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A study of thermal decomposition of antigorite from dunite and lizardite from peridotite

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Abstract

Two varieties of serpentines, antigorite and lizardite originated from dunite and peridotite, respectively, were previously undergone heat treatment in the range from 396 to 1128 °C and then leached via an original approach to the acid processing of dehydrated serpentines. Because of unsaturated (weak) Si–O(Si) bonds existing in the serpentines structure, ortho- [SiO4]4−, di- [Si2O7]6− and other silicate units are easily leached from dehydrated serpentines in the form of soluble silicic acids along with magnesium compounds via this approach, whereas the more complex fragments largely comprised of metasilicate [(SiO3)2−]n chains remain in the unreacted mass The yields of silicic acids produced from heated serpentines are variable. The influence of thermal treatment on both the serpentinite samples was investigated by thermal, X-ray diffraction and chemical analyses. The data derived from the experimental studies allowed to reveal the distribution of primary ortho- [SiO4]4− and meta- [(SiO3)2−]n silicate units in the silicate layers inherent in these serpentine minerals and to understand its influence on the mechanism of their decomposition including the high-temperature phase transformations into forsterite Mg2SiO4 and enstatite Mg2Si2O6.

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Notes

  1. Mafic rocks have around 50% or less (55–45%) silica and a lot of magnesium and iron, and ultramafic ones contain silica less than 45%, generally more than 18% MgO.

  2. Dunite is an ultramafic plutonic igneous rock. The mineral assemblage is greater than 90% olivine (Mg,Fe)2SiO4 with minor amounts of pyroxene(Mg,Fe)2Si2O6 and other minerals (chromite and pyrope).

  3. Peridotite is an ultramafic plutonic igneous rock consisting mostly of olivine (40–90%) and pyroxene.

  4. Pyroxenite is an ultramafic plutonic igneous rock that consists of dark minerals in the pyroxene group plus a little olivine (10%).

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Acknowledgements

This work was supported by the RA MES State Committee of Science, in the frames of the research project no 16YR-1D025. Authors are very grateful to Dr. M. Mellini for providing the CHR-23 sample and information about its occurrence.

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Authors and Affiliations

  1. The Institute of General and Inorganic Chemistry of the National Academy of Sciences of the Republic of Armenia (IGIC NAS RA), Argutyan str. 10, lane 2, 0051, Yerevan, Armenia

    Nshan Zulumyan, Anna Isahakyan, Hayk Beglaryan & Stella Melikyan

  2. Armenian State Pedagogical University after Kh. Abovyan, Tigran Mets Avenue 17, 0010, Yerevan, Armenia

    Nshan Zulumyan & Stella Melikyan

  3. Yerevan State University, 1 Alex Manoogian, 0025, Yerevan, Armenia

    Hayk Beglaryan

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  1. Nshan Zulumyan
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Correspondence to Nshan Zulumyan.

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Zulumyan, N., Isahakyan, A., Beglaryan, H. et al. A study of thermal decomposition of antigorite from dunite and lizardite from peridotite. J Therm Anal Calorim 131, 1201–1211 (2018). https://doi.org/10.1007/s10973-017-6705-6

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