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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.

覆盖岩石露头的海洋氧化铁锰沉淀物被认为是一种可能的远程古海洋学标志，也被认为是未来的矿产资源，但基于精细测年和物理化学描述的研究很少。我们尝试对西太平洋洋底散布的水成铁锰结壳进行微地层学描述。发现相距较远的几个结壳的微地层具有较好的相关性，表明底水和中水在整个地质时期具有横向宽广的影响。相比之下，不同深度附近结壳的地层差异很大。铁锰结壳的精细年龄测定是海洋地质科学中最重要的领域之一。我们将古地磁反转模式与铍-10放射化学测年结果进行了精细的对比，证明这是另一种可靠的测年工具。我们已经准备好使用超导磁力仪(SQUID)分析精细抛光的结壳，以确定78000年的磁反转点(计划于2005年6月在CALTEC)。此外，我们还研究了成水结壳的热退磁过程，获得了有关结壳磁性载体矿物的重要信息，今后我们将继续研究这一课题，以确保磁性地层学和过去海洋地质环境重建的可靠性。