Secular variation of marine Os isotopes reconstructed from Fe-Mn sediments in the Phanerozoic accretionary complexes

我们推进了我们的研究计划，以重建海洋Os同位素的长期变化，利用在日本增生杂岩的土矿床。据此，我们成功地重建了一条350 Ma以来海洋锇同位素的长期变化曲线。我们取得了以下成果：发表在《地球化学地球物理地球系统》（2005）上的论文《晚白垩世日本增生杂岩中金属矿物的主微量元素地球化学和Os同位素组成》。此外，我们还在《资源地质学特刊》上发表了三篇论文，内容涉及日本四国中部北方秩父带含金属岩和相关绿岩的地球化学及其沉积时代，题目是“泛海底的海底过程和相关矿化：日本增生杂岩中的古生代记录-第一部分”。我们提交了题为“日本第三纪增生杂岩中的琥珀：古海水中锇同位素组成的记录器”地球化学与宇宙化学学报，是地球科学研究领域的顶级期刊。此外，我们还向《自然》杂志提交了题为“27.6亿年前含氧地下水形成的赤铁矿”的论文。本文是关于Re-Os定年的研究。此外，我们还准备了另一篇论文，题为“白垩纪期间的海洋Os同位素记录：来自日本和阿曼增生复合体中金属矿的证据”，将提交给《地球和行星科学快报》。

We promoted our research program in order to reconstruct a secular variation of marine Os isotopes by using umber deposits in the Japanese accretionary complexes. Consequently, we are successful in reconstructing a secular variation curve of marine Os isotopes since 〜350 Ma. We have obtained the following results.We published the paper entitled "Major and trace element geochemistry and Os isotopic composition of metalliferous umbers from the Late Cretaceous Japanese accretionary complex" in Geochemistry Geophysics Geosystem (2005). In addition, we published three papers concerning geochemistry of metalliferous umbers and associated greenstones in the Northern Chichibu Belt, central Shikoku, Japan and their depositional age in Resource Geology Special Issue entitled "Seafloor Processes and Related Mineralization in the Panthalassa : The Phanerozoic Records from the Japanese Accretionary Complexes - Part I".We have submitted the paper entitled "Umbers in the Tertiary accretionary complex of Japan : A recorder of Os isotopic composition of ancient seawater" to Geochimica et Cosmochimica Acta that is the top journal of Earth science research field. Further, we have submitted the paper entitled "Haematite formation by oxygenated ground-water more than 2.76 billion years ago" to Nature. This paper is concerning about Re-Os dating. In addition, we prepare another paper entitled "Marine Os isotope record during the Cretaceous : Evidence from metalliferous umbers in the Japanese and Omani accretionary complexes" to be submitted to Earth and Planetary Science Letters.