陈延军, 李萍, 徐元芹, 等, xxxx. 西南印度洋龙旂热液区沉积物地球化学特征及其指示意义[J]. 海洋科学进展, x(x): xx-xx. doi: 10.12362/j.issn.1671-6647.20230324002.
引用本文: 陈延军, 李萍, 徐元芹, 等, xxxx. 西南印度洋龙旂热液区沉积物地球化学特征及其指示意义[J]. 海洋科学进展, x(x): xx-xx. doi: 10.12362/j.issn.1671-6647.20230324002.
CHEN Y J, LI P, XU Y Q, et al, xxxx. Geochemical characteristics and indicative significance of sediments in the Longqi hydrothermal area of Southwest Indian Ocean[J]. Advances in Marine Science, x(x): xx-xx. DOI: 10.12362/j.issn.1671-6647.20230324002
Citation: CHEN Y J, LI P, XU Y Q, et al, xxxx. Geochemical characteristics and indicative significance of sediments in the Longqi hydrothermal area of Southwest Indian Ocean[J]. Advances in Marine Science, x(x): xx-xx. DOI: 10.12362/j.issn.1671-6647.20230324002

西南印度洋龙旂热液区沉积物地球化学特征及其指示意义

Geochemical Characteristics and Indicative Significance of Sediments in the Longqi Hydrothermal Area of Southwest Indian Ocean

  • 摘要: 热液区沉积物通常蕴含着热液活动的相关信息,其地球化学特征可以指示物质来源与热液活动情况。本文以龙旂热液区及其周边区域沉积物样品为研究对象,通过沉积物主微量元素地球化学分析,利用元素含量特征分析、特征元素三角图解、稀土元素标准化图解、元素热液贡献计算等方法,探讨了沉积物的物质来源与热液贡献。结果表明,研究区沉积物主要为钙质生源沉积物和含碎屑沉积物;含碎屑沉积物TFe2O3、MnO、P2O5、Ni、Cr、V、Cu含量高于钙质生源沉积物,稀土元素总量整体偏低,呈轻稀土富集、Eu负异常、Ce负异常的特点;由钙质生源、火山碎屑、热液组分及海水作用形成的化学元素构成了主要沉积物物质来源;在含碎屑沉积物中,不同样品热液贡献呈现差异性;热液区对沉积物样品主要影响元素为Fe、Mn。

     

    Abstract: Hydrothermal deposits usually contain information about hydrothermal activities, and their geochemical characteristics can indicate material sources of deposits and hydrothermal activities affect. In this paper, ediment samples from Longqi hydrothermal area and surrounding areas are taken as the research object, the material sources of sediments and the hydrothermal contributions of elements are discussed by means of geochemical analysis of trace elements of sediments, elemental content characteristics, triangle diagram of characteristic elements, standardized diagram of rare earth elements, and calculation of elemental hydrothermal contributions. The results showed that the sediments in the study area were mainly calcareous biogenic sediments and detrital sediments. The contents of TFe2O3, MnO, P2O5, Ni, Cr, V and Cu in the detritus sediments were higher than those in the calcareous biogenic sediments, and the total amount of rare earth elements was generally low, showing the characteristics of light rare earth enrichment, negative Eu anomaly and negative Ce anomaly. Chemical elements formed by calcareous biogenic, pyroclastic, hydrothermal components and seawater were the main sources of sediment materials. In the detrital sediments, the hydrothermal contributions of different samples were different. The main elements of the sediment samples affected by the hydrothermal zone were Fe and Mn.

     

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