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• W2043114646 endingPage "277" @default.
• W2043114646 startingPage "257" @default.
• W2043114646 abstract "Reliable and acceptable radiometric ages (mainly 40Ar/39Ar) of igneous whole rocks from the Levant, representing non-orogenic igneous provinces, together with six igneous provinces of Gondwana, reveal 17 synchronous global magmatic events, including flood basalts. Their starting ages in the course of the last 205 million years (in Ma) are: 202, 190, 184, 169, 160, 145, 138, 125, 112, 97, 83, 69, 56, 44, 32, 17 and 5. The chronology of these events in Gondwana igneous provinces points to short-term magmatic cycles, consisting of magmatic events plus intermagmatic intervals, with an average duration of ca 13 m.y. The suggested synchronous events, which conform to geological periods and stage boundaries, probably reflect cycles of high-rate upper mantle upwellings that played a major role in the periodic ascent of melts across the lithosphere. The common geodynamic evolution of Gondwana igneous provinces was extension of the continental lithosphere, thinning, uplifting, breakup, massive igneous activity, spreading and drifting. All these provinces were affected by upwelling of lower mantle thermal anomalies. The chronology of magmatic events in each igneous province, which extended over thousands of kilometers and includes the plume provinces, suggests that the life-span (magmatic period) of these provinces averages 58 m.y., and in many cases, the first-term magmatic cycles are longer (11–17 m.y.) and more intensive. The periodic magmatism, which followed the breakup and dispersal of Gondwana, suggests an evolutionary scenario for the development of oceanic spreading centers by the ascent of one or more (coexisting) large plume heads across the upper mantle." @default.
• W2043114646 created "2016-06-24" @default.
• W2043114646 creator A5040832365 @default.
• W2043114646 date "2000-10-01" @default.
• W2043114646 modified "2023-10-01" @default.
• W2043114646 title "Synchronous magmatic cycles during the fragmentation of Gondwana: radiometric ages from the Levant and other provinces" @default.
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• W2043114646 doi "https://doi.org/10.1016/s0040-1951(00)00122-0" @default.
• W2043114646 hasPublicationYear "2000" @default.

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