Geologica acta

Geologica acta Encontrados 7 registros  La búsqueda tardó 0.01 segundos. 
12 p, 2.5 MB High-frequency carbonate-siliciclastic cycles in the Miocene of the Lorca Basin (Western Mediterranean, SE Spain) / Thrana, C. (University of Bergen (Noruega). Department of Earth Science) ; Talbot, M. R. (University of Bergen (Noruega). Department of Earth Science)
The upper Miocene Parilla Formation, Lorca Basin, Spain, provides an example of stacked high-frequency cycles of mixed carbonates and siliciclastics. Cycles developed on a steep carbonate ramp bordering an alluvialfan system. [...]
2006 - 10.1344/105.000000348
Geologica acta, Vol. 4, Núm. 3 (2006) , p. 343-354  
29 p, 895.5 KB Combined analysis of different logs in quantification of exhumation and its implications for hydrocarbon exploration, a case study from Australia / Mavromatidis, A. (Petroleum Development LLC)
Exhumation in the Eromanga Basin of South Australia and Queensland has been quantified using the compaction methodology. The standard method of estimating exhumation using the sonic log has been modified and the adjusted sonic, the bulk density and neutron logs, have been used to estimate exhumation. [...]
2006 - 10.1344/105.000000349
Geologica acta, Vol. 4, Núm. 3 (2006) , p. 355-370  
6 p, 290.9 KB Late Triassic-early Jurassic Neotethyan evolution at Northern Gondwana (Jordan and Libya, Mediterranean region) / Makhlouf, I. M. (Hashemite University (Jordània). Department of Earth and Environmental Sciences)
The Early Mesozoic record of northern Gondwana was strongly influenced by sea level fluctuations during the opening of the Neotethys Sea. Detailed facies analysis of the Late Triassic / Early Jurassic Abu Shaybah Fm (Libya, western Mediterranean), and the Triassic Mukheiris Fm (Jordan, eastern Mediterranean) documents the transgressions and regressions that took place during the Neotethys opening. [...]
2006 - 10.1344/105.000000350
Geologica acta, Vol. 4, Núm. 3 (2006) , p. 371-376  
6 p, 577.9 KB The oldest lagonomegopid spider, a new species in Lower Cretaceous amber from Álava, Spain / Penney, D. (University of Manchester. Earth, Atmospheric and Environmental Sciences)
The new species Burlagonomegops alavensis (Araneae: Lagonomegopidae) is described from Lower Cretaceous (Aptian) amber from Álava (Basque Country), Spain. This is the first fossil spider to be described from this deposit and extends the known geological range of this family by approximately 15-20 Ma, from the previously oldest described lagonomegopid in Burmese amber. [...]
2006 - 10.1344/105.000000351
Geologica acta, Vol. 4, Núm. 3 (2006) , p. 377-382  
11 p, 528.6 KB Genesis of self-organized zebra textures in burial dolomites : displacive veins, induced stress, and dolomitization / Merino, E. (Indiana University. Department of Geological Sciences) ; Canals, A. (Universitat de Barcelona. Departament de Cristal·lografia, Mineralogia i Dipòsits Minerals) ; Fletcher, R.C. (Pennsylvania State University. Department of Geosciences)
The dolomite veins making up rhythmites common in burial dolomites are not cement infillings of supposed cavities, as in the prevailing view, but are instead displacive veins, veins that pushed aside the host dolostone as they grew. [...]
2006 - 10.1344/105.000000352
Geologica acta, Vol. 4, Núm. 3 (2006) , p. 383-393  
7 p, 265.0 KB A revised Ordovician age for the Miranda do Douro orthogneiss, Portugal. Zircon U-Pb ion-microprobe and LA-ICPMS dating / Bea, F. (Universidad de Granada. Departamento de Mineralogía y Petrología) ; Mntero, P. (Universidad de Granada. Departamento de Mineralogía y Petrología) ; Talavera, C. (Universidad de Granada. Departamento de Mineralogía y Petrología) ; Zinger, T. (Russian Academy of Sciences. Institute of Precambrian Geology and Geochronology)
The Miranda do Douro orthogneiss was believed to be the oldest magmatic rock of the Central Iberian Zone, on the base of a U-Pb discordia upper intercept of 618 ± 9 Ma. Nevertheless, new ion-microprobe and LA-ICPMS U-Pb zircon dating revealed that the crystallization age was 483 ± 3 Ma. [...]
2006 - 10.1344/105.000000353
Geologica acta, Vol. 4, Núm. 3 (2006) , p. 395-401  
5 p, 189.1 KB The Carboniferous System. Use of the new official names for the subsystems, series, and stages / Heckel, P.H. (University of Iowa. Department of Geoscience. Chair of SCCS) ; Clayton, G. (Trinity College Dublin. Department of Geology. Vice Chair of SCCS)
As a result of votes by the Subcommission on Carboniferous Stratigraphy [SCCS] that were ratified by the International Commission on Stratigraphy [ICS] and the International Union of Geological Sciences [IUGS] over the period 1999-2004, the official subdivision of the Carboniferous System has been substantially modified. [...]
2006 - 10.1344/105.000000354
Geologica acta, Vol. 4, Núm. 3 (2006) , p. 403-407  

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