Basaltic lava flows covering active aeolian dunes in the Paraná Basin in southern Brazil: Features and emplacement aspects

Waichel, Breno Leitão; Scherer, Claiton Marlon dos Santos; Frank, Heinrich Theodor

doi:10.1016/j.jvolgeores.2007.11.004

Cited by 69 publications

(40 citation statements)

References 15 publications

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“…Sandstone lenses up to 20 m thick interlayered in the first basalt lava flows (Jerram et al, 1999(Jerram et al, , 2000Jerram and Stollhofen, 2002;Petry et al, 2007;Waichel et al, 2008) reveal that this system remained active during the magmatic event. However, new evidence of wet and locally silty sediment between basalt and silicic units and interlayered in the silicic units (end of the volcanic sequence) presented here reflect a paleoenvironmental change, from a dry climate in the beginning of the PMP volcanic activity to a more humid environment (fluvial-lacustrine) during the latest phases of the magmatism, as also evidenced by Waichel et al (2007) in peperites found in some basalt units of the PMP in contact with lacustrine sediments.…”

Section: Discussion and Concluding Remarksmentioning

confidence: 98%

“…2002) and South American continents (Petry et al, 2007;Waichel et al, 2008). Sandstone intertraps in rhyodacites in the Piraju-Ourinhos region (São Paulo State; Janasi et al, 2007;Luchetti, 2010), where the thick basaltic sequence is missing, were also known.…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

“…Some works on the PMP report peperites derived from the basalt-flow-sediment interaction (Petry et al, 2007;Waichel et al, 2007Waichel et al, , 2008, the most common types found in worldwide volcanic sequences. Nevertheless, structures observed in this study reveal that this interaction also occurred between silicic extrusive bodies and wet sediment.…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

“…These consist of sand bodies presenting aeolian structures such as bypass surfaces, single dunes, sand-filled cracks and multi-dune ergs (Jerram and Stollhofen, 2002;Petry et al, 2007;Waichel et al, 2008), representing a desert environment that persisted during the voluminous initial phase of basaltic volcanism. In this work, the occurrence of sedimentation and development of associated peperites in the final stage of the PMP (Paraná Magmatic Province) volcanic event is presented.…”

Section: Introductionmentioning

confidence: 99%

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New insights on the occurrence of peperites and sedimentary deposits within the silicic volcanic sequences of the Paraná Magmatic Province, Brazil

Luchetti¹,

Nardy²,

Machado³

et al. 2014

Solid Earth

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Abstract. The PMP (Paraná Magmatic Province) is characterized by lava flows of the Early Cretaceous Serra Geral Formation which covers about 75 % of the Paraná Basin (southern and southeastern Brazil), composed of a thick (up to 1600 m) volcanic sequence formed by a succession of petrographically and geochemically distinct units of basic and silicic composition. The whole package must have been emplaced during approximately 3 million years of nearly uninterrupted activity. A few aeolian sandstone layers, indicating arid environmental conditions (the Botucatu Formation), are interlayered in the lower basalts. Above the basalts, the Palmas and Chapecó Members are composed of silicic volcanic rocks (quartz latites, dacites, rhyodacites and rhyolites) and basalts. This paper presents new evidence of sedimentation episodes separating silicic volcanic events, expressed by the occurrence of sedimentary deposits. Interaction between the volcanic bodies and the coeval unconsolidated sediments formed peperites. The sediments were observed between basaltic lava flows and silicic rocks or interlayered in the Palmas-type rocks, between the Chapecó-type rocks and overlying basaltic flows, between silicic bodies of the Palmas and Chapecó types, and interlayered within Palmas-type units. The observed structures indicate that the sediments were still wet and unconsolidated, or weakly consolidated, at the time of volcanism, which, coupled with the sediment features, reflect environmental conditions that are different from those characterizing the Botucatu arid conditions.

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Section: Discussion and Concluding Remarksmentioning

confidence: 98%

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

New insights on the occurrence of peperites and sedimentary deposits within the silicic volcanic sequences of the Paraná Magmatic Province, Brazil

Luchetti¹,

Nardy²,

Machado³

et al. 2014

Solid Earth

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show abstract

“…Even if usually discontinuous, some of these deposits may persist laterally for over 1 km, and show typical sedimentary structures such as planeparallel layering; when thicker, they frequently show cross-bedding (e.g., outcrops RS-73 and GX-117 - Table 1 and Figure 1), reminiscent of structures typical of aeolian sediments of the Botucatu Formation, which is recognized to overlap in time with the Paraná lava flows (e.g., Waichel et al, 2007Waichel et al, , 2008 …”

Section: Discussionmentioning

confidence: 99%

Reply to the Discussion by Duarte and Hartmann on "volcanic stratigraphy of intermediate to acidic rocks in southern Paraná Magmatic Province, Brazil" by Polo and Janasi (2014), geologia USP. série científica, 14(2), 83-100

Polo

Janasi

2014

Geol. USP, Sér. cient.

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Mafic subvolcanic intrusions from the southern Paraná‐Etendeka Large Igneous Province, Brazil: Insights from geochemistry and Sr–Nd–Pb isotopes

et al. 2020

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The Early Cretaceous Paraná‐Etendeka Igneous Province is a predominantly tholeiitic sequence of continental flood basalts and silicic magmatism that is intimately associated with the rupture of the western Gondwana. Intrusions of tholeiitic compositions are very common within the province and represent the magmatic plumbing system that fed the lavas at the surface. The investigated dikes are in the southeast of the Paraná Basin, southermost Brazil. The Silica Saturated Olivine Tholeiite (SSOT) dikes show restricted isotopic ranges (87Sr/86Sri = 0.70570 to 0.70585; ɛNdi = −1.01 to −4.49; 206Pb/204Pb = 18.031), with no equivalent low‐Ti magma type in the Paraná Province, but are close to the isotopic ratios of low‐Ti magma types with MgO > 7 wt%, such as Nil Desperandum in the Etendeka Province. The Silica Supersaturated Tholeiite dikes show broader isotopic ranges (87Sr/86Sri = 0.70787 to 0.71336; ɛNdi = −2.51 to −8.65; 206Pb/204Pb = 18.578–19.049), similar to the Gramado magma‐type and Tafelberg magma‐type in the Paraná‐Etendeka Province. This variation may have occurred due to the contamination at the time of magma rise and extrusion. Isotopic modelling showed that the fractional crystallization process and crustal assimilation played an important role from the magma rise through the conduits to the extrusion of the lavas. For the most primitive SSOT dikes, fractional crystallization was the most important factor for the magma evolution. The behaviour of the trace elements revealed that the assimilation of crust rocks with both Palaeoproterozoic and Neoproterozoic ages can be considered.

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Basaltic lava flows covering active aeolian dunes in the Paraná Basin in southern Brazil: Features and emplacement aspects

Cited by 69 publications

References 15 publications

New insights on the occurrence of peperites and sedimentary deposits within the silicic volcanic sequences of the Paraná Magmatic Province, Brazil

New insights on the occurrence of peperites and sedimentary deposits within the silicic volcanic sequences of the Paraná Magmatic Province, Brazil

Reply to the Discussion by Duarte and Hartmann on "volcanic stratigraphy of intermediate to acidic rocks in southern Paraná Magmatic Province, Brazil" by Polo and Janasi (2014), geologia USP. série científica, 14(2), 83-100

Mafic subvolcanic intrusions from the southern Paraná‐Etendeka Large Igneous Province, Brazil: Insights from geochemistry and Sr–Nd–Pb isotopes

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