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Abstract:

Microbial oncoids have been found in the Oxfordian limestones of the La Manga Formation in the La Vaina section at Potimalal River, Mendoza province. The oncoids ocurr either in packstone or floatstone-rudstone or are scattered in the wackestones. They are mostly elliptical, ameboidal and subordinately spherical in shape. Different types of oncoids were recognized, according to their features of envelopes: (1) micritic laminations, (2) grumose laminations, and (3) organism-bearing laminations. Molluscs and echinoid fragments, peloids, and intraclasts acted as oncoid nuclei. Laminae follow the shape of nuclei, especially in the inner zone of the cortices. However, in the outer zones the laminae contain encrusting organisms dominated by nubeculariids and serpulids. Some oncoids, especially the ameboidal or elliptical forms, are characterized by multiple nuclei, represented by small oncoids. The oncoids are associated with bivalves, echinoderms, forams, and serpulids. The fauna is indicative of calm, shallow conditions and the excellent preservation of echinoderms suggests minimal transport prior to burial. Growth histories are in evidence. The oncoids grew in a shallow, low energy, slightly to moderate agitated subtidal normal sea water environment. The limited rolling growth oncoids was probably accompanished by intermittent currents that reoriented the oncoids parallel to stratification. The discontinuous organisms-bearing laminations reflect periods of non-agitation and litification, which facilitated the growth of encrusting organisms on static oncoid particles during a period of low sedimentation rate. Deposition of the oncoid-bearing limestones took place during shallowing of the carbonate interval and associated with emersion, subaerial exposition and paleokarst as consequence of sea level fluctuations.

Registro:

Documento: Artículo
Título:Osagids-types oncoids from La Manga Formation and their paleoecological significance, La Vaina Creek, Mendoza
Autor:Palma, R.M.; Bressan, G.S.; Kietzmann, D.A.
Filiación:Facultad de Ciencias Exactas y Naturales, Depto. de Ciencias Geológicas, Pabellón II, Ciudad Universitaria (1428) Buenos Aires, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
Palabras clave:Jurassic; La Manga Formation; Oncoids; bivalve; echinoderm; growth rate; Jurassic; lamination; limestone; microorganism; micropaleontology; morphology; oncolite; paleoecology; paleoenvironment; sedimentation rate; Argentina; Mendoza; South America; Bivalvia; Echinodermata; Echinoida; Foraminifera; Mollusca; Nubeculariidae; Serpulidae
Año:2007
Volumen:62
Número:1
Página de inicio:116
Página de fin:123
Título revista:Revista de la Asociacion Geologica Argentina
Título revista abreviado:Rev. Asoc. Geol. Argent.
ISSN:00044822
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00044822_v62_n1_p116_Palma.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v62_n1_p116_Palma

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Citas:

---------- APA ----------
Palma, R.M., Bressan, G.S. & Kietzmann, D.A. (2007) . Osagids-types oncoids from La Manga Formation and their paleoecological significance, La Vaina Creek, Mendoza . Revista de la Asociacion Geologica Argentina, 62(1), 116-123.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v62_n1_p116_Palma [ ]
---------- CHICAGO ----------
Palma, R.M., Bressan, G.S., Kietzmann, D.A. "Osagids-types oncoids from La Manga Formation and their paleoecological significance, La Vaina Creek, Mendoza " . Revista de la Asociacion Geologica Argentina 62, no. 1 (2007) : 116-123.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v62_n1_p116_Palma [ ]
---------- MLA ----------
Palma, R.M., Bressan, G.S., Kietzmann, D.A. "Osagids-types oncoids from La Manga Formation and their paleoecological significance, La Vaina Creek, Mendoza " . Revista de la Asociacion Geologica Argentina, vol. 62, no. 1, 2007, pp. 116-123.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v62_n1_p116_Palma [ ]
---------- VANCOUVER ----------
Palma, R.M., Bressan, G.S., Kietzmann, D.A. Osagids-types oncoids from La Manga Formation and their paleoecological significance, La Vaina Creek, Mendoza . Rev. Asoc. Geol. Argent. 2007;62(1):116-123.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v62_n1_p116_Palma [ ]