Glaciomarine sequence stratigraphy in the Mississippian Río Blanco Basin, Argentina, southwestern Gondwana. Basin analysis and palaeoclimatic implications for the Late Paleozoic Ice Age during the Tournaisian
Posted on 2020-06-08 - 08:12
The Late Palaeozoic Ice Age (LPIA) has been well recorded in the uppermost Mississippian–Pennsylvanian of Gondwana. Nevertheless, little is known about the temporal and geographic dynamics, particularly during the early Mississippian. We report on exceptional Tournaisian glaciomarine stratigraphic sections from central Argentina (Río Blanco Basin). Encompassing ~1400 metres, these successions contain conspicuous glacigenic strata with age constraints provided by palaeontological data and U/Pb detrital zircon age spectra. A variety of marine, glaciomarine and fan-deltaic environments indicate relative sea-level variations mainly associated with tectonism and repetitive cycles of glacial activity. Provenance analysis indicates a source from the Sierras Pampeanas basement located to the east. Fifteen sequences were grouped into three depositional models: 1) Transgressive Systems Tracts (TST) to Highstand Systems Tracts (HST) sequences unaffected by glacial ice; 2) Lowstand Systems Tracts (LST) to TST and then to HST with glacial influence; 30 and 3) non-glacial Falling- Stage Systems Tract (FSST) to TST and HST. The glacial evidence indicates that the oldest Mississippian glacial stage of the LPIA in southwestern Gondwana is constrained to the middle Tournaisian. In contrast with previous descriptions of Gondwanan coeval glacial records, our sequence analysis confirms complex hierarchical climate variability, rather than a single episode of ice advance and retreat.
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Ezpeleta, Miguel; Rustán, Juan José; Balseiro, Diego; Dávila, Federico Miguel; Dahlquist, Juan Andrés; Vaccari, Norberto Emilio; et al. (2020). Glaciomarine sequence stratigraphy in the Mississippian Río Blanco Basin, Argentina, southwestern Gondwana. Basin analysis and palaeoclimatic implications for the Late Paleozoic Ice Age during the Tournaisian. Geological Society of London. Collection. https://doi.org/10.6084/m9.figshare.c.5011424.v1
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AUTHORS (10)
ME
Miguel Ezpeleta
JR
Juan José Rustán
DB
Diego Balseiro
FD
Federico Miguel Dávila
JD
Juan Andrés Dahlquist
NV
Norberto Emilio Vaccari
AS
Andrea Fabiana Sterren
CP
Cyrille Prestianni
GC
Gabriela Adriana Cisterna
MB
Miguel Basei
CATEGORIES
KEYWORDS
Glaciomarine sequence stratigraphypalaeoclimatic implicationsHighstand Systems Tractsdepositional modelsHSTGondwanan coevalTournaisian glaciomarine stratigraphic sectionsMississippian R ío Blanco BasinPalaeozoic Ice Agesequence analysisLPIAage constraintsTSTLSTPaleozoic Ice AgeSierras Pampeanas basementStage Systems TractR ío Blanco Basinclimate variabilityProvenance analysisfan-deltaic environmentssea-level variationsFSSTpalaeontological datamiddle Tournaisianglacigenic stratabasin analysisice advanceGeology