Paleogene and Neogene magmatism in the Valle del Cura region: New perspective on the evolution of the Pampean flat slab, San Juan province, Argentina
The Valle del Cura region is characterized by a thick volcanic and volcaniclastic sequence that records the Tertiary arc and backarc magmatic evolution of the Argentine Main Cordillera over the modern Pampean flatslab at 29.5-30°S. During the Eocene, a retroarc basin developed, represented by the Va...
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2007
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| LEADER | 19380caa a22011897a 4500 | ||
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| 001 | PAPER-6429 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518203607.0 | ||
| 008 | 190411s2007 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-34548397089 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 100 | 1 | |a Litvak, V.D. | |
| 245 | 1 | 0 | |a Paleogene and Neogene magmatism in the Valle del Cura region: New perspective on the evolution of the Pampean flat slab, San Juan province, Argentina |
| 260 | |c 2007 | ||
| 270 | 1 | 0 | |m Litvak, V.D.; Consejo Nacional de Investigaciones Científicas y Técnicas, Departamento de Ciencias Geológicas-Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria Pabellon II-, C1428EHA, Argentina; email: vane@gl.fcen.uba.ar |
| 506 | |2 openaire |e Política editorial | ||
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| 504 | |a Bissig, T., Clark, A.H., Lee, J.K.W., von Quadt, A., Petrogenetic and metallogenetic responses to Miocene slab flattenig: new constrains from the El Indio-Pascua Au-Ag-Cu Belt, Chile/Argentina (2003) Mineralium Deposita, 38, pp. 844-862 | ||
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| 504 | |a Kay, S.M., Godoy, E., Kurtz, A., Episodic arc migration, crustal thickening, subduction erosion and magmatism in the South-Central Andes (2005) Geology Society of American Bulletin, 117, pp. 67-88 | ||
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| 504 | |a Kay, S.M., Maksaev, V.A., Moscoso, R., Mpodozis, C., Nasi, C., Probing the evolving Andean lithosphere: Mid-late Tertiary Magmatism in Chile (29°-30°30′S) over the modern zone of subhorizontal subduction (1987) Journal of Geophysical Research, 92, pp. 6173-6189 | ||
| 504 | |a Kay, S.M., Maksaev, V.A., Moscoso, R., Mpodozis, C., Nasi, C., Gordillo, C.E., Tertiary Andean Magmatism in Chile and Argentina between 28°S and 33°S: Correlation of magmatic chemistry with changing Benioff zone (1988) Journal South American Geology Earth Sciences, 1, pp. 21-38 | ||
| 504 | |a Kurtz, A., Kay, S.M., Charrier, R., Farrar, E., Geochronology of Miocene plutons and exhumation history of the El Teniente region, Central Chile (34-35° L.S.) (1997) Revista Geológica de Chile, 24, pp. 75-90 | ||
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| 504 | |a Limarino, C.O., Fauqué, L.A., Cardó, R., Gagliardo, M.L., Escosteguy, L., La Faja volcánica miocena de la Precordillera septentrional. Revista de la Asociación Geológica Argentina (2002) Revista de la Asociación Geológica Argentina, 57, pp. 289-304 | ||
| 504 | |a Limarino, C.O., Gutiérrez, P.R., Malizia, D., Barreda, V., Page, S., Ostera, H., Linares, E., Edad de las secuencias paleógenas y neógenas de las cordilleras de la Brea y Zancarrón, Valle del Cura, San Juan (1999) Revista de la Asociación Geológica Argentina, 54, pp. 177-181 | ||
| 504 | |a Litvak, V.D., Page, S., Nueva evidencia cronológica en el Valle del Cura, provincia de San Juan (2002) Revista de la Asociación Geológica Argentina, 57, pp. 483-486 | ||
| 504 | |a Litvak, V.D., Poma, S., Estratigrafía y facies volcánicas y volcaniclásticas de la Formación Valle del Cura: magmatismo paleógeno en la Cordillera Frontal de San Juan (2005) Revista de la Asociación Geológica Argentina, 60 (2), pp. 402-416 | ||
| 504 | |a Litvak, V.D., Chernicoff, C.J., Poma, S., Localización de centros eruptivos mediante aeromagnetometría en el sector central del Valle del Cura, San Juan, Argentina: implicancias para la evolución de arco/retroarco Cenozoico (2005) Revista Geológica de Chile, 32, pp. 77-93 | ||
| 504 | |a Litvak, V.D., Kay, S.M., Mpodozis, C., New K/Ar ages on Tertiay volcanic rocks in the Valle del Cura, Pampean flat slab segment, Argentina (2005) Actas XVI Congreso Geológico Argentino, (2), pp. 159-164 | ||
| 504 | |a Litvak, V.D., Poma, S., Limarino, C.O., Volcanismo piroclástico de edad eocena media en el Valle del Cura, provincia de San Juan: nuevos datos geológicos y geocronológicos (2004) Revista de la Asociación Geológica Argentina, 59, pp. 514-517 | ||
