2005 Fiscal Year Final Research Report Summary
The Neogene history of environmental change in the Kenya Rift : Contribution to deciphering of evolution from ape to early hominid
| Project/Area Number |
14253006
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Geology
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| Research Institution | Shimane University |
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Principal Investigator |
SAWADA Yoshihiro Shimane University, Dept.of Geoscience, Professor, 総合理工学部, 教授 (80196328)
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| Co-Investigator(Kenkyū-buntansha) |
SAKAI Tetsuya Shimane University, Dept.of Geosci., Associate Professor, 総合理工学部, 助教授 (90303809)
ITAYA Tetsumaru Okayama Univ.of Sci., Res.Inst.of Natural Sci., Professor, 自然科学研究所, 教授 (60148682)
HYUDO Masayuki Kobe Univ., Research Center for Inland Seas, Professor, 内海域環境教育研究センター, 教授 (60183919)
NAKAYA Hideo Kagawa Univ., Dept.of Earth & Environ.Sci., Professor, 工学部, 教授 (20180424)
TANAKA Satoshi Kyoto University of Education, Associate Professor, 教育学部, 助教授 (00252536)
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| Project Period (FY) |
2002 – 2005
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| Keywords | Human evolution / East Africa / Miocene / Geology / Radiometric age / Magnetostratigraphy / Palaeontrogy / Earth environment |
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| Research Abstract |
The research results of the project are summarized as follows ;
(1)On the basis of K-Ar ages and magnetostratigraphy, the Lukeino Formation (Fm) which yielded the earliest hominid Orrorin tugenensis accumulated between 6.0Ma and 5.7Ma.
(2)The anorthoclase K-Ar ages from tuff layer yielding Nacholapithecus are 16.36±0.37Ma to 15.27±0.47Ma. Combined K-Ar ages and magnetostratigraphy of the Aka Aiteputh and Namurungule Fms in Samburu Hills, indicates that the hominoid fossil Sambrupithecus kiptalami occurs in the normal polarity zone, which is correlated with C4Ar.2n (ca.9.6Ma).
Drastic environmental change occurred around 10Ma between the Aka Aiteputh Fm phase and subsequent Namurungure Fm phase which is sharply recorded in the sediment succession.
(3)The age of lahar deposit layer yielding Kenyapithecus in the Fort Ternan area was dated 13.7 Ma based on the anorthoclase K-Ar and ^<40>Ar-^<39>Ar ages from phonolite lavas which sandwiched the fossil layer.
(4)Earliest Late Miocene hominoid, which is very important for understanding on the evolution from great ape to human, and mammalian fossils were discovered from the lahar deposits of the Nakali Fm. The Nakali Fm consists mainly of lake and fluvial deposits with tuff and lapilli tuff beds including volcanic mud flow and pyroclastic flow deposits. Combined with the ^<40>Ar-^<39>Ar ages and magnetostratigrapy, the age of the Nakali Fm ranges from 10.1Ma to 9.8Ma (within Chron C5n.2n to C5n.1n).
(5)Research of middle Miocene trachyte-phonolite flood volcanism in the whole Kenya rift ; geology, K-Ar age determination with magnetostratigraphy, petrography and geochemical characteristics.
(6)Comparative geochemical studies on modern lacustrine sediments from the five lakes in the Kenya rift, and sedimentary rocks 16 to 5Ma.
(7)Publications to journals and book (20 papers). The symposium was held at the annual meeting of Geological Society of Japan.
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Research Products
(40 results)
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[Journal Article] Refinement of the age of the Middle Miocene Fort Teman Beds,westem Kenya,and its implications for Old World biochronology2006
Author(s)
Pickford, M., Sawada, Y., Tayama, R., Matsuda, Y., Itaya, T., Hyodo, H., Senut,B.
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Journal Title
Comtes Rendus Geoscience (in press)
Description
「研究成果報告書概要(和文)」より
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[Journal Article] The age and geological background of Nacholapithecus, Samburupithecus and Orrorin tugenensis, Kenya.2006
Author(s)
Sawada, Y, Sakai, T., Itaya, T., Hyodo, M.et al.
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Journal Title
Human Origins and Environmental Backgrounds (eds.Ishida, H.et al.)(Springer)
Pages: 71-96
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Maxillae and associated gnathodental specimens of Nacholapithecus kerioi,a large-bodied hominoid from Nachola,northem Kenya2004
Author(s)
Kunimatsu, Y., Ishida, H., Nakatsukasa, M., Nakano, Y., Sawada, Y., Nakayama,K.
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Journal Title
Jour.Human Evol 46
Pages: 365-400
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Age and systematic status of the Chiang Muan(Thailand)hominoids2004
Author(s)
Pickford M., Nakaya, H., Kunimatsu, Y., Saegusa, H., Fukuchi, A., Ratanasthien,B.
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Journal Title
Comtes Rendus Geoscience 3
Pages: 65-75
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Maxillae and associated gnathodental specimens of Nacholapithecus kerioi, a large-bodied hominoid from Nachola, northern Kenya.2004
Author(s)
Kunimatsu, Y., Ishida, H., Nakatsukasa, M., Nakano, Y., Sawada, Y., Nakayama, K.
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Journal Title
Jour.Human Evol. 46
Pages: 365-400
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Age and systematic status of the Chiang Muan (Thailand) hominoids.2004
Author(s)
Pickford M., Nakaya, H., Kunimatsu, Y., Saegusa, H., Fukuchi, A., Ratanasthien, B.
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Journal Title
Comptes Rendus Palevol. 3
Pages: 65-75
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Deciphering the history of environmental change related to human evolution in the Kenya Rift.2003
Author(s)
Sawada, Y., Sakai, T., Itaya, T., Hyodo, M., Nakaya, H., Nakatsukasa, M., Kunimatsu, Y.et al.
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Journal Title
Geoscience Report, Shimane University 22
Pages: 1-14
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] The age of Orrorin tugenensis, an early hominid from the Tugen Hills, Kenya2002
Author(s)
Sawada, Y., Pickford, M., Senut, B., Itaya, T., Hyodo, M.他4名
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Journal Title
Comptes Rendus Palevol 1
Pages: 293-303
Description
「研究成果報告書概要(和文)」より
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[Journal Article] The age of Orrorin tugenensis, an early hominid from the Tugen Hills, Kenya.2002
Author(s)
Sawada, Y., Pickford, M., Senut, B., Itaya, T., Hyodo, M.et al.
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Journal Title
Comptes Rendus Palevol. 1
Pages: 293-303
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Refinement of the age of the Middle Miocene Fort Teman Beds, western Kenya, and its implications for Old World biochronology.
Author(s)
Pickford, M., Sawada, Y., Tayama, R., Matsuda, Y, Itaya, T., Hyodo, H., Senut, B.
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Journal Title
Comptes Rendus Geoscience (in press)
Description
「研究成果報告書概要(欧文)」より
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[Book] The age and geological background of Nacholapithecus, Samburupithecus and Orrorin tugenensis,Kenya.in"Human Origins and Environmental Backgrounds,(eds.Ishida,H.etal.)"2006
Author(s)
Sawada, Y, Sakai, T., Itaya, T., Hyodo, M.(他8名)
Total Pages
281(71-96)
Publisher
Springer
Description
「研究成果報告書概要(和文)」より
