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17000 a以来冲绳海槽中部柱状样S10沉积学特征及其物源环境指示
彭娜娜
Subtype硕士
Thesis Advisor曾志刚
2016-05-26
Degree Grantor中国科学院大学
Place of Conferral北京
Degree Discipline海洋地质学
Keyword微量元素 稀土元素 黏土矿物 物源 东亚冬季风 冲绳海槽
Abstract基于AMS14C高精度定年,本文对冲绳海槽中部陆坡区岩芯S10展开粒度、微量元素和黏土矿物分析,分别从稀土元素和黏土矿物角度探讨冲绳海槽中部岩芯沉积物的物质来源。结果表明,岩芯S10记录了冲绳海槽中部约17 000 a以来沉积物的物源变化,沉积物主要由来自长江、黄河和台湾的陆源物质和火山物质组成,不同时期各源区物质贡献程度不同。16 500~11 600 a,长江、黄河陆源碎屑为主;11 600~7 750 a,海平面变化大,长江、黄河物质为主;7 750~6 450 a,沉积物全岩样稀土元素显示火山物质为主要物源,黏土矿物组成显示细粒沉积物以黄河碎屑为主,说明粗粒物质主要为火山物质,细粒物质主要为黄河碎屑物质;6 450~3 900 a,稀土元素显示沉积物在4 000 a左右受火山物质影响,黏土矿物显示细粒沉积物以长江、黄河陆源碎屑为主,台湾物质有一定影响;3 900~1 900 a,岩芯碎屑物质主要来自长江和黄河,台湾物质略有增多;1 900 a至今,稀土元素显示黄河物质为主,而黏土矿物显示细粒物质以长江碎屑为主,台湾物质影响增强。本文利用稀土元素的物源判别公式DF计算得到长江、黄河、台湾和火山潜在物源的DF值,长江、黄河陆源DF值记录并反映了17 000 a以来冬季风的演变情况,可作为东亚冬季风强弱演化指标。黏土矿物中高岭石和蒙脱石形成条件独特,物源区相对单一,可将高岭石和蒙脱石含量做为东亚冬季风强弱演化的另一项指标。本文研究结果表明,冲绳海槽中部微量元素和黏土矿物研究可得到海槽17 000 a以来物源及东亚冬季风的演化情况,对于重建全新世以来冲绳海槽内部沉积物物源及古环境的演变历史具有重要意义。
Other AbstractBased on precise AMS14C dating data, we analyzed the grain size, trace elements and clay minerals of sediment core S10, collected from the Central Okinawa Trough. We investigated the sediment provenances of the research region with the rare earth elements data and clay minerals data respectively. The results indicate that core S10 records the evolution of sediment provenances of the Central Okinawa Trough since 17 000 a. Sediments in the study area were mainly composed of terrigenous sediments and igneous materials, with terrigenous sediments predominately came from the Yangtze River and the Yellow River as well as rivers from Taiwan, while the contribution of these provenances varied during the historical sediment periods. During period of 16500~11600a, sediments were mainly terrigenous sediment provenances, coming from the large rivers in East China (the Yangtze River and the Yellow River). In the period of 11600~7750a, although the sea level changed dramatically, sediments remained to be terrigenous sediments from the Yangtze River and the Yellow River. During period of 7750~6450a, the total sediments rare earth elements data reveals that sediments predominately were volcanic materials which were acknowledged as K-Ah ash layer, while clay minerals indicate terrigenous sediment provenance was the Yellow River, which means the coarse grain sediments were mainly from volcanic materials and the fine grain sediments were mainly from the Yellow River. From 6450 to 3900a, the total sediments rare earth elements data shows that terrigenous sediments increased and volcanic materials decreased except for approximate year of 4000, when another volcanic eruption intruded and clay minerals indicate that fine grain sediments were mainly from the Yangtze River and the Yellow River, with little influence from Taiwan River. In the period of 3900~1900a, terrigenous sediments were mainly from the Yangtze River and the Yellow River, with a little more sediments coming from Taiwan River. Since 1900a, the total sediments rare earth elements show terrigenous sediments from Yellow River predominated the sediments of Core S10, while clay minerals indicate that the fine grain sediments were mainly from the Yangtze River as well as the Taiwan River. In this study, discriminant function(DF) data of the Yangtze River and the Yellow River could be used as a new evidence of the East Asian Winter Monsoon evolution since 17 000 a. Furthermore, kaolinite and smectite were generated in the special conditions which made them come from the simplex provenance. And these two clay minerals can be used as another index of the East Asian Winter Monsoon. All these results in this paper demonstrate that rare earth elements and clay minerals study of sediments in the Central Okinawa Trough could help to clarify the evolution of sediment provenances and the East Asian Winter Monsoon since 17 000 a, which will benefit for the reconstruction of the sediment provenance and paleoenvironment evolution history.
Subject Area地质学
Language中文
Document Type学位论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/112555
Collection海洋地质与环境重点实验室
Affiliation中国科学院海洋研究所
Recommended Citation
GB/T 7714
彭娜娜. 17000 a以来冲绳海槽中部柱状样S10沉积学特征及其物源环境指示[D]. 北京. 中国科学院大学,2016.
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