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Minerals
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Fe-Bearing Carbonates in the Deep Earth
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Fe-Bearing Carbonates in the Deep Earth

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Crystallography and Physical Chemistry of Minerals & Nanominerals".

Deadline for manuscript submissions: closed (20 December 2020) | Viewed by 16604

Special Issue Editors

Dr. Valerio Cerantola

E-Mail Website
Guest Editor
European X-Ray Free-Electron Laser Facility, Holzkoppel 4, 22869 Schenefeld, Germany
Interests: mineral physics; extreme conditions; deep carbon cycle
Dr. Eglantine Boulard

E-Mail Website
Guest Editor
CNRS, Sorbonne Université, Muséum National dʹHistoire Naturelle, UMR CNRS 7590, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, 75005 Paris, France
Interests: mineral physics; deep Earth mineralogy; deep volatile cycles

Special Issue Information

Dear Colleagues,

Carbonate minerals are considered to be the major source of carbon influx inside the deep Earth. They can be found as inclusions in natural diamonds coming from the deep mantle. Recent experimental investigations demonstrate their ability to transform into highly polymerized tetracarbonate structures at pressures and temperatures of the lowermost mantle. In particular, the study of Fe-carbonates at extreme conditions has attracted considerable interest in the last decade. Multiple valence states and magnetism, such as the electronic spin pairing of iron 3d electrons, result in a rich physics and chemistry of Fe-carbonates at extreme conditions. Moreover, recent experiments in multi-phase systems, where Fe-carbonates were subjected to extreme conditions in the presence of silicates, has revealed a more complex and intriguing system than previously thought.

We cordially invite you to contribute to this Special Issue, “Iron bearing carbonate in the deep Earth”, which will cover topics such as:

  • (Redox)-reactions in multi-phase systems containing Fe-carbonates;
  • Vibrational properties of Fe-carbonates at extreme conditions;
  • Fe-carbonate melts of chemical and physical properties at extreme conditions, i.e., structure, density, and viscosity;
  • Stability of Fe-bearing carbonates at high pressure and temperature, decomposition, and phase transformation;
  • Synthesis of Fe-carbonates at extreme conditions.

Dr. Valerio Cerantola
Dr. Eglantine Boulard
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Minerals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Fe-carbonates
  • Fe-carbonate melts
  • deep carbon cycle
  • Earth’s mantle
  • redox reactions
  • extreme conditions
  • mineral physics

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Published Papers (2 papers)

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Research

17 pages, 4129 KiB  
Article
Iron(II)oxalate Dihydrate—Humboldtine: Synthesis, Spectroscopic and Structural Properties of a Versatile Precursor for High Pressure Research
by Harald Müller, Léa Bourcet and Michael Hanfland
Minerals 2021, 11(2), 113; https://doi.org/10.3390/min11020113 - 23 Jan 2021
Cited by 18 | Viewed by 12768
Abstract
Iron(II)oxalate dihydrate FeC2O4 × 2 H2O—humboldtine is not only an important synthetic intermediate, but also a key building block for the preparation of various advanced materials. Interestingly, FeC2O4 × 2 H2O can be [...] Read more.
Iron(II)oxalate dihydrate FeC2O4 × 2 H2O—humboldtine is not only an important synthetic intermediate, but also a key building block for the preparation of various advanced materials. Interestingly, FeC2O4 × 2 H2O can be transformed readily into phase-pure siderite FeCO3. The importance of siderite for earth sciences, in particular for the understanding of the deep carbon cycle of our planet, is paramount. The availability of high-quality single crystals of FeC2O4 × 2 H2O is crucial for diffraction or spectroscopic studies at high pressure. The present article describes a versatile synthetic approach to single crystals of FeC2O4 × 2 H2O and its deuterated analogue starting from metallic iron together with a complete characterization of the products obtained. The same protocol has been employed successfully for the preparation of 57FeC2O4 × 2 H2O, as required for Möβbauer spectroscopy. In addition, the pressure-dependence of the crystal and molecular structure of the title compound was investigated up to p ≥ 20 GPa. Full article
(This article belongs to the Special Issue Fe-Bearing Carbonates in the Deep Earth)
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14 pages, 4352 KiB  
Article
Phase Stability and Vibrational Properties of Iron-Bearing Carbonates at High Pressure
by Chaoshuai Zhao, Liangxu Xu, Weibin Gui and Jin Liu
Minerals 2020, 10(12), 1142; https://doi.org/10.3390/min10121142 - 20 Dec 2020
Cited by 19 | Viewed by 3186
Abstract
The spin transition of iron can greatly affect the stability and various physical properties of iron-bearing carbonates at high pressure. Here, we reported laser Raman measurements on iron-bearing dolomite and siderite at high pressure and room temperature. Raman modes of siderite FeCO3 [...] Read more.
The spin transition of iron can greatly affect the stability and various physical properties of iron-bearing carbonates at high pressure. Here, we reported laser Raman measurements on iron-bearing dolomite and siderite at high pressure and room temperature. Raman modes of siderite FeCO3 were investigated up to 75 GPa in the helium (He) pressure medium and up to 82 GPa in the NaCl pressure medium, respectively. We found that the electronic spin-paring transition of iron in siderite occurred sharply at 42–44 GPa, consistent with that in the neon (Ne) pressure medium in our previous study. This indicated that the improved hydrostaticity from Ne to He had minimal effects on the spin transition pressure. Remarkably, the spin crossover of siderite was broadened to 38–48 GPa in the NaCl pressure medium, due to the large deviatoric stress in the sample chamber. In addition, Raman modes of iron-bearing dolomite Ca1.02Mg0.76Fe0.20Mn0.02(CO3)2 were explored up to 58 GPa by using argon as a pressure medium. The sample underwent phase transitions from dolomite-Ⅰ to -Ⅰb phase at ~8 GPa, and then to -Ⅱ at ~15 and -Ⅲb phase at 36 GPa, while no spin transition was observed in iron-bearing dolomite up to 58 GPa. The incorporation of FeCO3 by 20 mol% appeared to marginally decrease the onset pressures of the three phase transitions aforementioned for pure dolomite. At 55–58 GPa, the ν1 mode shifted to a lower frequency at ~1186 cm−1, which was likely associated with the 3 + 1 coordination in dolomite-Ⅲb. These results shed new insights into the nature of iron-bearing carbonates at high pressure. Full article
(This article belongs to the Special Issue Fe-Bearing Carbonates in the Deep Earth)
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