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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12 p, 5.9 MB
An overview of environmental forensics / Philp, R. P. (University of Oklahoma. School of Geology and Geophysics)
Environmental forensics has emerged as an important area of environmental studies over the past two decades. There are two basic aspects to any environmental investigation. The first being a conventional approach where the standard EPA (Environmental Protection Agency) methods are used to determine concentrations of selected compounds released into the environment. [...]
2014 - 10.1344/GeologicaActa2014.12.4.7
Geologica acta, Vol. 12 Núm. 4 (december 2014) , p. 363-374  

17 p, 2.8 MB
Organic and mineral matter changes due to oil generation, saturation and expulsion processes based on artificial maturation experiments / Souza, I. V. A. F. (PETROBRAS, CENPES (Rio de Janeiro, Brasil)) ; Araújo, C. V. (PETROBRAS, CENPES (Rio de Janeiro, Brasil)) ; Menezes, T. R. (PETROBRAS, CENPES (Rio de Janeiro, Brasil)) ; Coutinho, L. F. C. (PETROBRAS, CENPES (Rio de Janeiro, Brasil)) ; Binnotto, R. (PETROBRAS, CENPES (Rio de Janeiro, Brasil)) ; Spigolon, A. L. D. (PETROBRAS, CENPES (Rio de Janeiro, Brasil)) ; Fontes, R. A. (PETROBRAS, CENPES (Rio de Janeiro, Brasil)) ; Santos Neto, E. V. (PETROBRAS, CENPES (Rio de Janeiro, Brasil)) ; Rondon, N. D. V. F. (Universidade Federal do Rio de Janeiro. Instituto de Geociências) ; Mendoça Filho, J. G. (Universidade Federal do Rio de Janeiro. Instituto de Geociências)
Hydrous pyrolysis experiments were conducted on immature organic-rich rock with type-I kerogen to evaluate petroleum generation, saturation and expulsion processes. The experiments were carried out under isothermal conditions at ten different temperatures (280° through 360°C) for nine different time spans between 18 and 144h. [...]
2014 - 10.1344/GeologicaActa2014.12.4.6
Geologica acta, Vol. 12 Núm. 4 (december 2014) , p. 351-362  

9 p, 1.5 MB
Is there a pre-Cretaceous source rock in the Colombia Putumayo Basin? : clues from a study of crude oils by conventional and high resolution geochemical methods / Martínez, M. (Ecopetrol (Bogotá, Colòmbia)) ; Márquez, R. (Ecopetrol, ICP (Bucaramanga, Colòmbia)) ; Gutiérrez, G. (Ecopetrol (Bogotá, Colòmbia)) ; Maya, L. (Ecopetrol (Bogotá, Colòmbia)) ; Mora, C. (Gems S.A. (Bogotá, Colòmbia)) ; Guzmán, W. (Gems S.A. (Bogotá, Colòmbia)) ; Moldowan, J. M. (Stanford University)
A geochemical characterization of sixteen crude oil samples from the Putumayo Basin, southern Colombia, was carried out. This basin is located to the north of Ecuador’s Oriente Basin, one of the most prolific hydrocarbon basins in South America. [...]
in the Putumayo Basin can be achieved. Newly available geochemical technology shows evidence that these crude oils originated from Late Cretaceous source rocks. The novel application of an age-related biomarker, the C25-highly branched isoprenoid, has constrained the age of the principal source of all these oils as Late Cretaceous or younger. [...]

2014 - 10.1344/GeologicaActa2014.12.4.5
Geologica acta, Vol. 12 Núm. 4 (december 2014) , p. 345-350  

17 p, 2.1 MB
Characterization of asphaltic oil occurrences from the southeastern margin of the Basque-Cantabrian Basin, Spain / Marín, P. (Universitat de Barcelona. Department de Geologia, Petrologia i Prosprecció Geològica) ; Márquez, G. (Universidad de Huelva. Departmento de Ingeniería Minera, Mecánica y Energética) ; Gallego, J. R. (Universidad de Oviedo. Departmento de Explotación y Prospección de Minas) ; Permanyer, A. (Universitat de Barcelona. Department de Geologia, Petrologia i Prosprecció Geològica)
A geochemical investigation has been undertaken on biodegraded hydrocarbons in outcropping reservoirs of the south-eastern margin of the Basque-Cantabrian Basin (Álava sector). The aims of the study were the characterization of the geochemical features and biodegradation level of these hydrocarbons, and the evaluation of their resemblance to oils from the Ayoluengo onshore oil field by means of isotopic analyses and gas chromatography-mass spectrometry techniques. [...]
2014 - 10.1344/GeologicaActa2014.12.4.4
Geologica acta, Vol. 12 Núm. 4 (december 2014) , p. 327-342  

19 p, 377.5 KB
Components and processes affecting producibility and commerciality of shale resource systems / Jarvie, D. M. (TCU Energy Institute and Worldwide Geochemistry (Humble, Estats Units d'Amèrica))
Unconventional shale resource systems have provided North America with abundant energy supplies and reserves for present and future decades. This energy resource was largely overlooked until the new millennium. [...]
2014 - 10.1344/GeologicaActa2014.12.4.3
Geologica acta, Vol. 12 Núm. 4 (december 2014) , p. 307-325  

20 p, 3.3 MB
Subduction consequences along the Andean margin : thermal and topographic signature of an ancient ridge subduction in the Marañón Basin of Perú / Baudino, R. (Repsol Exploration S.A. (Madrid)) ; Hermoza, W. (Repsol USA (The Woodlands, Estats Units d'Amèrica))
All along the eastern border of the Andes lie foreland basins that are among the most prolific hydrocarbon provinces of the world. Their Cenozoic evolution was controlled by the Andean uplift and its consequences on deformation and sedimentation. [...]
2014 - 10.1344/GeologicaActa2014.12.4.2
Geologica acta, Vol. 12 Núm. 4 (december 2014) , p. 287-306  

18 p, 3.4 MB
Distribution and origin of natural gas leakage in the Colorado Basin, offshore Argentina Margin, South America : seismic interpretation and 3D basin modelling / Anka, Z. (GFZ- German Research Centre for Geosciences (Potsdam, Alemanya)) ; Loegering, M. J. (GFZ- German Research Centre for Geosciences (Potsdam, Alemanya)) ; di Primio, R. (GFZ- German Research Centre for Geosciences (Potsdam, Alemanya)) ; Marchal, D. (Petrobras Argentina S.A.) ; Rodríguez, J. F. (Petrobras Argentina S.A.) ; Vallejo, E. (YPF Tecnología S.A. (Buenos Aires, Argentina))
The detailed analysis of a dense 2D seismic reflection dataset and data from 8 exploration wells, allowed us to identify, map out and characterize possible indications of past and present-day hydrocarbon leakage (i. [...]
2014 - 10.1344/GeologicaActa2014.12.4.1
Geologica acta, Vol. 12 Núm. 4 (december 2014) , p. 269-285  

2 p, 700.4 KB
Foreword : ALAGO Special Publication: Selected Contributions from the XIII Congress / Baudino, Roger ; Permanyer, Albert
Geologica acta, Vol. 12 Núm. 4 (december 2014) , p. 1-2  

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 - 10.1344/GeologicaActa2014.12.3.6
Geologica acta, Vol. 12 Núm. 3 (September 2014) , p. 239-267  

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 - 10.1344/GeologicaActa2014.12.3.5
Geologica acta, Vol. 12 Núm. 3 (September 2014) , p. 227-237