Conodont palaeothermometry of contact metamorphism in Middle ordovician rocks from the precordillera of western Argentina
The Yerba Loca Formation (Middle-Upper Ordovician), exposed in the Western Precordillera, San Juan, Argentina, is made up of clastic-carbonate turbidites, and basic-ultrabasic rocks. It is affected by regional Siluro-Devonian very low-grade metamorphism that locally reaches greenschist facies. At An...
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2008
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| LEADER | 19136caa a22012017a 4500 | ||
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| 001 | PAPER-22366 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518205355.0 | ||
| 008 | 190411s2008 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-46749139514 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 100 | 1 | |a Voldman, G.G. | |
| 245 | 1 | 0 | |a Conodont palaeothermometry of contact metamorphism in Middle ordovician rocks from the precordillera of western Argentina |
| 260 | |c 2008 | ||
| 270 | 1 | 0 | |m Voldman, G.G.; CONICET and Museo de Paleontología, Universidad Nacional de Córdoba, P.O. Box 1598, X5000FCO Córdoba, Argentina; email: gvoldman@efn.uncor.edu |
| 506 | |2 openaire |e Política editorial | ||
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| 504 | |a GLEASON, J.D., FINNEY, S.C., PERALTA, S.H., GEHRELS, G.E., MARSAGLIA, K.M., Zircon and whole-rock Nd-Pb isotopic provenance of Middle and Upper Ordovician siliciclastic rocks, Argentine Precordillera (2007) Sedimentology, 54, pp. 107-136 | ||
| 504 | |a GOSEN, Von, W., Structural evolution of the Argentine Precordillera: The Río San Juan section (1992) Journal of Structural Geology, 14, pp. 643-667 | ||
| 504 | |a GOSEN, Von, W., Early Paleozoic and Andean structural evolution in the Rio Jáchal section of the Argentine Precordillera (1997) Journal of South American Earth Sciences, 10, pp. 361-388 | ||
| 504 | |a GUGGENHEIM, S., BAIN, D., BERGAYA, F., BRIGATTI, M., DRITS, V., EBERL, D., FORMOSO, M., WATANABE, T., Report of the Association International pour L'Etude Des Argiles (AIPEA) Nomenclature Committee for 2001; Order, Disorder and Crystallinity in Phyllosilicates and the use of the 'Crystallinity Index' (2002) Clays and Clay Minerals, 50, pp. 406-409 | ||
| 504 | |a HALLER, M. J. & RAMOS, V. A. 1984. Las ofiolitas famatinianas (eopaleozoico) de las provincias de San Juan y Mendoza. In IX Congreso Geológico Argentino, San Carlos de Bariloche. Actas 2 (ed. Comisión Editorial, 5-9 noviembre 1984), pp. 66-83. Buenos Aires: Asociación Geológica Argentina; HARRIS. A. G., REXROAD, C. B., LIERMAN, R. T. & ROSEMARY, A. A. 1990. Evaluation of a CAI anomaly, Putnam County, Central Indiana, U S.A.: Possibility of a Mississippi Valley-Type Hydrothermal System. Courier Forschungsinstitut Senckenberg 118, 253-66; JORDAN, T.E., ALLMENDINGER, R.W., DAMANTI, J.F., DRAKE, R.E., Chronology of motion in a complete thrust belt: The Precordillera, 30-31°S, Andes Mountains (1993) Journal of Geology, 101, pp. 135-156 | ||
| 504 | |a KAY, S. M., RAMOS, V. A. & KAY, R. W. 1984. Elementos mayoritarios y trazas de vulcanitas ordovícicas de la Precodillera Occidental: basaltos de rift oceánico temprano (?) próximos al margen continental. In IX Congreso Geológico Argentino, San Carlos de Bariloche. Actas 2 (ed. Comisión Editorial, 5-9 noviembre 1984), pp. 48-65. Buenos Aires: Asociación Geológica Argentina; KISCH, H. J. 1991. Development of slaty cleavage and degree of very-low grade metamorphism. Journal of Metamorphic Geology, 9 735-50; KÖNIGSHOF, P., Conodont colour alteration adjacent to a granitic intrusion, Harz mountain (1991) Neues Jahrbüch für Geologie und Paläontologie, H2, pp. 84-90 | ||
| 504 | |a KÖNIGSHOF, P., Conodont deformation patterns and textural alteration in Paleozoic conodonts: Examples from Germany and France (2003) Senckenbergiana lethaea, 83 (1-2), pp. 149-156 | ||
| 504 | |a KOVÁCS, S., ÁRKAI, P., Conodont alteration in metamorphosed limestones from northern Hungary, and its relationship to carbonate texture, illite crystallinity and vitrinite reflectance (1987) Conodonts: Investigative Techniques and Applications, pp. 209-229. , ed. R. L. Austin, pp, Chichester: Ellis Horwood Limited | ||
| 504 | |a KÜBLER, B. 1967. La cristallinité de l'illite et les zones tout á fait supérieures du métamorphisme. In Etages Tectoniques (ed. Colloque de Neuchâtel, 18-21 avril 1966), pp. 105-21. A la Baconniére, Neuchâtel: Université Neuchâtel; MERRIMAN, R.J., FREY, M., Patterns of very low-grade metamorphism in metapelitic rocks (1999) Low-grade metamorphism, pp. 61-107. , eds M. Frey & D. Robinson, pp, London: Blackwell Science Limited | ||
