Middle Devonian microfloras and megafloras from western Argentina and southern Bolivia: their importance in the palaeobiogeographical and palaeoclimatic evolution of western Gondwana

Author:

di Pasquo M.1,Amenábar C. R.1,Noetinger S.1

Affiliation:

1. CONICET, National Research Council of Argentina, UBA, Department of Geological Sciences, Faculty of Pure and Natural Sciences University of Buenos Aires Ciudad Universitaria Pabellón II (1428) Capital Federal, Argentina

Abstract

AbstractThe study of microfloras and megafloras from western Argentina and southern Bolivia presented here extends our knowledge of the biodiversity and succession of floristic events during the Middle Devonian, and hence improves the current biostratigraphy. Among floral remains, species attributable to ‘Haplostigma’ are mostly recorded from the same Grandispora pseudoreticulata and other palynomorph-bearing sections at Balapuca (southern Bolivia) and Del Chaco and La Cortadera creeks in the Precordillera of Argentina. The northernmost record of Grandispora pseudoreticulata is recorded from a third palynoassemblage from the Pando x-1 corehole of northern Bolivia. A great similarity among all these assemblages (notably abundant Grandispora pseudoreticulata) suggests the identification of terrestrial connections, or at least proximity, of these local areas and other regions in South America during the Givetian. Comparison with other contemporary Gondwanan palynofloras shows cosmopolitan species (e.g. Geminospora lemurata, Samarisporites triangulatus, Archaeozonotriletes variabilis, Chelinospora concinna) along with some others with more restricted distribution (e.g. Grandispora pseudoreticulata, Leiotriletes balapucensis, Acinosporites ledundae). This pattern defines an Afro-South American Subrealm, which most likely results from the effects of palaeolatitude and, in a lesser way, local palaeoenvironmental conditions. On the other hand, such a level of cosmopolitanism supports previous palaeogeographical reconstructions where a narrow Rheic Ocean was developed between Euramerica and the northern parts of Africa and South America.

Publisher

Geological Society of London

Subject

Geology,Ocean Engineering,Water Science and Technology

Reference149 articles.

1. Albariño L. Dalenz-Farjat A. Alvarez L. Hernandez R. Pérez Leyton M. (2002) 5° Congreso de Exploración y Desarrollo de Hidrocarburos, Mar del Plata, Las secuencias sedimentarias del Devónico en el Subandino sur y el Chaco, Bolivia y Argentina (CD Trabajos Técnicos).

2. Alonso J. L. Rodríguez-Fernández L. R. García-Sansegundo J. Heredia N. Farias P. Gallastegui J. (2005) Gondwanic and Andean structure in the Argentine central Precordillera: The Río San Juan section revisited. 6° International Symposium on Andean Geodynamics (ISAG), Barcelona, Extended Abstracts, 36–39.

3. Integración de facies y biofacies en un análisis secuencial en plataformas clásticas devónicas del sur de Bolivia y noroeste argentino;Alvarez;Asociación Argentina de Sedimentología Revista,2003

4. Significado estratigráfico de palinomorfos retrabajados en la Formación Malimán (Viséano) en la Sierra del Volcán, Provincia de San Juan, Argentina. Resultados preliminares;Amenábar;Revista Brasileira de Paleontologia,2006

5. Amenábar C. R. (2007a) Field Meeting of the IGCP 499-UNESCO ‘Devonian Land-Sea Interaction: Evolution of Ecosystems and Climate’ (DEVEC) (2007, San Juan), New palynological assemblage from the Chigua Formation (late Early–Middle Devonian), at Del Chaco Creek, Volcán Range, Precordillera Argentina, eds Aceñolaza G. F. Vergel M. Peralta S. Herbst R. pp 92–96.

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