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Geologica acta

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Geologica acta 6 records found  Search took 0.02 seconds. 
1.
13 p, 7.4 MB Top-down structures of mafic enclaves within the Valle Fértil magmatic complex (Early Ordovician, San Juan, Argentina) / Castro Dorado, Antonio (Universidad de Huelva. Departamento de Ciencias de la Tierra) ; Martino, Roberto Donato (Universidad Nacional de Córdoba. Departamento de Geología) ; Vujovich, Graciela (Universidad de Buenos Aires. Departamento de Geología) ; Otamendi, Juan Enrique (Universidad Nacional de Río Cuarto. Departamento de Geología) ; Pinotti, Lucio Pedro (Universidad Nacional de Río Cuarto. Departamento de Geología) ; D'Eramo, Fabiana (Universidad Nacional de Río Cuarto. Departamento de Geología) ; Tibaldi, Alejandro (Universidad Nacional de Río Cuarto. Departamento de Geología) ; Viñao, Aldana (Universidad Nacional de Río Cuarto. Departamento de Geología)
Magmatic structures related to the mechanical interaction between mafic magmas and granitoids have been studied in the Valle Fértil calc-alkaline igneous complex, Argentina. Excepcional outcrops with vertical walls of more than 300 m high allow us the study of three-dimensional geometries of individual blobs of mafic magma as well as the geometry of pipe-like structures in which mafic microgranular enclaves are concentrated in more than 50 times the normal abundance in the granodiorite mass. [...]
2008 - 10.1344/105.000000252
Geologica acta, Vol. 6, Núm. 3 (Setembre 2008) , p. 217-229  
Detailed record - Creative Commons
2.
19 p, 5.0 MB (Plio-)Pleistocene alluvial-lacustrine basin infill evolution in a strike-slip active zone (Northern Andes, Western-Central Cordilleras, Colombia) / Suter, Fiore (University of Geneva.Department of Geology-Paleontology) ; Neuwerth, Ralph (University of Geneva.Department of Geology-Paleontology) ; Gorin, Georges (University of Geneva.Department of Geology-Paleontology) ; Guzmán, Carlos (University of Caldas. Department of Geological Sciences)
The (Plio)-Pleistocene Zarzal Formation was deposited in the Cauca Depression and Quindío-Risaralda Basin between the Western and Central Cordilleras (Northern Andes). This area is structurally located on the transcurrent Romeral Fault System (RFS). [...]
2008 - 10.1344/105.000000253
Geologica acta, Vol. 6, Núm. 3 (Setembre 2008) , p. 231-249  
Detailed record - Creative Commons
3.
8 p, 858.2 KB The southernmost evidence for an interglacial transgression (Sangamon?) in South America. First record of upraised Pleistocene marine deposits in Isla Navarino (Beagle Channel, Southern Chile) / Rabassa, Jorge (Universidad Nacional de la Patagonia San Juan Bosco) ; Gordillo, Sandra (Universidad Nacional de Córdoba) ; Ocampo, Carlos (Ciprés Consultores Ltda. and Fundación Wulaia) ; Rivas Hurtado, Pilar (Ciprés Consultores Ltda. and Fundación Wulaia) ; Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina)
Marine beach shell deposits recording a pre-Holocene marine transgression have been found at the southern shore of the Beagle Channel, Isla Navarino, Chile. These shelly deposits were dated by AMS at 41,700 14C years B. [...]
2008 - 10.1344/105.000000254
Geologica acta, Vol. 6, Núm. 3 (Setembre 2008) , p. 251-258  
Detailed record - Creative Commons
4.
8 p, 543.7 KB Detrital pyroxenes in the Eocene flysch of the Istrian Basin (Slovenia, Croatia) / Lenaz, Davide (Università degli Studi di Trieste)
For the first time, few detrital augite and pigeonite crystals have been found in the Eocene flysch basins of Istria (Trieste-Koper basin; Italy, Slovenia, Croatia) and Krk Island (Croatia). Their chemistry suggests that they are related to subalkaline rocks (within-plate tholeiites) crystallized at a pressure between 0 and 5 kbar. [...]
2008 - 10.1344/105.000000255
Geologica acta, Vol. 6, Núm. 3 (Setembre 2008) , p. 259-266  
Detailed record - Creative Commons
5.
17 p, 1.6 MB Dating the Triassic continental rift in the southern Andes : the Potrerillos Formation, Cuyo Basin, Argentina / Spalletti, Luis A. (Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo) ; Fanning, Mark (The Australian National University. Research School of Earth Sciences) ; Washington Rapela, Carlos (Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo) ; Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina). Centro de Investigaciones Geológicas
The Triassic successions of western Argentina commonly show thin pyroclastic levels intercalated within thick fluvial and lacustrine terrigenous deposits. The Potrerillos Formation is the thickest Triassic unit in the Cuyo Basin. [...]
2008 - 10.1344/105.000000256
Geologica acta, Vol. 6, Núm. 3 (Setembre 2008) , p. 267-283  
Detailed record - Creative Commons
6.
7 p, 851.5 KB A new chironomid (Insecta : Diptera) from Wealden amber (Lower Cretaceous) of the Isle of Wight (UK) / Jarzembowski, Ed (Maidstone Museum and Bentlif Art Gallery, St Faith's St, Maidstone) ; Azar, Dany (Lebanese University. Department of Biology, Fanar Matn) ; Nel, André (Muséum National d'Histoire Naturelle)
The first insect from the Wealden amber of the Isle of Wight (early Barremian) is formally described. Dungeyella gavini n. gen. , n. sp. (Diptera: Chironomidae) is a tiny buchonomyiine/podonomian with specialised wing venation and probably lived in an araucarian riparian woodland with seasonal resin production. [...]
2008 - 10.1344/105.000000257
Geologica acta, Vol. 6, Núm. 3 (Setembre 2008) , p. 285-291  
Detailed record - Creative Commons

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