Geologica acta

Geologica acta 4 records found  Search took 0.01 seconds. 
1.
39 p, 2.0 MB The Four Phases of Plant-Arthropod Associations in Deep Time / Labandeira, Conrad C. (Smithsonian Institution. National Museum of Natural History) ; University of Maryland. Department of Entomology
Vascular-plant hosts, their arthropod herbivores, and associated functional feeding groups are distributed spatiotemporally into four major herbivore expansions during the past 420 m. y. They are: (1) a Late Silurian to Late Devonian (60 m. [...]
2006 - 10.1344/105.000000344
Geologica acta, Vol. 4, Núm. 4 (2006) , p. 409-438  
2.
11 p, 523.0 KB Element behaviour during combustion in coal-fired Orhaneli power plant, Bursa-Turkey / Esenlik, S. (Hacettepe University. Department of Geological Engineering) ; Alastuey, Andrés (Centro Superior de Investigaciones Científicas. Institute of Earth Sciences “Jaume Almera”) ; Karayigit, A. I. (Hacettepe University. Department of Geological Engineering) ; Bulut, Y. (Hacettepe University. Department of Geological Engineering) ; Querol Carceller, Xavier (Centro Superior de Investigaciones Científicas. Institute of Earth Sciences “Jaume Almera”) ; Font, O. (Centro Superior de Investigaciones Científicas. Institute of Earth Sciences “Jaume Almera”)
This study focuses on element behaviour during combustion in the Orhaneli thermal power plant (a 210 MW unit, Bursa-Turkey). A total of 51 samples, feed coals (FCs), fly ashes (FAs) and bottom ashes (BAs), which were systematically collected over an eight-week period, have been analysed for major, minor and trace elements (Al, Ca, Fe, K, Mg, Na, S, As, B, Ba, Be, Bi, Cd, Co, Cr, Cs, Cu, Ga, Ge, Hf, Hg, Li, Mn, Mo, Nb, Ni, P, Pb, Rb, Sb, Sc, Se, Sn, Sr, Ta, Th, Ti, Tl, U, V, W, Y, Zn, Zr and REEs). [...]
2006 - 10.1344/105.000000345
Geologica acta, Vol. 4, Núm. 4 (2006) , p. 439-449  
3.
10 p, 1.1 MB A precise late Permian 40Ar/ 39Ar age for Central Iberian camptonitic lamprophyres / Scarrow, J. H. (Universidad de Granada. Departamento de Mineralogía y Petrología) ; Bea, F. (Universidad de Granada. Departamento de Mineralogía y Petrología) ; Montero, P. (Universidad de Granada. Departamento de Mineralogía y Petrología) ; Molina Palma, José Francisco (Universidad de Granada. Departamento de Mineralogía y Petrología) ; Vaughan, A. P. M. (British Antarctic Survey)
The Avila batholith of central Spain is composed, predominantly, of crustal-melt peraluminous granites cut by small-scale mafic alkaline bodies. Dating of the Gredos sector mafic camptonitic lamprophyre dykes was undertaken to constrain the Late Variscan tectonomagmatic evolution of the region. [...]
2006 - 10.1344/105.000000346
Geologica acta, Vol. 4, Núm. 4 (2006) , p. 451-459  
4.
9 p, 287.1 KB Exotic accessory minerals in layered chromitites of the Campo Formoso complex (Brazil) / Zaccarini, F. (University of Leoben. Department of Applied Geological Sciences and Geophysics) ; Garuti, G. (University of Modena and Reggio Emilia. Dipartimento di Scienze della Terra) ; Martin, R. F. (McGill University. Department of Earth and Planetary Sciences) ; Instituto Andaluz de Ciencias de la Tierra
The Campo Formoso stratiform intrusive complex, in Bahia State, Brazil, considered to be of Paleoproterozoic age, consists of a tabular body of ultramafic rocks about 40 km long and 100-1100 m wide. Thick horizons of chromitite are exploited and the deposits are the richest in Brazil. [...]
2006 - 10.1344/105.000000347
Geologica acta, Vol. 4, Núm. 4 (2006) , p. 461-469  

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