United States Geological Survey Yearbook |
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Page 18
These rocks are similar to Precambrian basement rocks in Canada that contain ,
in addition to gold , major deposits of copper , nickel , lead , and zinc . The
Geological Survey's midcontinent mineral - resource investigations will focus on
the ...
These rocks are similar to Precambrian basement rocks in Canada that contain ,
in addition to gold , major deposits of copper , nickel , lead , and zinc . The
Geological Survey's midcontinent mineral - resource investigations will focus on
the ...
Page 30
MINERAL - RESOURCE SURVEYS formation of granitic magma , provided water
- rich fluids that leached gold and other elements from the host rocks and then
deposited them in fractures that now form the gold - bearing veins .
MINERAL - RESOURCE SURVEYS formation of granitic magma , provided water
- rich fluids that leached gold and other elements from the host rocks and then
deposited them in fractures that now form the gold - bearing veins .
Page 39
Evidence from structures preserved in the rocks indicates that this mixture of
diverse rock materials formed above an “ African ” subduction zone at which the
crustal plate that formed the floor of the ocean at that time was pushed beneath
the ...
Evidence from structures preserved in the rocks indicates that this mixture of
diverse rock materials formed above an “ African ” subduction zone at which the
crustal plate that formed the floor of the ocean at that time was pushed beneath
the ...
Page 59
As an example , studies of certain fossil groups found in rocks from one of these
terranes suggest that it was probably once attached to what is now Eurasia or
Indonesia . Measurement of the magnetic properties of rocks in many of the
terranes ...
As an example , studies of certain fossil groups found in rocks from one of these
terranes suggest that it was probably once attached to what is now Eurasia or
Indonesia . Measurement of the magnetic properties of rocks in many of the
terranes ...
Page 104
data to be evaluated include information on the following : • Distribution of rock
types considered to be potential host rocks . Surface outcrops of basalt , granitic
rocks , argillaceous rocks , tuff , salt , and anhydrite were mapped . In addition ...
data to be evaluated include information on the following : • Distribution of rock
types considered to be potential host rocks . Surface outcrops of basalt , granitic
rocks , argillaceous rocks , tuff , salt , and anhydrite were mapped . In addition ...
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activities addition Administration agencies Alaska analysis aquifer areas assessment Assistant associated basins Bldg Board Bureau California cartographic changes Chief City City of w coal collected Commission completed concentrations Conservation contaminants continued Control Cooperative County data base Department deposits distribution District District w Division earthquake energy Environmental eruption Federal feet Figure fiscal year 1984 flow geographic glacier ground water ground-water hazards hydrologic important increase International irrigation Lake land located major Management maps measured miles million mineral resources models National Center Natural needs North Office Operations organic Planning potential prepared present problems production Public quadrangle range record Regional reports River rocks scientific scientists selected Service showing sources stations STOP studies supplies surface techniques tion Transportation trends types U.S. Geological Survey understanding United waste Water Resources zone
Bibliographic information
| Title | United States Geological Survey Yearbook |
| Author | Geological Survey (U.S.) |
| Publisher | The Survey, 1985 |
| Original from | Indiana University |
| Digitized | 10 Dec 2012 |
| Export Citation | BiBTeX EndNote RefMan |