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Geochemistry of Komatiitic Basalt Dyke from Schirmacher Oasis, Queen Maud Land, East Antarctica
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Geochemistry of a Neoproterozoic/Phanerozoic basalt dyke of komatiitic affinity, in the Precambrian metamorphosed gneissic terrain of Schirmacher Oasis, Queen Maud Land, East Antarctica is reported here. The dyke is composed of olivine (Fo87-90) which is largely pristine, clinopyroxene, magnesiochromite and devitrified glass. Clinopyroxene exhibits microspinifex texture. It has moderately high MgO (14.10-15.10 %), Cr (569-813 ppm), Ni (457-629 ppm) and low K2O (0.46-0.68 9%) and TiO2, (0.93-1.00 %) contents and high CaO/AI2O3 (1.11-1.22) ratios. The dyke shbws Al-depleted (low Al2O3, TiO2, = 8.36-8.72, depleted HREE GdN = YbN = 1.66-1.96) signature. suggesting that the source magma was generated by low degree of partial melting of the mantle with garnet in the residue. LREE enrichment (LaN/YbN = 3.01-3.51) and negative Nb anomalies in the dyke samples further suggest crustal contamination of the source magma during ascent through the continental crust.
Keywords
Geochemistry, Basalt Dyke, Komatiitic Basalt, Mantle Plurne, Neoproterozoic/phanerozoic, East Antarctica.
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