Abstract
In order to investigate effects of the post-spinel transformation on rheological behavior of descending slabs, we conducted simultaneous deformation and eutectoid reaction experiments using an analogue reaction from albite to jadeite and quartz by a deformation-DIA apparatus. Flow stress and transformed fraction were quantitatively obtained by in-situ X-ray observations during the constant strain rate deformation. The microstructures of recovered samples as well as the flow and kinetic data suggest sequential variation of the creep mechanism from dislocation creep of the transformed eutectoid colony followed by the grain-size sensitive creep in the degenerated eutectoid structure. Our study demonstrated that the creep behavior during the eutectoid transformation involves various processes than previously thought. The slabs may not be weaken promptly after entering into the lower mantle when the size of eutectoid colony is enough large, and keep their strength (or harden) over a period of time depending on the degeneration kinetics of the colony.
| Original language | English |
|---|---|
| Pages (from-to) | 92-97 |
| Number of pages | 6 |
| Journal | Earth and Planetary Science Letters |
| Volume | 388 |
| DOIs | |
| Publication status | Published - Feb 15 2014 |
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All Science Journal Classification (ASJC) codes
- Geophysics
- Geochemistry and Petrology
- Earth and Planetary Sciences (miscellaneous)
- Space and Planetary Science
Cite this
Creep behavior during the eutectoid transformation of albite : Implications for the slab deformation in the lower mantle. / Doi, Naoko; Kato, Takumi; Kubo, Tomoaki; Noda, Masahiko; Shiraishi, Rei; Suzuki, Akio; Ohtani, Eiji; Kikegawa, Takumi.
In: Earth and Planetary Science Letters, Vol. 388, 15.02.2014, p. 92-97.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Creep behavior during the eutectoid transformation of albite
T2 - Implications for the slab deformation in the lower mantle
AU - Doi, Naoko
AU - Kato, Takumi
AU - Kubo, Tomoaki
AU - Noda, Masahiko
AU - Shiraishi, Rei
AU - Suzuki, Akio
AU - Ohtani, Eiji
AU - Kikegawa, Takumi
PY - 2014/2/15
Y1 - 2014/2/15
N2 - In order to investigate effects of the post-spinel transformation on rheological behavior of descending slabs, we conducted simultaneous deformation and eutectoid reaction experiments using an analogue reaction from albite to jadeite and quartz by a deformation-DIA apparatus. Flow stress and transformed fraction were quantitatively obtained by in-situ X-ray observations during the constant strain rate deformation. The microstructures of recovered samples as well as the flow and kinetic data suggest sequential variation of the creep mechanism from dislocation creep of the transformed eutectoid colony followed by the grain-size sensitive creep in the degenerated eutectoid structure. Our study demonstrated that the creep behavior during the eutectoid transformation involves various processes than previously thought. The slabs may not be weaken promptly after entering into the lower mantle when the size of eutectoid colony is enough large, and keep their strength (or harden) over a period of time depending on the degeneration kinetics of the colony.
AB - In order to investigate effects of the post-spinel transformation on rheological behavior of descending slabs, we conducted simultaneous deformation and eutectoid reaction experiments using an analogue reaction from albite to jadeite and quartz by a deformation-DIA apparatus. Flow stress and transformed fraction were quantitatively obtained by in-situ X-ray observations during the constant strain rate deformation. The microstructures of recovered samples as well as the flow and kinetic data suggest sequential variation of the creep mechanism from dislocation creep of the transformed eutectoid colony followed by the grain-size sensitive creep in the degenerated eutectoid structure. Our study demonstrated that the creep behavior during the eutectoid transformation involves various processes than previously thought. The slabs may not be weaken promptly after entering into the lower mantle when the size of eutectoid colony is enough large, and keep their strength (or harden) over a period of time depending on the degeneration kinetics of the colony.
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UR - http://www.scopus.com/inward/citedby.url?scp=84890650989&partnerID=8YFLogxK
U2 - 10.1016/j.epsl.2013.09.009
DO - 10.1016/j.epsl.2013.09.009
M3 - Article
AN - SCOPUS:84890650989
VL - 388
SP - 92
EP - 97
JO - Earth and Planetary Science Letters
JF - Earth and Planetary Science Letters
SN - 0012-821X
ER -