2010 Fiscal Year Final Research Report
Determination of the history of fault activity using pseudotachylyte from the Median Tectonic Line and from the Atotsugawa Fault
| Project/Area Number |
20540449
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Geology
|
|---|
| Research Institution | Waseda University |
|---|
Principal Investigator |
TAKAGI Hideo Waseda University, 教育・総合科学学術院, 教授 (60154754)
|
|---|
| Project Period (FY) |
2008 – 2010
|
| Keywords | 地質学 / テクトニクス / 岩石・鉱物・鉱床 |
|---|
| Research Abstract |
Fission-Track (FT) ages for zircon in granitic rocks along the MTL and Atotsugawa Fault were determined. The FT ages for the MTL yield about 60 Ma, suggesting the oldest brittle deformation along the MTL, whereas those for the Atotsugawa Fault yields two bimodal ages ; 60+Ma and about 45Ma, even though the protolith age is Jurassic. The older age suggests the rejuvenation of concealed younger granitoid and younger age suggest the formation of the PT. On the basis of these data and previous ages of fault gouges, major faults in granitic crust of SW Japan were probably initiated from early Paleogene.
|
