The change in redox condition of the Japan Sea since its birth based on trace element geochemistry of sediment cores and sulfur isotope ratio of framboidal pyrite.

基于沉积物岩心微量元素地球化学和草莓状黄铁矿硫同位素比的日本海自诞生以来氧化还原条件的变化。

基本信息

批准号：
03640492
负责人：
MASUZAWA Toshiyuki
金额：
$ 1.28万
依托单位：
Institute for Hydrospheric-Atmospheric Sciences, Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

Framboidal pyrite spherules were isolated from high sulfur layrs of a piston core (KH77-3-L4') sample collected from the Japan Basin of the Japan Sea and sulfur isotope ratios of the pyrite-sulfur was measured. The sulfur isotope ratios show as low as-50* indicating the syngenetic formation of framboidal pyrite under euxinic bottom waters and its validity to distinguish the formation of framboidal pyrite under euxinic bottom waters and its validity to distingnish the formation of framboidal pyrite between syngenetic formation under euxinic bottom waters and diagenetic formation through diagenetic sulfate reduction. The C-14 ages of organic carbon were measured at high organic carbon layrs of the core by accelerator mass spectrometry. Twenty seven major and trace element contents were also measured for the core by neutron activation analysis in addition to organic carbon, nitrogen and sulfur. Based on the precise vertical profiles of these chemical parameters, especially of those of redox sensitive elements, the changes of redox conditions of the deep water of the Japan Sea were estimated for the last 35000 years.Organic carbon, nitrogen, total sulfur and 27 major and trace elements were analyzed for 123 samples from and Deep-sea Drilling Core, Leg 127 Site 795 Core, from the Japan Basin of the Japan Sea. Framboidal pyrite spherules were also isolated and the their sulfur isotope ratios were measured. Based on these chemical parameters, the changes in redox conditions of the deep water since the birth of the Japan Sea, ca.15 Ma ago, were estimated. According to these results, the cyclic changes between highly oxic and highly reducing conditions have become significant since 2.4 Ma ago.

从日本海上的日本盆地收集的活塞芯（KH77-3-L4'）样品中分离出framboidal黄铁矿球体，并测量了黄铁矿硫酸盐的硫同位素比率。硫同位素比显示为低的AS-50*，表明在生态底部水域下炸玉米成黄铁矿的合成形成及其有效性，以区分晶状体底部水中Framboidal黄铁矿的形成，其有效性及其通过透明型膜片在Synegenation Potentient dio timentient dio dio dio timentient dio timentient diogentient dio timentient diogentient的有效性下，并具有糖尿病的形成。减少。通过加速器质谱法测量有机碳的C-14年龄。除了有机碳，氮和硫外，还通过中子激活分析来测量二十七个主要和痕量元素含量。根据这些化学参数的精确垂直谱，尤其是氧化还原敏感元素的垂直剖面，估计了过去35000年的日本海深水氧化还原条件的变化。有机碳，氮，总硫和27个主要和27个主要和痕量元素，分析了123个样品，用于日本的123个钻探核e，来自日本的深海，来自7995核心，均来自7995核心。还分离了炸仅黄铁矿球状球形，并测量了其硫同位素比。基于这些化学参数，估计自日本海诞生以来深水氧化还原条件的变化，据估计。根据这些结果，自2.4 mA以前以来，高毒和高度还原条件之间的环状变化变得显着。