1991 Fiscal Year Final Research Report Summary
Reconstruction of Inorganic Paleoenvironment From 20 Thousand Years Down to Recent Around Lake Nojiri, Nagano Prefecture
| Project/Area Number |
02302028
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| Research Category |
Grant-in-Aid for Co-operative Research (A)
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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 | Gunma University |
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Principal Investigator |
NOMURA Satoshi Gunma University Faculty of General Studies Professor, 教養部, 教授 (20008155)
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| Co-Investigator(Kenkyū-buntansha) |
SAKAI Jun'ichi Shinshu Univeristy Faculty of Science Professor, 理学部, 教授 (30020663)
KUMAI Hisao Osaka City Univeristy Faculty of Science Professor, 理学部, 教授 (40020680)
YOSHIKAWA Shusaku Osaka City Univeristy Faculty of Science Assistant Professor, 理学部, 助教授 (30047394)
AKAHANE Sadayuki Shinshu University Faculty of Education Assistant Professor, 教育学部, 助教授 (40089090)
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| Project Period (FY) |
1990 – 1991
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| Keywords | Uppermost Pleistocene / The coldest climate / Paleoenvironment / Eolian and hydrogenous beds / Nojiri-ko Excavation / Paleomagnetism of Upper Pleistocene |
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| Research Abstract |
(1) Several key beds of the uppermost Pliocene to Recent formations around Lake Nojiri were identified in both eolian and hydrogenous beds.
(2) Hills and lowland around Lake Nojiri show periodic arrangement. Along the boundary between hills and lowlands, there are three main faults, named Furumi, Arasehara and Rokugatu Faults respectively.
(3) Disturbances of uppermost Pleistocene beds were formed by the deposition of primary and secondary sedimentary materials.
(4) There is no reverse magnetized horizon from 20 thousand years down to Recent. But we can find the horizon in the beds of about 50 thousand years ago.
(5) The coldest climate is estimated within the uppermost part of the Upper Nojiri-ko Member III by pollen analysis.
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[Publications] Arita, yoko, Nakai, Nobuyuki, Nakamura, Toshio, Kamei, Tadao, Akiyama, Masahiko and Sawada, Ken: "Collagen extraction method from mammal fossils and radiocarbon dating with AMS technique." Bull. Nagoya Univ. Furukawa Museum. No. 6. 45-54 (1990)
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