F. (Universidad de Málaga. Departamento de Ecología y Geología)
Interdisciplinary studies combining field data (geological and tectonic mapping, lithostratigraphic reconstructions, lithofacies characterization, correlations and sampling) and laboratory analyses (biostratigraphy, chronostratigraphy, clay mineralogy and sandstone petrography) of eight Senonian-Paleogene successions from the Sierra de La Pila and Sierra de El Carche areas (Murcia province, SE Spain) belonging to the External Betic Zone are presented. [...]
2014
Geologica acta, Vol. 12 Núm. 3 (September 2014) , p. 171-192  
2014-07-08
13:05

20 p, 5.5 MB
Petrogenesis of Miocene volcanic arc rocks over the Chilean-Pampean flat-slab segment of the Central Andes constrained by mineral chemistry / Litvak, V. D. (Instituto de Estudios Andinos Don Pablo Groeber (Buenos Aires, Argentina)) ; Poma, S. (Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (Argentina))
Miocene arc volcanism is manifested widely in the Valle del Cura-El Indio belt region (29°30´–30° South latitude), in the southern Central Andes of Argentina and Chile. The magmas that fed this volcanism are well represented by the Cerro de las Tórtolas Formation, which is divided into two volcanic episodes based on petrographic, chemical and age differences: an older basaltic-andesitic event (16–14Ma) and a younger andesitic to dacitic (13–10Ma) one. [...]
2014
Geologica acta, Vol. 12, Núm. 2 (June 2014) , p. 151-170  
2014-07-08
12:57

14 p, 6.0 MB
Linkages between the southern Patagonia Pre-Permian basements : new insights from detrital zircons U-Pb SHRIMP ages from the Cerro Negro District / Permuy Vidal, C. (Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo) ; Moreira, P. (Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo) ; Guido, D. M. (Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo) ; Fanning, C. M. (The Australian National University. Research School of Earth Sciences)
The Patagonian basement rocks are dominated by Precambrian to Early Paleozoic metamorphic rocks intruded by Paleozoic granitoids. Recently discovered basement rocks in the Cerro Negro District are characterized mainly by quartz-muscovite-chlorite schists; the metamorphic grade reaches greenschist facies (biotite-garnet grade) with a regional S1 schistosity subparallel to the original sedimentary structure S0 and a secondary non-penetrative S2 foliation. [...]
2014
Geologica acta, Vol. 12, Núm. 2 (June 2014) , p. 137-150  
2014-07-08
12:47

9 p, 964.9 KB
European ornithomimosaurs (Dinosauria, Theropoda) : an undetected record / Allain, R. (Centre de Recherche sur la Paléobiodiversité et les Paléoenvironnements. Muséum National d’Histoire Naturelle (París, França)) ; Vullo, R. (Université Rennes) ; Le Loeuff, J. (Musée des Dinosaures (Espéraza, França)) ; Tournepiche, J. - F. (Musée d’Angoulême (Angoulême, França))
Early Cretaceous ornithomimosaurian theropod dinosaurs have been reported from various localities in Asia, whereas they remain poorly represented and extremely rare in North America, Africa and Europe. [...]
2014
Geologica acta, Vol. 12, Núm. 2 (June 2014) , p. 127-135  
2014-07-08
12:39

7 p, 1.0 MB
A potential record of a procolophonid parareptile from the Triassic of the Iberian Peninsula / Fortuny, J. (Institut Català de Paleontologia Miquel Crusafont) ; Bolet, A. (Institut Català de Paleontologia Miquel Crusafont) ; Sellés, A. G. (Institut Català de Paleontologia Miquel Crusafont) ; Galobart Lorente, Àngel (Institut Català de Paleontologia Miquel Crusafont)
Cranial and postcranial remains from the Middle Triassic of the Northeastern part of the Iberian Peninsula are reported and tentatively assigned to Procolophonidae. The finding is the first occurrence of a procolophonid parareptile in the Iberian Peninsula, representing the southernmost record of the group in Europe. [...]
2014
Geologica acta, Vol. 12, Núm. 2 (June 2014) , p. 121-126