Zircon U–Pb geochronology from the Paraná bimodal volcanic province support a brief eruptive cycle at ~ 135 Ma

Pinto, Viviane Machado; Hartmann, Léo Afrâneo; Santos, João O.S.; McNaughton, Neal J.; Wildner, Wilson

doi:10.1016/j.chemgeo.2010.11.031

Cited by 104 publications

(42 citation statements)

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“…Many 40 Ar/ 39 Ar estimates were obtained by the laser total fusion method, since found to produce misleading results (Thiede and Vasconcelos, 2010) and subsequently rendering numerous early estimates unreliable. The most recent synthesis by Janasi et al (2011) supports a ≈3 Myr timeframe for volcanic activity, yet also highlights the small number of reliable estimates (by 40 Ar/ 39 Ar step heating or U-Pb) that sample the extrusive stratigraphy (Ernesto et al, 1999;Janasi et al, 2011;Pinto et al, 2011;Renne et al, 1992Renne et al, , 1996bThiede and Vasconcelos, 2010) and overlying/intruding units (Wigand et al, 2004).…”

Section: * Corresponding Authormentioning

confidence: 98%

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Long duration (>4 Ma) and steady-state volcanic activity in the early Cretaceous Paraná–Etendeka Large Igneous Province: New palaeomagnetic data from Namibia

Dodd

Niocaill

Muxworthy

2015

Earth and Planetary Science Letters

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There is long-standing correlation between Large Igneous Provinces (LIPs) and major mass extinction events in the Geological Record, postulated to be due to the emission of large quantities of volcanic gases over a geologically short period of time causing major climatic perturbations within the Earth system. The ∼135 Ma Paraná-Etendeka volcanic province of Brazil and Namibia represents something of an enigma amongst LIPs. Despite an erupted volume (>1 Mkm 3 ) comparable to other LIPs associated with mass extinctions, such as the Siberian or Deccan traps, it is not linked to a known mass extinction event. This suggests that the Paraná-Etendeka volcanic province was emplaced over longer timescales than other LIPs, and/or emitted a lower concentration of volatiles, directly or indirectly during its emplacement. We present a new, detailed magnetostratigraphy for the Etendeka portion of the province that suggests emplacement took place over longer timescales (>4 Ma) than those associated with other LIPs. Palaeomagnetic analysis of 893 specimens from 99 sites, in sections that encompass nearly the complete Etendeka stratigraphy, yielded high-quality data from 70 sites (612 specimens). These record 16 individual polarity intervals, which can be correlated with Chrons 15 to 11 of the geomagnetic polarity time scale (GPTS) while also providing two new, high quality palaeopoles for South Africa at 130-135 Ma. Our magnetostratigraphy reveals a minimum period of volcanic activity in excess of 4 Myrs and, importantly, we find no evidence for major changes in the rates of volcanic activity through that time period, in contrast to other LIPs where volcanism seems to be concentrated in major pulses. This suggests that the anomalously feeble environmental impact of Paraná-Etendeka volcanism may be due to lower effusion rates reducing the atmospheric loading due to volcanogenic volatiles.

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Section: * Corresponding Authormentioning

confidence: 98%

“…Several of these studies attempt to establish a range of absolute ages (e.g. Ernesto et al, 1999;Pinto et al, 2011;Renne et al, 1992), while the paleomagnetic studies generally focus upon the number of reversals recorded within the extruded stratigraphy (e.g. Ernesto and Pacca, 1988;Renne et al, 1992Renne et al, , 1996b.…”

Section: * Corresponding Authormentioning

confidence: 99%

Long duration (>4 Ma) and steady-state volcanic activity in the early Cretaceous Paraná–Etendeka Large Igneous Province: New palaeomagnetic data from Namibia

Dodd

Niocaill

Muxworthy

2015

Earth and Planetary Science Letters

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“…The GAV rocks cover this basaltic unit, forming tabular sequences with thicknesses up to 100 meters (Nardy et al, 2002). Literature data indicate that GAV whole-rock major element composition are remarkably similar, being classified as trachydacites (Bellieni et al, 1986;Garland et al, 1995;Nardy et al, 2008Nardy et al, , 2011Pinto et al, 2011;Luchetti et al, 2014; Table 2). Peate, 1997;Garland et al, 1995;Nardy et al, 2008;Freitas, 2009;Rocha-Júnior et al, 2013;Barreto et al, 2016.…”

