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

GULBRANSON, E; ISBELL, J; MONTAÑEZ, I; LIMARINO C,; MARENSSI, S.A; HULL, C; MER, K

GONDWANA RESEARCH

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2014 vol. 25 p. 1369 - 1379

1342-937X

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 diamictitesare found in steeply walled paleovalley settings in the Andean Precordillera. This studypresents 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 glacigenicdiamictites in the Rio Blanco Basin were ultimately emplaced as gravity flows,precluding inferences of paleo-ice volume. Fold nose orientation and soft-sedimentgroove orientations within the diamictites indicate that the deposits were emplaced fromnorth 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 thebasin. Diamictite facies indicates that the sediment was initially supplied to the study areaby a warm-based glacier.