The role of F-clinohumite in volatile recycling processes in subduction zones

Grützner, Tobias; Klemme, Stephan; Rohrbach, Arno; Gervasoni, Fernanda; Berndt, Jasper

doi:10.1130/g38788.1

Cited by 35 publications

(39 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As OH-endmember humites are rare in nature, it can be assumed that the majority of natural HGM will contain appreciable quantities of fluorine and/or titanium (e.g., Jones 1969;Evans and Trommsdorff 1983;Ehlers and Hoinkes 1987;Satish-Kumar and Niimi 1998), such that natural HGM will be more stable than their OH counterparts. Grützner et al (2017) conducted high-pressure experiments to assess the upper stability limits of F-bearing HGM and found that F-bearing HGM are indeed much more stable than their OH counterparts. They showed that clinohumite with even with small quantities of F, equivalent to X F = 0.25 (~ 1.5 wt% F), is stable to 1400 °C at a pressure of 10 GPa.…”

Section: The Storage Of Fluorine and Water Within Humite-group Mineramentioning

confidence: 99%

“…1). Their stability fields may also be expanded through the incorporation of small quantities of F (Ulmer and Trommsdorff 1999;Stalder and Ulmer 2001), allowing HGM to crystallise at shallow depths of subduction and remain stable down to transition zone conditions (Grützner et al 2017). Few other hydrous silicate minerals show such ranges in pressure and temperature space.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fluorine partitioning between humite-group minerals and aqueous fluids: implications for volatile storage in the upper mantle

Hughes

Pawley

2019

Contrib Mineral Petrol

View full text Add to dashboard Cite

Phase equilibrium experiments were performed in the MgO-SiO 2-H 2 O system, along with fluorine (MSH + F), at conditions between 800-1000 °C and 2.0-2.5 GPa to constrain the solubility of fluorine in humite-group minerals and to determine fluorine partitioning between humite-group minerals and aqueous fluid. Fluorine solubility in humite-group minerals ranges between ~ 1 and 11 wt% F and is dependent on the salinity of the fluid (~ 0.2-3.5 wt% F), indicating that humitegroup minerals have exceedingly high saturation limits for F and that a full solid solution between F − and OH − is possible within the crystal structure. Raman spectroscopy reveals the preferential ordering of F, promoting the formation of a stable OH-F bond. Mineral-fluid partition coefficients are always greater than unity, with average coefficients of D F clinohumite/fluid = 3, D F humite/fluid = 2, D F chondrodite/fluid = 4, and D F norbergite/fluid = 4. Partition coefficients are independent of pressure or temperature, but decrease with increasing fluid salinity. Fluorine is, therefore, highly soluble and compatible within this group of ultramafic mantle minerals. High solubility and mineral-fluid partition coefficients, together with wide stability fields in pressure and temperature space, demonstrate that humite-group minerals are potential storage sites for F, and by extension H 2 O, during subduction. Upon the breakdown of less stable hydrous and/or fluorine-rich phases during lower grades of subduction zone metamorphism, fluorine may redistribute into phases such as humite-group minerals and be transported beyond the volcanic arc and to the upper mantle.

show abstract

Section: The Storage Of Fluorine and Water Within Humite-group Mineramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fluorine partitioning between humite-group minerals and aqueous fluids: implications for volatile storage in the upper mantle

Hughes

Pawley

2019

Contrib Mineral Petrol

View full text Add to dashboard Cite

show abstract

“…It is indeed well known that the stability of clinohumite increases with the increase of its F/OH ratio, acting as carrier of volatiles and halogens into the deeper parts of the mantle (Engi and Lindsley, 1980;Trommsdorff and Evans, 1980;Evans and Trommsdorff, 1983;Weiss, 1997;Stalder and Ulmer, 2001;López Sánchez-Vizcaíno et al, 2005;John et al, 2011). The new experimental data by Grützner et al (2017) suggest that F-bearing humites could be stable even at conditions corresponding to the transition zone (up to 1800 °C at 17 GPa).…”

Section: Serpentinitesmentioning

confidence: 89%

From oceanic to continental subduction: Implications for the geochemical and redox evolution of the supra-subduction mantle

