

FOLLOWUS
1.Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2.Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
jihliu@fio.org.cn
Received:27 January 2022,
Published:01 May 2023
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HU Qiannan,LI Chuanshun,YANG Baoju,et al.Clay mineral distribution characteristics of surface sediments in the South Mid-Atlantic Ridge[J].Journal of Oceanology and Limnology,2023,41(03):897-908.
Clay minerals are usually considered as important indicators to identify sources in both terrigenous and marine sediments. In particular
clay minerals in metalliferous sediments (MS) have long been studied in global oceans except in South Mid-Atlantic Ridge (SMAR) due to limited explorations. Thus
32 MS and 34 non-MS (NMS) samples were analyzed to clarify the distribution characteristics and mineral compositions of clay minerals. All the sediments were collected along the SMAR between 12°S and 27°S. After removal of organic matter and carbonate
clay fractions (<2 μm) were investigated by X-ray diffraction (XRD) analysis. Results show that clay mineral assemblages of surface MS consist dominantly of smectite
less abundant illite
chlorite
and kaolinite in average weight percentage of 30%
21%
18%
and 16%
respectively. On the other hand
clay mineral assemblages in the NMS consist mainly of illite
less abundant kaolinite
chlorite
and very scarce smectite in average weight percentage of 47%
29%
24%
and 0.2%
respectively. The clay fractions in MS are mainly composed of amorphous or poorly crystallized Fe/Mn oxyhydroxides
clay mineral
quartz
and plagioclase. However
the counterparts in the NMS are mainly composed of well-crystallized clay minerals
quartz
and plagioclase without the presence of Fe/Mn oxyhydroxides. It is suggested that most of the illite
kaolinite
and chlorite in both MS and NMS are likely aeolian dust in origin from South Africa continent. In addition
the abundance of kaolinite dominates the clay mineral assemblage at low latitudes
where the intensive chemical weathering of continental source rocks facilitating the formation of kaolinite. In terms of smectite
it is indicated of authigenic origin in consideration of only smectite is available in several MS and the absence in NMS. Moreover
the MS samples with only smectite available are always accompanied by goethite. Therefore
it is assumed that most of smectite occurred in studied area is the results of interaction between hydrothermal Fe-oxyhydroxide
silica
and seawater.
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