2004 Fiscal Year Final Research Report Summary
Constraints on ancient ocean chemistry based on the geochemical study of 3.8 Ga Isua Supracrustal Rocks.
| Project/Area Number |
14403012
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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 | 海外学術 |
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| Research Field |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | Tohoku University |
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Principal Investigator |
KAKEGAWA Takeshi Tohoku University, Graduate School of Science, Associate Professor, 大学院・理学研究科, 助教授 (60250669)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAZAWA Hiromoto National Institute for Materials Science, Fellow, フェロー (80333780)
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| Project Period (FY) |
2002 – 2004
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| Keywords | Isua / Greenland / Early Earth / Ocean Chemistry / Geochemical Cycle of Phosphorous |
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| Research Abstract |
This scientific proposal has been approved in 2003. The main purpose is to conduct geological survey for the Isua area in Greenland. In this area, the oldest fragments of the, earth crust is found : they were formed at 3.8 Ga on the contemporary ocean floor. The main scientific goal is to constrain the ocean chemistry at 3.8 Ga through the geochemical studies of the Isua rocks. In addition, finding new evidence for the early life is also the subject. From 2003 to 2004, detailed field surveys were performed. Collected rocks were analyzed by several geochemical methods. New results to constrain the phosphorous and carbonate chemistry were obtained. New evidence for the earliest life was also discovered through the course of this study. These were very fruitful results and very important findings. Some results were already published on the scientific journals.
Studying modern analogue is additional subjects for this study. Submarine and terrestrial hot springs were chosen for this purpose. Some data obtained from the field was used for experiments to demonstrate the early earth environments in the laboratory.
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