Pennsylvanian and Permian sequences in Bolivia: Direct responses to Gondwana glaciation

Grader, George W.; Isaacson, Peter E.; Díaz-Martínez, Enrique; Pope, Michael C.

doi:10.1130/2008.2441(10)

Cited by 18 publications

(47 citation statements)

References 28 publications

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“…The formation of the erosional unconformity across the PPT is consistent with a eustatic drop in the earliest Permian. Additionally, the formation of this sequence boundary does not appear to be related to regional tectonic uplift, which further supports a glacioeustatic control (Grader et al, 2008).…”

Section: Boliviamentioning

confidence: 54%

“…A major sequence boundary occurs at the Pennsylvanian-Permian boundary within the carbonate dominated Copacabana Formation (at 299 Ma; see Figure 2). Grader et al (2008) correlated this erosional boundary with the beginning of the P1 glacial epoch in eastern Australia, of Fielding et al (2008a). Higher up in the succession, a regionally extensive latest Sakmarian-early Artinskian flooding surface represents a period of high relative sea level throughout the region (Grader et al, 2008).…”

Section: Boliviamentioning

confidence: 72%

“…Although not globally synchronous, major transgression events are recorded in many of the Lower Permian stratigraphic records (see Figure 2). Many of these regionally significant transgressions occurred during or after the mid-Sakmarian and are often attributed by authors to eustatic rise following the major deglaciation of Gondwana (Grader et al, 2008;. In three of the studied successions, the Barents Shelf, North Alaska, and Bolivia, transgressions correspond with a loss in well-defined depositional cyclicity (Beauchamp and Baud, 2002;Grader et al, 2008;.…”

Section: Synthesis Of Global Stratigraphic Patternsmentioning

confidence: 89%

“…nan sections hinders correlations between hemispheres. In some cases, such as Bolivia (part of Gondwana), fusulinids are present, which represent the primary biostratigraphic tool available to correlate these ice-proximal sections to northern Pangaean records (Newell et al, 1953;Grader et al, 2008). Absolute age control has solved some of these issues.…”

Section: Global Correlationsmentioning

confidence: 99%

“…Many of these regionally significant transgressions occurred during or after the mid-Sakmarian and are often attributed by authors to eustatic rise following the major deglaciation of Gondwana (Grader et al, 2008;. In three of the studied successions, the Barents Shelf, North Alaska, and Bolivia, transgressions correspond with a loss in well-defined depositional cyclicity (Beauchamp and Baud, 2002;Grader et al, 2008;. A lack of global synchronicity implies that these post-Sakmarian transgression events may reflect local/regional changes in sedimentation and tectonics, rather than a single eustatic rise following deglaciation.…”

Section: Synthesis Of Global Stratigraphic Patternsmentioning

confidence: 99%

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The Pennsylvanian–Permian transition in the low-latitude carbonate record and the onset of major Gondwanan glaciation

Koch

Frank

2011

Palaeogeography, Palaeoclimatology, Palaeoecology

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Recent studies suggest a marked expansion of glacial ice across much of Gondwana beginning in the earliest Permian. Because expansion of glacial ice results in a lowering of sea level, the imprint of ice expansion should be evident worldwide as significant exposure event, hiatuses, or other evidence for sea level drop at or near the Pennsylvanian-Permian boundary. This literature review investigates the signature of an Early Permian expansion of Gondwanan ice through examination of stratigraphic records from eight carbonate-dominated, palaeotropical regions across Pangaea. Tropical carbonate environments are used because most form in tectonically quiescent regions and are sensitive indicators of eustatic change. Correlation between stratigraphic sections is achieved using the most current biostratigraphic and absolute time constraints available. All studied sections show a sequence boundary or basinward shift in facies at or near the Pennsylvanian-Permian boundary, supporting the hypothesis of a significant expansion of glacial ice and global eustatic lowstand beginning in the Early Permian. By contrast, a series of mid-Sakmarian-Kungurian transgression events in the palaeotropics are interpreted to reflect the asynchronous deglaciation of Gondwana. The stratigraphic framework developed herein will allow for better correlations among stratigraphic records from Gondwana and northern Pangaea, which will ultimately improve the understanding of how carbonate systems respond to global icehouse conditions, such as during the late Palaeozoic.

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Section: Boliviamentioning

confidence: 54%

Section: Boliviamentioning

confidence: 72%