Sulfides are among the most important petrogenetic agents in magmatic systems. They are ubiquitous in most upper mantle rock types, common as inclusions in diamonds and they host significant amounts of geochemically and
The mineralogy of basalt is characterized by a preponderance of calcic plagioclase feldspar and pyroxene. Olivine can also be a significant constituent. Accessory minerals present in relatively minor amounts include iron oxides and
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Interweaving the relative time scale with the atomic time scale poses certain problems because only certain types of rocks, chiefly the igneous variety, can be dated directly by radiometric methods; but these rocks do not ordinarily
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