Page 28 - Geologic Investigations in the Lake Valley Area, Sierra County, New Mexico
P. 28
Contents
Abstract ......................................................................................................................................... 21Ä Introduction ................................................................................................................................... 21Ä Observations on Aeromagnetic and Gravity Anomalies ........................................................ 21Ä
Aeromagnetic Anomaly Data........................................................................................... 21Ä Gravity Data ........................................................................................................................ 22Ä Gravity Models ................................................................................................................... 22Ä Discussion ........................................................................................................................... 23Ä
Description of Lake Valley Fault from Geoelectric Measurements ..................................... 25Ä Introduction......................................................................................................................... 25Ä Results ................................................................................................................................. 29Ä
Cross Section South of Lake Valley....................................................................... 29Ä Apparent Dip of Resistivity Units............................................................................ 31Ä Cross Section North of Town Mountain ............................................................... 32Ä
Discussion ........................................................................................................................... 33Ä
Figures
1. Total-intensity aeromagnetic anomaly map reduced to pole ............................... 22Ä
2. Residual total-intensity aeromagnetic anomaly map ............................................. 23Ä
3. Complete Bouguer gravity anomaly map.................................................................. 24Ä
4–6. Diagrams of gravity models, across Lake Valley area, derived from crustal sections:
4. Model derived from section A–A′ ...................................................................... 25Ä
5. Model derived from section B–B′ ...................................................................... 26Ä
6. Model derived from section C–C′ ...................................................................... 27Ä
7. Map of AMT observation sites ................................................................................... 28Ä 8–10. Diagrams of resistivity models:Ä
8. Line 100 ................................................................................................................... 29Ä
9. Line 300 ................................................................................................................... 31Ä
10. Line 200 ................................................................................................................... 32Ä
Tables
1. Resistivity ranges of geologic materials in the southwest U.S. ...................................... 26Ä 2. Generalized sequence of chief lithologic units in vicinity of Lake Valley miningÄ
district, shown with typical thickness and relative resistivity ......................................... 27Ä
Note: Combined references list begins on page 76.
