| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2013: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2011: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
|
|---|
| Research Abstract |
Recent studies highlighted the potential to determine the age of faulting by using K-Ar dating of clay minerals in fault zone. However, the challenge remains difficult due to the possibility of contamination by old K-bearing minerals of the host rock.
In order to establish a direct dating method for clay minerals in fault zone, precise clay separation combined with mineral characterization of fault gouge samples, and dating by unspiked K-Ar method was conducted. The finer fractions yield younger K-Ar ages, and contain larger amount of low-temperature type clay, suggesting enrichment in more recently grown clay minerals. Because K-Ar dating cannot detect no-potassium clay which formed <100 degree C, the ages mean the latest timing of faulting under >100 degree C temperature environment. Further fundamental studies about fault clay and requirements in dating are needed.
|
