The Late Triassic-Early Jurassic volcanism of Morocco and Portugal in the framework of the Central Atlantic Magmatic Province: An overview

2003 ◽  
pp. 179-207 ◽  
Author(s):  
Nasrrddine Youbi ◽  
Línia Tavares Martins ◽  
José Manuel Munhá ◽  
Hassan Ibouh ◽  
José Madeira ◽  
...  
Keyword(s):  
Early Jurassic ◽  
Late Triassic ◽  
Central Atlantic Magmatic Province ◽  
Central Atlantic

scholarly journals Modeling the consequences on late Triassic environment of intense pulse-like degassing during the Central Atlantic Magmatic Province using the GEOCLIM model

2012 ◽  
Vol 8 (3) ◽  
pp. 2075-2110 ◽  
Author(s):  
G. Paris ◽  
Y. Donnadieu ◽  
V. Beaumont ◽  
F. Fluteau ◽  
Y. Goddéris
Keyword(s):  
Carbon Cycle ◽  
Carbon Isotope ◽  
Carbon Isotopic Composition ◽  
Late Triassic ◽  
Carbonate Production ◽  
Carbon Isotopic ◽  
Central Atlantic Magmatic Province ◽  
Igneous Provinces ◽  
Central Atlantic ◽  
Sedimentary Carbon

Abstract. The Triassic-Jurassic boundary (TJB) is associated with one of the five largest mass extinctions of the Phanerozoic. A deep carbon cycle perturbation and a carbonate production crisis are observed during the late Triassic. The Central Atlantic Magmatic Province (CAMP), one of the most important large igneous provinces of the Phanerozoic, emplaced at the TJB. To understand the carbon cycle perturbations observed at the TJB, we investigate the consequences of CO2 degassing associated to the CAMP emplacement on atmospheric and oceanic carbon cycle. The CO2 input within the atmosphere due to volcanism has been modeled using a global biogeochemical cycle box model (COMBINE) coupled with a climate model (FOAM). Weathering fluxes and CO2 equilibrium are constrained by the Rhaetian paleogeography and different scenarios of the CAMP emplacement are modeled. The study focuses (1) on the geological record and the carbonate productions crisis and (2) on the sedimentary carbon isotope record. For point (1), comparison of different modeling scenarios shows that a Gaussian CO2 emission distribution over the duration of the main activity phase of the CAMP fails in reproducing any of the geological observations, mainly the carbonate production crisis observed in the late Rhaetian sediments. Contrastingly, intense degassing peaks lead to successive decrease in carbonate production as observed in the geological record. For point (2), the perturbations of carbon cycle due to the degassing of CO2 with a mantellic carbon isotopic composition of −5‰ do not reproduce the intensity of the observed carbon isotope excursions. This was achieved in our model by assuming a mantellic carbon isotopic composition of −20‰. Even if this hypothesis requires further investigations, such low values may be associated to degassing of carbon from pools of light isotopic carbon located at the transition zone (Cartigny, 2010), possibly linked to setting of large igneous provinces (LIP's). Breakdown of biological primary productivity can also partially account for the sedimentary carbon isotope excursions and for the observed increase of atmospheric pCO2.

Late Triassic tholeiitic magmatism in Western Sicily: A possible extension of the Central Atlantic Magmatic Province (CAMP) in the Central Mediterranean area?

Lithos ◽  
2014 ◽  
Vol 188 ◽  
pp. 60-71 ◽  
Author(s):  
R. Cirrincione ◽  
P. Fiannacca ◽  
M. Lustrino ◽  
V. Romano ◽  
A. Tranchina
Keyword(s):  
Mediterranean Area ◽  
Late Triassic ◽  
Central Mediterranean ◽  
Central Atlantic Magmatic Province ◽  
Western Sicily ◽  
Central Atlantic ◽  
Tholeiitic Magmatism

A late Triassic 40Ar/39Ar age for the El Hammam high-REE fluorite deposit (Morocco): mineralization related to the Central Atlantic Magmatic Province?

