海相沉积岩磁化率的影响因素  

Influence Factors on Magnetic Susceptibility of Marine Sedimentary Rocks

作　　者：李波[1] 王艳 颜佳新[3] 

机构地区：[1]国土资源部海底矿产资源重点实验室,广州海洋地质调查局,广州510075 [2]广东省有色地质勘查院,广州510080 [3]中国地质大学生物地质与环境地质国家重点实验室,武汉430074

出　　处：《地质科技情报》2015年第4期57-64,69,共9页Geological Science and Technology Information

基　　金：国土资源部海底矿产资源重点实验室开放基金课题(KLMMR-2014-A-12);国家重点基础研究发展计划项目(2011CB808804);国家自然科学基金项目(41072078)

摘　　要：磁化率作为最基础的环境磁学参数,在地层对比划分、环境气候研究中发挥着重要作用。因此,弄清磁化率的影响因素,对保证研究成果的可靠性具有关键意义。沉积岩(物)中磁性矿物的来源复杂,主要分为碎屑来源和自生成因两种。气候变化、海平面波动、碳酸盐产率、火山作用、陨石撞击等影响碎屑来源的磁性矿物,而磁性矿物还原作用、热液流体活动、趋磁细菌生产等因素影响自生成因的磁性矿物,这些因素综合决定了沉积岩的磁化率。As the most basic environmental magnetic parameters, magnetic susceptibility plays an impor- tant role in the researches of stratigraphic division and correlation, reconstruction of paleoclimate and pa- leoenvironment. The controlling factors of magnetic susceptibility are definitive to guarantee the reliability of results. The sources of magnetic minerals in sediments are complex, which could be mainly divided into two groups： authigenic and detrital. Climate change, sea-level fluctuations, carbonate productivity, volca- nism, and meteorite impacts could potentially make a contribution to the detrital sources of magnetic min- erals. Besides, reduction of magnetic mineral, hydrothermal fluid activities and metabolism of magnetotac- tic bacteria could incorporate the formation of authigenic magnetic minerals. All of the processes men- tioned above comprehensively have an influence on the magnetic susceptibility of sediments.

关 键 词：环境磁学 磁化率 沉积岩 成岩作用 古气候 碳酸盐产率 

分 类 号：P588.2[天文地球—岩石学]