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Assessment of the Effect of Organic Matter on Rare Earth Elements and Yttrium Using the Zhijin Early Cambrian Phosphorite as an Example
| Content Provider | MDPI |
|---|---|
| Author | Wu, Shengwei Yang, Haiying Fan, Haifeng Xia, Yong Meng, Qingtian He, Shan Gong, Xingxiang |
| Copyright Year | 2022 |
| Description | The geochemistry of rare earth elements and yttrium (REY) in phosphorite has been widely studied. However, the effect of organic matter on REY enrichment has not been well determined. We utilized paired inorganic (δ^{13}$C_{carb}$) and organic (δ^{13}$C_{carb}$) carbon isotopes, total organic carbon (TOC), and REY content (∑REY) of the Zhijin Motianchong (MTC) phosphorite and compared them with those of Meishucun (MSC) phosphorite to reveal the effect of organic matter on REY. The δ^{13}$C_{carb}$ of the MTC area (≈0‰) is heavier than that of the MSC area (−5.23‰ to −1.13‰), whereas δ^{13}$C_{org}$ is lighter (−33.85‰ to −26.34‰) in MTC than in MSC (−32.95‰ to −25.50‰). Decoupled δ^{13}$C_{carb}$ and δ^{13}$C_{org}$ in MTC indicate the contribution of chemoautotrophic organisms or methanotrophic bacteria. Compared to the MSC phosphorite, the MTC phosphorite has higher ∑REY and TOC, and these parameters have a positive relationship. MTC phosphorite has REY patterns resembling those of contemporary organic matter. Furthermore, dolomite cement has a higher ∑REY than dolomite in the phosphorus-bearing dolostone. Additionally, pyrites are located on the surface of fluorapatite in the Zhijin phosphorites. It is reasonable to suggest that the REY was released into the pore water owing to the anaerobic oxidation of organic matter at the interface between seawater and sediment, resulting in the REY enrichment of Zhijin phosphorites. |
| Starting Page | 876 |
| e-ISSN | 2075163X |
| DOI | 10.3390/min12070876 |
| Journal | Minerals |
| Issue Number | 7 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-07-12 |
| Access Restriction | Open |
| Subject Keyword | Minerals Geochemistry and Geophysics Geology Zhijin Phosphorites Early Cambrian Carbon Isotopes Total Organic Carbon Rare Earth Elements and Yttrium Enrichment |
| Content Type | Text |
| Resource Type | Article |
