Heavy mineral stratigraphy of sediments from the southern outer shelf of the East China Sea since the last glaciation using fuzzy C-means cluster method

Xiaotong Lin; Weiran Li; Shujie Du; Zhenhong Lin

doi:10.1007/s00343-010-9292-y

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Heavy mineral stratigraphy of sediments from the southern outer shelf of the East China Sea since the last glaciation using fuzzy C-means cluster method

OriginalPaper | Updated：2023-05-16

- Heavy mineral stratigraphy of sediments from the southern outer shelf of the East China Sea since the last glaciation using fuzzy C-means cluster method
- Heavy mineral stratigraphy of sediments from the southern outer shelf of the East China Sea since the last glaciation using fuzzy C-means cluster method
- 海洋湖沼学报（英文） 2010年28卷第1期页码：183-189
- Affiliations：
  
  1. Computer Center of Ocean University of China
  2. College of Marine Geoscience Ocean University of China
- Author bio：
- Funds：
  
  Supported by the National Natural Science Foundation of China (Nos. 40176014, 40067013).
- DOI：10.1007/s00343-010-9292-y
  中图分类号：
- 网络首发：2010-01-27，
  
  纸质出版：2010
- Accepted：
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Heavy mineral stratigraphy of sediments from the southern outer shelf of the East China Sea since the last glaciation using fuzzy C-means cluster method[J]. 海洋湖沼学报（英文）, 2010,28(1):183-189.

Lin, X., Li, W., Du, S. et al. Heavy mineral stratigraphy of sediments from the southern outer shelf of the East China Sea since the last glaciation using fuzzy C-means cluster method., Chin. J. Ocean. Limnol. 28, 183–189 (2010). https://doi.org/10.1007/s00343-010-9292-y
Heavy mineral stratigraphy of sediments from the southern outer shelf of the East China Sea since the last glaciation using fuzzy C-means cluster method[J]. 海洋湖沼学报（英文）, 2010,28(1):183-189. DOI： 10.1007/s00343-010-9292-y.

Lin, X., Li, W., Du, S. et al. Heavy mineral stratigraphy of sediments from the southern outer shelf of the East China Sea since the last glaciation using fuzzy C-means cluster method., Chin. J. Ocean. Limnol. 28, 183–189 (2010). https://doi.org/10.1007/s00343-010-9292-y DOI：

摘要

Abstract

Correspondence analysis and fuzzy C-means cluster methods were used to divide the stratigraphy of heavy mineral assemblages

and the sediment sources and depositional dynamics of the environment reconstructed. The assemblages were taken from marine sediments from the late Pleistocene to the Holocene in Core Q43 situated on the outer shelf of the East China Sea. Based on the variable boundaries of the mineral assemblage at 63 and 228 cmbsf (cm below sea floor)

the core might have previously been divided into three sediment strata marked with units I

II and III

which would be consistent with the divided sediment stratum of the core using minor element geochemistry. The downcore distribution of heavy minerals divided the sedimentary sequence into three major units

which were further subdivided into four subunits. The interval between 0 and 63 cmbsf of the core (unit I)

which spans the Holocene and the uppermost late Pleistocene

is characterized by a hornblende-epidote-pyroxene assemblage

and contains relatively a smaller amount of schistic mineral and authigenic pyrite. In comparison

the interval between 63 and 228 cmbsf (unit II)

is representative of the Last Glacial Maximum (LGM)

and features a hornblende-epidote-magnetite-ilmenite assemblage containing the highest concentrations of heavy minerals and opaque minerals. However

the interval between 228 and 309 cmbsf (unit III)

which spans the subinterglacial period

is characterized by a hornblende-authigenic-pyrite-mica assemblage. Relative ratios of some heavy minerals can be used as tracers of clastic sediment sources. The lower part of the sediment core shows the highest magnetite/ilmenite ratio and relatively high hornblende/augite and hornblende/epidote ratios. The middle core shows the highest hornblende/augite and hornblende/epidote ratios

and the lowest magnetite/ilmenite ratio. The upper part exhibits a slightly higher magnetite/ilmenite ratio

and also the lowest hornblende/augite and hornblende/epidote ratios. The distribution of the mineral ratio is consistent with stratigraphic division in heavy mineral data using correspondence analysis and fuzzy C-means clustering. Variations in heavy mineral association and mineral ratio in core Q43 revealed changes in provenance and depositional environment of the southern outer shelf of the East China Sea since the late Pleistocene

well corresponding to interglacial and glacial cycles.

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