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| DOI | 10.2138/am-2023-8949 |
| Equation of state and structural evolution of manganese dolomite (kutnohorite) under high pressures | |
| 发表日期 | 2024 |
| ISSN | 0003-004X |
| EISSN | 1945-3027 |
| 起始页码 | 109 |
| 结束页码 | 3 |
| 卷号 | 109期号:3 |
| 英文摘要 | Understanding the structural evolution of carbonate minerals with increasing pressure is essential to decoding the role of Earth's mantle in the global carbon cycle and long-term climate change. Here, we carried out synchrotron single-crystal X-ray diffraction measurements on a natural sample of manganese dolomite [kutnohorite, Ca1.11Mn0.89(CO3)(2)] in a diamond-anvil cell up to 51.2 GPa at room temperature with neon as the pressure-transmitting medium. The manganese dolomite sample remains stable in the rhombohedral structure from 1 bar to similar to 13.3 GPa. The equation of state of Ca1.11Mn0.89(CO3)(2) was determined: V-0 = 334.06 +/- 0.29 angstrom(3), K-0 = 99.9 +/- 4.7 GPa, and K-0 ' = 4.3 +/- 0.9; when K-0 ' is fixed at 4.0, V-0 = 334.04 +/- 0.24 angstrom(3), and K-0 = 101.4 +/- 1.5 GPa. Upon further compression at room temperature, the split and disappearance of diffraction spots were observed. That is, the rhombohedral structure of manganese dolomite becomes highly distorted to lose its long-range order at 13.3-51.2 GPa at room temperature. Moreover, our single-crystal X-ray diffraction results reveal the mechanisms of the reported lattice and internal Raman mode splits of the same manganese dolomite sample approximately at 13 and 24 GPa, respectively. These results suggest manganese-bearing carbonates may play a distinct role in the deep carbon cycle. |
| 英文关键词 | High pressure; manganese dolomite; X-ray diffraction; deep carbon cycle; Physics and Chemistry of Earth's Deep Mantle and Core |
| 语种 | 英语 |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| WOS类目 | Geochemistry & Geophysics ; Mineralogy |
| WOS记录号 | WOS:001183294700009 |
| 来源期刊 | AMERICAN MINERALOGIST
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/297796 |
| 作者单位 | University of Chicago; Chinese Academy of Sciences; Institute of Geochemistry, CAS; Yanshan University |
| 推荐引用方式 GB/T 7714 | . Equation of state and structural evolution of manganese dolomite (kutnohorite) under high pressures[J],2024,109(3). |
| APA | (2024).Equation of state and structural evolution of manganese dolomite (kutnohorite) under high pressures.AMERICAN MINERALOGIST,109(3). |
| MLA | "Equation of state and structural evolution of manganese dolomite (kutnohorite) under high pressures".AMERICAN MINERALOGIST 109.3(2024). |
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