摘要
南海神狐海域位于中国南海北部陆坡中段的神狐暗沙东南侧,构造上隶属于珠江口盆地珠二坳陷,具备良好的天然气水合物成藏条件。为揭示该海域表层沉积物的物质来源,本文基于地质调查工作,采用电感耦合等离子体质谱法(ICP-MS)对HSSY03站位的表层沉积物进行了组分分析,重点研究了其稀土元素的地球化学特征,并结合区域地球化学指标对比,探讨了沉积物源区及其贡献。结果表明,该站位表层沉积物与陆源输入具有密切关系;ΣREE与Fe、Ti、Mn元素呈显著正相关,而与Sr、Ca元素呈明显负相关,反映出HSSY03站位的沉积物属于混合型沉积类型。其物质来源主要包括珠江流域输入的陆源碎屑、自生沉积组分以及生源碳酸盐沉积物,三者均对物源构成重要贡献。本研究可为深入理解南海神狐海域天然气水合物的成因机制提供科学依据。
The Shenhu sea area is situated southeast of Shenhu Shoal in the central part of the northern continental slope of the South China Sea.Tectonically,it belongs to the Zhu II Depression of the Pearl River Mouth Basin and exhibits favorable conditions for natural gas hydrate accumulation.To investigate the material sources of the surface sediments in this area,this study conducted component analysis on sediments from the HSSY03 station using inductively coupled plasma mass spectrometry(ICP-MS)based on geological surveys.The study primarily examined the geochemical characteristics of rare earth elements(REEs)and explored sediment provenance along with its contributing factors through a comparative analysis of regional geochemical indicators.The results indicate a close relationship between the surface sediments at this station and terrigenous input.ΣREE shows a significant positive correlation with Fe,Ti,and Mn elements,while a notable negative correlation is observed with Sr and Ca elements.This suggests that the sediments at the HSSY03 station are of a mixed sedimentary type.The sediments are primarily derived from terrigenous clastics input from the Pearl River Basin,authigenic components,and biogenic carbonate sediments,all of which contribute significantly to the provenance.This study provides a scientific basis for a deeper understanding of the formation mechanisms of natural gas hydrates in the Shenhu sea area.
作者
张旭
刘平
陈畅
李梦玲
ZHANG Xu;LIU Ping;CHEN Chang;LI Mengling(Mineral Resources Exploration Center of Henan Provincial Geological Bureau,Zhengzhou,Henan 450000;Institute of Disaster Prevention,Langfang,Hebei 065201)
出处
《地质与勘探》
北大核心
2025年第5期965-975,共11页
Geology and Exploration
基金
中央高校基本科研业务费项目“水合物分布状态及三维孔隙微观分布特征研究”(编号:ZY20160109)资助。
关键词
表层沉积物
稀土元素
物质来源
神狐海域
南海
surface sediments
rare earth elements
material source
Shenhu area
South China Sea
作者简介
第一作者:张旭(1982年-),男,2014年毕业于中国地质大学(武汉),地质矿产专业,获学士学位,高级工程师,现主要从事矿产地质勘查和研究工作。E-mail:6651614@qq.com;通讯作者:刘平(1980年-),女,2011年毕业于中国地质大学(武汉),资源勘查工程专业,获学士学位,高级工程师,现主要从事地震资料处理工作。E-mail:75898356@qq.com。