Section: Geological Backgroundmentioning

confidence: 97%

“…This huge volume of lava is believed to have outpoured to surface in less than 4 M.y. , 1996, Pinto et al, 2011Janasi et al, 2011;Thiede and Vasconcelos, 2010;Baksi, 2017), which in geological terms is almost instantaneous.…”

Section: Multi-collectormentioning

confidence: 99%

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Petrological and volcanological insights into acid lavas from the Paraná-Etendeka Magmatic Province on the surroundings of Guarapuava city, Paraná, Southern Brazil: a contribution of detailed textural characterization combined with in situ Sr isotopes in plagioclase phenocrysts

Angelini¹

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contacts. Regardless of the petrographic association, the plagioclase is predominantly unzoned.Cathodoluminescence and scanning electron microscopy reveal the trachydacite groundmass to be composed of two petrographically distinct domains; one massive and continuous composed of a fine intergrowth of sanidine and quartz, and another one irregular and porous dominated only by sanidine.The dark bands observed on the respective outcrops are enriched in the former, whereas the light bands are relatively depleted in this and dominated by the latter type. All samples show concave-up crystal size distribution (CSD) curves, allowing sub-division in two groups: phenocrysts (> 3mm) and microphenocrysts (< 3mm). Such division bears relation with residence times and crystallization environment, estimated about 40 years in a deep-seated magmatic chamber (growth rate of 10 -9 mm.s together with the lack of pyroclastic textures/structures, ubiquitous presence of euhedral plagioclase crystals and isotopic homogeneity associated with the low water contents and high magmatic temperatures refutes a pyroclastic origin for such deposits. Otherwise, it is suggested a mainly effusive eruption style as vast acid lava flows fed by discrete conduits on the neighborhoods of Guarapuava.V AGRADECIMENTOSNinguém conquista nada e nem chega a lugar algum sozinho. A caminhada deste mestrado não foi diferente. Ele só foi possível graças a pessoas muito especiais que tenho a sorte de ter em minha vida e que mesmo diante dos momentos de desânimo, da falta de perspectiva, da grave crise financeira e política que o Brasil atravessa, nunca me deixaram pra baixo. Este trabalho é dedicado aos meus pais, Pedro e Nair. Por último, mas não menos importantes, este parágrafo é dedicado a todos meus amigos e amigas.Ano passado tive a honra de ser padrinho de dois casamentos, Juliana e Leandro e Lucas (Shun-Lee) e Asdra, sou muito grato pelo convite e mais uma vez desejo toda felicidade do mundo aos casais.Contem comigo pra tudo. Pra variar, amigos da Geologia, Santandreia F. R., vocês tornam tudo mais fácil e divertido, mesmo depois de quase 10 anos estamos firmes e fortes. Aliás, esse ano tem Cambury edição especial. Grandes amigos do Ofélia: Pará, Alê, Waldyr, Nico, Trick, Du, Caio, André, Secolin, Lucão, Pizzo, Flávio, Sylvio, valeu por tudo, é bom demais ter vocês como amigos. E, por fim, agradeço ao time de basquete da Geologia -USP. Que incrível descobrir um novo esporte depois de velho e aprender com alguns dos melhores jogadores da USP, muito obrigado e rumo ao tetra do BIFE.Tenho certeza que estou saindo deste mestrado uma pessoa melhor, um pesquisador mais crítico e um geólogo mais completo que quando entrei. Valeu a pena.VII

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Preliminary Appraisal of a Correlation Between Glaciations and Large Igneous Provinces Over the Past 720 Million Years

Youbi

Ernst

Mitchell

et al. 2021

Large Igneous Provinces

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Zircon U–Pb geochronology from the Paraná bimodal volcanic province support a brief eruptive cycle at ~ 135 Ma

Cited by 104 publications

References 47 publications

Long duration (>4 Ma) and steady-state volcanic activity in the early Cretaceous Paraná–Etendeka Large Igneous Province: New palaeomagnetic data from Namibia

Long duration (>4 Ma) and steady-state volcanic activity in the early Cretaceous Paraná–Etendeka Large Igneous Province: New palaeomagnetic data from Namibia

Petrological and volcanological insights into acid lavas from the Paraná-Etendeka Magmatic Province on the surroundings of Guarapuava city, Paraná, Southern Brazil: a contribution of detailed textural characterization combined with in situ Sr isotopes in plagioclase phenocrysts

Preliminary Appraisal of a Correlation Between Glaciations and Large Igneous Provinces Over the Past 720 Million Years

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