南海北部台湾峡谷“蛟龙号”第140潜次沉积物特征及其沉积过程指示意义
Sedimentary characteristics and processes revealed by the push cores of the 140th dive of DSV“Jiaolong”in the Taiwan Submarine Canyon,Northern South China Sea
查看参考文献37篇
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文摘
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海底峡谷沉积物来源、输运机制和沉积过程的研究一直是深水沉积体系研究的关键,也是近年来深海浊流沉积研究中的热点问题。对“蛟龙号”第140潜次在南海北部台湾峡谷中段3个站位获取的沉积物短柱的粒度、有孔虫和黏土矿物进行综合分析,结果表明3个短柱上部均以粒度较细、变化较小并含半深海—深海环境的底栖有孔虫为特征的半深海沉积,下部以粒度明显变粗、含有较多浅水种底栖有孔虫的浊流沉积为主。AMS14 C测年结果显示该浊流沉积形成于约150aBP,表明台湾峡谷中段有典型的近现代浊流活动。此外,黏土矿物组成表明研究区正常半深海沉积与浊流沉积物源主要来自台湾,其次为珠江和吕宋岛的碎屑沉积物。 |
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其他语种文摘
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Transportation and deposition of sediments in submarine canyons are critical for understanding the deep-sea processes and environments,particularly the turbidity currents.In this paper,three push cores,collected from three sites in the middle reaches of the Taiwan Submarine Canyon during the 140th dive of Chinese DSV (Deep Submersible Vehicle)“Jiao Long”,are analyzed for sediment characteristics,sources,and depositional processes.The upper parts of the push cores are dominated by homogeneous fine-grained sediments signified by a typical hemipelagic-pelagic benthic foraminifera assemblage. In contrast,the lower parts consist of coarse-grained sediments and assemblages of“shallow-water”benthic foraminifera typically occur in coastal or shelf areas.Their depositional characteristics suggest a down-slope transportation most likely by turbidity currents along the canyon.AMS14 C dating indicates that the turbidite was formed approximately 150 cal.aBP, and the clay mineral compositions suggests a kind of hemipelagic-pelagic and the turbidite deposits with sediment sources dominantly from the Taiwan island and partly from the Pearl River and Luzon Island. |
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来源
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海洋地质与第四纪地质
,2019,39(4):23-33 【核心库】
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DOI
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10.16562/j.cnki.0256-1492.2018121401
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关键词
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沉积过程
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浊流活动
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“蛟龙号”
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台湾峡谷
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南海
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地址
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1.
中国海洋大学海洋地球科学学院, 青岛, 266100
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中国海洋大学, 海底科学与探测技术教育部重点实验室, 青岛, 266100
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青岛海洋科学与技术试点功能实验室,海洋地质过程与环境功能实验室, 青岛海洋科学与技术试点功能实验室,海洋地质过程与环境功能实验室, 青岛, 266061
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南方科技大学海洋科学与工程系, 深圳, 518055
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0256-1492 |
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学科
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海洋学 |
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基金
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青岛海洋科学与技术国家实验室鳌山科技创新计划项目
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文献收藏号
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CSCD:6561487
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