Basalt

Rock type: 
Age: 
16 millions years

Russia, Khabarovsk Territory. Black, fine-grained, very strong, afyr rocks. Compose an erosion-denudation outlier. The microscope shows: elongated prismatic plagioclase crystals - 60%, size 0.2-1 mm; augite rounded grains - 25%, size 0.5-1 mm; rounded grains of serpentized olivine - 7%; magnetite - 5%. Secondary minerals - calcite, serpentine. Sometimes there are voids made by zeolite. Spectral analysis: F – 0,1%, Ba – 0,03%, Sr – 0,003%, Zr – 0,0005%, V - 0,01%, Ni – 0,003%, Pb - 0,003%, Cr - 0,003%, Sc - 0,003%, Ga - 0,002%, Be – 0,0003%. The chemical composition of basalts: SiO2 – 50,95%, TiO2 – 2,1%, Al2O3 – 15,29%, Fe2O3– 2,7%, FeO – 6,59%, MnO – 0,12%, MgO – 5,26%, CaO – 8,23%, K2O – 2,11%, Na2O – 3,39%, P2O5 – 0,54%, SO3 – 0,37%, CO2 – 0,19%, H2O – 1,78%. Visible thickness - 50 metres. Neogene. Miocene.

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