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from article Hydrosphere
Dissolved (a) sodium and (b) sulfate in rain (in parts per million) over the continental United States (After R. M. Garrels and F. T. Mackenzie, Evolution of Sedimentary Rocks, W. W. Norton, 1971)
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Image
from article Hydrosphere
Accommodation of cations in aqueous solution. (After H. Blatt, G. Middleton, and R. Murray, Origin of Sedimentary Rocks, Prentice Hall, 1972)
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from article Hydrosphere
Distribution of dissolved gaseous oxygen (low values) and nutrient species (high concentrations) of orthophosphate ions at 26°22′.4N and 168°57′.5W in the Pacific Ocean. 1 m = 3.3 ft.
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from article Red Sea
Division of the Red Sea into regions representing different stages in the formation of an ocean basin. (After F. Martinez and J. R. Cochran, Structure and tectonics of the northern Red Sea: Catching a continental margin between rifting and drifting,…
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from article Basalt
Thin section of upper crust of lava about 1.2 in. (3 cm) from top; black is microcrystalline groundmass. 0.5 mm = 0.02 in.
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from article Basalt
Thin section of interior of lava shown in Fig. 1, but 26 ft (7.9 m) below the top of the flow. Clear plagioclase crystals are ophitically enclosed in large pyroxene grains up to 0.04 in. (1 mm) in diameter. Crystals of black magnetite are minor. A…
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from article Basalt
Growth of crystals as a function of temperature in basalt in Hawaiian lava. °F = (°C × 1.8) + 32. (After D. L. Peck, T. L. Wright, and J. G. Moore, Crystallization of tholeiitic basalt in Alae lava lake, Hawaii, Bull. Volcanol., 29:629–656, 1966)
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from article Basalt
Diagrams illustrating the compositions of basalts in terms of normative mineral formulas. Customarily, CaAl2Si2O8 (anorthite) is grouped together with NaAlSi3O8 (albite), and Fe2SiO4, FeSiO3, and CaFeSi2O6 are grouped with the corresponding Mg…
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from article Ordovician
Ordovician, the second period of the Paleozoic Era.
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from article Ordovician
Early Ordovician (Arenig) paleogeography, major rock suites, and potential ocean surface currents; based on remanent magnetism data supplemented by plots of the positions of shelf sea carbonates and reefs.
