磁性地层学定年在中国近海及海域沉积物中的应用与进展  

Application and Progress of Magnetostratigraphy Dating in Coastal and Marine Sediments of China

作　　者：田成静[1] 李明坤[2,3] Tian Chengjing;Li Mingkun(MNR Key Laboratory of Marine Mineral Resources,Guangzhou Marine Geological Survey,Guangzhou 510075,China;Key Laboratory of Ocean and Marginal Sea Geology,GuangzhouInstitute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]自然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]中国科学院广州地球化学研究所边缘海与大洋重点实验室,广州510640 [3]中国科学院大学,北京100049

出　　处：《南海地质研究》2016年第1期112-127,共16页Gresearch of Eological South China Sea

基　　金：国土资源部海底矿产资源重点实验室开放基金项目(No.KLMMR-2014-A-12);中国地质调查局项目(No.GZH201300502)资助。

摘　　要：磁极倒转具有全球同步变化的特征,其在沉积物中的记录可以很好地应用于建立海洋及海岸带沉积物的定年。近年来发展起来具有全球一致的地磁场长期变化(PSV)曲线,为短时间尺度的沉积物定年提供了一个有效的方法。磁性地层学定年在中国近海和海域沉积物中的应用广泛,对基本年代框架的厘定,以及与年代学相关的不同区域间的沉积速率对比、珊瑚礁生长与发育和海底扩张时间的确定等有很好的应用价值。但也有一些需要注意的问题,如沉积间断识别,可能存在的还原成岩作用对磁性矿物的溶解等。Magnetic polarity reversal has the characteristics of global synchronous change,and it can be applied very well to date the ocean and coastal sediments.The consistency of the long-term variation of the geomagnetic field(PSV)curve developed in recent years provides an effective method to date the short-term scale sediments.The Magnetostratigraphy dating was widely used in the study of coastal and marine sediments of China.It plays a very important role in the determination of the basic chronological framework,the comparison of the deposition rates between different regions associated with chronology,the growth and development of coral reefs,and the determination of seabed expansion time.However,some issues should be considered in the study of magnetostratigraphy,such as the deposition of intermittent identification,the possible reduction of diagenetic effects on the dissolution of magnetic minerals.

关 键 词：磁性地层学定年 地磁场长期变化 中国海域 沉积物 

分 类 号：P539.3[天文地球—古生物学与地层学]