Provenance studies on sandy sediments on the northeastern shelf of the South China Sea based on heavy mineral geochemistry

Ma Yikai; Li Gang; Yan Wen

doi:10.3969/j.issn.0253-4193.2020.07.009

Volume 42 Issue 7

Nov. 2020

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Ma Yikai，Li Gang，Yan Wen. Provenance studies on sandy sediments on the northeastern shelf of the South China Sea based on heavy mineral geochemistry[J]. Haiyang Xuebao，2020, 42(7)：108–118 doi: 10.3969/j.issn.0253-4193.2020.07.009

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Provenance studies on sandy sediments on the northeastern shelf of the South China Sea based on heavy mineral geochemistry

doi: 10.3969/j.issn.0253-4193.2020.07.009

Ma Yikai^{1, 2, 3
,},
Li Gang^{1, 2
,
,},
Yan Wen^{1, 2, 3}

1.
Key Laboratory of Ocean and Marginal Sea Geology, Chinese Academy of Sciences/Innovation Academy of South China Sea Ecology and Environmental Engineering, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
2.
Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2019-07-16
Rev Recd Date: 2019-09-05

Available Online: 2020-11-18

Publish Date: 2020-07-25

Abstract

Abstract

The sediment provenance is important information to study on the transport process of shelf sediments, paleo-environmental changes and the formation of heavy mineral placers on the shelf. However, most shelf sediments are heavily reworked and repeatedly sorted, which cause the difficulty in indentifying their sources. This study firstly reported the work on heavy mineral provenance on the northeastern shelf of the South China Sea by using mineral chemistry, which has been proved to be a useful method to decrease the effect of hydrodynamic sorting. The provenance of shelf sediments was inferred by comparing the mineral assemblage and mineral chemical compositions of tourmaline and garnet between six marine sediment samples on the outer shelf and six offshore and coastal samples. In the study area, tourmaline and amphibole are dominant and monazite is present in some samples. Mineral chemical composition of tourmaline suggested the Zhujiang River and Hanjiang River are two dominant sediment suppliers. Sediments from the two big rivers contain abundant tourmaline from igneous rocks with the content of about 60% which are associated with widely-spreaded granitic rocks in the South China. Some small rivers distribute within the Lianhuashan and Changle-Nanao fracture zones are characterized by the high content of metamorphic tourmaline. These sediments can be traced on the northeastern shelf of the South China Sea by using chemical composition of tourmaline, suggesting small rivers are also important sediment suppliers on this studied shelf. Garnet sourced from sharn rocks is found on the eastern most shelf. The study highlights the importance of single-mineral chemistry in judging the provenance of shelf sediments which suffer from multiple sorting and have complex sources.
- heavy mineral,
- mineral chemistry,
- provenance,
- the northeastern shelf of the South China Sea,
- paleo-drainage

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References(42)

References

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