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Page 748, results 18676 - 18700

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Mineral potential of felsic plutonic rocks in the north-central Arabian Shield, Kingdom of Saudi Arabia
W. J. Moore
1985, Open-File Report 85-6
Fourteen plutons of Late Proterozoie age potentially favorable for rare-element mineralization have been identified in a geochemical and petrographic assessment of felsic plutonic rocks in the north-central Arabian Shield (lat 23°00'-25°00' N., long 40°00'-45°00' E.). The plutons are highly fractionated, leucocratic granitoids assigned to a major magmatic pulse that spanned...
Floods in central, Southwest Oklahoma, October 17-23, 1983
L.D. Hauth
1985, Open-File Report 85-494
Storms of October 17-23, 1983, produced as much as 17 inches of rain as a result of Hurricane Tico. Rainfall amounts exceeded the 100-year, 24-hour storm frequency in some areas of the central and southwest parts of Oklahoma. An 11-county area experienced flooding with damages exceeding $12 million. Peak discharges...
Paleomagnetic investigations at Mahd adh Dhahab, Kingdom of Saudi Arabia
M. E. Gettings
1985, Open-File Report 85-15
Paleomagnetic studies of 25 oriented bedrock specimens from Jabal Mahd adh Dhahab, located 160 km southeast of Al Madinah, Kingdom of Saudi Arabia, have yielded important structural information relating to the geologic history of this base and precious metal deposit. Samples were collected along one traverse away from the mineralized...
Geochemistry of metavolcanic rocks from the Ranyah area, Kingdom of Saudi Arabia
Robert C. Greene
1985, Open-File Report 85-1
Major-element analyses of 26 samples from seven map units of metavolcanic rocks from the Ranyah area are compared with analyses in the literature of rocks from known tectonic settings. The evidence suggests that most of the layered rocks of the Ranyah area originated in immature island arcs. The Khaniq formation...
The Salma Caldera complex, northeastern Arabian Shield, Kingdom of Saudi Arabia
K.S. Kellogg
1985, Open-File Report 85-370
The upper Proterozoic Salma caldera is genetically part of an elongate alkali granitic massif, Jabal Salma. Comenditic ash-flow tuffs, the oldest recognized rocks of the caldera complex, were erupted during caldera collapse associated with the rapid evacuation of the upper, mildly peralkaline part of a zoned magma reservoir. Within the...
Data on the distribution and abundance of submersed aquatic vegetation in the tidal Potomac River and transition zone of the Potomac Estuary, Maryland, Virginia, and the District of Columbia, 1983-1984
Virginia Carter, N. B. Rybicki, R. T. Anderson, T. J. Trombley, G.L. Zynjuk
1985, Open-File Report 85-82
Data on the distribution and abundance of submerged aquatic vegetation were collected in the tidal Potomac River and transition zone of the Potomac Estuary during 1983 and 1984. Plant species were identifed on transects. Water-quality characteristics measured include temperature, specific conductance, and Secchi depth. Maps were made of the distribution...