Petrography, age, and paleomagnetism of basaltic lava flows in coreholes at Test Area North (TAN), Idaho National Engineering Laboratory
- Geological Survey, Menlo Park, CA (United States). Branch of Isotope Geology
- Geological Survey, Denver, CO (United States). Branch of Central Regional Geology
The petrography, age, and paleomagnetism were determined on basalt from 21 lava flows comprising about 1,700 feet of core from two coreholes (TAN CH No. 1 and TAN CH No. 2) in the Test Area North (TAN) area of the Idaho National Engineering Laboratory (INEL). Paleomagnetic studies were made on two additional cores from shallow coreholes in the TAN area. K-Ar ages and paleomagnetism also were determined on nearby surface outcrops of Circular Butte. Paleomagnetic measurements were made on 416 samples from four coreholes and on a single site in surface lava flows of Circular Butte. K-Ar ages were measured on 9 basalt samples from TAN CH No. 1 and TAN CH No. 2 and one sample from Circular Butte. K-Ar ages ranged from 1.044 Ma to 2.56 Ma. All of the samples have reversed magnetic polarity and were erupted during the Matuyama Reversed Polarity Epoch. The purpose of investigations was to develop a three-dimensional stratigraphic framework for geologic and hydrologic studies including potential volcanic hazards to facilities at the INEL and movement of radionuclides in the Snake River Plain aquifer.
- Research Organization:
- US Geological Survey, Denver, CO (United States)
- Sponsoring Organization:
- Department of the Interior, Washington, DC (United States)
- OSTI ID:
- 206485
- Report Number(s):
- USGS/OFR-94-686; ON: DE96003486; NC: NONE; TRN: 96:009190
- Resource Relation:
- Other Information: PBD: [1994]
- Country of Publication:
- United States
- Language:
- English
Similar Records
Geology, K-Ar geochronology and paleomagnetism of parts of the coastal cordillera of central Chile, South America
K--Ar dating, geological and paleomagnetic study of a 5-KM lava succession in northern Iceland