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- W2593985589 endingPage "2824" @default.
- W2593985589 startingPage "2803" @default.
- W2593985589 abstract "Abstract Silicic volcanic rocks at Hadjer el Khamis, near Lake Chad, are considered to be an extension of the Cameroon volcanic line (CVL) but their petrogenetic association is uncertain. The silicic rocks are divided into peraluminous and peralkaline groups with both rock types chemically similar to within‐plate granitoids. In situ U/Pb zircon dating yielded a mean 206 Pb/ 238 U age of 74.4 ± 1.3 Ma indicating the magmas erupted ∼10 million years before the next oldest CVL rocks (i.e., ∼66 Ma). The Sr isotopes (i.e., I Sr = 0.7021–0.7037) show a relatively wide range but the Nd isotopes (i.e., 143 Nd/ 144 Nd i = 0.51268–0.51271) are uniform and indicate that the rocks were derived from a moderately depleted mantle source. Thermodynamic modeling shows that the silicic rocks likely formed by fractional crystallization of a mafic parental magma but that the peraluminous rocks were affected by low temperature alteration processes. The silicic rocks are more isotopically similar to Late Cretaceous basalts identified within the Late Cretaceous basins (i.e., 143 Nd/ 144 Nd i = 0.51245–0.51285) of Chad than the uncontaminated CVL rocks (i.e., 143 Nd/ 144 Nd i = 0.51270–0.51300). The age and isotopic compositions suggest the silicic volcanic rocks of the Lake Chad region are related to Late Cretaceous extensional volcanism in the Termit basin. It is unlikely that the silicic volcanic rocks are petrogenetically related to the CVL but it is possible that magmatism was structurally controlled by suture zones that formed during the opening of the Central Atlantic Ocean and/or the Pan‐African Orogeny." @default.
- W2593985589 created "2017-03-16" @default.
- W2593985589 creator A5032499715 @default.
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- W2593985589 creator A5065799595 @default.
- W2593985589 creator A5091023525 @default.
- W2593985589 creator A5091416022 @default.
- W2593985589 date "2016-07-01" @default.
- W2593985589 modified "2023-10-16" @default.
- W2593985589 title "Late Cretaceous intraplate silicic volcanic rocks from the Lake Chad region: An extension of the Cameroon volcanic line?" @default.
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