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

发布时间：2018-02-03 21:23

本文关键词： 东海表层沉积物碎屑矿物物源沉积环境　出处：《沉积学报》2016年05期 　论文类型：期刊论文

【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。
[Abstract]:In order to further identify the sediment source and hydrodynamic environment in the continental shelf of the East China Sea, the clastic minerals in the surface sediments of the study area were identified and analyzed. 49 heavy minerals were identified in the study area. According to the assemblage distribution of clastic minerals and the characteristics of mineral morphology, the continental shelf area of the East China Sea is divided into three mineral regions, the inland shelf mineral area, the outer continental shelf mineral area and the Hupi reef mineral area, and the inland shelf mineral area. Dynamic sorting is the main factor affecting the distribution of clastic minerals, the material source is relatively single, the clastic minerals are mainly from the modern Yangtze River material, Fujian and Zhejiang coastal rivers input. Human activities also have a certain impact on the mineral composition of the area; In the outer shelf mineral area, the main factor controlling the distribution of heavy minerals is the long-term separation process, mainly because the Yangtze River material was formed in the later stage, and the modern Yangtze River material can be diffused from the central and northern part of the inland shelf to about 124.5 掳E. In addition, the change of topography in the southeast of the outer shelf also controls the distribution of clastic minerals. The Hupi reef mineral area has multiple influences from the Yellow River, Yangtze River and volcanic materials, and the hydrodynamic environment is relatively complex.
【作者单位】：中国科学院海洋研究所海洋地质与环境重点实验室;中国科学院大学;
【基金】：国家自然科学基金重点项目(41430965)~~
【分类号】：P736
【正文快照】： 0引言碎屑矿物是海洋沉积物的基本组成,不同海域由于物质来源及沉积环境的不同,碎屑矿物的组成分布、表面形态等存在明显差异。因此分析碎屑矿物特征可以有效地指示研究区沉积物的来源、扩散路径及沉积环境等。东海宽阔的大陆架北宽南窄,北缓南陡,地形自大陆岸线向东南缓缓倾

【相似文献】