Study on mineralogy, geochemistry and original environment of initial polymetallic oxides from the Challenger Deep, Mariana Trench

WANG Hai-feng; LAI Pei-xin; DENG Xi-guang; WANG Fen-lian; YANG Yong; Deng Yi-lan; HE Gao-wen

doi:10.3969/j.issn.1001-909X.2019.01.004

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Journal of Marine Sciences ›› 2019, Vol. 37 ›› Issue (1) : 21-29. DOI: 10.3969/j.issn.1001-909X.2019.01.004

Study on mineralogy, geochemistry and original environment of initial polymetallic oxides from the Challenger Deep, Mariana Trench

WANG Hai-feng, LAI Pei-xin, DENG Xi-guang, WANG Fen-lian, YANG Yong, Deng Yi-lan, HE Gao-wen

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Abstract

Three special polymetallic oxides were taken from the Challenger Deep of Mariana Trench. They were at the initial stage compared to the normal polymetallic nodules. Samples were taken for mineralogical and geochemical analyses, such as X-ray diffraction(XRD) and Mossbauer spectra. Major, trace and rare earth elements(REE) were also measured for all the samples. The results showed that: (1)Compared to the normal polymetallic nodules, the mineralogy of samples were dominated by quartz, plagioclase and clay minerals, but vernadite and todorokite were deficient, which were often seen in polymetallic nodules. (2)Data obtained by Mossbauer spectra indicated that the iron phases were akaganeite(91.6%) and lepidocrocite(8.4%), we suggested it was due to the transmutation from lepidocrocite to akaganeite, a more stable mineral. (3)Higher contents of SiO₂ and Al₂O₃ were found in the samples, but lower contents of Mn, Fe, Cu, Co, Ni in contrast. They were caused by the contamination of pelagic clay and short duration of sorption. (4)Due to the short time for absorption, value of ΣREE was about 0.4×10^-3 in the samples, consumedly lower than that in the normal nodules, of which ΣREE content was usually higher than 1.0×10^-3. The absent of the positive Ce anomaly was due to the reducing bottom-water redox condition and the active hydrothermal fluid.

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polymetallic oxides / mineralogy / geochemistry / Mariana Trench

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WANG Hai-feng, LAI Pei-xin, DENG Xi-guang, WANG Fen-lian, YANG Yong, Deng Yi-lan, HE Gao-wen. Study on mineralogy, geochemistry and original environment of initial polymetallic oxides from the Challenger Deep, Mariana Trench[J]. Journal of Marine Sciences. 2019, 37(1): 21-29 https://doi.org/10.3969/j.issn.1001-909X.2019.01.004

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