The Late Triassic-Early Jurassic volcanism of Morocco and Portugal in the framework of the Central Atlantic Magmatic Province: An overview
作者： Nasrrddine Youbi , Línia Tavares Martins , José Manuel Munhá , Hassan Ibouh , José Madeira
DOI: 10.1029/136GM010
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摘要: An overview on the Late Triassic-Early Jurassic Magmatic Province of Morocco and Portugal (TJMPMP) is presented. It comprises extrusive basalts, interbedded with clastic rocks sequences preserved in elongated rift basins, their feeder dikes sills. Paleontologic ages range from Upper Ladinian-Lower Carnian to Sinemurian for sediments, while available 40 Ar/ 39 Ar analysis yield a mean age 200±1,6 Ma volcanics. The volcanologic characteristics TJMPMP are those continental basaltic successions. subaerial lava flows pyroclastic deposits, sometimes deposited lacustrine environments, dikes, constituting an interesting volcanic sub-province Central Atlantic (CAMP) as most outcrops These correspond Low-Ti (TiO 2 11 suggesting that source may be within lithospheric mantle. nucleation rifting process have started at two different triple junctions, RRR junction near Florida RRT between Africa-Iberia-America.
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agu.org参考文章(76)
J. V. Wright, R. A. F. Cas, Volcanic successions, modern and ancient ,(1987)
WARREN MANSPEIZER, Chapter 3 - Triassic – Jurassic rifting and opening of the Atlantic: An overview Developments in Geotectonics. ,vol. 22, pp. 41- 79 ,(1988) , 10.1016/B978-0-444-42903-2.50008-7
DAVID WHITTINGTON, Chemical and physical constraints on petrogenesis and emplacement of ENA olivine diabase magma types Developments in Geotectonics. ,vol. 22, pp. 557- 577 ,(1988) , 10.1016/B978-0-444-42903-2.50028-2
H. Bertrand, The Mesozoic Tholeiitic Province of Northwest Africa: A Volcano-Tectonic Record of the Early Opening of Central Atlantic Springer, Berlin, Heidelberg. pp. 147- 188 ,(1991) , 10.1007/978-3-642-73966-8_7
JACQUES BEAUCHAMP, Triassic sedimentation and rifting in the High Atlas (Morocco) Developments in Geotectonics. ,vol. 22, pp. 477- 497 ,(1988) , 10.1016/B978-0-444-42903-2.50025-7
Stuart Ross Taylor, SM McLennan, The composition and evolution of the continental crust: rare earth element evidence from sedimentary rocks Philosophical Transactions of the Royal Society A. ,vol. 301, pp. 381- 399 ,(1981) , 10.1098/RSTA.1981.0119
P. E. Olsen, Giant Lava Flows, Mass Extinctions, and Mantle Plumes Science. ,vol. 284, pp. 604- 605 ,(1999) , 10.1126/SCIENCE.284.5414.604
John C. Lorenz, Synthesis of late paleozoic and triassic redbed sedimentation in Morocco LNES. ,vol. 15, pp. 139- 168 ,(1988) , 10.1007/BFB0011592
K. G. Cox, The Karoo Province Springer, Dordrecht. pp. 239- 271 ,(1988) , 10.1007/978-94-015-7805-9_7
L. J. G. Schermerhorn, H. N. A. Priem, N. A. I. M. Boelrijk, E. H. Hebeda, E. A. Th. Verdurmen, R. H. Verschure, Age and Origin of the Messejana Dolerite Fault-Dike System (Portugal and Spain) in the Light of the Opening of the North Atlantic Ocean The Journal of Geology. ,vol. 86, pp. 299- 309 ,(1978) , 10.1086/649692