Clay mineral distribution characteristics of surface sediments in the South Mid-Atlantic Ridge

Qiannan HU; Chuanshun LI; Baoju YANG; Xisheng FANG; Huahua LÜ; Xuefa SHI; Jihua LIU

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Clay mineral distribution characteristics of surface sediments in the South Mid-Atlantic Ridge

Geology | Updated：2024-10-12

- Clay mineral distribution characteristics of surface sediments in the South Mid-Atlantic Ridge
- Clay mineral distribution characteristics of surface sediments in the South Mid-Atlantic Ridge
- 海洋湖沼学报(英文) 2023年41卷第3期页码：897-908
- Affiliations：
  
  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
- Author bio：
  
  jihliu@fio.org.cn
- Funds：
  
  the China Ocean Mineral Resources R&D Association project(DY135-S2-2-03;DY135-S2-2-01)
- DOI：
  中图分类号：
- 收稿：2022-01-27，
  
  纸质出版：2023-05-01
- Accepted：
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Clay mineral distribution characteristics of surface sediments in the South Mid-Atlantic Ridge[J]. 海洋湖沼学报(英文), 2023,41(3):897-908.

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 mineral distribution characteristics of surface sediments in the South Mid-Atlantic Ridge[J]. 海洋湖沼学报(英文), 2023,41(3):897-908. DOI：

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. DOI：

摘要

Abstract

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.

关键词

Keywords

references

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