| 广西典型近岸海域表层沉积物碎屑矿物分布及其物源意义 |
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| 作者姓名： | 夏真 林进清 梁开 张顺枝 潘毅 石要红 黄向青 陈太浩 |
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| 作者单位： | 广州海洋地质调查局,广州 510760 |
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| 基金项目： | 中国地质调查局“我国重点海岸带滨海环境地质调查与评价(编号: 1212010611403)”项目资助 |
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| 摘 要： | 基于“我国重点海岸带滨海环境地质调查与评价”项目,分析了广西典型岸段20 m以浅的海域表层沉积物和地貌类型及其分布特征,并在此基础上探讨了碎屑矿物含量和种类的分布、变化以及组合。研究结果表明: 研究区水动力较强,作用方式多样,有近30种碎屑矿物,其中主要有石英、长石、钛铁矿、云母、锆石、黄铁矿以及海绿石等,重矿物较为丰富; 自全新世早期海侵以来,研究区先后进入了浅海海湾相沉积环境,但碎屑矿物种类与之前基本相似,其含量变化是由于气候和海平面的波动而致; 研究区碎屑矿物在以沉积物和地貌类型为单位的各类地质单元中,其含量和种类均有所不同,尤以重矿物的变异性最为突出; 各研究区重矿物组合可分为2~3个亚分区,均反映出与沉积环境关系密切。结果表明,研究区碎屑物质主要源于周缘陆区风化剥蚀、海岸侵蚀和河流输入,碎屑物质具有陆源性。
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| 关 键 词： | 广西近岸 碎屑矿物 分布 物源 |
| 收稿时间： | 2016-06-21 |
Distribution and provenance significance of detrital minerals in surface sediments under typical coastal water areas,Guangxi |
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| Authors: | XIA Zhen LIN Jinqing LIANG Kai ZHANG Shunzhi PAN Yi SHI Yaohong HUANG Xiangqing CHEN Taihao |
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| Institution: | Guangzhou Marine Geological Survey, Guangzhou 510760, China |
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| Abstract: | By the subject named environmental geology survey and evaluation on the national typical coastal water areas, the authors analyzed the surface sediments, the types and distribution of sediments geomorphology in typical coastal water areas shallower than 20 m, Guangxi. And the content of detrital minerals, and their types distribution, variation and combination were studied on this basis. The results show that there are strong hydrodynamic and various ways of current influence on the study areas. And there are nearly 30 types of detrital minerals mainly including quartz, feldspar, ilmenite, mica, zircon, pyrite and glauconite, and rich in heavy minerals. Since the transgression during Early Holocene, the study areas evolved into the depositional environment of shallow-sea bays. And the types of detrital minerals are similar with those before, but their content is different, which is due to climate change and sea-level fluctuation. The types and content of detrital minerals, especially heavy minerals, in the study areas are different in different geological units, which are divided by surface sediments’ and geomorphic types. Heavy minerals combination have 2-3 sub-divisions in these study areas. And these sub-divisions and depositional environment are closely related. The results show that detrital minerals mainly originate from the weathering in onshore area, coastal erosion and river carrying, which indicates that detrital minerals are terrigenous. |
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| Keywords: | Guangxi coastal water areas detrital minerals distribution provenance |
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