Reassessing Glaciation in SW Gondwana During the mid-Carboniferous

Reassessment of mid-Carboniferous glacial extent in southwestern Gondwana (Rio Blanco Basin, Argentina) inferred from paleo-mass transport of diamictites

Authors:

1. Erik L. Gulbranson (a, b)
2. John L. Isbell (b)
3. Isabel P. Montañez (a)
4. C. Oscar Limarino (c, d)
5. Sergio A. Marenssi (c, d, e)
6. Kyle Meyer (a)
7. Clara Hull (a)

Affiliations:

a. Department of Geology, University of California-Davis, One Shields Ave, Davis, CA, 95616, USA

b. Department of Geosciences, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, USA

c. Department of Geology, University of Buenos Aires, Cuidad Universitaria, Pabellón II, 1428, Buenos Aires, Argentina

d. Consejo Nacional de Investigaciones Cientificas y Técnicas (CONICET), Argentina

e. Instituto Antártico Argentino, Cerrito 1248, C1010AAZ Buenos Aires, Argentina

Abstract:

Late Paleozoic glacial diamictites occur in many localities in western Argentina, indicating that the region was strongly affected by glaciation during the mid-Carboniferous (late Serpukhovian-early Bashkirian). In most instances these diamictites are found in steeply walled paleovalley settings in the Andean Precordillera. This study presents new data from a locality north of the Precordillera that suggests an additional, distinct, volume of ice existed in the region during the Carboniferous. The glacigenic diamictites in the Rio Blanco Basin were ultimately emplaced as gravity flows, precluding inferences of paleo-ice volume. Fold nose orientation and soft-sediment groove orientations within the diamictites indicate that the deposits were emplaced from north to south, suggesting that glacial ice was most likely not sourced from the proto-Precordillera at this locality, requiring the need for another ice center to the north of the basin. Diamictite facies indicates that the sediment was initially supplied to the study area by a warm-based glacier.