| Project/Area Number |
13440151
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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 | 一般 |
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| Research Field |
Geology
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| Research Institution | NATIONAL INSTIUTE OF POLAR R PARCH |
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Principal Investigator |
SHIRAISHI Kazuyuki NATIONAL INSTITUTE OF POLAR RESERCH, DIVISION FOR RESEARCH AND EDUCATION, PROFESSOR, 研究教育系, 教授 (90132711)
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| Co-Investigator(Kenkyū-buntansha) |
MOTOYOSHI Yoichi NATIONAL INSTIUTE OF POLAR R PARCH, DIVISION FOR RISEARCH AND EDUCATION, PROFESSOR, 研究教育系, 教授 (90211606)
MISAWA Keiji NATIONAL INSTIUTE OF POLAR R PARCH, DIVISION FOR RISEARCH AND EDUCATION, ASSOCIATE PROFESSOR, 研究教育系, 助教授 (70212230)
OWADA Masaaki YAMAGUCHI UNIVERSITY FACULTY OF SCIFNCE, ASSOCIATE PROFESSOR, 理学部, 助教授 (50213905)
OSANAI Yasuhito KYUSHU UNIVERSITY, GRADUATE SCHOOL OF SOCIAL AND CULTURAL STUDIES., PROFESSOR, 大学院・比較社会文化研究院, 教授 (80183771)
HOKADA Tomokazu NATIONAL INSTIUTE OF POLAR R PARCH, DIVISION FOR RESEARCH AND EDUCATION, RESEARCH ASSOCIATE, 研究教育系, 助手 (60370095)
山口 亮 国立極地研究所, 南極隕石研究センター, 助手 (70321560)
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| Project Period (FY) |
2001 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥8,400,000 (Direct Cost: ¥8,400,000)
Fiscal Year 2004: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2003: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 2002: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 2001: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Keywords | Gondwana / East Antarctica / SHRIMP / U-Pb age / Pan-African / Tectonic model / Napier Complex / Continental crust / ジルコン / 年代測定 / 地球年代学的標準試料 / U-Pb / Mn-Cr法 / アフリカ / CHIME / ダルース岩体 / 大陸地穀 |
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| Research Abstract |
The Dronning Maud Land, which is the Indian sector of the East Antarctica is referred as the southern extension of the Pan-African Mozambique mobile belt, and is one of the best fields to elucidate the evolution of the Gondwana continental crust. The aim of this study is to reconstruct the tectonic model of the Gondwana using the meamorphic P-T paths combined with precise age data by SHRIMP. The major results are:
1) The Napier Complex consists of crustal fragments formed during 3.8-2.6 Ga, and the last orogeny was terminated in 2.52-2.46 Ga with the ultra-high temperature metamorphism.
2) Re-examination of the metamorphic and protolith ages of the Lutzow Holm Complex elucidated that the pre-Gondwana history is totally different from those in the Sor Rondane Mountans. Moreover, in the Sor Rondane Mts., two stages of the Pan-African events are recognized. These facts give the constraints far the tectonic history of the Gondwana
3) In the central Droning Maud Land, it is suggested that the inland mountain area and the Schirmacher Hill belong different tectonic units by comparison of modes of metamorphism, plutorism and preliminary SHRIMP ages.
4) The SHRIMP age dating for the late Grenvillian A-type granite bodies sporadically occurring in the Natal Belt of South Africa revealed the time-space transition of the igneous activity.
5) Studies on the continental crust of many areas from the world were performed as collaboration work using SHRIMP It Itsaq Complex in SW Greenland, the Harris Complex in NW Scotland, western Himalaya, the Kontum massif in Vietnam and Hidaka Belt and Kofu basin in Japan.
6) As a part of the study of the development and maintenance of the SHRIMP II at the National Institute of Polar Research, standardization of the U-Pb and Mn-Cr methods, and measurement of REE were performed. In addition zircon standard samples from Duluth Complex was prepared. New zircon standards were evaluated with the conventional U-Pb-Th isotope measurement.
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