petrofacies

petrofacies

[¦pe·trō′fā·shēz]
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This paper addresses sand petrofacies formed during the Middle Aragonian (14.
5b; Dickinson, 1970), the petrofacies of the sand deposits appear quartz feldespathic in nature with provenance types related to geotectonic settings described by Dickinson et al.
Se realiza un estudio de petrofacies que hacen referencia a las diferencias de tipo composicional dependiendo de las asociaciones de detritos del armazon de la roca, en sentido vertical generando divisiones de tipo informal para cada seccion estratigrafica.
Las petrofacies se representan graficamente con la ubicacion de las muestras en la columna generalizada y un analisis particular para cada petrofacies.
Petrofacies and provenance of the Puente Formation (Middle to Upper Miocene), Los Angeles Basin, southern California: implications for rapid uplift and accumulation rates.
Litoestratigraficamente esta petrofacies marca el contacto inferior de la secuencia de la Formacion Caraigres con las calizas infrayacentes.
These authors identified four main petrofacies (A, B, C and D) within seven depositional sequences in the basin (DS 1-DS 7, see Fig.
Petrofacies 1A is a quartzolithic petrofacies with a mean composition of [Qm.
1996), in the Orobic Alps the abrupt change from this lithic petrofacies P1 to the quartzo-lithic petrofacies P2, observed in the Inferno Valley (Valtellina, Fig.
Detrital modes of some selected samples collected in the same unit by Fontana and Zuffa (1983) are consistent with the petrofacies P2 (Valsassina) or P1+P2 (Pizzo della Nebbia and Val Sanguigno in the Valtellina-Brembana-Seriana central sector of the Orobic Alps; Fig.
Thus, petrofacies are useful for analyzing depositional sequences and, consequently, the organization and develop of the clastic sedimentary record of the basin filling.
However, relationships between petrofacies and depositional sequences in continental settings have been poorly documented.