南海北部陆缘黏土矿物组合特征与地质意义  

Characteristics of Clay Mineral Assemblage in Northern South China Sea Continental Margin and Its Geological Implications

作　　者：吴梦霜[1,2] 邵磊[1] 庞雄 梁建设 

机构地区：[1]同济大学海洋地质国家重点实验室,上海200092 [2]中国海洋石油(中国)有限公司深圳分公司研究院,广州510240 [3]中国海洋石油(中国)有限公司研究总院,北京100027

出　　处：《同济大学学报（自然科学版）》2014年第4期630-635,共6页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金(91128207;40976023);国家科技重大专项(2011ZX05025-006);国家"九七三"重点基础研究发展计划(2007CB819501;2009CB219400)

摘　　要：采用沉积矿物分析方法对南海北部九口探井渐新世—中新世沉积物进行系统的黏土矿物分析.结果表明:南海北部沉积物黏土矿物组成随时间及空间呈现规律性变化,黏土矿物伊/蒙转化深度具有自北向南逐步变浅的规律,与地温梯度升高变化趋势基本一致,这种黏土矿物伊/蒙转化的变化规律反映了南海北部洋陆过渡地壳减薄,莫霍面抬升,热流值升高的趋势.通过黏土矿物组合演变特征与热流变化趋势的相关关系,可以预测区域性温度场变化规律,加深对南海北部洋陆过渡地壳厚度变化的认识.The clay minerals of sediments from 9 wells in the northern South China Sea during the period from Oligocene to Miocene. were systemically analyzed based on sedimentary mineral analytical methods, Results show these clay minerals assemblage changes regulary with time and space. Illite- smectite transition depth decreases from north to south, which is similar to the increasing trend of geothermal gradients. This illite-smectite transition pattern reflects the thinning of the oceanic-continental transitional crust in the northern South China Sea, and the uplifting of Moho surface, and the increasing of thermal flow index. The study of the relationship between clay mineral assemblage evolution and the trend of thermal flow change can help to forecast regional temperature field change law and understand thickness change of the oceanic-continental transitional crust in the northern South China Sea.

关 键 词：南海 黏土矿物 成岩作用 大地热流值 地温梯度 

分 类 号：P736.21[天文地球—海洋地质]