Hydrogeologic and water-quality data for the East Management Unit of Dover Air Force Base, Kent County, Delaware, 1995-96
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Open-File Report↗
Geology topics
V. C. Smith
Publications and source records attributed to V. C. Smith.
Quantitative chemical analysis of lunar samples
In three lunar samples the high titanium contents previously reported were confirmed. Water and ferric oxide were absent.
Science↗
Biotites from granitic rocks of the central Sierra Nevada batholith, California
Biotites from plutonic rocks of the central Sierra Nevada and Inyo Mountains, California, have been examined and characterized by powder X-ray diffraction and optical and chemical methods. Compositions of the biotites define a trend in the compositional triangle Fe+3 Fe+2Mg. When related to the experimentally studied ternary system KFe 3 +3AlSisO 12 H- 1 -KFe 3 +2 AlSi 3 O 10 (OH) 2 -KMg 3 AlSi 3 O 10 (OH) 2 and coupled with the estimated positions of biotite solid solutions for different oxygen buffers, the trend suggests that oxygen fugacities in magmas during biotite crystallization were slightly higher than those defined by the Ni-NiO buffer. The compositional data also suggest that magmas were ‘buffered’ with respect to oxygen by oxides existing within the magmas themselves. Correlation between the Fe/(Fe+Mg) ratio, an inferred temperature indicator, and other elements is generally poor, which suggests that factors other than temperature at the time of crystallization exerted an important influence on compositions.
California↗
Spectrophotometric determination of fluorine in silicate rocks
The rock powder is sintered with a sodium carbonate flux containing zinc oxide and magnesium carbonate, the sinter-cake leached with water and the resulting solution filtered. Fluorine is separated from the acidified filtrate by steam distillation and determined spectrophotometrically by means of a zirconium-SPADNS reagent. If a multiple-unit distillation apparatus is used, 12 determinations can be completed per man-day.
Talanta↗