Cannaò

Malaspina

2018

Geosphere

View full text Add to dashboard Cite

Processes taking place in subduction zones are the main controller of the chemical cycle of volatile and incompatible elements in the Earth system. Meta morphic devolatilization reactions occurring during slab burial play a key role in the transfer of elements to the supra-subduction mantle, from forearc to sub-arc depth. Here, we discuss the elements released in fluids and melts from oceanic (i.e., sediments, altered oceanic crust, and hydrated lithospheric mantle) and continental slab materials during prograde subduction and the consequent implications in the chemical evolution of the supra-subduction mantle. We use bulk data and fluid and melt inclusions analyses to show and to constrain the mobility of elements from top to bottom in the subduction zone setting. The development of mélange domains at the slab-mantle interface and its influence in the element cycle are also taken into account. Coupled with trace-element mobility, we review the redox evolution of slab materials during subduction and its implication in the redox conditions of the supra-subduction mantle due to fluid and melt infiltration down to sub-arc depth.

show abstract

“…Among various hydrous minerals, the humite-group minerals on the brucite (Bru)-olivine (Ol) join have been proposed as potential carriers of H 2 O into the deep Earth and water reservoirs in the subduction zones and upper mantle under very hydrous compositions in the pressure range below 15 GPa (Kanzaki 1991 and2016;Wunder et al 1995;Wunder 1998;Berry and James 2001;Stalder and Ulmer 2001;Friedrich et al 2002;Shen et al 2015;Grützner et al 2017b). These humite-group minerals along the Bru-Ol join include norbergite (1 Bru + 1 Ol), chondrodite (1 Bru + 2 Ol), humite (1 Bru + 3 Ol), clinohumite (1 Bru + 4 Ol).…”

Section: Introductionmentioning

confidence: 99%

Crystal chemistry and high-temperature vibrational spectra of humite and norbergite: Fluorine and titanium in humite-group minerals

Liu

Hirner

Smyth

et al. 2021

American Mineralogist

View full text Add to dashboard Cite

The humite-group minerals on the brucite-olivine join may be important dense hydrous magnesium silicate (DHMS) phases in the subducting slab. Fluorine and titanium can be incorporated into the crystal structures through the substitution mechanisms (OH)-= Fand Mg 2+ + 2(OH)-= Ti 4+ + 2O 2-. These substitutions have significant effects on the hydrogen bonding behavior in their crystal structures. Crystal structure refinements and in situ high-temperature Raman and Fourier transform infrared (FTIR) measurements were conducted on natural humite and norbergite crystals. Both minerals crystallize in space group Pbnm, and the isobaric Grüneisen parameters for the lattice and SiO 4 internal vibrations are compared with those of chondrodite, clinohumite, brucite and forsterite. For the humite-group minerals, the OH-stretching modes above 3450 cm-1 are affected by local H-H repulsion, whereas the behavior of those below 3450 cm-1 can be explained by Fand Ti 4+ substitutions, either of which may relieve the H-H repulsion effect. The Raman-active OH bands below 3450 cm-1 are affected by Ti 4+ substitution, while the IR-active bands can be affected by either For Ti 4+ substitutions. Based on an analysis of the high-T Raman and FTIR spectra, the OH vibrations above and below 3450 cm-1 behave differently as a function of temperature, and similar behavior has also been observed for other dense hydrous silicate phases in the hydrous peridotite system. Hence, the lengths of the oxygen-oxygen edges in MgO 6 octahedra where protonation can occur become similar to each other at elevated temperatures. This may provide an This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America. The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.

show abstract

The role of F-clinohumite in volatile recycling processes in subduction zones

Cited by 35 publications

References 20 publications

Fluorine partitioning between humite-group minerals and aqueous fluids: implications for volatile storage in the upper mantle

Fluorine partitioning between humite-group minerals and aqueous fluids: implications for volatile storage in the upper mantle

From oceanic to continental subduction: Implications for the geochemical and redox evolution of the supra-subduction mantle

Crystal chemistry and high-temperature vibrational spectra of humite and norbergite: Fluorine and titanium in humite-group minerals

Contact Info

Product

Resources

About