| 摘要: |
| 应用X射线衍射(XRD)方法对南通近海137个表层沉积物<0.002mm的粘土组分进行分析，研究了南通近海表层沉积物中粘土矿物的组合特征、分布规律以及物质来源.结果表明，研究区粘土矿物中伊利石相对百分含量最高(70.6%~80.3%,平均值为75.0%),高岭石(9.8%~14.9%,平均值为12.4%)和绿泥石(8.1%~12.4%,平均值为10.3%)次之，蒙脱石含量最低(0~4.0%,平均值为2.3%);粘土矿物组合类型以伊利石-高岭石-绿泥石-蒙脱石型为主，伊利石高岭石-绿泥石型次之.南通近海表层沉积物中粘土矿物主要为陆源成因，春夏季(5~9月)东北向扩展的长江冲淡水为研究区提供物源. |
| 关键词: 海洋地质学 粘土矿物 分布特征 物源分析 长江冲淡水 |
| DOI： |
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| 基金项目:中国地质调查局海洋地质保障工程专项资助项目(GZH201200506);国土资源部海洋油气资源与环境地质重点实验室资助项目(MRE201308):国家重点基础研究发展计划和重大科学研究计划资助项目(2013CB956500) |
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| Distribution pattern of clay minerals in surface sedimentsof Nantong offshore areas and their provenance |
| XIANG Lihui,ZHANG Xiaofei,LIU Qiang,OU Yangkai,ZHANG Gang,FAN Yanbin |
| (Eatern China Geological &Mining Organization for Non-ferous Metals in Jiangsu Province,Nanjing210007,China;Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology,Ministy of Land and Resources,Qingdao 266071,China) |
| Abstract: |
| Clay components(<0.002 mm)of 137 surface sediments in Nantong offshore areas were analyzed by XRD.The study was focused on clay assemblages,distribution pattern and provenance.The results show that illite(75.0%ranges from 70.6%to 80.3%)dominates in surface sediments of Nantong offshore areas with kaolinite(12.4%ranges from 9.8%to 14.9%)and chlorite(10.3%ranges from 8.1 to 12.4%)as the second and smectite(2.3%ranges from O to 4.0%)the lowest.The assemblage of llite-kaolinite-chlonite-smectite is the main typeof the clay minerals assemblage in the area,followed byillte kaolinite-chlorite assemblage.Clay minerals in thesurface sediments of Nantong were mostly terigenous materials and provided by the northeastward extension ofChangjiang dilute water. |
| Key words: marine geology clay mineral distribution pattern provenance analysis Changjiang diluted water |
