Ferro-manganese nodules from the Kara Sea: Mineralogy, geochemistry and genesis
| العنوان: | Ferro-manganese nodules from the Kara Sea: Mineralogy, geochemistry and genesis |
|---|---|
| المؤلفون: | Andrey K. Khudoley, Oleg S. Vereshchagin, A. I. Brusnitsyn, Elena N. Perova, Victoria Ershova, Vladimir V. Shilovskikh, Elena V. Molchanova |
| المصدر: | Ore Geology Reviews. 106:192-204 |
| بيانات النشر: | Elsevier BV, 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Birnessite, 020209 energy, Ferromanganese nodules, Geochemistry, Mineralogy, Geology, 02 engineering and technology, Electron microprobe, 010502 geochemistry & geophysics, 01 natural sciences, Ferromanganese, Hydrothermal circulation, Diagenesis, Geochemistry and Petrology, 0202 electrical engineering, electronic engineering, information engineering, Economic Geology, Inductively coupled plasma mass spectrometry, Chemical composition, 0105 earth and related environmental sciences |
| الوصف: | Sixteen ferromanganese nodules collected from a large area in the Kara Sea were studied by optical and scanning electron microscopy, X-ray powder diffraction, X-ray fluorescence analysis, inductively coupled plasma mass spectrometry, and electron microprobe analysis. The geological setting, chemical and mineralogical features suggest that Fe-Mn concretions of the Kara Sea mainly were formed by diagenetic process, while hydrogenetic process is secondary if present. The studied nodules are characterized by the alternation of Mn- and Fe-P-enriched laminae. The Fe-P-rich laminae are almost completely composed of an amorphous phase under X-ray. We consider that the phosphatization process did not occur during formation of the Fe-Mn crusts and nodules from the Kara Sea. Several Mn-bearing phases are present in the studied samples (buserite-1, birnessite and X-ray amorphous phase). All studied nodules have similar contents of the main chemical elements. In all cases, the samples are depleted in light REE, enriched in heavy REE, and have negative Ce and Y anomalies. Our data indicate that diagenetic crusts and nodules differ significantly in terms of chemical composition from other types of Fe-Mn concretions. Based on their Co, Ni, Cu, Ce, Zr and Mo contents, we could differentiate diagenetic concretions from hydrogenetic and hydrothermal (both high and low-temperature) concretions. |
| تدمد: | 0169-1368 |
| DOI: | 10.1016/j.oregeorev.2019.01.023 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::1d1d5ebd53eff9c217a2598cf6500c9a https://doi.org/10.1016/j.oregeorev.2019.01.023 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi...........1d1d5ebd53eff9c217a2598cf6500c9a |
| قاعدة البيانات: | OpenAIRE |
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