![^4^0Ar/^3^9Ar ages and duration of the Central Atlantic Magmatic Province volcanism in Morocco and Portugal and its relation to the Triassic-Jurassic ... Palaeoclimatology, Palaeoecology]](https://www.ebooknetworking.net/books/B00/0PD/bigB000PDSSAQ.jpg)
^4^0Ar/^3^9Ar ages and duration of the Central Atlantic Magmatic Province volcanism in Morocco and Portugal and its relation to the Triassic-Jurassic ... Palaeoclimatology, Palaeoecology]
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This digital document is a journal article from Palaeogeography, Palaeoclimatology, Palaeoecology, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
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The Central Atlantic Magmatic Province (CAMP) is the world's largest known continental igneous province and is contemporaneous with the Triassic-Jurassic (T-J) boundary that marks one of the five largest biological extinctions in the last 600 Ma. Although constraints on the duration of the CAMP volcanism remain yet poorly defined, the assumption that the CAMP may have had a causal relationship with the climatic and biotic crisis was suggested [Marzoli, A., Bertrand, H., Knight, K., Cirilli, S., Buratti, N, Verati, C., Nomade, S., Renne, P.R., Youbi, N., Martini, R., Allenbach, K., Neuwerth, R., Rapaille, C., Zaninetti, L., Bellieni, G., 2004. Synchrony of the Central Atlantic magmatic province and the Triassic-Jurassic boundary climatic and biotic crisis. Geology 32, 973-976.]. In this paper, we present new ^4^0Ar/^3^9Ar ages on basaltic flows from Moroccan (central High Atlas, Oujda and Argana) and Portuguese (Algarve and Santiago do Cacem) basins where CAMP lava flows are interlayered with T-J sedimentary sequences. In the Moroccan basins, where the basalts were erupted across the T-J boundary, well defined ^4^0Ar/^3^9Ar plateau ages (n=12) for more than 90% of the total erupted volume of CAMP basalts range from 197.8+/-0.7 Ma to 201.7+/-2.4 Ma and display a main restricted peak at 199.1+/-1 Ma providing a precise estimate of the ^4^0Ar/^3^9Ar age of the T-J boundary, concordant with the current U-Pb age [199.6+/-0.3 Ma; Palfy, J., Mortensen, J.K, Carter, E.S., Smith, P.L., Friedman, R.M., Tipper, H.W., 2000. Timing the end-Triassic mass extinction: First on land, then in the sea? Geology 28, 39-42.]. The topmost lava flows (recurrent unit) yield a significantly younger mean age of 196.6+/-0.6 Ma, highlighting late episodic eruption of CAMP magmas. These late basalts represent a small magma volume (
Description:
The Central Atlantic Magmatic Province (CAMP) is the world's largest known continental igneous province and is contemporaneous with the Triassic-Jurassic (T-J) boundary that marks one of the five largest biological extinctions in the last 600 Ma. Although constraints on the duration of the CAMP volcanism remain yet poorly defined, the assumption that the CAMP may have had a causal relationship with the climatic and biotic crisis was suggested [Marzoli, A., Bertrand, H., Knight, K., Cirilli, S., Buratti, N, Verati, C., Nomade, S., Renne, P.R., Youbi, N., Martini, R., Allenbach, K., Neuwerth, R., Rapaille, C., Zaninetti, L., Bellieni, G., 2004. Synchrony of the Central Atlantic magmatic province and the Triassic-Jurassic boundary climatic and biotic crisis. Geology 32, 973-976.]. In this paper, we present new ^4^0Ar/^3^9Ar ages on basaltic flows from Moroccan (central High Atlas, Oujda and Argana) and Portuguese (Algarve and Santiago do Cacem) basins where CAMP lava flows are interlayered with T-J sedimentary sequences. In the Moroccan basins, where the basalts were erupted across the T-J boundary, well defined ^4^0Ar/^3^9Ar plateau ages (n=12) for more than 90% of the total erupted volume of CAMP basalts range from 197.8+/-0.7 Ma to 201.7+/-2.4 Ma and display a main restricted peak at 199.1+/-1 Ma providing a precise estimate of the ^4^0Ar/^3^9Ar age of the T-J boundary, concordant with the current U-Pb age [199.6+/-0.3 Ma; Palfy, J., Mortensen, J.K, Carter, E.S., Smith, P.L., Friedman, R.M., Tipper, H.W., 2000. Timing the end-Triassic mass extinction: First on land, then in the sea? Geology 28, 39-42.]. The topmost lava flows (recurrent unit) yield a significantly younger mean age of 196.6+/-0.6 Ma, highlighting late episodic eruption of CAMP magmas. These late basalts represent a small magma volume (
