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Basic Study of Paleoceanographic Reconstruction by Marine Ferro-manganese Crusts.

海洋铁锰结壳古海洋重建的基础研究。

基本信息

批准号：
15540443
负责人：
USUI Akira
金额：
$ 2.24万
依托单位：
Kochi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

Marine ferromanganese oxide precipitates covering the rock outcrops are regarded as a possible long-range paleoceanographic indicator, as well as future mineral resources, but little study has been done based on fine-scale dating and physical and chemical description. We attempted the microstratigrahic description of hydrogenetic ferromanganese crusts dispersed over the western Pacific ocean floors. We found fairly good correlation of the microstratigraphy of some crusts remotely located each other, which indicates the lateral wide influence of bottom and intermediate waters through the geologic time. By contrast, the stratigraphy is much different in the crusts between the close locations at different depths.The fine-scale age dating of ferromanganese crusts is one of the most important marine geological science fields. We compared fine the paleomagnetic reversal patterns and Berilium-10 radiochemical dating and possible coincidence, which is proved to be another reliable tool for dating. We are ready to analyze the finely polished crusts using the Super-conductor magnetometer (SQUID) to determine the exact point of magnetic reversal at 780000yr (planned at CALTEC on June 2005). Furthermore, we examined the thermal demagnetization process of the hydrogentic crusts and obtained important information about the carrier mineral of the magnetism of the crusts.In future, we continue to study this topic to ensure the reliability of magnetic stratigraphy and reconstruction of past oceanographic and geological environments.

覆盖在岩石露头上的海洋铁锰氧化物沉淀物被认为是一种可能的长期古海洋学指示物，以及未来的矿产资源，但很少有基于精细尺度定年和物理化学描述的研究。我们试图对分布在西太平洋洋底的水成铁锰结壳进行微地层学描述。我们发现，一些彼此相距较远的结壳的微地层具有相当好的对比性，这表明在整个地质时期，底层水和中层沃茨的横向影响很大。铁锰结壳的精细定年是海洋地质科学的重要研究领域之一。对古地磁反转模式与铍-10放化测年及可能的重合进行了比较，证明铍-10放化测年是另一种可靠的测年工具。我们准备使用超导磁力仪（SQUID）分析精细抛光的结壳，以确定780000年（计划于2005年6月在CALTEC）的磁反转的确切点。此外，我们还研究了水成壳的热退磁过程，获得了有关水成壳磁性载体矿物的重要信息，今后将继续开展这一课题的研究，以确保磁性地层学的可靠性和过去海洋地质环境的重建。