2010 ◽  
Vol 45 (4) ◽  
pp. 323-329 ◽  
Author(s):  
Alain Cheilletz ◽  
Dominique Gasquet ◽  
Fouad Filali ◽  
Douglas A. Archibald ◽  
Massimo Nespolo
Keyword(s):  
Late Triassic ◽  
Central Atlantic Magmatic Province ◽  
Central Atlantic

scholarly journals The ‘Last Hurrah of the Reigning Darwinulocopines’? Ostracoda (Arthropoda, Crustacea) from the Lower Jurassic Moenave Formation, Arizona and Utah, USA

2018 ◽  
Vol 92 (4) ◽  
pp. 648-660 ◽  
Author(s):  
Lucas S. Antonietto ◽  
Lisa E. Park Boush ◽  
Celina A. Suarez ◽  
Andrew R.C. Milner ◽  
James I. Kirkland
Keyword(s):  
Asexual Reproduction ◽  
Fossil Record ◽  
Late Jurassic ◽  
Lacustrine Sediments ◽  
Lower Jurassic ◽  
Late Triassic ◽  
Geographical Isolation ◽  
Central Atlantic Magmatic Province ◽  
Central Atlantic ◽  
Moenave Formation

AbstractAn ostracode fauna is described from lacustrine sediments of the Hettangian, Lower Jurassic, Whitmore Point Member of the Moenave Formation. The Moenave is well known for its rich, Late Triassic?–Early Jurassic fossil record, which includes fossil fishes, stromatolites, ostracodes, spinicaudatans, and a diverse ichnofauna of invertebrates and vertebrates. Four ostracode species, all belonging to the suborder Darwinulocopina, were recovered from these sediments:Suchonellina globosa,S. stricta,Whipplella? sp. 1, andW.? sp. 2. The diversity and composition of the Whitmore Point Member ostracode fauna agree with previous interpretations about Lake Dixie and nearby paleoenvironments as shallow lakes inhabited by darwinulocopine species that survived the effects of the Central Atlantic Magmatic Province and the subsequent end-Triassic extinction and quickly recolonized these areas, thanks to asexual reproduction by parthenogenesis. The Lake Dixie region, in its geographical isolation, could represent the last episode of darwinulocopine dominance in nonmarine environments before the Late Jurassic diversification of the cypridocopine/cytherocopine modern ostracodes.

A tale of two extinctions: converging end-Permian and end-Triassic scenarios

2015 ◽  
Vol 153 (2) ◽  
pp. 332-354 ◽  
Author(s):  
BAS VAN DE SCHOOTBRUGGE ◽  
PAUL B. WIGNALL
Keyword(s):  
Mass Extinction ◽  
Late Triassic ◽  
Temperature Changes ◽  
Forest Dieback ◽  
Central Atlantic Magmatic Province ◽  
Igneous Provinces ◽  
Extinction Events ◽  
Central Atlantic ◽  
Mass Extinction Events ◽  
Cross Fertilization

AbstractThe end-Permian (c.252 Ma) and end-Triassic (c.201 Ma) mass-extinction events are commonly linked to the emplacement of the large igneous provinces of the Siberia Traps and Central Atlantic Magmatic Province, respectively. Accordingly, scenarios for both extinctions are increasingly convergent and cross-fertilization of ideas has become important. Here, we present a synthesis of extinction scenarios based on a critical assessment of the available palaeontological, sedimentological, geochemical and geophysical evidence. How similar were the extinction events, what gaps exist in our understanding and how can a comparison of the events enhance our understanding of each event individually? Our focus is on the most important proximate kill mechanisms including: climate change and atmospheric pollution; increased soil erosion, weathering and runoff; forest dieback and the spread of pathogens; and ocean temperature changes, anoxia and acidification. There is substantial evidence to suggest that very similar kill mechanisms acted upon late Permian as well as Late Triassic ecosystems, strengthening the hypothesis that the ultimate causes of the mass-extinction events were similar.

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