INTRUSÃO ALCALINA DE MORRO PRETO (GO): GEOLOGIA, PETROGRAFIA E GEOQUÍMICA
作者： Guillermo Rafael Beltran Navarro , Fabiano Tomazini da Conceição , Antenor Zanardo , Nélson Angeli
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摘要: The alkaline intrusion of Morro Preto, located to the north Piranhas (GO), is an irregular subcircular rock body with about 3,34 km², hosted in gneisses Goias Magmatic Arc. It chiefly constituted by carbonatites and lamprophyres several degrees laterization silicification, as well silexites minor contents ferruginous syenites basalts. Chemically, it shows low concentrations Cs, K, Na, Rb high REE, Nb, Ba, Th U. This probably due processes laterization/silicification, new rare mineral phases formed, i.e., phosphates concentration REE Th, oxi-hydroxides Fe, Ba Mn, and/or siliceous Ta, among others, barite formation. Carbonatitic rocks P2O5 expressive enrichment suggests possible mineralization these components, similar other complexes (Catalao) Minas Gerais (Araxa). distribution minor, trace elements show that are alteration products alcaline igneous carbonatites, basalts, once naturally enriched U, (in special LREE), Nb Ta. excessively results from supergene hydrothermal temperature.
参考文章(10)
Stuart Ross Taylor, Scott M. McLennan, The continental crust: Its composition and evolution An examination of the geochemical record preserved in sedimentary rocks.. ,vol. 312, ,(1985)
José Affonso Brod, Geraldo Resende Boaventura, Hildor José Seer, Lúcia Castanheira De Moraes, Sally A. Gibson, Robert N. Thompson, Tereza Cristina Junqueira-Brod, THE KAMAFUGITE-CARBONATITE ASSOCIATION IN THE ALTO PARANAÍBA IGNEOUS PROVINCE (APIP) SOUTHEASTERN BRAZIL Brazilian Journal of Geology. ,vol. 30, pp. 408- 412 ,(2000) , 10.5327/RBG.V30I3.839
David A. Wood, The application of a ThHfTa diagram to problems of tectonomagmatic classification and to establishing the nature of crustal contamination of basaltic lavas of the British Tertiary Volcanic Province Earth and Planetary Science Letters. ,vol. 50, pp. 11- 30 ,(1980) , 10.1016/0012-821X(80)90116-8
J.A. Winchester, P.A. Floyd, Geochemical discrimination of different magma series and their differentiation products using immobile elements Chemical Geology. ,vol. 20, pp. 325- 343 ,(1977) , 10.1016/0009-2541(77)90057-2
T. N. IRVINE, A Guide to the Chemical Classification of the Common Volcanic Rocks Canadian Journal of Earth Sciences. ,vol. 8, pp. 523- 548 ,(1971) , 10.1139/E71-055
David A. Wood, Jean-Louis Joron, Michel Treuil, A RE-APPRAISAL OF THE USE OF TRACE ELEMENTS TO CLASSIFY AND DISCRIMINATE BETWEEN MAGMA SERIES ERUPTED IN DIFFERENT TECTONIC SETTINGS Earth and Planetary Science Letters. ,vol. 45, pp. 326- 336 ,(1979) , 10.1016/0012-821X(79)90133-X
H.H.G.J. Ulbrich, C.B. Gomes, Alkaline rocks from continental Brazil Earth-Science Reviews. ,vol. 17, pp. 135- 154 ,(1981) , 10.1016/0012-8252(81)90009-X
R. N. Thompson, S. A. Gibson, J. G. Mitchell, A. P. Dickin, O. H. Leonardos, J. A. Brod, J. C. Greenwood, Migrating Cretaceous–Eocene Magmatismin the Serra do Mar Alkaline Province,SE Brazil: Melts from the Deflected Trindade Mantle Plume? Journal of Petrology. ,vol. 39, pp. 1493- 1526 ,(1998) , 10.1093/PETROJ/39.8.1493
S. A. GIBSON, R. N. THOMPSON, O. H. LEONARDOS, A. P. DICKIN, J. G. MITCHELL, The Late Cretaceous Impact of the Trindade Mantle Plume: Evidence from Large-volume, Mafic, Potassic Magmatism in SE Brazil Journal of Petrology. ,vol. 36, pp. 189- 229 ,(1995) , 10.1093/PETROLOGY/36.1.189
Claudio Riccomini, Armando Márcio Coimbra, Geologia da bacia sedimentar Solos da Cidade de Sao Paulo. ,(1992)