Geologica acta

Geologica acta Encontrados 16 registros  La búsqueda tardó 0.01 segundos. 
1.
8 p, 362.9 KB Subduction Zones of the Caribbean : the sedimentary, magmatic, metamorphic and ore-deposit records UNESCO/iugs igcp Project 546 Subduction Zones of the Caribbean / García-Casco, A. (Universidad de Granada. Departamento de Mineralogía y Petrología) ; Proenza, J.A. (Universitat de Barcelona. Departament de Cristal·lografia, Mineralogia i Dipòsits Minerals) ; Iturralde-Vinent, M.A. (Museo Nacional de Historia Natural)
2011 - 10.1344/105.000001745
Geologica acta, Vol. 9, Núm. 3-4 (setembre-desembre 2011) , p. 217-224  
2.
3 p, 141.8 KB Memorial to Wayne T. Jolly 1940-2008 / Lidiak, Edward G. (University of Pittsburgh)
2011 - 10.1344/105.000001712
Geologica acta, Vol. 9, Núm. 3-4 (setembre-desembre 2011) , p. 225-227  
3.
36 p, 1.3 MB The metallogenic evolution of the Greater Antilles / Nelson, C.E. (Consulting Geologist) ; Proenza, J.A. (Universitat de Barcelona. Departament de Cristal.lografia, Mineralogia i Dipòsits Minerals) ; Lewis, J.F. (The George Washington University. Department of Earth and Environmental Sciences) ; López-Kramer, J. (Instituto de Geofísica y Astronomía AMA-CITMA. Departamento de Geología Ambiental, Geofísica y Riesgos)
The Greater Antilles host some of the world's most important deposits of bauxite and lateritic nickel as well as significant resources of gold and silver, copper, zinc, manganese, cobalt and chromium. [...]
2011 - 10.1344/105.000001741
Geologica acta, Vol. 9, Núm. 3-4 (setembre-desembre 2011) , p. 229-264  
4.
22 p, 760.5 KB U-Pb Geochronology of detrital zircons from the Venezuelan passive margin : implications for an Early Cretaceous Proto-Orinoco river system and Proto-Caribbean ocean basin paleogeography / Noguera, M.I. (Swift Energy Operating) ; Wright, J.E. (University of Georgia. Department of Geology) ; Urbani, F. (Universidad Central de Venezuela) ; Pindell, J. (Rice University Keith-Weiss Geological Laboratory. Department of Earth Science)
The Guyana Shield has long been interpreted as the source of siliciclastic detritus within the Cretaceous passive margin strata of northern Venezuela. We have determined U-Pb ages of detrital zircons separated from Early Cretaceous strata of the passive margin. [...]
2011 - 10.1344/105.000001698
Geologica acta, Vol. 9, Núm. 3-4 (setembre-desembre 2011) , p. 265-272  
5.
29 p, 1.3 MB Pre-arc basement complex and overlying early island arc strata, Southwestern Puerto Rico : overview, geologic evolution, and revised data bases / Lidiak, E.G. (University of Pittsburgh. Department of Geology and Planetary Science) ; Jolly, W.T. (Brock University. Department of Earth Sciences) ; Dickin, A.P. (McMaster University. Department of Geography and Geology)
The pre-arc basement complex in southwestern Puerto Rico consists of rocks exposed in the Bermeja complex. The oldest rocks are highly serpentinized peridotites that occur in three belts (Monte del Estado, Río Guanajibo, and Sierra Bermeja). [...]
2011 - 10.1344/105.000001715
Geologica acta, Vol. 9, Núm. 3-4 (setembre-desembre 2011) , p. 273-287  
6.
