Evolution of Gondwana and its bearing on mantle dynamics : Comparative study on Proterozoic erogenic belts in southern Africa, India, and Antarctica.

2001-2004年期间，在印度、马达加斯加、斯里兰卡、越南、巴基斯坦、澳大利亚、南非、刚果、纳米比亚、莫桑比克等地进行了地质野外工作。来自日本各研究所的约20名科学家和来自各国的28名科学家参与了这一方案。此外，约有15名来自大学的研究生参加了实地工作，作为他们的硕士或博士学位的一部分。问题研究本研究以元古宙碰撞带为研究对象，考察了地质构造和变质岩变形特征，在野外工作中采集了大量岩石样品进行岩石学、地球化学和同位素研究。我们确定了这些岩石的Sr和Nd同位素组成，以确定变质和原岩年龄。我们还应用CHIME和SHRIMP测年方法研究了冈瓦纳大陆的演化历史。通过岩石学研究，评价了变质作用的P-T条件，了解了上地幔和下陆壳的热通量。通过广泛的地球化学分析，研究了冈瓦纳大陆拼合与分散过程中地幔向下地壳的物质通量。地质野外工作是与各种研究机构共同合作进行的，包括印度阿拉哈巴德大学、马达加斯加塔那那利佛大学、斯里兰卡地质调查局、越南地质调查局、南非地质调查局、纳米比亚地质调查局、巴基斯坦地质调查局。2004年11月13 - 15日，在日本高知大学举行的冈瓦纳大陆演化与扩散国际研讨会上发表了研究成果。出版物列表见下页。

Geological filed works were conducted by the head investigator together with many scientists in several Gondwana fragments including India, Madagascar, Sri Lanka, Vietnam, Pakistan, Australia, South Africa, R.D.Congo, Namibia, Mozambique during the term (2001-2004) of this research program. About 20 scientists from various research institutes in Japan and 28 scientists from various countries were involved in this program. In addition, about 15 graduate students from universities participated in the field works as a part of their Ms or Ph.D. studies. In this research program, we focused mainly on Proterozoic collisional belts and examined geological structure and deformation features of metamorphic rocks.During field works, we collected wide ranges of rock samples for petrological, geochemical and isotopic studies. We determined Sr-and Nd-isotopic compositions of these rocks to identify metamorphic and protolith ages. We also applied CHIME and SHRIMP dating methods to understand evolution history of Gondwana. Petrological examinations were made to evaluate metamorphic P-T conditions and understand heat flux in upper mantle and lower continental crust. Extensive geochemical analyses were made to understand mass flux from mantle to lower crust during amalgamation and dispersal of Gondwana continent. The geological field works were carried out in mutual association with various research institutes including University of Allahabad, India, University of Antananarivo, Madagascar, Geological Survey of Sri Lanka, Geological Survey of Vietnam, Geological Survey of South Africa, Geological Survey of Namibia, Geological Survey of Pakistan. Research results were presented at the International Symposium on Gondwana Evolution and Dispersal held at Kochi University, Japan during Nov.13-15,2004. Publication list is given in the following page.