Geochemistry and Petrogenesis of Lower Jurassic Mafic Rock Suites in the External Rif Belt, and Chemical Geodynamics of the Central Atlantic Magmatic Province (CAMP) in NW Morocco

2021 ◽  
Author(s):  
Faouziya Haissen ◽  
Mohamed Najib Zaghloul ◽  
Yildirim Dilek ◽  
Oriol Gimeno-Vives ◽  
Geoffroy Mohn ◽  
...  
Keyword(s):  
Mafic Rock ◽  
Lower Jurassic ◽  
Central Atlantic Magmatic Province ◽  
Rif Belt ◽  
Central Atlantic

scholarly journals Million-year-scale alternation of warm-humid and semi-arid periods as a mid-latitude climate mode in the Early Jurassic (Late Sinemurian, Laurasian Seaway)

2020 ◽  
Author(s):  
Thomas Munier ◽  
Jean-François Deconinck ◽  
Pierre Pellenard ◽  
Stephen P. Hesselbo ◽  
James B. Riding ◽  
...  
Keyword(s):  
Clay Mineral ◽  
Hydrological Cycle ◽  
Lower Jurassic ◽  
Climatic Conditions ◽  
Paris Basin ◽  
Burial Diagenesis ◽  
The North ◽  
Central Atlantic Magmatic Province ◽  
Central Atlantic ◽  
Semi Arid

Abstract. High resolution clay mineral and stable isotope (C, O) data are reported from the upper Sinemurian (Lower Jurassic) of the Cardigan Bay Basin (Llanbedr [Mochras Farm] borehole, northwest Wales) and the Paris Basin (Montcornet borehole, northern France) to highlight the prevailing environmental and climatic conditions. In both basins, located at similar palaeolatitudes of 30–35° N, the clay mineral assemblages comprise chlorite, illite, illite-smectite mixed-layers (R1 I-S), smectite and kaolinite in various proportions. Because the influence of burial diagenesis and authigenesis is negligible in both boreholes, the clay minerals are interpreted to be derived from the erosion of the Caledonian and Variscan massifs, including their basement and pedogenic cover. In the Cardigan Bay Basin, the variations in the proportions of smectite and kaolinite are inversely related to each other over the entire upper Sinemurian succession. As in the Pliensbachian, the stratigraphical distribution reveals an alternation of kaolinite-rich intervals reflecting strong hydrolysing conditions, and smectite-rich intervals indicating a semi-arid climate. Kaolinite is particularly abundant in the upper part of the obtusum Zone and in the oxynotum Zone, suggesting more intense hydrolysing conditions likely coeval with warm conditions responsible for an acceleration of the hydrological cycle. This interval is also marked by a negative excursion of δ13Ccarb and δ18Ocarb, which may confirm a warmer palaeoclimate, although these excursions may be exaggerated or overprinted by the carbonate diagenesis. In the north of the Paris Basin, the stratigraphical succession is much thinner compared to the Cardigan Bay Basin site, and the oxynotum Zone is either absent or highly condensed. The clay assemblages are dominantly composed of illite and kaolinite without significant stratigraphical trends, but a smectite-rich interval identified in the obtusum Zone is interpreted as a consequence of the emersion of the London-Brabant Massif following a lowering of sea-level. A long-term decrease of δ13Corg from the late oxynotum/early raricostatum zones is also recorded in the two sites and may precede or partly include the negative carbon-isotope excursion of the Sinemurian/Pliensbachian Boundary Event, recognised in most basins worldwide, and interpreted as a late pulse of the Central Atlantic Magmatic Province volcanism.

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.

scholarly journals Widespread elevated iridium in Upper Triassic–Lower Jurassic strata of the Newark Supergroup: implications for use as an extinction marker

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Lawrence H. Tanner ◽  
Frank T. Kyte ◽  
John H. Puffer
Keyword(s):  
Global Fallout ◽  
Hydrothermal Activity ◽  
Lower Jurassic ◽  
Organometallic Complexes ◽  
Flood Basalts ◽  
Central Atlantic Magmatic Province ◽  
Newark Supergroup ◽  
Extinction Events ◽  
Central Atlantic ◽  
Mass Extinction Events