18 p, 1.5 MB Petrogenesis of fertile mantle peridotites from the Monte del Estado massif (Southwest Puerto Rico): a preserved section of Proto-Caribbean lithospheric mantle? / Marchesi, C. (Géosciences Montpellier) ; Jolly, W.T. (Brock University. Department of Earth Sciences) ; Lewis, J.F. (The George Washington University. Department of Earth and Environmental Sciences) ; Garrido, C.J. (CSIC-Universidad de Granada. Instituto Andaluz de Ciencias de la Tierra) ; Proenza, J.A. (Universitat de Barcelona. Departament de Cristal·lografia, Mineralogia i Dipòsits Minerals) ; Lidiak, E.G. (University of Pittsburgh. Department of Geology and Planetary Science)
The Monte del Estado massif is the largest and northernmost serpentinized peridotite belt in southwest Puerto Rico. It is mainly composed of spinel lherzolite and minor harzburgite with variable clinopyroxene modal abundances. [...]
2011 - 10.1344/105.000001713
Geologica acta, Vol. 9, Núm. 3-4 (setembre-desembre 2011) , p. 289-306  
7.
26 p, 1.5 MB The Pelona-Pico Duarte basalts Formation, Central Hispaniola : an on-land section of Late Cretaceous volcanism related to the Caribbean large igneous province / Escuder-Viruete, Joaquín (Instituto Geológico y Minero de España) ; Pérez-Estaún, Andrés (Centro Superior de Investigaciones Científicas. Institut de Ciències de la Terra Jaume Almera) ; Joubert, M. (Bureau de Recherches Géologiques et Minières (Orleans, França)) ; Weis, D. (University of British Columbia. Pacific Centre for Isotopic and Geochemical Research)
Located in Central Hispaniola, the Pelona-Pico Duarte basalts Formation (Fm. ) offers an opportunity to study the Late Cretaceous Caribbean large igneous province magmatism on land. It is composed by a ~2. [...]
2011 - 10.1344/105.000001716
Geologica acta, Vol. 9, Núm. 3-4 (setembre-desembre 2011) , p. 307-328  
8.
36 p, 1.6 MB The Chuacús Metamorphic Complex, central Guatemala : geochronological and geochemical constraints on its Paleozoic - Mesozoic evolution / Solari, L.A. (Universidad Nacional Autónoma de México. Centro de Geociencias) ; Gómez-Tuena, A. (Universidad Nacional Autónoma de México. Centro de Geociencias) ; Ortega-Gutiérrez, F. (Universidad Nacional Autónoma de México. Instituto de Geología) ; Ortega-Obregón, C. (Universidad Nacional Autónoma de México. Instituto de Geología)
The Chuacús Metamorphic Complex is located in Central Guatemala, between the Polochic and Motagua fault zones. It is made up of complexly intercalated, mafic and felsic high-grade gneisses, amphibolites, pelitic and quartzofeldsphatic metasediments and subordinate marbles. [...]
2011 - 10.1344/105.000001695
Geologica acta, Vol. 9, Núm. 3-4 (setembre-desembre 2011) , p. 329-350  
9.
12 p, 1.8 MB 40Ar/39Ar ages from blueschists of the Jambaló region, Central Cordillera of Colombia : implications on the styles of accretion in the Northern Andes / Bustamante, A. (Universidade de São Paulo. Instituto de Geociências) ; Juliani, C. (Universidade de São Paulo. Instituto de Geociências) ; Hall, C.M. (University of Michigan. Department of Geological Sciences) ; Essene, E.J. (University of Michigan. Department of Geological Sciences)
This paper presents the first argon dating of blueschists from the Jambaló area (Cauca Department) in the Central Cordillera of the Colombian Andes. Step-heating 40Ar/39Ar spectra were obtained for mica from several lenses of blueschists including greenschist facies rocks. [...]
2011 - 10.1344/105.000001697
Geologica acta, Vol. 9, Núm. 3-4 (setembre-desembre 2011) , p. 351-362  
10.
