Thermoelastic properties of K0.7Na0.3AlSi3O8 hollandite and NaAlSi2O6 jadeite: Implication for the fate of the subducted continental crust in the deep mantle

Steeve Gréaux, Youmo Zhou, Yoshio Kono, Akihiro Yamada, Yuji Higo, Tetsuo Irifune

研究成果: Contribution to journalArticle査読

抄録

The thermoelastic properties of K0.7Na0.3AlSi3O8 hollandite and NaAlSi2O6 jadeite, synthesized from a (K, Na)-felspar (microcline), were investigated by a combination of in situ energy dispersive synchrotron X-ray radiation and multi-anvil techniques at high pressure (P) and temperature (T) up to 21 GPa and 1700 K. The second-order phase transformation was found to occur in hollandite at ~16 GPa from tetragonal I/4m (hollandite-I) to monoclinic I2/m (hollandite-II), which confirms the previous report that the incorporation of Na in the hollandite structure decreases the transformation pressure. Fitting the pressure–volume–temperature data to the Birch–Murnaghan equation of state yielded estimates of the thermoelastic parameters for jadeite as well as the K0.7Na0.3AlSi3O8 hollandite-I and-II phases, which indicate that the incorporation of Na is likely to decrease the bulk moduli of both hollandite phases. The obtained thermoelastic parameters were combined with those of other mantle minerals reported previously to estimate the density of continental materials along an average mantle geotherm. Based on our results, continental crust and sediment become, respectively, 11% and 15% denser than the pyrolitic mantle at pressure >10 GPa, suggesting that once pulled down to the critical depth of ~300 km, the continental portions of the slab can subduct further into the deep mantle, down to the lowermost part of the mantle transition region.

本文言語英語
論文番号261
ジャーナルMinerals
10
3
DOI
出版ステータス出版済み - 3 2020
外部発表はい

All Science Journal Classification (ASJC) codes

  • 地盤工学および土木地質学
  • 地質学

フィンガープリント

「Thermoelastic properties of K<sub>0.7</sub>Na<sub>0.3</sub>AlSi<sub>3</sub>O<sub>8</sub> hollandite and NaAlSi<sub>2</sub>O<sub>6</sub> jadeite: Implication for the fate of the subducted continental crust in the deep mantle」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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