Journal of Research of the U.S. Geological Survey, المجلد 5

Alaska amphibolite analysis approximately aquifer assemblage average basalt basin batholith biotite Bull California carbon channel chemical chlorite coefficient composition concentrations core County crater Creek Cretaceous deposits depth determined dikes diorite ejecta Eocene epidote equation fault flow fluoride Formation fractures gabbro gibbsite grains granite Hazel heat hornblende humic acid indicate injection intrusive isotope Jour K-Ar Lake land layers lower mafic measurements metamorphic meters method minerals Miocene Mountains mudflow North oxidation percent periphyton phytoplankton plagioclase pluton Precambrian quartz monzonite range ratio region Rept Research U.S. Geol Ridge River runoff samples sandstone sediment shale shown in figure solubility solution species sphene standard stream surface Survey Prof Survey Vol syenite technique temperature terrane Tertiary thorium tion Tortolita Mountains tuff U.S. Geological Survey ultramafic ultramafic rocks upper uranium USGS USNM values volcanic zone