Eolian dunes of the Botucatu Formation (Cretaceous) in southernmost Brazil: morphology and origin

Scherer, Claiton Marlon dos Santos

doi:10.1016/s0037-0738(00)00135-4

Cited by 199 publications

(161 citation statements)

References 27 publications

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“…1), presenting medium cross bedding and no distinctive characteristics in comparison to the reported ones for the other areas of the Paraná Basin (e.g., Scherer et al, 2000). The sediment flux measurements performed in three outcrops indicate sand movements to the north-northeast.…”

Section: Geological Aspects Of the Investigated Areamentioning

confidence: 78%

“…Throughout the province, the lavas often cover the Botucatu Formation of the Paraná Basin, which is interpreted as a typical dry eolian system (e.g., Scherer et al, 2000), reaching an area of approximately 1300 000 km 2 . The sedimentation process initiated at the Mid-Jurassic (Leonardi and Oliveira, 1990) and lasted until the Early Cretaceous.…”

Section: Geological Settingmentioning

confidence: 99%

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Volcanological aspects of the northwest region of Paraná continental flood basalts (Brazil)

Machado

Rocha-Júnior

Marques³

et al. 2015

Solid Earth

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Abstract. There has been little research on volcanological aspects of Paraná continental flood basalts (PCFBs), and all investigations have mainly been concentrated on the internal portions of the lava flows. Thus, this study describes for the first time morphological aspects of lava flows and structural characteristics caused by lava-sediment interaction in the northwestern PCFB province (NW-PCFB). Early Cretaceous (134 to 132 Ma) tholeiitic rocks of the PCFB were emplaced on a large intracratonic Paleozoic sedimentary basin (Paraná Basin), mainly covering dry eolian sandstones (Botucatu Formation). As this sedimentary unit is overlain by the basic lava flows of the PCFB, the interaction of lavas and unconsolidated sediments resulted in the generation of fluidal peperites. This aspect is significant because it shows that restricted wet environments should have existed in the Botucatu desert. The peperite zones of the NW-PCFB are associated with compound pahoehoe-type (P-type) flows and are always related to the first volcanic pulses. These flows have dispersed vesicles and sand-filled cracks in their base and top borders, as well as the presence of interlayered sandstones with irregular contacts and varied thicknesses. It is remarkable that, to the best of current knowledge, only in this area of the whole PCFB did the volcanic activity start with lowTi basalt flows of Ribeira type (TiO 2 < 2.3 wt %), which are scarce in the province.

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Section: Geological Aspects Of the Investigated Areamentioning

confidence: 78%

Section: Geological Settingmentioning

confidence: 99%

Volcanological aspects of the northwest region of Paraná continental flood basalts (Brazil)

Machado

Rocha-Júnior

Marques³

et al. 2015

Solid Earth

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“…plinths (Scherer, 2000;Mountney, 2006). The near-horizontal to low-angle surfaces inclined in the direction opposite to the dip of the foresets observed in sections oriented parallel to palaeoflow are interpreted as interdune migration surfaces formed through the climbing of aeolian dunes (Kocurek, 1996).…”

Section: Discussionmentioning

confidence: 99%

Sedimentary cycles in a Mesoproterozoic aeolian erg-margin succession: Mangabeira Formation, Espinhaço Supergroup, Brazil

Bállico

Scherer

Mountney

et al. 2017

Sedimentary Geology

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“…The duration of lava effusion is commonly considered to be less than one million years. The intimate relationship between the aeolian sandstones and the lava flow deposits, and the lack of regional-scale unconformities within the aeolian package suggest that the Botucatu Formation comprises a shorter time interval, as discussed by Scherer (2000). Therefore, the beginning of Cretaceous age, probably Valanginian, seems more adequate for the onset of aeolian sedimentation in the Botucatu Formation.…”

Section: Geological Settingmentioning

confidence: 93%

Zircon ages delimit the provenance of a sand extrudite from the Botucatu Formation in the Paraná volcanic province, Iraí, Brazil

Pinto

Hartmann

Santos

et al. 2015

An. Acad. Bras. Ciênc.

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Ion microprobe age determinations of 102 detrital zircon crystals from a sand extrudite, Cretaceous Paraná volcanic province, set limits on the origin of the numerous sand layers present in this major flood basalt province. The zircon U-Pb ages reflect four main orogenic cycles: Mesoproterozoic (1155-962 Ma), latest Proterozoic-early Cambrian (808-500 Ma) and two Palaeozoic (Ordovician-480 to 450 Ma, and Permian to Lower Triassic-296 to 250 Ma). Two additional small concentrations are present in the Neoarchean (2.8 to 2.6 Ga) and Paleoproterozoic (2.0 to 1.7 Ga). Zircon age peaks closely match the several pulses of igneous activity in the Precambrian Brazilian Shield and active orogeny in Argentina. A main delimitation of the origin of the sand is the absence of zircon ages from the underlying Cretaceous basalts, thus supporting an injectite origin of the sand as an extrudite that emanated from the paleoerg that constitutes the Botucatu Formation.

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Eolian dunes of the Botucatu Formation (Cretaceous) in southernmost Brazil: morphology and origin

Cited by 199 publications

References 27 publications

Volcanological aspects of the northwest region of Paraná continental flood basalts (Brazil)

Volcanological aspects of the northwest region of Paraná continental flood basalts (Brazil)

Sedimentary cycles in a Mesoproterozoic aeolian erg-margin succession: Mangabeira Formation, Espinhaço Supergroup, Brazil

Zircon ages delimit the provenance of a sand extrudite from the Botucatu Formation in the Paraná volcanic province, Iraí, Brazil

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