| 504 | |a Maksaev, V., Moscoso, R., Mpodozis, C., Nasi, C., Las unidades volcánicas y plutónicas del Cenozoico superior entre la Alta Cordillera del Norte Chico (29°-31 °S), Geología, alteración hidrotermal y mineralización (1984) Revista Geológica de Chile, 21, pp. 11-51 | ||
| 504 | |a Martin, M.W., Clavero, J.R., Mpodozis, C.M., Late Paleozoic to Early Jurassic tectonic development of the high Andean Principal Cordillera, El Indio Region, Chile (29°-30°S) (1999) Journal of South American Earth Sciences, 12, pp. 33-49 | ||
| 504 | |a Pardo Casas, F., Molnar, P., Relative motion of the Nazca (Farallón) and South America plates since Late Cretaceous time (1987) Tectonics, 6, pp. 233-248 | ||
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| 504 | |a Pilger, R.H., Cenozoic plate kinematics, subduction and magmatism: South American Andes (1984) Journal of the Geological Society of London, 141, pp. 793-802 | ||
| 504 | |a Ramos, V.R., Kay, S.M., Singer, B.S., Las adakitas de la Cordillera Patagónica: nuevas evidencias geoquímicas y geocronológicas (2004) Revista de la Asociación Geológica Argentina, 59 (4), pp. 693-706 | ||
| 504 | |a Ramos, V.A., Kay, S.M., Page, R., Munizaga, F., La Ignimbrita Vacas Heladas y el cese del volcanismo en el Valle del Cura, provincia de San Juan (1989) Revista de la Asociación Geológica Argentina, 44, pp. 336-352 | ||
| 504 | |a Ramos, V.A., Page, R., Kay, S.M., Lapido, O., Delpino, D., Geología de la región del volcán Tórtolas, Valle del Cura, provincia de San Juan. Actas 10° Congreso Geológico Argentino y Simposium Circumpacific Phanerozoic Granites (1987) Tucumán, 4, pp. 260-263 | ||
| 504 | |a Richards, J.P., Discussion on "Giant versus small porphyry copper deposits of Cenozopic age in northern Chile: Adakitic versus normal calc-alkaline magmatism" by Oyarzun et al (2002) Mineralium Deposita, 37, pp. 788-790 | ||
| 504 | |a Rollinson, H.R., (1993) Using Geochemical Data: Evaluation, presentation, interpretation, , Longman Scientific & Technical, Longman Group UK Ltd p. 352 | ||
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| 504 | |a Vergés, J., Ramos, E., Seward, D., Busquets, P., Colombo, F., Miocene sedimentary and tectonic evolution of the Andean Precordillera at 31°S, Argentina (2001) Journal of South American Earth Sciences, 14 (7), pp. 735-750 | ||
| 504 | |a Yañez, G.A., Ranero, C.R., von Huene, R., Díaz, J., Magnetic anomaly interpretation across the southern central Andes (32-34°): the role of the Juan Fernández Ridge in the late Tertiary evolution of the margin (2001) Journal of Geophysical Research, 106, pp. 6325-6345 | ||
| 520 | 3 | |a The Valle del Cura region is characterized by a thick volcanic and volcaniclastic sequence that records the Tertiary arc and backarc magmatic evolution of the Argentine Main Cordillera over the modern Pampean flatslab at 29.5-30°S. During the Eocene, a retroarc basin developed, represented by the Valle del Cura Formation synorogenic volcanosedimentary sequence, which includes rhyolites and dacitic tuffs. These silicic volcanic rocks have weak arc chemical signatures and high lithophile element concentrations and are isotopically enriched relative to the late Oligocene-early Miocene volcanic rocks that followed them. Their chemical characteristics fit with eruption through a thin crust. The Valle de Cura Formation was followed by the Oligocene-early Miocene Doña Ana Group volcanic sequence, which erupted at and near the arc front west of the border with Chile. The Doña Ana Group volcanic rocks have calc-alkaline chemical characteristics consistent with parental magmas forming in a mantle wedge and erupting through a normal thickness crust (35 km). Subsequent shallowing of the downgoing Nazca plate caused the volcanic front to migrate eastward. The volcanic sequences of the middle Miocene Cerro de las Tórtolas Formation erupted at this new arc front, essentially at the Argentine border. Two stages are recognized: an older one (16-14 Ma) in which magmas appear to have erupted through a normal thickness crust (30-35 km) and a younger one (13-10 Ma) in which the steeper REE pattern suggests the magmas last equilibrated with higher pressure residual mineral assemblages in a thicker crust. Isotopic ratios in the younger group are consistent with an increase in original crustal components and crust introduced into the mantle source by forearc subduction erosion. A peak in forearc subduction erosion near 12-10 Ma is consistent with when the main part of the Juan Fernandez Ridge began to subduct beneath the region. In addition to late Miocene Tambo Formation dacitic ignimbrites, the younger Cerro de las Tórtolas Formation volcanic rocks erupted at the height of contractional deformation in the Valle del Cura and to the east. The last important volcanic sequence to erupt in the Valle del Cura is the late Miocene Vacas Heladas Ignimbrite, the most isotopically enriched Tertiary magmas in the Valle del Cura that contain the highest proportion of crustal components. Subsequently volcanism ceased in the region in response to shallowing of the subduction zone. © 2007 Elsevier Ltd. All rights reserved. |l eng | |
