广东近岸海域矿物特征指数分布及指示意义  

DETRITAL MINERAL INDEXES OF THE BOTTOM SEDIMENTS OF GUANGDONG COASTAL WATER:DISTRIBUTION AND IMPLICATIONS

作　　者：颜彬 谢敬谦 黄博 高宁[3] 

机构地区：[1]国家海洋局南海调查技术中心,广州510300 [2]青岛国家海洋科学研究中心,青岛266071 [3]国家海洋环境监测中心,大连116023

出　　处：《海洋地质前沿》2017年第11期1-8,共8页Marine Geology Frontiers

基　　金：国家海洋局南海分局局长基金(1314)

摘　　要：在从"源"到"汇"的沉积物输运过程中,近岸海域由于接近沉积物的源头,沉积物的物质组成相似程度较高,沉积动力环境复杂,难以用元素化学和矿物组成特征等方法区分沉积物的分布规律和控制因素。通过分析珠江口及其周边海域表层沉积物的碎屑矿物含量及特征指数发现,成分成熟度和物源区指数的分布特征主要受物源组分的影响,而ZTR指数的分布特征能够明显体现出水动力条件的分选作用对沉积物分布的影响;重矿物分异指数对海域内的水动力变化趋势的反映最敏锐。由此可见,在物源组成相似程度较高的近岸海域,碎屑矿物的特征指数分析能够作为一种反映物源相似程度较高的近岸海域内沉积物的分布规律及其影响因素的分析方法。Along the path of sediment transportation from ＂source＂to＂sink＂,coast is the area relatively close to the source.Sediments there usually have similar composition but complex depositional dynamics.It is difficult to use the methods of element chemistry and mineralogy to define the distribution pattern of sediments.In this paper,mineral indexes are adopted to study the distribution pattern and influence factors based upon 312 bottom samples collected from the near-shore area of Guangdong Coast.The study reveals that the composition maturity index and the provenance index of light minerals are mainly depending upon the composition of source sediments,while the ZTR index is more closely related to hydrodynamic changes.The differentiation index of heavy mineral is the most sensitive indicator to water dynamics.The results further suggest that in the near-shore area for the sediments with similar mineral composition,detrital mineral indexes could be used as a key to reveal the distribution pattern and its influential factors for marine sediments.

关 键 词：碎屑矿物 矿物特征指数 水动力 沉积物 分布特征 

分 类 号：P736.3[天文地球—海洋地质]