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Page 5469, results 136701 - 136725

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Grade and Tonnage Relationships Among Copper Deposits
D.A. Singer, Dennis P. Cox, Lawrence J. Drew
1975, Professional Paper 907-A
Three types of copper deposits-porphyry, strata-bound, and massive sulfide-are described, and the distributions of tonnages and grades for 267 deposits are compared with normal and lognormal frequency distributions. The relationships between grades and tonnages are analyzed by examining the correlation coefficients of these variables. Conclusions reached include the following: (1)...
Studies for seismic zonation of the San Francisco Bay region
Roger D. Borcherdt
1975, Professional Paper 941-A
The analyses presented in the preceding six papers show that the geologic setting of the San Francisco Bay region has a dominant influence on potential earthquake hazards. The strong correlation between geologic conditions and the amount of earthquake damage in 1906 emphasizes the importance of this influence and demonstrates the...
Rutile and sphene in blueschist and related high-pressure facies rocks
M.C. Blake, Benjamin A. Morgan
1975, Open-File Report 75-36
Sphene and rutile are characteristic accessory minerals of blueschist facies metamorphic rocks. However, only sphene is present in the lowerr grade blueschist assemblages. In many areas of the world these blueschists pass into, or are in fault contact with, higher grade glaucophane schists, rutile-bearing amphibolites, and eclogites. The origin of...