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Danien. --- Geology, Stratigraphic --- Formations (géologie) --- Formations (Geology) --- Danien.

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Komatiites erupted billions of years ago as pulsating streams of white-hot lava. Their unusual chemical compositions and exceptionally high formation temperatures produced highly fluid lava that crystallized as spectacular layered flows. Investigation of the extreme conditions in which komatiites formed provides important evidence about the thermal and chemical evolution of the planet, and the nature of the Precambrian mantle. This monograph, written by three experts with long experience in the field, presents a complete account of the characteristics of komatiites including their volcanic structures, textures, mineralogy and chemical compositions. Models for their formation and eruption are evaluated (including the anhydrous vs. hydrous magmas controversy). A chapter is also devoted to the valuable nickel and copper ore deposits found in komatiites. Komatiite is a key reference for researchers and advanced students interested in petrology, Archaean geology, economic geology, and broader questions about the evolution of the Earth's crust and mantle.

Komatiite. --- Formations (Geology) --- Formations (Géologie) --- Mathematical models. --- Ultrabasic rocks. --- Geology, Stratigraphic --- Formations (Géologie) --- Geologic formations --- Geological formations --- Stratigraphic formations --- Lava --- Archaean --- Archaeozoic --- Archean --- Archeozoic --- Rocks, Ultrabasic --- Ultramafic rocks --- Igneous rocks

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The first comprehensive book of its kind, this comparison of key features of pension systems of OECD countries provides coverage of retirement ages, benefit accrual rates, ceilings, and indexation. Future pension entitlements are shown for full-career workers at different earnings levels. Indicators measure redistribution in pension systems, the cost of countries' pension promises, and potential resource transfer. Thirty country chapters explain pension systems and replacement rates in detail. Named a ""Notable Government Document"" by the American Library Association. "" Pensions at a Glance

Old age pensions --- Pensions --- Government policy --- Compensation --- Pension plans --- Retirement pensions --- Superannuation --- Employees --- OASI (Old age and survivors insurance) --- Old age and survivors insurance --- Older people --- Survivors' benefits (Old age pensions) --- Radioactive waste disposal in the ground --- Formations (Geology) --- Déchets radioactifs --- Formations (Géologie) --- Elimination dans le sol --- -Burial of radioactive wastes --- Ground radioactive waste disposal --- Underground radioactive waste disposal --- Hazardous waste sites --- Waste disposal in the ground --- Radioactive waste repositories --- Geologic formations --- Geological formations --- Stratigraphic formations --- Burial of radioactive wastes --- Formations (Géologie) --- Retirement income --- Annuities --- Social security individual investment accounts --- Vested benefits --- 620.9 --- Geology, Stratigraphic --- 620.9 Economics of energy in general --- Economics of energy in general --- Congresses --- Déchets radioactifs --- Congrès --- Radioactive waste disposal in the ground - Congresses --- Radioactive waste disposal in clay(Heating experim --- Radioactive waste disposal in salt(Heating experim --- Radioactive waste disposal in crystalline rocks(He