Basin evolution as reflected by Miocene palynomorphs from the Chinches Formation, Frontal Cordillera (32ºS), San Juan Province, Argentina

E.G. Ottone ^[1] ; V.D. Varreda ^[2] ; D.J. Pérez ^[1]
1. [1] Universidad de Buenos Aires
  
  Universidad de Buenos Aires
  
  Argentina
2. [2] Centro de Investigaciones en Recursos Geológicos (CIRGEO) , Buenos Aires, Argentina
Localización: Revista española de micropaleontología, ISSN 0556-655X, Vol. 30, Nº. 3, 1998, págs. 35-48
Idioma: varios idiomas
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Resumen
- Palynological data from the Miocene Chinches Formation, eastern Espinacito Range, Frontal Cordillera (32°S), San Juan Province, Argentina, provide new information on the palaeogeographical evolution of Tertiary basins from southern South America. The palynoflora mainly reflects contributions of herbaceous and shrubby elements together with chlorococcaleans, scarce microforaminifera and dinoflagellate cysts, suggesting that a brackish marsh developed in a relatively dry climate. Miocene sea-waters apparently progressed from the southeast to the area also occupying the southern Grande River region (Yrigoyen, 1993). Tectonic controls on the marine transgressive event are briefly discussed.