| 536 | |a Detalles de la financiación: Universidad de Buenos Aires, UBACYT X127 | ||
| 536 | |a Detalles de la financiación: Agencia Nacional de Promoción Científica y Tecnológica, PICT 25303 | ||
| 536 | |a Detalles de la financiación: This research was supported by grants from the University of Buenos Aires (UBACYT X127) and Agencia Nacional de Promoción Científica y Tecnológica (PICT 25303), with the support of the Servicio Geológico Minero Argentino (SEGEMAR). We thank Cornell University and the Cornell Center for Material Research for support in the making of the chemical analyses. The authors are particularly grateful to Dr. E. Godoy and Dr. I. Petrinovic for their reviews of the manuscript. Appendix A Major and most trace elements analyses were done at Cornell University. All samples were sawed into slabs, and fresh interior sections were chosen for whole-rock analysis. Slabs were broken into 0.25–0.5 cm size in a steel mortar; these pieces were pulverized in an aluminum oxide ceramic shatterbox. Major elements analyses were performed on a JEOL-733 Superprobe electron microprobe on glasses made from rock powders; Li kV accelerating voltage, 15 nA beam current, 40 s count time, and 30 mm beam. Data were reduced using the Bence-Albee program. Typical 2 wt%. Trace elements analyses were carried out by Instrumental Neutron Activation Analysis (INAA) at Cornell University and provided results for La, Ce, Nd, Sm, Eu, Tb, Yb, Lu, Sr, Ba, Cs, U, Th, Hf, Ta, Sc, Cr, Ni, and Co. These analyses were done on approximately 0.5 g of sample powder packed in ultrapure Suprasil kW for 3–4 h. Samples and standards were counted for 4–10 h on an Ortec GeLi detector after 6 and approximately 40 days following irradiation. The INAA precision (2s) based on replicate analysis of basalt PAL is ±2–7% for most elements and between ±8–16% for U, Sr, Nd, and Ni. The detail of used techniques and standards can be found in 2 B 4 O 7 was used as flux in silicic glasses. Analyses correspond to averages of 4–6 spots in WDS mode with a 15 σ precision is ±1–5% at >1 ® quartz tubing. The INAA runs consisted of 11 samples and three internal standards (PAL, WBD, and SIT) irradiated in the TRIGA reactor at Ward Laboratory (Cornell University) at a power level of approximately 400 Kay et al. (1987) . Some trace element analyses were done in Xral Laboratory (Canadá) by inductively coupled plasma mass spectroscopic (ICP-MS), according the standards and procedures of the laboratory. In these cases, Rb, Nb, Y, and Zr elements were also measured for the analyzed rocks. Sr and Nd isotopes were analyzed at Cornell University on a multicollector VG Sector 54 thermal ionization mass spectrometer. For lavas, approximately 250 mg of hand-picked sample chips (<50 mg per chip) were leached in hot 6 N HCl for 30 min and then dissolved in sealed 15 ml Savillex capsules with HF and HNO N and 6 N HCl as eluants. Nd was eluted using organically coated PFTE cation exchange resin and 0.16 N HCl. All ratios were measured by thermal ionization mass spectrometry. Sr and Nd ratios were corrected for mass fractionation assuming = 0.1194 and = 0.7219. The average measured value for the NBS987 Sr standard was = 0.710235 ± 34 (2 = 0.511864 ± 14 (2 ± 12 (2 = 0.512138 ± 20 (2 = −15.15 for the La Jolla standard. 3 acids. Sr and REE were separated using cation exchange columns with AG50W-x12 resin and 2.5 86 Sr/ 88 Sr 146 Nd/ 144 Nd 87 Sr/ 86 Sr σ ), based on 67 analyses. The La Jolla Nd standard was 143 Nd/ 144 Nd σ ) from July 1993 to August 1997, based on 10 analyses, and 0.511817 σ ) from August to November 1990, based on 15 analyses. The Ames Nd standard was 143 Nd/ 144 Nd σ ), based on 10 analyses. The &z.epsiv; Nd values calculated assume &z.epsiv; Nd | ||
| 593 | |a Consejo Nacional de Investigaciones Científicas y Técnicas, Departamento de Ciencias Geológicas-Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria Pabellon II-, C1428EHA, Argentina | ||
| 593 | |a Department of Earth and Atmospheric Sciences, INSTOC, Cornell University, Ithaca, NY 14853, United States | ||
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