Solubility of hydroxyl groups in pyroxenes: Effect of oxygen fugacity at 0.2–3 GPa and 800–1200 °C

Liu, Hanyong; Yang, Xiaozhi

doi:10.1016/j.gca.2020.07.034

Cited by 13 publications

(23 citation statements)

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“…Water content of annealed samples, e.g., the solubility of OH at water-saturated conditions, broadly increases with temperature and pressure (Table 1), in agreement with reported trends for other pyroxenes (Liu and Yang, 2020), but differs between samples showing type 1 (142-325 ppm) versus type 2 (710-1688 ppm) spectra.…”

Section: Resultssupporting

confidence: 86%

“…S4). At given conditions, OH patterns (not contents) are similar using either the NNO or IW buffer, implying a minor redox effect, as reported also for other pyroxenes (Liu and Yang, 2020).…”

Section: Resultssupporting

confidence: 78%

“…S1). Grains were loaded, along with eclogite powder, NiO, and 2-3 wt% distilled water, into thick-walled Ni capsules (inner diameter 4.2 mm, outer diameter 5 mm, and length 10 mm; Yang, 2015Yang, , 2016Liu and Yang, 2020) and were annealed at 1-3 GPa and 600-1100 °C in a piston cylinder press with temperature measured by a type S thermocouple. The temperature gradient over the sample length was <25 °C ).…”

Section: Experiments and Methodsmentioning

confidence: 99%

“…Duration was 36-310 h depending on temperature, and longer runs at otherwise the same conditions were also carried out (Table 1). Following previous work (Kohlstedt et al, 1996;Yang, 2015Yang, , 2016Liu and Yang, 2020), sample chemistry was maintained so that the nonchemical effect on OH incorporation could be assessed. In particular, this is meaningful for massif eclogites because their mineral composition at peak metamorphism can be retained during exhumation.…”

Section: Experiments and Methodsmentioning

confidence: 99%

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Water in omphacite fingerprints the thermal history of eclogites

Jiang

Liu

Skogby

et al. 2021

Geology

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Omphacite is a diagnostic mineral of high- and ultrahigh-pressure rocks, and its association with garnet is characteristic of eclogites from subduction-related massifs and volcano-entrained xenoliths. Omphacite can accommodate significant amounts of water as structurally bound hydroxyl (OH) groups, and is able to convey water into Earth’s interior. We show, for the first time, experimental evidence that the infrared absorption patterns of water in omphacite are temperature sensitive. This provides a new framework for discriminating water in natural omphacite equilibrated at different temperatures. We also demonstrate that in low-temperature omphacite, the integral absorbance ratio between the infrared OH absorption bands at 3620 cm–1 and 3450 cm–1 is linearly related to temperature. Water in omphacite of massif eclogites records the temperature of OH equilibrium, allowing reconstruction of the fluid-involved thermal history and tectonics of rock evolution.

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Section: Resultssupporting

confidence: 86%

Section: Resultssupporting

confidence: 78%

Section: Experiments and Methodsmentioning

confidence: 99%

Section: Experiments and Methodsmentioning

confidence: 99%

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Water in omphacite fingerprints the thermal history of eclogites

Jiang

Liu

Skogby

et al. 2021

Geology

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“…H 2 O solubility in Fe-free wadsleyite was also investigated for comparison. Note that oxygen fugacity (f O2 ) may affect H 2 O solubility in upper mantle minerals (Liu & Yang, 2020;Yang, 2016). However, as we investigated recently (Druzhbin et al, 2021), H 2 O solubility in Fe-free wadsleyite is independent from f O2 .…”

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confidence: 80%

Water Solubility in Fe‐Bearing Wadsleyite at Mantle Transition Zone Temperatures

Fei

Katsura

2021

Geophysical Research Letters

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H o w e ve r, th e so lu b ility o f H 2O in Fe -b e arin g w ad sleyite is p o o rly co n strain e d co m p are d w ith rin gw o o d ite an d Fe-fre e w ad sleyite , w h ich h ave b e en exte n sive ly investigated . T h e exact H 2O sto rage cap acity of th e m an tle tran sitio n zo n e th e refo re re m ain s u n kn o w n . H e re w e inve stigate d th e so lu b ility of H 2O in Fe -b e arin g w ad sleyite as a fu n ction o f te m p e ratu re . T h e re su lts in d icate th at w ad sleyite can store ~1 .0 w t.% H 2O at tran sitio n zo n e te m p e ratu re s an d ~0 .6 5 w t.% alon g a p lu m e ge o th erm . H 2O so lu b ility in w ad sleyite is lo w e r th an th at in rin gw o o d ite in m antle p lu m e s. A d e hyd ration m e ltin g layer at th e 52 0 -km d isco n tin u ity n e ar p lu m e s can th erefore fo rm via th e p h ase tran sitio n fro m rin gw o o d ite to w ad sleyite u n d er H 2O -satu rated co n d itio n s d rive n b y u p w e llin g flo w in m antle p lu m e s. K e y w o r d s : M an tle tran sition zo n e; H 2O so lu b ility; Fe-b e arin g w ad sle yite K e y p o i n t s : H 2O so lu b ility in Fe-b e arin g w ad sle yite d e cre ase s w ith in creasin g te m p e ratu re . Fe -b e arin g w ad sle yite can co n tain ~1 .0 w t.% H 2O at m an tle tran sitio n zon e te m p e ratu re . D e h yd ration m e ltin g co u ld o ccu r at th e 52 0 -km d isco n tin u ity b y u p w e llin g flo w n e ar p lu m e s. 1 . I n t r o d u c t i o n W ad sleyite, w ith a ch e m ical fo rm u la o f (M g ,Fe )2SiO 4, is th e d o m in an t m in e ral in th e u p p e r p art of th e m antle tran sition zon e fro m 41 0 to 5 20 km d ep th . B e cau se w ad sleyite can co ntain u p to ~3 .0 w t.% H 2O as hyd roxyl in its crystal stru ctu re (Ko h lste d t et al., 1 9 96 ; Sm yth et al., 19 8 7 ; 1 99 4 ), th e tran sitio n zo n e is co n sid e red to b e a sp on ge in th e Earth 's in terio r. Th e p re se n ce o f H 2O can Accepted ArticleThis article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

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Redox geodynamics in Earth’s interior

Yang

Liu

Zhang

2022

Sci. China Earth Sci.

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Solubility of hydroxyl groups in pyroxenes: Effect of oxygen fugacity at 0.2–3 GPa and 800–1200 °C

Cited by 13 publications

References 104 publications

Water in omphacite fingerprints the thermal history of eclogites

Water in omphacite fingerprints the thermal history of eclogites

Water Solubility in Fe‐Bearing Wadsleyite at Mantle Transition Zone Temperatures

Redox geodynamics in Earth’s interior

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Solubility of hydroxyl groups in pyroxenes: Effect of oxygen fugacity at 0.2–3 GPa and 800–1200 °C

Cited by 13 publications

References 104 publications

Water in omphacite fingerprints the thermal history of eclogites

Water in omphacite fingerprints the thermal history of eclogites

Water Solubility in Fe‐Bearing Wadsleyite at Mantle Transition Zone Temperatures

Redox geodynamics in Earth’s interior

Contact Info

Product

Resources

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Solubility of hydroxyl groups in pyroxenes: Effect of oxygen fugacity at 0.2–3 GPa and 800–1200 °C