"Proto-Japanese Islands" estimated by detrital minerals in Cretaceous sediments

根据白垩纪沉积物中的碎屑矿物推测“原始日本群岛”

• 批准号: 21740366
• 负责人: TSUTSUMI Yukiyasu
• 金额: $ 1.75万
• 依托单位: National Museum of Nature and Science,Tokyo (2011)National Museum of Nature and Science, Tokyo (2009-2010)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21740366/
• 关键词: 地球史; 日本列島形成; 砂岩; モナザイト; ジルコン; 年代測定; 堆積年代; 後背地

The geologic belts in the Japanese Islands were rearranged by movement of Japan Sea formation in middle Cenozoic. I have conduced dating of monazite and zircon for Cretaceous shallow- and non- marine sediments and basement rocks. I succeeded to decide the precision sedimentary age of the Sasayama Group. In addition, detrital monazites from the Himenoura Group indicated a possibility that Cretaceous granitoids were scarce in the provenance of the group. Exploration of Cretaceous accretionary complex is conducted in the Tenryu area of the Sanbagawa Belt. Although the area was thought to be the contact of the "Sanbagawa meta-AC sensu stricto" and the "Shimanto meta-AC", the result of my study clearly indicate that both of the unit in the area originate from Late Cretaceous accretionary complexes.

中新生代日本海组的运动使日本列岛的地质带重新排列。对白垩纪浅海、非海相沉积物和基底岩石进行了独居石和锆石测年.我成功地确定了佐山群的精确沉积时代。此外，从Himenoura群的碎屑独居石表明，白垩纪花岗岩类是在该组的物源稀缺的可能性。白垩纪增生杂岩的勘探在三八川带的天龙地区进行。虽然该地区被认为是“严格意义上的三八川变质AC”和“四万十变质AC”的接触，但我的研究结果清楚地表明，该地区的两个单元都起源于晚白垩世增生杂岩。

项目成果

Microstructurally controlled monazite chronology of ultrahigh-temperature granulites from southern India: implications for the timing of Gondwana assembly

印度南部超高温麻粒岩的微观结构控制独居石年代学：对冈瓦纳古陆组装时间的影响

• 发表时间: 2008
• 期刊: Island Arc (印刷中)
• 作者: Santosh;M.;Tsunogae;T.;Tsutsumi;Y.;and Iwamura;M.
• 通讯作者: M.