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Abstract:

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.

Registro:

Documento: Artículo
Título:Conodont palaeothermometry of contact metamorphism in Middle ordovician rocks from the precordillera of western Argentina
Autor:Voldman, G.G.; Albanesi, G.L.; Do Campo, M.
Filiación:CONICET and Museo de Paleontología, Universidad Nacional de Córdoba, P.O. Box 1598, X5000FCO Córdoba, Argentina
INGEIS (CONICET-UBA), Universidad Nacional de Buenos Aires, 1428 Buenos Aires, Argentina
Palabras clave:Argentina; CAI; Clay mineralogy; Conodont; Contact metamorphism; Ordovician; Precordillera; aureole; computer simulation; conodont; contact metamorphism; contact zone; greenschist facies; low grade metamorphism; metasomatism; Ordovician; paleotemperature; petrography; thermal alteration; turbidite; Argentina; Precordillera; San Juan [Argentina]; South America; Croton ovalifolius; Lenodus variabilis; Paroistodus horridus
Año:2008
Volumen:145
Número:4
Página de inicio:449
Página de fin:462
DOI: http://dx.doi.org/10.1017/S001675680800455X
Título revista:Geological Magazine
Título revista abreviado:Geol. Mag.
ISSN:00167568
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00167568_v145_n4_p449_Voldman

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Citas:

---------- APA ----------
Voldman, G.G., Albanesi, G.L. & Do Campo, M. (2008) . Conodont palaeothermometry of contact metamorphism in Middle ordovician rocks from the precordillera of western Argentina. Geological Magazine, 145(4), 449-462.
http://dx.doi.org/10.1017/S001675680800455X
---------- CHICAGO ----------
Voldman, G.G., Albanesi, G.L., Do Campo, M. "Conodont palaeothermometry of contact metamorphism in Middle ordovician rocks from the precordillera of western Argentina" . Geological Magazine 145, no. 4 (2008) : 449-462.
http://dx.doi.org/10.1017/S001675680800455X
---------- MLA ----------
Voldman, G.G., Albanesi, G.L., Do Campo, M. "Conodont palaeothermometry of contact metamorphism in Middle ordovician rocks from the precordillera of western Argentina" . Geological Magazine, vol. 145, no. 4, 2008, pp. 449-462.
http://dx.doi.org/10.1017/S001675680800455X
---------- VANCOUVER ----------
Voldman, G.G., Albanesi, G.L., Do Campo, M. Conodont palaeothermometry of contact metamorphism in Middle ordovician rocks from the precordillera of western Argentina. Geol. Mag. 2008;145(4):449-462.
http://dx.doi.org/10.1017/S001675680800455X