| 东海表层沉积物碎屑矿物组合分布特征及其物源环境指示 |
| |
| 引用本文： | 张凯棣,李安春,董江,张晋.东海表层沉积物碎屑矿物组合分布特征及其物源环境指示[J].沉积学报,2016,34(5):902-911. |
| |
| 作者姓名： | 张凯棣 李安春 董江 张晋 |
| |
| 作者单位： | 1.中国科学院海洋研究所海洋地质与环境重点实验室 山东青岛 266071; |
| |
| 基金项目： | 国家自然科学基金重点项目(41430965)National Natural Science Foundation of China |
| |
| 摘 要： | 为进一步明确东海陆架区的沉积物物源及水动力环境，对研究区表层沉积物的碎屑矿物进行了鉴定分析。研究区共鉴定出49种重矿物、8种轻矿物。根据碎屑矿物的组合分布结合矿物形态特征，将东海陆架区划分为三个矿物区，内陆架矿物区、外陆架矿物区及虎皮礁矿物区。内陆架矿物区，动力分选是影响碎屑矿物分布的主要因素，物质来源相对单一，碎屑矿物主要来源于现代长江物质，闽浙沿岸近岸河流的输入，人类活动也对该区的矿物组成产生一定的影响；外陆架矿物区，重矿物分布的主控因素是长期的分选作用，主要是长江物质经后期改造形成，现代长江物质可从内陆架中北部扩散至124.5°E左右，此外外陆架东南部地形的变化也对碎屑矿物的分布起到一定控制作用；虎皮礁矿物区，有来自黄河、长江、火山物质的多重影响，且水动力环境相对复杂。
|
| 关 键 词： | 东海 表层沉积物 碎屑矿物 物源 沉积环境 |
| 收稿时间： | 2015-09-01 |
Detrital Mineral Distributions in Surface Sediments of the East China Sea: Implications for Sediment Provenance and Sedimentary Environment |
| |
| ZHANG KaiDi,LI AnChun,DONG Jiang,ZHANG Jin.Detrital Mineral Distributions in Surface Sediments of the East China Sea: Implications for Sediment Provenance and Sedimentary Environment[J].Acta Sedimentologica Sinica,2016,34(5):902-911. |
| |
| Authors: | ZHANG KaiDi LI AnChun DONG Jiang ZHANG Jin |
| |
| Institution: | 1.Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, Shandong 266071, China;2.University of Chinese Academy of Sciences, Beijing 100049, China |
| |
| Abstract: | The East China Sea continental shelf is an area characterized by complicated hydrodynamic conditions and large variability in sediment texture. Detrital mineral examinations were carried out on 69 surface sediment samples (0~5 cm) collected from the East China Sea continental shelf to investigate the spatial variations of sediment composition and their underlying mechanisms. The average content of heavy minerals in the study area is 16.3%. The high value zone is located in the middle and outer continental shelf while the inner shelf and the southwest of Jeju Island have much lower content. A total of 49 species of heavy minerals were discovered in the study area, dominated by hornblende and followed by epidote, schistose mineral and carbonate mineral; metallic minerals and pyroxene are in the third row; the rest are tremolite, garnet, sphene, zircon, olivine, glauconite, andalusite and so on. Light minerals mainly consist of feldspar followed by quartz; schistose minerals and calcite are respectively in the third and fourth row. According to the characteristics of detrital mineral assemblages, the East China Sea continental shelf can be divided into three districts:Inner-shelf area (Unit I), Outer-shelf area (Unit Ⅱ) and Tiger Reef area (Unit Ⅲ). Sediments in Unit I are mainly from the Yangtze River and the Fujian and Zhejiang coastal rivers. Hydrodynamic sorting is the primary factor that controls the distribution of detrital minerals in this unit; besides human activities also have a certain impact. However the long-term separation is the main control factor of the distribution of heavy minerals in Unite Ⅱ. In the vicinity of the 29°N, fine-grained sediments from the modern Yangtze River were spreading to the northeast into the sea make an obvious effect on the detrital mineral composition in Unit Ⅱ. Unit Ⅲ has relatively varied provenances and complicated hydrodynamic environment. The materials from the Yellow River, the Yangtze River and submarine volcanos both influence there. Thus it has a bigger difference in detrital mineral assemblages with the first two. |
| |
| Keywords: | East China Sea surface sediment detrital mineral provenance depositional environment |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《沉积学报》浏览原始摘要信息 |
| 点击此处可从《沉积学报》下载免费的PDF全文 |
|
