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DOI | 10.1038/s41561-019-0452-1 |
Sharp 660-km discontinuity controlled by extremely narrow binary post-spinel transition | |
Ishii, Takayuki1; Huang, Rong1; Myhill, Robert2; Fei, Hongzhan1; Koemets, Iuliia1; Liu, Zhaodong1; Maeda, Fumiya3; Yuan, Liang3; Wang, Lin1; Druzhbin, Dmitry1; Yamamoto, Takafumi4; Bhat, Shrikant1,5; Farla, Robert5; Kawazoe, Takaaki1,4; Tsujino, Noriyoshi6; Kulik, Eleonora1,5; Higo, Yuji7; Tange, Yoshinori7; Katsura, Tomoo1,8 | |
2019-10-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2019 |
卷号 | 12期号:10页码:869-+ |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; England; Japan; Peoples R China |
英文摘要 | The Earth's mantle is characterized by a sharp seismic discontinuity at a depth of 660 km that can provide insights into deep mantle processes. The discontinuity occurs over only 2 km-or a pressure difference of 0.1 GPa-and is thought to result from the post-spinel transition, that is, the decomposition of the mineral ringwoodite to bridgmanite plus ferropericlase. Existing high-pressure, high-temperature experiments have lacked the pressure control required to test whether such sharpness is the result of isochemical phase relations or chemically distinct upper and lower mantle domains. Here, we obtain the isothermal pressure interval of the Mg-Fe binary post-spinel transition by applying advanced multi-anvil techniques with in situ X-ray diffraction with the help of Mg-Fe partition experiments. It is demonstrated that the interval at mantle compositions and temperatures is only 0.01 GPa, corresponding to 250 m. This interval is indistinguishable from zero at seismic frequencies. These results can explain the discontinuity sharpness and provide new support for whole-mantle convection in a chemically homogeneous mantle. The present work suggests that distribution of adiabatic vertical flows between the upper and lower mantles can be mapped on the basis of discontinuity sharpness. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000488223800018 |
WOS关键词 | FE-MG INTERDIFFUSION ; X-RAY-DIFFRACTION ; PHASE-BOUNDARY ; SYSTEM MG2SIO4-FE2SIO4 ; POSTSPINEL TRANSFORMATIONS ; GEOPHYSICAL IMPLICATIONS ; MANTLE DISCONTINUITIES ; HIGH-PRESSURE ; TEMPERATURE ; PEROVSKITE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/187549 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Univ Bayreuth, Bayer Geoinst, Bayreuth, Germany; 2.Univ Bristol, Sch Earth Sci, Bristol, Avon, England; 3.Tohoku Univ, Grad Sch Sci, Dept Earth Sci, Sendai, Miyagi, Japan; 4.Hiroshima Univ, Grad Sch Sci, Dept Earth & Planetary Syst Sci, Higashihiroshima, Japan; 5.DESY, Hamburg, Germany; 6.Okayama Univ, Inst Study Earths Interior, Misasa, Tottori, Japan; 7.Japan Synchrotron Radiat Res Inst, Sayo, Hyogo, Japan; 8.Ctr High Pressure Sci & Technol Adv Res, Beijing, Peoples R China |
推荐引用方式 GB/T 7714 | Ishii, Takayuki,Huang, Rong,Myhill, Robert,et al. Sharp 660-km discontinuity controlled by extremely narrow binary post-spinel transition[J]. NATURE GEOSCIENCE,2019,12(10):869-+. |
APA | Ishii, Takayuki.,Huang, Rong.,Myhill, Robert.,Fei, Hongzhan.,Koemets, Iuliia.,...&Katsura, Tomoo.(2019).Sharp 660-km discontinuity controlled by extremely narrow binary post-spinel transition.NATURE GEOSCIENCE,12(10),869-+. |
MLA | Ishii, Takayuki,et al."Sharp 660-km discontinuity controlled by extremely narrow binary post-spinel transition".NATURE GEOSCIENCE 12.10(2019):869-+. |
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