Basic Geology
How many major chrons were in the Quaternary?
2
Name features associated with strike slip faults
sag pond, shutter ridge, linear valley
shaplerite, willemite, and smithsonite are all
zinc ores
Sphalerite and Galena
What is an isopach?
a map with thicknesses of rocks beds related to the topography
In a rock composed of the following minerals: Amphibole, Biotite, Albite, Andesine, and Quartz, which will weather first?
A
what would you expect the sequence of the rock units from oldest to youngest for a transgressive sequence?
sandstone, shale, limestone
Where can ores of Cu, Pb, Zn, and Ag be found?
convergent, divergent, and transform tectonic plate boundaries
the best index fossils
are floating or swimming organisms because they are more likely to be preserved
What technique is best suited for investigating the ore bodies below gossan? Pick one:
Landsat, detailed mapping, or fanned borehole arrays
landstat - you can see the color variation on map
Surface exposure, in a temperate environment, of aluminum silicate (feldspar) will result in the development of which mineral?
A. Montmorillonite
B. Kaolinite
C. Biotite
Name some features associated with landslide activity
scarps, head, toe, hummocky terrain
In what type of environment would you expect to find gold, platnium, and titanium
placers
Porosity of a well sorted sand is 0.35 and the volume of the voids is 15in3. what is the void ratio?
0.54
e = n /1-n
You are tracking a contaminant plume and you want to monitor its movement. The material is permeable. what is the best and cheapest drilling method? and why?
a. CPT
B. Rotary wash
C. Hollow-stem auger
d. sonic
A CPT because this will be least likely to disturbed the plume and does not use drilling additives
What are the extrusive compositional equivalents of granite and granodiorite?
rhyolite and dacite
you have: a cross-bedded sandstone, a ripple marked sand stone, a claystone and siltstone in one strata, what was the environment?
a dune to lagoon
you have these minerals: bastnaesite, didymium, loparite, and monazite
what elements are you looking for?
REE
A distance drawdown curve on which the drawdown is plotted increasing downward has flattening of the curve at a distance from the pumped well. WHY?
The aquifer is 200 to 300 ft below surface. What kind of drilling should you use if you dont care about $$$?
A cable tool - can drill very low but very $$
Which hydrothermal mineral is indicative of formation at great depth and high temperature?
A. Ecologite
B. Garnet
C. Glaucophane
Garnet
Name features associated with normal faults
grabben, horst, fenster
What factors impact the economic feasbility for the mining of a coal bed?
Cost of mining, processing, labor, transportation, selling, taxes
Where would you expect LNAPL to spill in a well?
floating on the surface of the water table
Bentonite is formed from what ?
volcanic ash