Abstract Anomalous levels of iridium in sedimentary strata are associated with mass extinction events caused by impact events. In the case of the end-Triassic extinction event, the anomalies as well as the extinctions are linked to the eruption of the Central Atlantic Magmatic Province (CAMP) flood basalts. We report new data on concentrations of iridium in continental strata of the Fundy, Deerfield, Hartford and Newark basins, both above and below the oldest CAMP flows in these basins, that demonstrate that these anomalies are more common than previously known. We conclude that the enrichments were at least in some instances likely derived locally by concentration due to leaching directly from the lavas into sediments proximal to the CAMP flows due to post-eruptive hydrothermal activity. In other instances, the enrichments likely record the global fallout of aerosols and/or ash particles during the eruptions of the CAMP basalts. The common association of the highest levels of enrichment with organic matter suggests either redox control or stabilization by formation of organometallic complexes following post-eruptive redistribution. These findings demonstrate the importance of considering the distribution and magnitude of iridium anomalies in considering the source of the iridium and possible extinction mechanisms.

JURASSIC IGNEOUS ACTIVITY OF THE WHITE MOUNTAIN MAGMA SERIES AND THE CENTRAL ATLANTIC MAGMATIC PROVINCE: A TEMPORAL AND POSSIBLE GEODYNAMIC CONNECTION?

2016 ◽  
Author(s):  
Sean T. Kinney ◽  
◽  
Paul E. Olsen ◽  
Blair Schoene ◽  
Jill VanTongeren ◽  
...  
Keyword(s):  
Central Atlantic Magmatic Province ◽  
Igneous Activity ◽  
Central Atlantic ◽  
Magma Series

THE TRIASSIC-JURASSIC CENTRAL ATLANTIC MAGMATIC PROVINCE RECORD OF CONTINENTAL STRATA IN WESTERN PANGEA: THE ẟ13C RECORD OF WARNER VALLEY, UTAH

2019 ◽  
Author(s):  
Dennis Mmasa ◽  
◽  
Jordan Oefinger ◽  
Asher Boudreaux ◽  
Celina Suarez ◽  
...  
Keyword(s):  
Central Atlantic Magmatic Province ◽  
Warner Valley ◽  
Central Atlantic

Rhaetian tectono-magmatic evolution of the Central Atlantic Magmatic Province volcanism in the Betic Cordillera, South Iberia

Lithos ◽  
2021 ◽  
pp. 106230
Author(s):  
Alberto Pérez-López ◽  
Aitor Cambeses ◽  
Fernando Pérez-Valera ◽  
Annette E. Götz
Keyword(s):  
Betic Cordillera ◽  
Magmatic Evolution ◽  
Central Atlantic Magmatic Province ◽  
Central Atlantic

Morphology, internal architecture and emplacement mechanisms of lava flows from the Central Atlantic Magmatic Province (CAMP) of Argana Basin (Morocco)

2011 ◽  
Vol 357 (1) ◽  
pp. 167-193 ◽  
Author(s):  
Hind El Hachimi ◽  
Nasrrddine Youbi ◽  
José Madeira ◽  
Mohamed Khalil Bensalah ◽  
Línia Martins ◽  
...  
Keyword(s):  
Lava Flows ◽  
Central Atlantic Magmatic Province ◽  
Central Atlantic ◽  
Internal Architecture

Mapping and characterization from aeromagnetic data of the Foum Zguid dolerite Dyke (Anti-Atlas, Morocco) a member of the Central Atlantic Magmatic Province (CAMP)

2017 ◽  
Vol 708 ◽  
pp. 15-27 ◽  
Author(s):  
Mustapha Bouiflane ◽  
Ahmed Manar ◽  
Fida Medina ◽  
Nasrrddine Youbi ◽  
Abdelkrim Rimi
Keyword(s):  
Aeromagnetic Data ◽  
Dolerite Dyke ◽  
Central Atlantic Magmatic Province ◽  
Central Atlantic

Geochemistry of the Central Atlantic Magmatic Province (CAMP) in south-western Algeria

2010 ◽  
Vol 58 (2) ◽  
pp. 211-219 ◽  
Author(s):  
Moulley Charaf Chabou ◽  
Hervé Bertrand ◽  
Amar Sebaï
Keyword(s):  
Central Atlantic Magmatic Province ◽  
Western Algeria ◽  
Central Atlantic
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