早期地球海洋水化学分带的理论预测

被引：29

作者：

李超 ^{[1
]}

程猛 ^{[1
,2
]}

Thomas JALGEO ^{[1
,3
,4
]}

谢树成 ^{[1
]}

机构：

[1] 中国地质大学生物地质与环境地质国家重点实验室

[2] 中国地质大学地球科学学院

[3] 中国地质大学地质过程与矿产资源国家重点实验室

[4] Department of Geology, University of Cincinnati

来源：

中国科学:地球科学 | 2015年 / 45卷 / 12期

关键词：

元古代; 寒武纪早期; 海洋氧化还原化学; 缺氧; 硫化;

D O I：

暂无

中图分类号：

P736.4 [海洋地球化学];

学科分类号：

070902 [地球化学];

摘要：

寒武纪早期及以前的地球海洋(>520 Ma;以下简称为"早期地球海洋")具有广泛缺氧分层和有限氧化剂供应等特点,其化学特征可与现代海洋陆架区沉积物孔隙水类比.依据相似的地球化学原理和对于早期地球海洋化学形成机制的理解,本文提出早期地球海洋在陆架-斜坡浅水-中等水深区域在理想化条件下可能存在多个由不同氧化还原过程控制的动态化学分带,从近岸浅水到远洋深水依次发育:氧化带、NO3?-NO2?富集带、Mn2+-Fe2+富集带、硫化带、CH4富集带和深水Fe2+区.它们是大气自由氧对表层海水的氧化、化学跃变层之下反硝化作用、近岸区域锰铁氧化物还原作用、硫酸盐还原作用、产甲烷作用和深水热液Fe2+输入动态平衡后的结果.该化学分带模型细化了目前已有的古海洋水化学状态分类,对现有的古海洋"硫化楔"模型进行了扩展和补充,并较好解释了早期地球海洋不寻常的Mo-S-C同位素地球化学记录.该化学分带模型对未来早期地球海洋化学演化及元素生物地球化学循环研究具有指导意义.

引用

页码：1829 / 1838

页数：10

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