DOI: 10.1002/2014GL060060
论文题名: The postspinel boundary in pyrolitic compositions determined in the laser-heated diamond anvil cell
作者: Ye Y. ; Gu C. ; Shim S.-H. ; Meng Y. ; Prakapenka V.
刊名: Geophysical Research Letters
ISSN: 0094-10625
EISSN: 1944-10356
出版年: 2014
卷: 41, 期: 11 起始页码: 3833
结束页码: 3841
语种: 英语
英文关键词: Clapeyron slope
; the 660-km seismic discontinuity
; the post-spinel boundary
Scopus关键词: Experimental mineralogy
; X ray diffraction
; Clapeyron slope
; In-situ synchrotrons
; Laser-heated diamond anvil cells
; Multi-anvil press
; Pyrolitic composition
; Seismic discontinuities
; the post-spinel boundary
; Transition pressure
; Seismology
; discontinuity
; mineral property
; pressure effect
; pyrolite
; seismic method
; X-ray diffraction
英文摘要: In situ multianvil press (MAP) studies have reported that the depth and the Clapeyron slope of the postspinel boundary are significantly less than those of the 660 km discontinuity inferred from seismic studies. These results have raised questions about whether the postspinel transition is associated with the discontinuity. We determined the postspinel transition in pyrolitic compositions in the laser-heated diamond anvil cell (LHDAC) combined with in situ synchrotron X-ray diffraction. The Clapeyron slope was determined to be -2.5 ± 0.4MPa/K and did not vary significantly with compositions and used pressure scales. Using Pt scales, our data indicate that the postspinel transition occurs in pyrolitic compositions at 23.6-24.5GPa (1850K). The transition pressure and slope are consistent with the depth and topography of the 660 km discontinuity. Our data reveal that inaccuracy in pressure scales alone cannot explain the discrepancy and technical differences between MAP and LHDAC contribute significantly to the discrepancy. © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84902034942&doi=10.1002%2f2014GL060060&partnerID=40&md5=6f1b51f9783cad133fe2b1d7396f0880
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7889
Appears in Collections: 气候减缓与适应
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作者单位: School of Earth and Space Exploration, Arizona State University, Tempe, AZ, United States
Recommended Citation:
Ye Y.,Gu C.,Shim S.-H.,et al. The postspinel boundary in pyrolitic compositions determined in the laser-heated diamond anvil cell[J]. Geophysical Research Letters,2014-01-01,41(11).