U-Pb geochronology of the Deccan Traps and relation to the end-Cretaceous mass extinction

Schoene, Blair; Samperton, Kyle M.; Eddy, Michael P.; Keller, Gerta; Adatte, Thierry; Bowring, Samuel A.; Khadri, S.; Gertsch, B.

doi:10.1126/science.aaa0118

Cited by 440 publications

(315 citation statements)

References 101 publications

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“…Sin embargo, recientes dataciones de las coladas basálticas del Decán (India) restringen su emisión a menos de 750 ka en torno al límite K/Pg (Schoene et al, 2015), renovando el interés de la hipótesis volcánica. Aunque el inicio de la fase principal del vulcanismo del Decán parece bien definido, existen discrepancias sobre el ritmo de las erupciones.…”

Section: Resultados Preliminaresunclassified

“…Aunque el inicio de la fase principal del vulcanismo del Decán parece bien definido, existen discrepancias sobre el ritmo de las erupciones. Schoene et al (2015) proponen que el 80% de las coladas basálticas se emitieron en los 250 ka anteriores al límite K/Pg (Figura 1) propiciando un evento de extinción previo a dicho límite. No obstante, las propuestas de Richards et al (2015) y Renne et al (2015) sugieren que sería el impacto de Chicxulub el que desencadenaría hasta el 70% de las coladas basálticas en aproximadamente los 500 ka siguientes al límite K/Pg (Figura 1).…”

Section: Resultados Preliminaresunclassified

“…No obstante, las propuestas de Richards et al (2015) y Renne et al (2015) sugieren que sería el impacto de Chicxulub el que desencadenaría hasta el 70% de las coladas basálticas en aproximadamente los 500 ka siguientes al límite K/Pg (Figura 1). Schoene et al (2015) (izquierda) y de Richards et al y Renne et al (2015) (derecha)…”

Section: Resultados Preliminaresunclassified

“…Los últimos 140 ka del Maastrichtiense en Caravaca se caracterizan por un retorno a las condiciones previas al episodio de estrés ambiental identificado entre 66,36-66,18 Ma, con asociaciones de foraminíferos planctónicos heterogéneas y muy diversas. En este sentido la hipótesis propuesta por Schoene et al (2015) no es avalada por los resultados obtenidos en la sección de Caravaca.…”

Section: Discussionunclassified

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X Conferencias y Seminarios del Doctorado en Geología

2018

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Section: Resultados Preliminaresunclassified

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X Conferencias y Seminarios del Doctorado en Geología

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“…The impact probably triggered the enormous Wai Subgroup of Deccan flood basalt lava flows, which may account for >70% of the Deccan Traps main-stage eruptions [16]. This eruption of the Deccan flood basalts is the same age at the Chicxulub impact [17], and released massive amount of CO 2 . This mass extinction of 76% of all species was a result of a rapid extreme climate change caused by both events.…”

Section: Earthmentioning

confidence: 99%

We are not alone: Extraterrestrial Technological Life in our Galaxy

Rg¹

2015

Astrobiol Outreach

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This paper is an evaluation of the number of technological civilizations presently in our Milky Way galaxy. The current estimate of the present number of Earth-like planets (± 25% of Earth's radius) in the habitable region of Sunlike stars is about 6.6 billion. Using a modified Drake Equation, "optimistic", "pessimistic" and "unlikely" estimates of six constraints indicate that about 40,000 technological civilizations are presently in our galaxy for a "pessimistic evaluation". Even "unlikely" values that are half the "pessimistic" values give over 600 technological civilizations in the galaxy. It would take a completely unrealistic value of 2.5% for each constraint to get just 1 technology (us). Therefore, we are almost surely not alone in our Milky Way galaxy. Furthermore, almost all of the extra-solar system technologies are probably much further advanced than ours, i.e., they probably began thousands to millions of years before our Industrial Revolution. It is possible, but highly uncertain, that we have been visited by one or more of these civilizations.

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Magmatic recharge in continental flood basalts: Insights from the Chifeng igneous province in Inner Mongolia

Lee

Chen

Zeng

2015

Geochem Geophys Geosyst

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Eruptive sequences can be used as windows into the thermal and chemical evolution of magma chambers. We examined a continuous vertical section of the Baichahe basalt flow associated with the late Cenozoic Chifeng flood basalt in Inner Mongolia, North China. From oldest to youngest, MgO increases, K 2 O, light rare earths and other incompatible elements decrease, and Nb/La and radiogenic Pb isotopic ratios increase, all of which indicate increasing primitiveness and decreasing contribution of crustal contamination with time. The variable Pb isotope and incompatible element ratios require a component of crustal contamination, most likely of the lower crust (unradiogenic Pb, and low Ce/Pb), in the earliest lavas. Fractional crystallization can explain some of the elemental systematics, but alone cannot explain variable incompatible element ratios and Pb isotopes, nor the temporal trend to more primitive compositions. Crustal assimilation with or without fractional crystallization also cannot explain all the elemental systematics. We find instead that recharge by a primitive magma, in combination with fractional crystallization and decreasing rates of crustal assimilation, is needed to explain the observed geochemical systematics. Our observations suggest that the delivery of fresh basalt to the magma chamber must increase at rates faster than the crust can be assimilated or that the rates of crustal assimilation must decrease. However, progressive addition of primitive magma should heat up the crust and lead to more crustal assimilation. We suggest that during the initial stages of forming a magma chamber, the magma cools and develops an outer crystalline rind of mafic to ultramafic cumulates. This results in a thickening nonconvecting chemical boundary layer, which serves to insulate the magma chamber from further assimilation of crust and cooling, the latter resulting in the reduction of crystallization rates and the buffering of magma compositions at more primitive compositions. We show that certain segments of other large igneous provinces also display an evolution toward more primitive magmas with time, indicating that magmatic recharge may be a common feature of basaltic magma chambers.

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U-Pb geochronology of the Deccan Traps and relation to the end-Cretaceous mass extinction

Cited by 440 publications

References 101 publications

X Conferencias y Seminarios del Doctorado en Geología

X Conferencias y Seminarios del Doctorado en Geología

We are not alone: Extraterrestrial Technological Life in our Galaxy

Magmatic recharge in continental flood basalts: Insights from the Chifeng igneous province in Inner Mongolia

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