Abundances and sources of rare-earth elements in the modern volcanogenic hydrothermal systems of Kamchatka |
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| Authors: | G A Karpov A G Nikolaeva Yu V Alekhin |
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| Institution: | 17175. Institute of Volcanology and Seismology, Far East Branch, Russian Academy of Sciences, bul’v. Piipa 9, Petropavlovsk-Kamchatskii, 683006, Russia
27175. Geological Faculty, Moscow State University, Moscow, 119899, Russia
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| Abstract: | Sources of modern hydrothermal systems are considered on the basis of high-precision REE data on representative samples of characteristic hydrochemical types of hydrothermal systems of the Eastern Volcanic Belt of Kamchatka and data available on modern magmatogenic fluid systems of the Kamchatka, Kuriles, and oceanic rift zones. It was found that modern high-temperature chloride-sodium hydrothermal vents have elevated REE contents and that all considered hydrochemical types of the Kamchatka hydrothermal systems are characterized by similar REE patterns. High REE contents in the hydrothermal vents with pH up to 5.0 show bimodal distribution. Correlations established between La/Yb ratios in the hydrothermal vents of various types and in the igneous rocks of the Eastern Volcanic Belt of Kamchatka are interpreted in genetic terms. A positive correlation was found between rare-earth elements, chlorine and boron contents. It was noted that all considered hydrochemical types show distinct negative europium anomaly, whereas submarine hydrothermal vents of oceanic rift zones are characterized by positive europium anomaly. It was proposed that REE was transported in the hydrothermal vents from apical zones of deep-seated magma chambers containing acid derivatives. |
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