| 504 | |a NABELEK, P. I. 2002. Calc-silicate reactions and bedding-controlled isotopic exchange in the Notch Peak aureole, Utah: implications for differential fluid fluxes with metamorphic grade. Journal of Metamorphic Geology 20, 429-40; NICOLL, R. S. 1981. Conodont colour alteration adjacent to a volcanic plug, Canning Basin, Western Australia. BMR Journal of Australian Geology & Geophysics 6, 265-7; NICOLL, R.S., GORTER, J.D., Conodont colour alteration, thermal maturation and the geothermal history of the Canning basin, Western Australia (1984) The APEA Journal, 24, pp. 243-258 | ||
| 504 | |a NIETO, F., MATA, P.M., BAULUZ, B., GIORGETTI, G., ÁRKAI, P., PEACOR, D.R., Retrograde diagenesis, a widespread process on a regional scale (2005) Clay Minerals, 40, pp. 93-104 | ||
| 504 | |a NIETO, F., PEACOR, D.R., Regional retrograde alteration of prograde lower grade hydrated assemblages (1993) Terra Abstracts, 5, p. 419 | ||
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| 504 | |a RAMOS, V. A. 1988. The tectonics of the Central Andes; 30° to 33°S latitude. In Processes in Continental Lithospheric Deformation (eds S. Clark & D. Burchfiel), pp. 31-54. Boulder, Colorado: Geological Society of America, Special Paper no. 218; RAMOS, V.A., ESCAYOLA, M., MUTTI, D.I., VUJOVICH, G.I., Proterozoic-early Paleozoic ophiolites of the Andean basement of southern South America (2000) Ophiolites and Oceanic Crust: New Insights from Field Studies and the Ocean Drilling Program, pp. 331-349. , eds Y. Dilek, E. M. Moore, D. Elthon & A. Nicolas, pp, Boulder, Colorado: Geological Society of America, Special Paper no. 349 | ||
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| 520 | 3 | |a The Yerba Loca Formation (Middle-Upper Ordovician), exposed in the Western Precordillera, San Juan, Argentina, is made up of clastic-carbonate turbidites, and basic-ultrabasic rocks. It is affected by regional Siluro-Devonian very low-grade metamorphism that locally reaches greenschist facies. At Ancaucha creek, 45 conodont samples were taken from two sections that include 30 to 50 m thick sills. In order to analyse the thermal alteration patterns produced by these intrusive bodies, conodont Colour Alteration Index (CAI) is contrasted with optical petrography and X-ray diffraction analyses of clay minerals. The intrusions are dated as post-Darriwilian (Da2), as determined by conodont biostratigraphy of the host rock, which indicates the Paroistodus horridus Subzone of the Lenodus variabilis Zone. The distribution of CAI values defines a thermal aureole of about 2.5 times intrusion thickness that prevailed over the later very low-grade metamorphism. Metasomatism at Ancaucha creek is recorded by CAI values of 4 to 7, particularly restricted to a few layers close to the intrusions, as indicated by conodont textures and rock fabric. One-dimensional thermal computer simulation conforms to empirical data indicating temperatures greater than 600 °C for the contact zone, although it points out slightly narrower thermal aureoles. The clay mineral assemblage of most of the analysed samples (chlorite, illite, smectite and I/S mixed-layers) is complex and probably derives from several superimposed processes, thus representing non-equilibrium assemblages. In turn, KI values (0.27-0.32) indicate anchizone metamorphism, in agreement with regional CAI values of 4; consequently, the occurrence of smectite and I/S probably resulted from retrograde diagenesis processes. Copyright © Cambridge University Press 2008. |l eng | |
| 593 | |a CONICET and Museo de Paleontología, Universidad Nacional de Córdoba, P.O. Box 1598, X5000FCO Córdoba, Argentina | ||
| 593 | |a INGEIS (CONICET-UBA), Universidad Nacional de Buenos Aires, 1428 Buenos Aires, Argentina | ||
| 651 | 4 | |a ARGENTINA | |
| 651 | 4 | |a ARGENTINA | |
| 651 | 4 | |a SAN JUAN [ARGENTINA] | |
| 651 | 4 | |a SOUTH AMERICA | |
| 690 | 1 | 0 | |a CAI |
| 690 | 1 | 0 | |a CLAY MINERALOGY |
| 690 | 1 | 0 | |a CONODONT |
| 690 | 1 | 0 | |a CONTACT METAMORPHISM |
| 690 | 1 | 0 | |a ORDOVICIAN |
| 690 | 1 | 0 | |a PRECORDILLERA |
| 690 | 1 | 0 | |a AUREOLE |
| 690 | 1 | 0 | |a COMPUTER SIMULATION |
| 690 | 1 | 0 | |a CONODONT |
| 690 | 1 | 0 | |a CONTACT METAMORPHISM |
| 690 | 1 | 0 | |a CONTACT ZONE |
| 690 | 1 | 0 | |a GREENSCHIST FACIES |
| 690 | 1 | 0 | |a LOW GRADE METAMORPHISM |
| 690 | 1 | 0 | |a METASOMATISM |
| 690 | 1 | 0 | |a ORDOVICIAN |
| 690 | 1 | 0 | |a PALEOTEMPERATURE |
| 690 | 1 | 0 | |a PETROGRAPHY |
| 690 | 1 | 0 | |a THERMAL ALTERATION |
| 690 | 1 | 0 | |a TURBIDITE |
| 690 | 1 | 0 | |a PRECORDILLERA |
| 690 | 1 | 0 | |a CROTON OVALIFOLIUS |
| 690 | 1 | 0 | |a LENODUS VARIABILIS |
| 690 | 1 | 0 | |a PAROISTODUS HORRIDUS |
| 700 | 1 | |a Albanesi, G.L. | |
| 700 | 1 | |a Do Campo, M. | |
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