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通过对长江口及邻近陆架区现代沉积物中自生硫化铁、细菌、沉积物和间隙水化学成份研究表明,研究区自生黄铁矿主要受硫酸盐还原和元素硫供给速度的控制。 利用~(210)Pb的资料证实,研究区自生黄铁矿形成约需10年左右时间。作者提出,在基本相同的沉积环境中,利用自生硫化铁中FeS_2/FeS克分子比值最高值在沉积柱上所对应的沉积物厚度,除以自生黄铁矿在该环境中形成所需的时间,就可得出不同站位上的沉积速率,其结果和~(210)Pb、生物及地质学上描述的沉积速率基本一致。
The study on the chemical composition of spontaneous iron, iron, bacteria, sediment and interstitial water in the modern sediments of the Changjiang Estuary and its adjacent shelf shows that the authigenic pyrite in the study area is mainly controlled by the rate of sulfate reduction and elemental sulfur supply. The data of ~ (210) Pb confirm that the formation of authigenic pyrite takes about 10 years. The authors propose that in essentially the same depositional environment the thickness of the sediment corresponding to the highest molar ratio of FeS 2 / FeS in the spontaneous iron sulfide to the sedimentary column is divided by the time required for the authigenic pyrite to form in the environment , The deposition rate at different stations can be obtained. The result is consistent with ~ (210) Pb, biologically and geologically described deposition rate.