Methods for dating the earth

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This pocket guide examines the age of the earth from a biblical and scientific perspective.

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Radioactive isotopes used for dating fossils

They are often found along with alkaline silicate rocks, meaning that they contain relatively large amounts of Na2O and K2O, and important tools to understand mantle processes. The Alnö complex is located in the northern part of the island of Alnö, northeast of Sundsvall and is one of the biggest ring-shaped intrusions of the alkaline and carbonatite sort. The origin of carbonatites is not fully known yet but they may have resulted from a mantle plume, and absolute dating methods indicate that the age of the Alnö carbonatites are around Ma. A large amount of carbonatites have been found in the Alnö complex and the purpose of this thesis is to assess whether the Alnö complex and its carbonatites can become a potential source of REEs and if it can be profitable to mine these. The research has been conducted by first analyzing samples from the Alnö complex in thin sections through a light polarising microscope.

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