Characteristics and Origins of Suspended Pyrite in the Mixing Zone of the Yangtze Estuary  

作　　者：PANG Yue FAN Dejiang SUN Xiaoxia SUN Xueshi LIU Ming YANG Zuosheng 

机构地区：[1]Key Laboratory of Submarine Geosciences and Prospecting Techniques,Ministry of Education,Ocean University of China,Qingdao 266100,China [2]Laboratory for Marine Geology,Qingdao National Laboratory for Marine Science and Technology(QNLM),Qingdao 266061,China [3]Center for Isotope Geochemistry and Geochronology,Qingdao National Laboratory for Marine Science and Technology(QNLM),Qingdao 266061,China

出　　处：《Journal of Ocean University of China》2020年第4期801-810,共10页中国海洋大学学报（英文版）

基　　金：the National Natural Science Foundation of China(NSFC);who organized the public survey cruise in the Yangtze River Estuary in March 2015,with special thanks to the crew of the R/V Run Jiang No.1 for kindly assisting in sediment sampling on the cruise;This study was funded by the NSFC(No.41676036)and the National Key R&D Program of China(No.2016YFA0600904).

摘　　要：For a long time,most studies about pyrite have focused on sediments while only a few have focused on pyrite in water.In this study,a method that combines the scanning electron microscopy(SEM)and the energy dispersive X-ray spectrometry(EDS)was used to compare pyrite particles suspended in water to those in associated bottom sediments,both obtained from the mixing zone of the Yangtze Estuary.It was found that the pyrite particles in the two media have similar morphologies and size distributions.The particle morphology mainly includes two types,single crystal and aggregate,and the particle size mainly ranges from 0.5 to 2μm.The pyrite particles in water exhibit an increase in relative content towards the sea,and their transport and deposit processes are mainly affected by hydrodynamic conditions.It is concluded that the pyrite particles in the suspended matter mainly derived from the resuspension of sediments,which are products of the early diagenesis.Precursor minerals may appear during the formation of pyrite,but are generally restricted by the diagenetic environment and local microenvironment.

关 键 词：Yangtze Estuary suspended matter PYRITE RESUSPENSION authigenic mineral 

分 类 号：P736.3[天文地球—海洋地质]