辽河三角洲湿地表层沉积物的风化特征及其对生物作用的指示意义  

Weathering Characteristics of the Surface Sediments and Their Indications for Biological Process in the Liaohe Delta Wetlands

作　　者：李通通 叶思源[2,3] 韩宗珠[1] 袁红明[2,3] 裴理鑫 LI Tongtong;YE Siyuan;HAN Zongzhu;YUAN Hongming;PEI Lixin(College of Marine Geosciences,Ocean University of China,Qingdao,Shandong,266100;Key Laboratory of Coastal Wetland Biogeosciences,China Geologic Survey,Qingdao,Shandong,266071;Qingdao Institute of Marine Geology,Qingdao ,Shandong,266071;School of Earth Sciences,China University of Geosciences(Wuhan ),Wuhan,430074)

机构地区：[1]中国海洋大学海洋地球科学学院,山东青岛266100 [2]中国地质调查局滨海湿地生物地质重点实验室,山东青岛266071 [3]青岛海洋地质研究所,山东青岛266071 [4]中国地质大学(武汉)地球科学学院,武汉430074

出　　处：《地质论评》2019年第1期40-51,共12页Geological Review

基　　金：科技部中美政府间科技创新重点专项(编号:2016YFE0109600);大地调项目(编号:DD20189503;DD20160144;GZH201200503和1212010611402);国土资源部公益性行业基金项目(编号:201111023);国家自然科学基金青年基金资助项目(编号:41240022;40872167和41406082)的成果~~

摘　　要：通过对辽河三角洲273个上三角洲平原湿地表层沉积物及100个浅海湿地表层沉积物的粒度和常量元素的系统测试,且对其中的128个表层沉积物样进行了球囊霉素蛋白(GRSP)的提取与分析,揭示了研究区GRSP、粒度、常量元素分布和风化特征及其控制机制,研究表明:上三角洲平原湿地表层沉积物以砂质粉砂和粉砂为主,而浅海湿地表层沉积物由于受潮汐及波浪的淘洗作用影响,颗粒较粗以粉砂质砂和砂质粉砂为主;研究区常量元素以SiO_2和Al_2O_3含量最高,其它元素平均含量均小于5%,且除了CaO外,其它常量元素与沉积物粒度呈显著相关(p<0.01);值得注意的是,本研究发现有植被覆盖的上三角洲平原湿地地区的风化指数(CIA=58.50)显著地高于浅海湿地沉积物的风化指数(CIA=50.17,p<0.05)以及近基岩山区的风化指数(CIA=52,p<0.05),Na/K值与CIA指数分析表明该区从近基岩山区、浅海湿地至有植被覆盖的上三角洲平原湿地依次呈未受化学风化、初等化学风化和中等化学风化过渡特征,且CIA值与GRSP含量呈显著相关(r=0.47,p<0.01),由此揭示了生物作用在地质体风化过程的重要意义。Objectives: In order to reveal the relationship among the particle size,major elements,glomalin-related soil protein( GRSP) distributions,and to explore weathering characteristics and the control mechanism in Liaohe river Delta.Methods: 373 surface sediments across the upper delta plain wetlands( UDPW) and shallow-sea wetlands( SSW) were collected from study area. The particle size were tested by Master sizer 2000 laser particle size analyzer,and major elements of surface sediments were tested by Axios PW4400 X-ray fluorescence spectrometer,GRSP analyses used Coomassie plus( Bradford) assay method.Results: The averaged mean grain size( Mz) of sediment in the SSW was 5.22 ± 0.14 Ф,significantly larger than that in the UDPW. Six types were identified for the SSW and river channel,less concentrated than UDPW,where presenting mainly sandy silt and silt,and indicating less sorting degree.The contents of SiO2 and Al2O3 were the highest in the study area,and the average contents of other elements were generally less than 5%. With the exception of CaO,other constant elements were significant correlated with sediment particle size( p < 0. 01);Notably,the mean value of chemical index of alteration( CIA = 58.50) of the vegetated UDPW were significantly higher than that of the SSW( CIA = 50.17,p<0.05) and the flooding area,where is near bedrock mountains( CIA= 52.00,p<0.05).Moreover,the CIA values were significant correlated with GRSP content( r = 0.47,p<0.01).Conclusions: The surface sediments of the UDPW are mainly sand silt and silt,while,the surface sediments of the SSW are mainly silty sand and sandy silt due to the influence of tide and wave actions.The contents of CaO、Na2O and K2O in the UDPW were higher than SSW.There were the high correlations between chemical element and grain size.The Na/K ratio and CIA index analyses showed that the sediments in the LHD wetlands were experienced three weathering stages,namely,unweathering,primary and moderate weathering. Moreover,the correlations between CIA values and GRSP c

关 键 词：球囊霉素蛋白 常量元素 化学风化 辽河三角洲 

分 类 号：P512[天文地球—地质学]