2000 Fiscal Year Final Research Report Summary
Are there any fossil seismic zone in an accretionary complex ? -A thermochronologic study-
| Project/Area Number |
11640446
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geology
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| Research Institution | KANAZAWA UNIVERSITY |
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Principal Investigator |
HASEBE Noriko Dept.Earth Sci., Kanazawa Univ., Assistant Prof., 理学部, 助手 (60272944)
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| Co-Investigator(Kenkyū-buntansha) |
TAGAMI Takahiro Dept.Geol.Mi neral., Kyoto Univ., Associate Prof., 大学院・理学研究科, 助教授 (80202159)
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| Project Period (FY) |
1999 – 2000
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| Keywords | fission track method / Shimanto Belt / faults / accretionary complex / earthquake |
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| Research Abstract |
Accretionary prisms develop along subducted continental margins by the offscraping and underplating of the mixture of oceanic sediments and trench fill continental deposits. Because subduction zones, where accretionary prisms develop, is the area of large earthquakes at the depth of 10-30km, the thermal energy radiated by earthquakes could cause various geological events to surrounding accretionary complexes, as is detected by the fission track (FT) method from rocks around the active Nojima Fault, Awaji Island, central Japan.
The Shimanto accretionary complex in northeastern Kyusyu, southwest Japan, is divided into four units based on microfossiles and rock facies. The degree of heating by regional metamorphism is estimated for each units using fission track method and vitrinite reflectance. The thermal disturbance within Mikado formation, which exists south of the Nobeoka thrust, becomes higher from south to north according to FT ages and track-length distribution. The FT age of the sample collected from thrust gouge of the Nobeoka thrust fault shows higher thermal disturbance than that of hanging Kitagawa unit and the lower Mikado formation. The FT age, 31.2±5.7 Ma, may indicate the time of heating by the thrust fault activity. The time range between sedimentation and the obtained FT age is less than 5 million years. Provided the velocity and the angle of subduction to be 50 mm/yr and 13°, respectively, underthrusted sediments reach the depth, where plate-boundary earthquakes occur, within a few million years. Hence the obtained time of thrust activity may cause a large earthquake at the plate boundary. Other faults show no evidenceof heating in FT data. This means that the degree of heating may vary along the fault plane.
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