Constraints on ancient ocean chemistry based on the geochemical study of 3.8 Ga Isua Supracrustal Rocks.

这一科学建议已于2003年获得批准。主要目的是对格陵兰岛的伊苏亚地区进行地质调查。在这个地区，发现了最古老的地壳碎片：它们形成于3.8千年前的现代海底。主要的科学目标是通过对Isua岩石的地球化学研究来限制3.8 Ga的海洋化学。此外，寻找早期生命的新证据也是主题。从2003年到2004年，进行了详细的实地调查。收集的岩石用几种地球化学方法进行了分析。得到了约束磷和碳酸盐化学的新结果。研究过程中还发现了最早生命的新证据。这些都是非常富有成果和非常重要的发现。一些研究结果已经发表在科学期刊上。研究现代模拟物是本研究的附加主题。为此，选择了海底和陆地温泉。从野外获得的一些数据被用于实验室的实验，以证明早期的地球环境。

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.