The heavy mineral assemblages of the surface sediments on the northeast shelf of the East China Sea and their environmental implication

WANG Zhongbo; YANG Shouye; ZHANG Zhixun; HE Qixiang; LAN Xianhong

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WANG Zhongbo, YANG Shouye, ZHANG Zhixun, HE Qixiang, LAN Xianhong. The heavy mineral assemblages of the surface sediments on the northeast shelf of the East China Sea and their environmental implication[J]. Haiyang Xuebao, 2012, 34(6): 114-125.

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The heavy mineral assemblages of the surface sediments on the northeast shelf of the East China Sea and their environmental implication

1.
Key Laboratory of Ministry of Land and Natural Resources for Marine Hydrocarbon Resources and Environmental Geology, Qingdao Institute of Marine Geology, Ministry of Land and Natural Resources, Qingdao, 266071, China;State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
2.
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
3.
Key Laboratory of Ministry of Land and Natural Resources for Marine Hydrocarbon Resources and Environmental Geology, Qingdao Institute of Marine Geology, Ministry of Land and Natural Resources, Qingdao, 266071, China

Received Date: 2011-11-02
Rev Recd Date: 2012-05-17

Abstract

Abstract

The heavy mineral assemblages and grain-size compositions of 360 surface sediment samples on the northeast shelf of the East China Sea are analyzed for the study of depositional environments. An R-type cluster analysis suggests that stable minerals or opaque minerals and a heavy mineral differentiation index can discriminate the distribution patterns of detrital minerals on the shelf. Meanwhile,a K-means cluster analysis can identify three groups: relict sandy area, subaqueous prodelta of the Changjiang River and muddy belt on the inner shelf off Zhejiang and Fujiang Provinces, and the Changjiang sand sheet area. The combination of grain size, heavy minerals, ¹⁴C age and sedimentation environment primarily determines the formation of relict/reworked sediments on the mid-outer shelf and the mud distribution in the Fujian-Zhejiang coast, and sediment source to sink transport during the postglacial transgression.The results of cluster analysis clearly reveal the relation between detrital mineral compositions and hydrodynamic sorting of single-provenance sediment. However, it may cause some misleading results when complex sources exist. The surface sediments of the Changjiang tidal sand sheet are reworked tidal sand ridges with formation ages of 6~4 and 3~2 ka B.P.
- heavy mineral,
- continental shelf of East China Sea,
- surface sediment,
- grain size,
- depositional environment,
- cluster analysis

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References(39)

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