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REN Jiang-bo WANG Fen-lian HE Gao-wen ZHANG Xin DENG Xi-guang YU Hong-xia 《光谱学与光谱分析》2021,41(6):1834-1840
西太平洋富钴结核是近年来新发现的海底固体矿产资源,富含Mn,Fe,Co,Ni和Cu等多种关键金属元素。富钴结核是一种非均质的地球化学和矿物学集合体,粒径约6 cm的结核在生长过程中记录了数千万年的海洋沉积历史,亟需高分辨率的分析技术揭示古海洋环境信息。采用微区X射线荧光光谱仪(μ-XRF),对C3BC1704富钴结核开展多元素面扫描,获得了原位高分辨率多元素的信号强度数据,评价了μ-XRF技术在富钴结核中的应用质量。元素信号谱峰特征和数据频谱分布结果显示,富钴结核中Mn,Fe,Ti,Co,Ca和Ni等元素信号强度敏感,数据呈现相对较好的正态分布特征,可用于定量或半定量分析;Si,Cu和Al等元素信号较弱,数据呈现左偏的正态分布特征,建议相关数据仅作参考。μ-XRF获得的数据量庞大且彼此独立,本研究将不同元素连接成彼此关联的多维矩阵,实现了数据的位置信息和特征元素之间的数学运算和筛选,了解了金属元素的分布和变化特征,揭示了富钴结核生长过程的环境变化。结果显示,Mn和Fe等元素在生长层中波动剧烈,金属元素在富钴结核中的分布极不均匀,显示出多成因类型的交替微层和7个大的生长周期旋回。C3BC1704富钴结核主体暴露在海水中,金属元素主要来自海水,化学组成指示为典型的水成成因。进一步定量分析结果显示,Mn,Cu和Ni等元素含量从内部向外围呈现同步降低的趋势,Fe,Ti和Co等元素含量则呈现同步升高的趋势,这些特征指示早期偏向于成岩富集环境,晚期则以水成富集为主。富钴结核金属元素的分布和变化特征,清晰呈现了富钴结核的生长结构,揭示了富钴结核生长过程的环境变化,有利于富钴结核的成矿模型的构建。 相似文献
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Variational iteration method for solving perturbed mechanism of western boundary undercurrents in the Pacific 总被引:9,自引:0,他引:9 下载免费PDF全文
A class of perturbed mechanisms for the western boundary
undercurrents in the Pacific is considered. The model of generalized
governing equations is studied. Employing the method of variational
iteration, an approximate solution of corresponding model is
obtained. It is proved from the results that the solution for the
variational iteration method can be used for analysing operation of
the perturbed mechanism of western boundary undercurrents in the
Pacific. 相似文献
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西太平洋上层海水的氦同位素分布 总被引:1,自引:0,他引:1
本文使用VG-5400稀有气体同位素质谱计,测量了100个西太平洋上层海水(≤300m)的He同位素组成,论述了He同位素的分布特征以及北太平洋中层水随赤道上升流上涌造成的~3He过剩和南海与太平洋海水的交换产生的~3He亏损,并运用He同位素示踪特性探讨了海域不同水团的混合作用。研究还表明He同位素可以用来指示海洋的环流。 相似文献
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海山玄武岩记录着海山演化以及相关深部过程的重要信息。对西太平洋戈沃罗夫平顶海山、牛郎平顶海山、阿诺德平顶海山、斯科尔尼亚科瓦平顶海山、戈尔金平顶海山、麦克唐奈平顶海山、令仪海山、徐福平顶海山玄武岩进行岩石学和等离子体质谱测试分析,结果表明:研究区玄武岩多呈杏仁状、气孔-杏仁状、块状构造,斑状结构。岩石主要由斑晶、基质组成。斑晶的矿物成份主要为斜长石、橄榄石和单斜辉石。基质的矿物成份主要为斜长石、橄榄石、单斜辉石和玻璃质等。不同海山玄武岩的稀土配分模式以及稀土参数均反映了洋岛玄武岩的典型特征,表明了研究区海山是一组属于多热点成因的典型板内火山型海山,可能受过了多期次的区内断裂岩浆活动的影响。 相似文献
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第八届西太平洋声学大会于2003年4月7日—9日在澳大利亚墨尔本召开。19个国家和地区的声学家参加了这次大会。此次会议覆盖了大部分与声学有关的学科,包括生物声学、语音、建筑声学、噪声与振动、电子设备、水声学、音乐、主动噪声控制、环境声学测量、换能器、心理声学、信号处理、超声等。 相似文献
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The two annual northward jumps of the West Pacific Subtropical High and their relationship with summer rainfall in Eastern China under global warming 下载免费PDF全文
The two northward jumps of summer West Pacific Subtropical High (WPSH) are defined based on the pentad-scale ridge data of the WPSH ridge in 1951 to 2012. The times of the northward jumps are found to have obvious inter-annual and decadal characteristics, i.e., the occurrence of the first northward jump of WPSH shows a "consistently early-consistently late" decadal pattern, with the transition around 1980; the occurrence of the second northward jump of WPSH shows a "consistently late-consistently early-consistently late" decadal pattern, with the transitions about 1955 and 1978, respec- tively, which is consistent with global warming. In the meantime, the times of the two northward jumps not only have a good correspondence to the beginning and ending dates of the rainy season, but also greatly influence the position of the main rain belt in Eastern China. When the first northward jump occurs early, the main rain belt is located from just north of 30~ N to the south of North China, while the opposite situation appears when the first jump occurs late. When the second jump occurs early, more rain falls over North China and South China, but less falls in the Yangtze River region, while the opposite situation appears when the second jump occurs late. In the four cases when abnormalities occur in the same year as early or late northward jumps, the position of the main rain belt can be considered as a superposition of isolated abnormal effects of the two northward jumps. Moreover, the prophase and synchronous forces of the sea surface temperature in the Pacific has great influence on the times of the northward jumps, and the driving forces of the two jumps differ. 相似文献
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