1993 Fiscal Year Final Research Report Summary
Mechanism of formation of Cretaceous to Paleogene cauldron in Chugoku district, Japan
| Project/Area Number |
04640706
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
地質学一般
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| Research Institution | Yamaguchi University |
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Principal Investigator |
IMAOKA Teruyoshi Faculty of Liberal Arts, Yamaguchi University, Associate Professor, 教養部, 助教授 (30193668)
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| Co-Investigator(Kenkyū-buntansha) |
KOMURO Hiroaki Faculty of Science Shimane University, Associate Professor, 理学部, 助教授 (80135897)
TAKEDA Kenji Faculty of Education, Yamaguchi University, Associate Professor, 教育学部, 助教授 (50155008)
MISHIMURA Yujiro Faculty of Liberal Arts, Yamaguchi University, Professor, 教養部, 教授 (20034712)
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| Project Period (FY) |
1992 – 1993
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| Keywords | Cldera / Cauldron / Magma / Cretaceous / Paleogene / Igneous rock / Dyke / Japan |
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| Research Abstract |
Cretaceous to Paleogene volcanic rocks and granitic batholiths are extensively distributed in the Inner zone of Southwest Japan. This project includes structural geology, petrology, geochemistry on the Cretaceous to Paleogene cauldrons in the Chugoku district, Southwest Japan. The scale model experiments were also carried out in order to simulate the formation process of the cauldron.
From these studies, we found new caulderons, i.e., Niimi caldron and Yamaguchi cauldron in the Niimi area, Okayama Prefecture and Yamaguchi city ; respectively. These cauldrons show volcano-plutonic complexes. From the scale model experiments under centrifuge acceleration, it is inferred that the fracturing of the polygonal cauldron is influenced by the pre-existed basement structures such as faults.
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