Rare earth elements geochemical characteristics of natural gas hydrates in Shenhu Area of the northern South China Sea

Abstract

Abstract: The REE geochemical characteristics bear much information about the provenance and sedimentary environment of natural gas hydrate. The REE contents and patterns of the sedimentary samples from stations SHW2 and SHW7 in Shenhu Area of the northern South China Sea were analyzed by ICP-MS. The results show that the average REE contents of samples from SHW2 and SHW7 are close to average REE content in upper continental crust. Analysis on LREE and HREE shows that there are significant fractionations in sediments. The REE patterns of two stations are similar. These characteristics are close to REE pattern in the upper continental crust and post-Archean Australian shale (PAAS). It indicates that sediments of the hydrate area inherit characteristics of their provenance, which are mainly from terrigenous rocks. The profile charts of REE parameters of stations SHW2 and SHW7 show that there is much positive correlation amoung EREE,LREE and HREE,and there is negative correlation between δCe and δEu. It can be inferred that the sedimentary provenances of the two stations have similarity.

Key words: natural gas hydrate, rare earth elements(REE), geochemical characteristics, Shenhu Area, the northern South China Sea

CLC Number:

P736.4

WANG Yan-mei, HAN Bing, WU Neng-you, ZHAO Ming-hui. Rare earth elements geochemical characteristics of natural gas hydrates in Shenhu Area of the northern South China Sea[J]. Journal of Marine Sciences, 2012, 30(3): 60-68.

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