The Carboniferous-Permian boundary in the central western Argentinean basins: paleontological evidences

Cisterna, Gabriela A.; Sterren, Andrea F.; Gutiérrez, Pedro Raúl

doi:10.5027/andgeov38n2-a06

Cited by 23 publications

(17 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The main transgression, represented by FA 5, is characterized at La Herradura Creek by the oldest faunal assemblages of the TS fauna (Cisterna et al, 2011). Palynological assemblages here analyzed from the same beds bearing marine invertebrates confirm the original Pennsylvanian age assigned to the TS Biozone by Sabattini et al (1990).…”

Section: Age and Discussionsupporting

confidence: 64%

“…Although an scarce fauna was recognized in marine beds from the easternmost records of the transgression at La Ciénaga locality (17 km to southeast of the La Herradura Creek), these horizons were correlated with the marine interval identified in the middle part of the La Herradura Creek by Desjardins et al (2009) and Cisterna et al (2011). A sample of a tonstein from shallow marine deposits at La Ciénaga (facies association VII by Desjardins et al, 2009) yields a 206 Pb/ 238 U age of 312.82±0.11 Ma.…”

Section: Age and Discussionmentioning

confidence: 99%

“…A Late Pennsylvanian age was suggested for this biozone by Sabattini et al (1990); González (1997); Taboada (1997); Kelly et al (2001) and Dineen et al (2012). However, Archbold et al (2004) and Cisterna et al (2002Cisterna et al ( , 2006Cisterna et al ( , 2011 …”

Section: Geological and Paleontological Settingmentioning

confidence: 99%

“…The above described lower and middle parts of the facies association represent transgressive systems tract deposits while the upper part corresponds to sedimentation under highstand conditions. The TS Biozone studied by Cisterna et al (2002Cisterna et al ( , 2011 was recovered from these levels. The fossiliferous levels are located immediately below the thicker package of limestones and a few meters over the thinner package of limestones (see figure 2 in Cisterna et al, 2002).…”

mentioning

confidence: 92%

“…The outcrops of the La Herradura Creek were proposed as the holostratotype of the biozone and its Pennsylvanian age was accepted by different authors (González, 1993;Sabattini et al, 1990;Taboada, 1997Taboada, , 2010. However, the age of the biozone was a matter of debate and a Cisuralian age was proposed for the fauna (Archbold et al, 2004;Cisterna et al, 2002Cisterna et al, , 2005Cisterna et al, , 2011.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Afloramientos carboníferos en la quebrada La Herradura, Provincia de San Juan (oeste de Argentina), revisados: edad de las transgresiones.

Loinaze

Limarino

Césari³

2014

Andgeo

View full text Add to dashboard Cite

ABSTRACT. At the outcrops of the Tupe Formation in the La Herradura Creek, San Juan Province, two transgressive events are recorded, which range from few meters to tens of meters in thickness. These strata correspond to the stratotype of the faunal Tivertonia jachalensis-Streptorhynchus inaequiornatus Biozone. An evaluation of the timing of the two marine transgressions is made on the basis of palynological assemblages and available radiometric ages. A short-lived transgression is recorded in the latest Bashkirian-early Moscovian, and then a substantial sea level fall took place forming an irregular incision surface. Later, a major high eustatic sea-level occurred during the middle Moscovian resulting in a more important marine ingression. The palynological assemblages associated to the older transgressive event indicate the presence of the Raistrickia densa-Convolutispora muriornata (DM) Biozone (Subzone B). Palynofloras referred to the Subzone C of the DM Biozone characterize the strata of the younger transgression that also bear marine fauna of the Tivertonia jachalensis-Streptorhynchus inaequiornatus Biozone. Correlations with other Pennsylvanian outcrops in the region give support to the stratigraphic scheme here proposed. Keywords: Pennsylvanian, Argentina, Transgressions, Palynology. RESUMEN. Afloramientos carboníferos en la quebrada La Herradura, provincia de San Juan (oeste de Argentina), revisados: edad de las transgresiones. En los afloramientos de la Formación Tupe en la quebrada de La Herradura, provincia de San Juan, se registran dos eventos transgresivos, cuya magnitud varía desde unos pocos metros a decenas de metros de espesor. Estos estratos corresponden al estratotipo de la biozona faunística Tivertonia jachalensis-Streptorhynchus inaequiornatus. En esta contribución se presenta una evaluación y ajuste de la edad de las dos transgresiones marinas, sobre la base de las asociaciones palinológicas y las dataciones radiométricas disponibles. Una transgresión de corta duración se registró en el Bashkiriano tardío-Moscoviano temprano, a la que siguió una sustancial caída del nivel del mar, y originó una superficie de incisión irregular. Posteriormente, significativas condiciones de mar alto se produjeron durante el Moscoviano medio, lo que resultó en una más importante ingresión marina. Las asociaciones palinológicas relacionadas con el evento más antiguo pueden ser asignadas a la Subzona B de la Biozona Raistrickia densa-Convolutispora muriornata (DM). Palinofloras referidas a la Subzona C de la Biozona DM caracterizan los estratos de la transgresión más joven, donde también se reconoce la fauna marina de la Biozona Tivertonia jachalensisStreptorhynchus inaequiornatus. Las correlaciones con otros afloramientos pennsylvanianos en la región dan soporte al esquema estratigráfico aquí propuesto.

show abstract

Section: Age and Discussionsupporting

confidence: 64%