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• W2105398467 endingPage "2081" @default.
• W2105398467 startingPage "2049" @default.
• W2105398467 abstract "Abundant dykes in the southern Etendeka region, NW Namibia, mostly contain 8–20% MgO. Almost all can be allocated to previously described Early Cretaceous magma types. Horingbaai-type basalts–picrites occur up to 120 km inland. Some have superficially mid-ocean ridge basalt (MORB)-like compositions: (La/Nb)n ∼1·0; (Sm/Lu)n ∼1·5; εNd >8; initial 87Sr/86Sr ∼0·7032. Others show major- and trace-element, and Sr–Nd–Pb isotopic evidence of contamination during upwelling by up to a few per cent of K-feldspar-rich upper crust. Extremely magnesian olivine macrocrysts (Fo91–93·3) in some Horingbaai picrites indicate that komatiitic (MgO ∼24%) liquids were associated with this suite, although they were too dense to reach the crustal levels currently exposed. Ferropicrite dykes resemble closely the nearby Etendeka ferropicrite basal lavas, with total iron (as Fe2O3) >MgO; (La/Nb)n ∼1·0–1·5; (Sm/Lu)n ∼2·5–7; εNd ∼2–3, except in samples with geochemical evidence of contamination by Archaean–Proterozoic lower crust. A few low-Ti dykes resemble geochemically the lavas of the main southern Etendeka succession, with (La/Nb)n ∼2·0–2·5; εNd = 0 to −8; initial 87Sr/86Sr >0·707. Dykes north of the Huab river define a fourth magma type, Nil Desperandum (ND), that may have fed part of the Huab sill complex. The dyke ages are constrained by their field relationships. Ferropicrite and low-Ti dykes are consanguineous with lavas erupted at 133 and 132 Ma, respectively. Both Horingbaai and ND dykes cut 132 Ma Etendeka lavas, and the main swarm of Horingbaai picrites with forsteritic macrocrysts is cut by the 131 Ma Brandberg plutonic complex. Forward and inverse modelling of the genesis of the ferropicrites and the Horingbaai picrite–komatiites gives two temporal ‘windows’ into physicochemical conditions within the head of the impacting Tristan mantle plume. At ∼133 Ma the southern Etendeka lithosphere was >100 km thick and only incipient melting of predominantly Fe-rich peridotite streaks occurred in the rising plume head (Tp = 1500°C). By ∼2 my later, pre-Atlantic extension had reduced the lithosphere thickness beneath and adjacent to NW Namibia, and there was intense melting (Tp = ∼1500–1700°C) of even depleted peridotite in the plume head." @default.
• W2105398467 created "2016-06-24" @default.
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• W2105398467 date "2001-11-01" @default.
• W2105398467 modified "2023-09-30" @default.
• W2105398467 title "Early Cretaceous Basalt and Picrite Dykes of the Southern Etendeka Region, NW Namibia: Windows into the Role of the Tristan Mantle Plume in Paraná–Etendeka Magmatism" @default.
• W2105398467 cites W1511542771 @default.
• W2105398467 cites W1545287913 @default.
• W2105398467 cites W1561193515 @default.
• W2105398467 cites W1574191480 @default.
• W2105398467 cites W1574937339 @default.
• W2105398467 cites W1578715279 @default.
• W2105398467 cites W1606717214 @default.
• W2105398467 cites W1617256856 @default.
• W2105398467 cites W1638012613 @default.
• W2105398467 cites W1963825843 @default.
• W2105398467 cites W1967156352 @default.
• W2105398467 cites W1972164452 @default.
• W2105398467 cites W1973012528 @default.
• W2105398467 cites W1975382122 @default.
• W2105398467 cites W1982863321 @default.
• W2105398467 cites W1984209488 @default.
• W2105398467 cites W1985356086 @default.
• W2105398467 cites W1986408395 @default.
• W2105398467 cites W1987666342 @default.
• W2105398467 cites W1987907556 @default.
• W2105398467 cites W1990740187 @default.
• W2105398467 cites W1990832360 @default.
• W2105398467 cites W2000842158 @default.
• W2105398467 cites W2002661136 @default.
• W2105398467 cites W2005300256 @default.
• W2105398467 cites W2005426441 @default.
• W2105398467 cites W2008782416 @default.
• W2105398467 cites W2008978689 @default.
• W2105398467 cites W2014178669 @default.
• W2105398467 cites W2015149055 @default.
• W2105398467 cites W2015407618 @default.
• W2105398467 cites W2015697995 @default.
• W2105398467 cites W2016020127 @default.
• W2105398467 cites W2018752314 @default.
• W2105398467 cites W2033223278 @default.
• W2105398467 cites W2034212688 @default.
• W2105398467 cites W2035020311 @default.
• W2105398467 cites W2035224483 @default.
• W2105398467 cites W2035651914 @default.
• W2105398467 cites W2038171999 @default.
• W2105398467 cites W2042971561 @default.
• W2105398467 cites W2045620949 @default.
• W2105398467 cites W2045994461 @default.
• W2105398467 cites W2046560796 @default.
• W2105398467 cites W2047567126 @default.
• W2105398467 cites W2058884294 @default.
• W2105398467 cites W2059703220 @default.
• W2105398467 cites W2060703165 @default.
• W2105398467 cites W2062007364 @default.
• W2105398467 cites W2065004370 @default.
• W2105398467 cites W2073281216 @default.
• W2105398467 cites W2077071750 @default.
• W2105398467 cites W2078132125 @default.
• W2105398467 cites W2078840355 @default.
• W2105398467 cites W2080394669 @default.
• W2105398467 cites W2083227715 @default.
• W2105398467 cites W2086250167 @default.
• W2105398467 cites W2088715187 @default.
• W2105398467 cites W2094291429 @default.
• W2105398467 cites W2102803873 @default.
• W2105398467 cites W2107131671 @default.
• W2105398467 cites W2116162173 @default.
• W2105398467 cites W2119313675 @default.
• W2105398467 cites W2122454290 @default.
• W2105398467 cites W2125107304 @default.
• W2105398467 cites W2127931472 @default.
• W2105398467 cites W2130958906 @default.
• W2105398467 cites W2141375290 @default.
• W2105398467 cites W2141611216 @default.
• W2105398467 cites W2141950469 @default.
• W2105398467 cites W2142858095 @default.
• W2105398467 cites W2143679365 @default.
• W2105398467 cites W2159381014 @default.
• W2105398467 cites W2160661732 @default.
• W2105398467 cites W2315422411 @default.
• W2105398467 cites W2319070632 @default.
• W2105398467 cites W2324661783 @default.
• W2105398467 cites W2325831225 @default.
• W2105398467 cites W2326756003 @default.
• W2105398467 cites W2489425925 @default.
• W2105398467 cites W2886385614 @default.
• W2105398467 cites W2900604720 @default.
• W2105398467 cites W43888549 @default.
• W2105398467 doi "https://doi.org/10.1093/petrology/42.11.2049" @default.
• W2105398467 hasPublicationYear "2001" @default.
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