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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The Central Atlantic Magmatic Province at the Triassic-Jurassic boundary: Paleomagnetic and
40
Ar/
39
Ar evidence from Morocco for brief, episodic volcanism
Earth and Planetary Science Letters, Volume 228, No. 1-2, Year 2004
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Description
The Central Atlantic Magmatic Province (CAMP), one of the largest known flood basalt provinces formed in the Phanerozoic, is associated with the pre-rift stage of the Atlantic Ocean at the Triassic-Jurassic boundary ca. 200 Ma. Paleomagnetic sampling targeted packages of CAMP lava flows in Morocco's High Atlas divided into four basic units (the lower, intermediate, upper, and recurrent units) from sections identified on the basis of field observations and geochemistry. Oriented cores were demagnetized using both alternating field (AF) and thermal techniques. Paleomagnetic results reveal wholly normal polarity interrupted by at least one brief reversed chron located in the intermediate unit, and reveal distinct pulses of volcanic activity identified by discrete changes in declination and inclination. These variations in magnetic direction are interpreted as a record of secular variation, and they may provide an additional correlative tool for identification of spatially separated CAMP lava flows within Morocco. 40Ar/39 Ar analyses of Moroccan CAMP lavas yield plateau ages indistinguishable within 2σ error limits, sharing a weighted mean age of 199.9±0.5 Ma (2σ), reinforcing the short-lived nature of these eruptions despite the presence of sedimentary horizons between them. Correlation of our sections with the E23n, E23r, E24 sequence reported in the Newark basin terrestrial section and St. Audrie's Bay marine section is suggested. Brief volcanism in sudden pulses is a potential mechanism for volcanic-induced climatic changes and biotic disruption at the Triassic-Jurassic boundary. Combination of our directional group (DG) poles yields an African paleomagnetic pole at 200 Ma of λ(°N)=73.0° φ(°E)=241.3° (Dp=5.0°, Dm=18.5°). © 2004 Elsevier B.V. All rights reserved.
Authors & Co-Authors
Knight, Kim B.
United States, Berkeley
University of California, Berkeley
Nomade, Sébastien
United States, Berkeley
University of California, Berkeley
United States, Berkeley
Berkeley Geochronology Center
Renne, Paul Randall
United States, Berkeley
University of California, Berkeley
United States, Berkeley
Berkeley Geochronology Center
Marzoli, Andrea
Italy, Padua
Università Degli Studi Di Padova
Bertrand, Hervé
France, Lyon
École Normale Supérieure de Lyon
Youbi, Nasrrddine
Morocco, Marakech
Faculté Des Sciences Semlalia
Statistics
Citations: 240
Authors: 6
Affiliations: 5
Identifiers
Doi:
10.1016/j.epsl.2004.09.022
ISSN:
0012821X
Research Areas
Environmental
Study Locations
Morocco