30 p, 1.8 MB Jadeitite from Guatemala : new observations and distinctions among multiple occurrences / Harlow, G.E. (American Museum of Natural History. Department of Earth and Planetary Sciences) ; Sisson, V. B. (University of Houston. Department of Earth and Atmospheric Sciences) ; Sorensen, S.S. (Smithsonian Institution. Department of Mineral Sciences)
In Guatemala, jadeitite occurs as blocks in serpentinite mélange in distinct settings on opposite sides of the Motagua fault. Jadeitites north of the Motagua fault are associated with eclogites, blueschists, and garnet amphibolites and distributed over a 200km E-W area. [...]
2011 - 10.1344/105.000001694
Geologica acta, Vol. 9, Núm. 3-4 (setembre-desembre 2011) , p. 363-387  
11.
17 p, 6.8 MB Serpentinites and serpentinites within a fossil subduction channel : La Corea mélange, eastern Cuba / Blanco-Quintero, I.F. (Universidad de Granada. Departamento de Mineralogía y Petrología) ; Proenza, J.A. (Universitat de Barcelona. Departament de Cristal·lografia, Mineralogia i Dipòsits Minerals) ; García-Casco, A. ((CSIC-UGR). Instituto Andaluz de Ciencias de la Tierra) ; Tauler, E. (Universitat de Barcelona. Departament de Cristal·lografia, Mineralogia i Dipòsits Minerals) ; Galí, S. (Universitat de Barcelona. Departament de Cristal·lografia, Mineralogia i Dipòsits Minerals)
A variety of metaultramafic (serpentinite) rocks in La Corea mélange, Sierra de Cristal, eastern Cuba, show differences in chemical, textural and mineralogical characteristics demonstrating a variety of protoliths. [...]
2011 - 10.1344/105.000001662
Geologica acta, Vol. 9, Núm. 3-4 (setembre-desembre 2011) , p. 389-405  
12.
17 p, 934.3 KB Chromite and platinum group elements mineralization in the Santa Elena Ultramafic Nappe (Costa Rica): geodynamic implications / Zaccarini, F. (University of Leoben. Department of Applied Geosciences and Geophysics) ; Garuti, G. (University of Leoben. Department of Applied Geosciences and Geophysics) ; Proenza, J.A. (Universitat de Barcelona. Departament de Cristal·lografia, Mineralogia i Dipòsits Minerals) ; Campos, L. (University of Costa Rica. Escuela Centroamericana de Geología) ; Thalhammer, O.A.R. (University of Leoben. Department of Applied Geosciences and Geophysics) ; Aiglsperger, T. (Universitat de Barcelona. Departament de Cristal·lografia, Mineralogia i Dipòsits Minerals) ; Lewis, J.F. (The George Washington University. Department of Earth and Environmental Sciences)
Chromitites associated with strongly altered peridotite from six distinct localities in the Santa Elena ultramafic nappe (Costa Rica) have been investigated for the first time. Santa Elena chromitites commonly display a compositional variation from extremely chromiferous (Cr/(Cr+Al)=0. [...]
2011 - 10.1344/105.000001696
Geologica acta, Vol. 9, Núm. 3-4 (setembre-desembre 2011) , p. 407-423  
13.
20 p, 4.4 MB Geochemistry and Geochronology of the Guajira Eclogites, northern Colombia : evidence of a metamorphosed primitive Cretaceous Caribbean Island-arc / Weber, M. (Universidad Nacional de Colombia) ; Cardona, A. (Smithsonian Tropical Research Institute) ; Valencia, V. (The University of Arizona. Department of Geosciences) ; Altenberger, U. (Potsdam Universität) ; López-Martínez, M. (Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE). Departamento de Geología) ; Tobón, M. (Universidad Nacional de Colombia) ; Zapata, S. (Universidad Nacional de Colombia) ; Zapata, G. (Universidad Nacional de Colombia) ; Concha, A.E. (Universidad Nacional de Colombia)
The chemical composition of eclogites, found as boulders in a Tertiary conglomerate from the Guajira Peninsula, Colombia suggests that these rocks are mainly metamorphosed basaltic andesites. They are depleted in LILE elements compared to MORB, have a negative Nb-anomaly and flat to enriched REE patterns, suggesting that their protoliths evolved in a subduction related tectonic setting. [...]
