Artículo

Alexandre, F.M.; Sommer, C.A.; De Lima, E.F.; Chemale Jr., F.; Marsicano, C.A.; Mancuso, A.C.; Brod, J.A. "Petrology of the Cerro Morado basic magmatism in the Ischigualasto-Villa Unión triassic basin (NW Argentine) " (2010) Pesquisas em Geociencias. 36(3):295-313
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Abstract:

Studies carried out in Cerro Morado, situated in the Ischigualasto - Vale de la Luna Provincial Park (northernmost San Juan Province - Argentina), have allowed the identification and characterization of silica undersaturated hypabyssal alkaline basic rocks. This magmatism is probably related to an extensional reactivation of Paleozoic lineaments due to the breakup of the Gondwana supercontinent. The Cerro Morado hypabyssal rocks occur as a conformable body intrusive in sedimentary rocks of the Chãares Formation (Middle Triassic) of the Ischigualasto - Villa Unión Triassic Basin. The basal portion of the sill is formed by olivinebearing, dominantly porphyritic diabase, where plagioclase, clinopyroxene, and rare olivine phenocrysts are set in a hypocrystalline, fine-grained matrix of the same composition, plus opaque minerals, apatite and glass. Trachytic, intergranular and ophitic textures are also common. The intermediate and upper portions comprise mainly porphyritic tephrytic rocks, with plagioclase, feldspathoid, and clino-pyroxene phenocrysts set in a fine-grained matrix of the same composition. Chemical classifica-tions of the Cerro Morado rocks must be applied with care, due to their high L.O.I values. The behavior of major and trace elements suggests that mineral fractionation was the main magmatic differentiation process. The LILE, HFSE and REE contents are very similar to those of intra-plate alkaline basalts. The high LILE and HFSE contents, associated to incompatible element-ratios suggest a heterogeneous and enriched mantle source. The enrichment in Sr, K, Rb, and Ba may result from modification of a mantle source by aqueous fluids driven off the subducted oceanic crust. Rb-Sr and Sm-Nd preliminary data suggest mantle sources, including a HIMU isotopic reservoir, and minor influence of an enriched-mantle component.

Registro:

Documento: Artículo
Título:Petrology of the Cerro Morado basic magmatism in the Ischigualasto-Villa Unión triassic basin (NW Argentine)
Autor:Alexandre, F.M.; Sommer, C.A.; De Lima, E.F.; Chemale Jr., F.; Marsicano, C.A.; Mancuso, A.C.; Brod, J.A.
Filiación:Programa de Pós-graduação em Geociências, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500 - Prédio 43126, Sala 102b - CEP: 91540-000, Porto Alegre, RS, Brazil
Instituto de Geociências/Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500 - Prédio 43126, Sala 102b - CEP: 91540-000, Porto Alegre, RS, Brazil
Centro de Ciências Biológicas e da Saúde-Núcleo de Geologia, Universidade Federal de Sergipe, Av. Marechal Rondon, s/n - CEP: 49100-000, São Cristóvão, SE, Brazil
Facultad de Ciencias Exactas y Naturales/Universidad de Buenos Aires, Pabellón II- Ciudad Universitária CP (1428), Ciudad Autónoma de Buenos Aires, Brazil
Instituto de Estudos Sócio-Ambientais/Universidade Federal de Goiás, Campus Samambaia - CEP: 74001-970, Goiânia, GO, Brazil
Palabras clave:NW Argentine; Petrology; Sill; Undersaturated rocks
Año:2010
Volumen:36
Número:3
Página de inicio:295
Página de fin:313
Título revista:Pesquisas em Geociencias
Título revista abreviado:Pesqui. Geociencias
ISSN:15182398
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15182398_v36_n3_p295_Alexandre

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Citas:

---------- APA ----------
Alexandre, F.M., Sommer, C.A., De Lima, E.F., Chemale Jr., F., Marsicano, C.A., Mancuso, A.C. & Brod, J.A. (2010) . Petrology of the Cerro Morado basic magmatism in the Ischigualasto-Villa Unión triassic basin (NW Argentine) . Pesquisas em Geociencias, 36(3), 295-313.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15182398_v36_n3_p295_Alexandre [ ]
---------- CHICAGO ----------
Alexandre, F.M., Sommer, C.A., De Lima, E.F., Chemale Jr., F., Marsicano, C.A., Mancuso, A.C., et al. "Petrology of the Cerro Morado basic magmatism in the Ischigualasto-Villa Unión triassic basin (NW Argentine) " . Pesquisas em Geociencias 36, no. 3 (2010) : 295-313.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15182398_v36_n3_p295_Alexandre [ ]
---------- MLA ----------
Alexandre, F.M., Sommer, C.A., De Lima, E.F., Chemale Jr., F., Marsicano, C.A., Mancuso, A.C., et al. "Petrology of the Cerro Morado basic magmatism in the Ischigualasto-Villa Unión triassic basin (NW Argentine) " . Pesquisas em Geociencias, vol. 36, no. 3, 2010, pp. 295-313.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15182398_v36_n3_p295_Alexandre [ ]
---------- VANCOUVER ----------
Alexandre, F.M., Sommer, C.A., De Lima, E.F., Chemale Jr., F., Marsicano, C.A., Mancuso, A.C., et al. Petrology of the Cerro Morado basic magmatism in the Ischigualasto-Villa Unión triassic basin (NW Argentine) . Pesqui. Geociencias. 2010;36(3):295-313.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15182398_v36_n3_p295_Alexandre [ ]