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Open AccessArticle

Formation of Spessartine and CO2 via Rhodochrosite Decarbonation along a Hot Subduction P-T Path

1
Sobolev Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia
2
Department of Geology and Geophysics, Novosibirsk State University, 630090 Novosibirsk, Russia
*
Authors to whom correspondence should be addressed.
Minerals 2020, 10(8), 703; https://doi.org/10.3390/min10080703
Received: 13 July 2020 / Revised: 1 August 2020 / Accepted: 5 August 2020 / Published: 7 August 2020
(This article belongs to the Special Issue Behaviour of Volatiles and Fluid-Mobile Elements in Subduction Zones)
Experimental simulation of rhodochrosite-involving decarbonation reactions resulting in the formation of spessartine and CO2-fluid was performed in a wide range of pressures (P) and temperatures (T) corresponding to a hot subduction P-T path. Experiments were carried out using a multi-anvil high-pressure apparatus of a “split-sphere” type (BARS) in an MnCO3–SiO2–Al2O3 system (3.0–7.5 GPa, 850–1250 °C and 40–100 h.) with a specially designed high-pressure hematite buffered cell. It was experimentally demonstrated that decarbonation in the MnCO3–SiO2–Al2O3 system occurred at 870 ± 20 °C (3.0 GPa), 1070 ± 20 °C (6.3 GPa), and 1170 ± 20 °C (7.5 GPa). Main Raman spectroscopic modes of the synthesized spessartine were 349–350 (R), 552(υ2), and 906–907 (υ1) cm−1. As evidenced by mass spectrometry (IRMS) analysis, the fluid composition corresponded to pure CO2. It has been experimentally shown that rhodochrosite consumption to form spessartine + CO2 can occur at conditions close to those of a hot subduction P-T path but are 300–350 °C lower than pyrope + CO2 formation parameters at constant pressures. We suppose that the presence of rhodocrosite in the subducting slab, even as solid solution with Mg,Ca-carbonates, would result in a decrease of the decarbonation temperatures. Rhodochrosite decarbonation is an important reaction to explain the relationship between Mn-rich garnets and diamonds with subduction/crustal isotopic signature. View Full-Text
Keywords: spessartine; CO2 fluid; rhodochrosite; manganese; decarbonation; subduction; mantle; high-pressure experiment spessartine; CO2 fluid; rhodochrosite; manganese; decarbonation; subduction; mantle; high-pressure experiment
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MDPI and ACS Style

Bataleva, Y.V.; Kruk, A.N.; Novoselov, I.D.; Palyanov, Y.N. Formation of Spessartine and CO2 via Rhodochrosite Decarbonation along a Hot Subduction P-T Path. Minerals 2020, 10, 703. https://doi.org/10.3390/min10080703

AMA Style

Bataleva YV, Kruk AN, Novoselov ID, Palyanov YN. Formation of Spessartine and CO2 via Rhodochrosite Decarbonation along a Hot Subduction P-T Path. Minerals. 2020; 10(8):703. https://doi.org/10.3390/min10080703

Chicago/Turabian Style

Bataleva, Yuliya V.; Kruk, Aleksei N.; Novoselov, Ivan D.; Palyanov, Yuri N. 2020. "Formation of Spessartine and CO2 via Rhodochrosite Decarbonation along a Hot Subduction P-T Path" Minerals 10, no. 8: 703. https://doi.org/10.3390/min10080703

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