2011 - 10.1344/105.000001740
Geologica acta, Vol. 9, Núm. 3-4 (setembre-desembre 2011) , p. 425-443  
14.
25 p, 887.3 KB Transient Cenozoic tectonic stages in the southern margin of the Caribbean plate : U-Th/He thermochronological constraints from Eocene plutonic rocks in the Santa Marta massif and Serranía de Jarara, northern Colombia / Cardona, A. (Smithsonian Tropical Research Institute) ; Valencia, V. (Washington State University. Earth and Environmental Science Department) ; Weber, M. (Universidad Nacional de Colombia. Sede de Medellín. Escuela de Geociencias y Medio Ambiente) ; Duque, J. (Universidad Autónoma de México. Centro de Geociencias) ; Montes, C. (Corporación Geológica Ares) ; Ojeda, G. (Instituto Colombiano del Petróleo-Ecopetrol) ; Reiners, P. (University of Arizona. Department of Geosciences) ; Domanik, K. (University of Arizona. Department of Planetary Sciences) ; Nicolescu, S. (University of Arizona. Department of Geosciences) ; Villagomez, D. (University of Geneva. Department of Earth Sciences)
We use U-Th/(He) zircon and apatite thermochronology and Al in hornblende geobarometry from Eocene granitoids of the Sierra Nevada de Santa Marta and Guajira uplifted massifs in northern Colombia to elucidate the exhumation history of the northern South America continental margin and its bearing to Cenozoic Caribbean– South American plate interactions. [...]
2011 - 10.1344/105.000001739
Geologica acta, Vol. 9, Núm. 3-4 (setembre-desembre 2011) , p. 445-466  
15.
13 p, 984.9 KB Geochemistry and petrology of three granitoid rock cores from the Nicaraguan Rise, Caribbean Sea : implications for its composition, structure and tectonic evolution / Lewis, J.F. (The George Washington University. Department of Earth and Environmental Science) ; Kysar Mattietti, G. (The George Mason University. Atmospheric, Oceanic and Earth Science Department) ; Perfit, M. (University of Florida. Department of Geological Sciences) ; Kamenov, G. (University of Florida. Department of Geological Sciences)
The Nicaraguan Rise is a major submarine structure of poorly known origin. Its lithologies have been studied from dredge hauls and land outcrops on the Greater Antilles and Central America and its structure from geophysical data. [...]
2011 - 10.1344/105.000001714
Geologica acta, Vol. 9, Núm. 3-4 (setembre-desembre 2011) , p. 467-469  
16.
18 p, 845.7 KB Geology of the Cerro Quema Au-Cu deposit (Azuero Peninsula, Panama) / Corral, Isaac (Universitat Autònoma de Barcelona. Departament de Geologia) ; Gómez-Gras, David (Universitat Autònoma de Barcelona. Departament de Geologia) ; Griera i Artigas, Albert (Universitat Autònoma de Barcelona. Departament de Geologia) ; Corbella i Cordomí, Mercè (Universitat Autònoma de Barcelona. Departament de Geologia) ; Canals i Sabaté, Àngels (Universitat de Barcelona. Facultat de Geologia) ; Pineda-Falconett, M. (Universidad de Panamá. Departamento de Geografía) ; Cardellach López, Esteve (Universitat Autònoma de Barcelona. Departament de Geologia)
The Cerro Quema district, located on the Azuero Peninsula, Panama, is part of a large regional hydrothermal system controlled by regional faults striking broadly E-W, developed within the Río Quema Formation. [...]
2011 - 10.1344/105.000001742
Geologica acta, Vol. 9, Núm. 3-4 (setembre-desembre 2011) , p. 481-498  

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