南海东部次海盆U1431站位中中新世以来的沉积物来源特征

刘雪松; 陈雪刚; 孙凯; 李春峰

doi:10.3799/dqkx.2020.290

Volume 46 Issue 3

Mar. 2021

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Liu Xuesong, Chen Xuegang, Sun Kai, Li Chunfeng, 2021. Provenance of U1431 Sediments from the Eastern Subbasin of the South China Sea since Middle Miocene. Earth Science, 46(3): 1008-1022. doi: 10.3799/dqkx.2020.290

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Liu Xuesong, Chen Xuegang, Sun Kai, Li Chunfeng, 2021. Provenance of U1431 Sediments from the Eastern Subbasin of the South China Sea since Middle Miocene. Earth Science, 46(3): 1008-1022. doi: 10.3799/dqkx.2020.290

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Provenance of U1431 Sediments from the Eastern Subbasin of the South China Sea since Middle Miocene

doi: 10.3799/dqkx.2020.290

Ocean College, Zhejiang University, Zhoushan 316021, China

Received Date: 2020-06-18
Publish Date: 2021-03-15

Abstract

Abstract

The sedimentary records of the east subbasin in the South China Sea reflect the weathering and evolution history of sediments since the Middle Miocene. We have analyzed the major, trace elements, and Sr-Nd isotopes of the sediments from the International Ocean Discovery Program (IODP) expedition 349 site U1431. The chemical weathering index of alteration (CIA) ranges from 49 to 74, indicating a low to moderate chemical weathering degree of the provenance. The chemical weathering trend shows the preferential leaching of plagioclase. The samples from units Ⅵ, Ⅶ and 55X-2 layer containing pyroclast are affected by the input of mafic materials, while the provenance of other samples is mainly felsic end-members. Sr and Nd isotopes show significant changes in the provenance of the sediments at U1431 site. By analyzing the Sr-Nd isotopic characteristics of sediments from U1431 site and surrounding potential provenance, we inferred the sediments at U1431 site were probably mainly from the Pear River and slightly from the Indochina Peninsula, Luzon and Palawan since 12.8 Ma. Several samples show positive ε_Nd and low ⁸⁶Sr/⁸⁷Sr which may be related to the multiple volcanic activities in the study area during 12.5-7.4 Ma. After 6.5 Ma, the terrestrial material formed in the uplifting and erosion of Taiwan Island entered the central basin. Thus, Taiwan Island became one of the main sources.
- South China Sea,
- the eastern subbasin,
- ocean drilling,
- sediment,
- chemical weathering,
- provenance,
- marine geology

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Provenance of U1431 Sediments from the Eastern Subbasin of the South China Sea since Middle Miocene

doi: 10.3799/dqkx.2020.290

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