Intra-lamina grain size distributions; 1, heavy and light minerals from subaerial and subaqueous grain flow deposits
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Geology topics
H.A. Gibson
Publications and source records attributed to H.A. Gibson.
Availability of petrographic thin sections from thirty-five wells from National Petroleum Reserve in Alaska, North Slope, Alaska
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Availability of foraminifera and palynomorph reports from shothole samples of National Petroleum Reserve in Alaska
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Geologic map showing springs rich in carbon dioxide or or chloride in California
Carbon dioxide- and chloride-rich springs occur in all geologic provinces in California, but are most abundant in the Coast Ranges and the Great Valley. The carbon-dioxide-rich springs issue mainly from Franciscan terrane; they also are rich in boron and are of the metamorphic type (White, 1957). Based on isotopic data, either the carbon dioxide or the water, or both, may be of metamorphic origin. Because of high magnesium values, the water of many of the carbon-dioxide-rich springs is thought to have passed through serpentinite. The chloride-rich waters are most common in rocks of the Great Valley sequence. Nearly all are more dilute than present-day sea water. The similarity in isotopic compositions of the metamorphic carbon-dioxide-rich water and the chloride-rich water may indicate a similar extent of water-rock interaction.
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