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the variations of rb, sr, and initial 87sr/ 86 sr in mesozoic granitic rocks, the sedimentation history during the late precambrian and paleozoic, and the geographic position of loci of mesozoic magmatism in the western united states are related to the development of the continental margin and different types of lithosphere during rifting.
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Felsite is a general term for any light-colored, fine-grained igneous rock composed chiefly of quartz and feldspar.Has sometimes been mistaken for slag.Scoria has an intermediate density, appreciably less than slag.Melted kiln lining has a very low density but is frequently vesicular.The romans used these rocks in a flour mill in.Read More
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