2006 Fiscal Year Final Research Report Summary
Plio-Pleisatocene environmental changes in Java and hominind evolution and dispersion
| Project/Area Number |
15403015
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Stratigraphy/Paleontology
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| Research Institution | Kobe University |
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Principal Investigator |
HYODO Masayuki Kobe University, Research Center for Inland Seas, Professor, 内海域環境教育研究センター, 教授 (60183919)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Hiroshi University of Hyogo, Institute of Natural and Environmental Sciences, Professor, 自然・環境研究所, 教授 (80254457)
MATSU'URA Shuji Ochanomizu University, Faculty of Human Life and Environmental Sciences, Professor, 生活科学部, 教授 (90141986)
KONDO Megumi Ochanomizu University, Faculty of Human Life and Environmental Sciences, Assistant Professor, 生活科学部, 助手 (40302997)
KUMAI Hisao Osaka City University, Graduate School of Science, Guest Professor, 大学院・理学研究科, 客員教授 (40020680)
YAMASHITA Katsuyuki Okayama University, Institute for Study of the earth's Deep Interior, Associate Professor, 地球物質科学研究センター, 助教授 (50322201)
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| Project Period (FY) |
2003 – 2006
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| Keywords | Paleoenvironment / Plio-Pleistocene / Java / Homo erectus / Environmental magnetism / Paleomagnetism / Quaternary |
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| Research Abstract |
Javan hominid fossils are important to study hominid dispersion, namely "Out-of-Africa" problem. However, their ages have not been established, and still disputed. In this study, we reconstructed paleoenvironmental changes from the Sangiran hominid fossil-bearing formation, central Java, and discuss the relationship between hominid dispersion and environment changes. In addition, a new paleomagnetic dating technique was studied, and tried to apply to the Javan paleomagnetic stratigraphy data. The following results were obtained:
(1) A technique of environmental magnetism was first applied to the black clay of the Pucangan (Sangiran) Formation in Sangiran, central Java. As a result, we found a large environmental change that occurred just above the T11 tuff horizon, coincided with the occurrence of the earliest Homo erectus fossil in Sangiran. We confirmed the method was valid to the sediments with less content of biological fossils like pollen or diatom, often used for paleoenvironmental study.
(2) Detailed paleoenvironmental study with pollen and diatom fossils is difficult because of poor content, except some parts of the Pucangan (Sangiran) Formation.
(3) The magnetostratrigraphy data in Sangiran show that the Upper Olduvai transition represents a number of geomagnetic fluctuations. The same field behavior was observed in the Chinese loess in Baoji, south-central China. Thus we confirmed that it is a real geomagnetic feature, and that the magnetostratigraphic correlation by Hyodo et al. (1992; 1993; 2002) is reasonable.
(4) We revealed millennial to submillennial-scale features for the Matuyama-Brunhes polarity transition using a 1700-m core from Osaka Bay. The features are utilized to confirm the magnetostratigraphic correlation in Sangiran.
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[Book] The age and geological background of Nacholapithecus, Samburupithecus and Orrorin tugenensis, Kenya, Human Origins and Environmental Backgrounds(Ishida, H., Tuttle, R.H., Pickford, M., Ogihara, N., Nakatsukasa, M. (eds))2006
Author(s)
Sawada, Y.
Publisher
Springer
Description
「研究成果報告書概要(和文)」より
