1990 Fiscal Year Final Research Report Summary
Global Chronology on the Pleistocene Climatic Changes by an International Collaboration of Japan, Switzerland, Austrea, New Zeeland on the basis of Lake
| Project/Area Number |
01044069
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Joint Research |
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| Research Institution | Beppu Geophysical Research Laboratory |
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Principal Investigator |
TEKEMURA Keiji Beppu Geophysical Research Laboratory, 理学部, 助教授 (00201608)
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| Co-Investigator(Kenkyū-buntansha) |
COLHOUN Eric Department of Geography, University New Castle, 教授
SPEDEN Ian New Zealand, Geological Survey, 所長
HEUBERGER Helmut Institut for Geographie, University Salzburg, 教授
SCHLUCHTER Christian Institut fur Ingenieurgeologie, ETH. Zurich, 準教授
OGURA Kazuko Department of Chemistry. Tokyo Metropolitan University, 理学部・化学教室, 助手 (20087117)
ISHIWATARI Ryoshi Department of Chemistry, Tokyo Metropolitan University, 理学部・化学教室, 教授 (90087106)
HORIE Shoji Emeritus Professor, Kyoto University, 理学部, 名誉教授 (90025320)
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| Project Period (FY) |
1989 – 1990
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| Keywords | Lake biwa core, / International standard / Climatic change / Global chronology |
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| Research Abstract |
1. Programm Carried Out
The purpose of our joint work is the establishment of global pleistocene chronology by the study of core sample which was obtained in the limnetic environment. We worked with various countries' scientists such as in New Zealand, Austria, Switzerland and Japan.
In New Zealand, we obtained core in Lake Waikare in which the deepest layer was dated as late pleistocene age. In Tasmania, Australia, we obtained 60 m long core of middle and late pleistocene so far as we estimate the age on the basis of paleomagnetic evidence. At Thalgut, outside of Bern, Switzerland, finally, core of 150 m long was got which covers the middle and late pleistocene in age. In connection with these core sample outside Japan, new glacial geologie study in which decisive data on the pleistocene climatic changes is shown, was carried out in Central Japanese high mountains.
2. RESULT
1) New Zealand (attached data (1)-(7)). As shown in age determination data, core covers New Zealand late Pleistocen
… More
e and Holocene. Composition of core and paleomagnetic data is unique one. Although diatom fussils show no significant variation, past temperature indicated in isotope study (indicated asw) is valuable denoting the basis of correlation with New Zealand and Japanese Paleotemparature.
2) Australia (attached data (8) and also (7)). In this closed lake, variation of diatom composition indicates the fluctuation of Precipitation which is important data for the study of past climate and glacial history. Osillation of past temperature is also shown in isotope analysis data of 7 (indicated as A)
3) Switzerland (attached data (9)-(15)). In this long core, we are working on Paleomagnetism, Pollen Analysis, oxygen and carbon isotope. All items of them are basic data on Paleoenvironment for which well examined data was already demonstrated in Lake Biwa 1,400 m core. Probably, the deepest layer on core was deposited just after the Brunhes -Mat uyama geomagnetic boundary.
4) Japan (attached data (16)-(17)). We had carried out elaborate glacial work at Hakuba and Tate-yama area. That district is classic place for the glacial geologic study since the last century. Distinguished new discovery is the limit of extension of past glaciers denoting that an altitude of past glacier was 600-800 m above see level. It is already published on Hidaka Mountains in our paper stressing the existence of low altitude pleistocene glacier in Japan. Present fact supports our previous discussion and emphasize the importance of the continuous work in the future. Less
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Research Products
(7 results)
