吉林省通化地区南芬组地球化学特征对新元古代大氧化事件的响应  

Response of Geochemical Characteristics to Neoproterozoic Great Oxidation Event from Nanfen Formation in Tonghua Area

作　　者：龚辉 高福红[1] 贾啸宇 Gong Hui;Gao Fuhong;Jia Xiaoyu(College of Earth Science,Jilin University,Changchun 130061,China)

机构地区：[1]吉林大学地球科学学院,长春130061

出　　处：《吉林大学学报(地球科学版)》2025年第2期438-449,共12页Journal of Jilin University:Earth Science Edition

基　　金：吉林省自然科学基金项目(371196080506)。

摘　　要：通过探究吉林省通化地区南芬组的沉积环境,为华北地台北缘提供新元古代大氧化事件的证据支撑。以新元古代南芬组泥灰岩和页岩为研究对象,应用岩石学、地球化学和同位素地球化学研究方法,探讨了南芬组物源区构造背景、南芬组沉积时海水的氧化还原程度及其对新元古代大氧化事件的响应。研究表明:南芬组由紫色和黄绿色页岩、紫色和黄绿色泥灰岩组成,具有海相沉积特征。对沉积物氧化还原环境特征具有指示意义的Ni/Co、V/Cr、V/(V+Ni)值和Mo元素组成及总有机碳质量分数等均显示南芬组沉积时水体环境为氧化环境;南芬组早期具有氧化程度波动变化的特征,晚期氧化程度保持稳定并有减弱趋势。综上认为,华北地台北缘发生了新元古代大氧化事件,并与华南新元古代大氧化事件有良好的响应。In order to provide evidence for the Neoproterozoic great oxidation event on the northern margin of the North China craton,this paper investigates the sedimentary environment of the Nanfen Formation in Tonghua area.Petrology,geochemistry,and isotope geochemistry have been used on marlstones and shales to explore the tectonic setting,the degree of oxidation and reduction,and its response to the Neoproterozoic great oxidation event.The results show that the Nanfen Formation is composed of purple and yellow-green shales and marlstones,with marine sedimentary characteristics.Ni/Co ratio,V/Cr ratio,V/(V+Ni)ratio,Mo content,and total organic carbon content indicate that the sedimentary environment was oxidized during the forming period of Nanfen Formation.The oxidation degree of the Nanfen Formation fluctuated in the early evolutionary stage,and remained stable in the late stage.This proves that the Neoproterozoic great oxidation event occurred on the northern margin of the North China craton and responded well to the Neoproterozoic great oxidation event in South China.

关 键 词：通化地区 南芬组 地球化学 新元古代 大氧化事件 

分 类 号：P59[天文地球—地球化学] P588.2[天文地球—地质学]