Ce ANOMALIES OF ISLAND ARC IGNEOUS ROCKS

2000 Fiscal Year Final Research Report Summary

• Project/Area Number: 11640472
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Petrology/Mineralogy/Science of ore deposit
• Research Institution: TOHOKU UNIVERSITY
• Principal Investigator: FUJIMAKI Hirokazu GRADUATE SCHOOL OF SCIENCE, TOHOKU UNIVERSITY, PROFESSOR, 大学院・理学研究科, 教授 (90133933)
• Co-Investigator(Kenkyū-buntansha): OHBA Tsukasa GRADUATE SCHOOL OF SCIENCE, TOHOKU UNIVERSITY, RESEARCH ASSISTANT, 大学院・理学研究科, 助手 (10272014) ; ISHIKAWA Ken-ichi GRADUATE SCHOOL OF SCIENCE, TOHOKU UNIVERSITY, RESEARCH ASSISTANT, 大学院・理学研究科, 助手 (20158744) ; YOSHIDA Takeyoshi GRADUATE SCHOOL OF SCIENCE, TOHOKU UNIVERSITY, PROFESSOR, 大学院・理学研究科, 教授 (80004505)
• Project Period (FY): 1999 – 2000
• Keywords: RARE EARTH ELEMENT / Ce ANAMALY / ISLAND ARC VOLCANICS

Research Abstract

A number of igneous rocks from Kuzuryu and Hakusan volcanic zones, anf Ogasawara islands have been analyzed for rare earth elements by ICP-MS, Some plutonic rocks from central Mongolia have been analyzed as well. Only some volcanic rocks from the Ogasawara islands show negative Ce anamalies. Almost all of them are rather poor in light rare earth elements. In contrast, none of the volcanic rocks from Kuzuryu and Hakusan volcanic zones show Ce anomaly. All of the rocks from the two volcanic zones are highly enriched in light rare earth elements. It seems that there appears no volanic rock with netative Ce anomaly in the matured island arc. The mongolian plutonic rocks show slight but clear Ce anomaly : this may imply that the parental crustal material of the plutonic rocks could be pre-matured island arc material.

Research Products

• [Publications] Fojimaki et al.,: "Geochemistry of Hannouba basalts, Wanquan County, Zhanjiakou district, Hebei, northern China"Northeast Asian Studies. 4. 231-245 (2000)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] Fujimaki & Jargalan: "Geology and Petrology of granitic Pluton, Tsagaan Tsahir Uul, Central Mongolia"Northeast Asian Studies. 4. 213-230 (2000)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] Fujimaki et al.,: "Mautle evolution beneath the eastrn Baikal region, Rassia"Northeast Asian Studies. 4. 145-172 (2000)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] Ohtani, A., Miyamoto, T., Ohba, T., Fujimaki, H., and Liu, J.: "Geochemistry of Hannouba basalts, Wanquan county, Zhanjiakou district, Hebei, northern China"Northeast Asian Studies. Vol.4. 231-245 (2000)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] Jargalan, S.and Fujimaki, H.: "Geology and Petrology of granitic pluton, Tsagaan Tsahir Uul, central Mongolia"Northeast Asian Studies. Vol.4. 213-230 (2000)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] Litasov, K., Litasov.Y, Fujimaki, H., Miyamoto, T., Taniguchi, H.: "Mantleevolution the eastern Baikal region, Russia"Northeast Asian Studies. Vol.4. 145-172 (2000)
  • Description: 「研究成果報告書概要(欧文)」より