TY - JOUR

T1 - Volatiles During the Crystallization of Olivine from Meimechites of the Guli Pluton, Maimecha-Kotui Province: Pyrolysis-Free Gas Chromatography–Mass Spectrometry Data

AU - Panina, L. I.

AU - Rokosova, E. Yu

AU - Isakova, A. T.

AU - Sharygin, V. V.

AU - Tomilenko, A. A.

AU - Bul’bak, T. A.

N1 - Panina, L.I., Rokosova, E.Y., Isakova, A.T. et al. Volatiles During the Crystallization of Olivine from Meimechites of the Guli Pluton, Maimecha-Kotui Province: Pyrolysis-Free Gas Chromatography–Mass Spectrometry Data. Petrology 33, 618–629 (2025). https://doi.org/10.1134/S0869591125700250 This work was supported by state assignment project (No. 122041400312-2) of the Sobolev Institute of Geology and Mineralogy.

PY - 2025/12/3

Y1 - 2025/12/3

N2 - The volatile content of syngenetic melt and fluid inclusions in olivine phenocrysts (Fo92–89) from meimechites of the Guli alkaline-ultrabasic carbonatite pluton was studied using gas chromatography–mass spectrometry (GC–MS). The melt inclusions in olivine were fine-crystallized. According to scanning electron microscope study, daughter phases in them were represented by diopside, phlogopite, ilmenite, Ti-bearing magnetite, titanite, nepheline, sodalite, and xenogenic chromite. According to Raman spectrometry, the fluid inclusions were low-density and contained magnesite and water. During heating experiments, after melting of the last transparent daughter phase in melt inclusions at about 1300°C, the volume of the gas phase coexisting with the melt varied from 1/4 to 2/3 of the inclusion volume, indicating its heterogeneous trapping, i.e. heterogeneity of mineral-forming environment. During olivine crystallization, the volatiles were predominantly represented by hydrocarbons (83.0 rel. %), nitrogenated (7.2 rel. %) and sulfonated (3.4 rel. %) compounds, as well as H2O (5.9 rel. %) and CO2 (0.3 rel. %). The hydrocarbons and sulfonated compounds include the relatively high amount of halogenated compounds (4.0 rel. %). The species diversity of the volatile components amounted 201 chemical compounds. The hydrocarbons were dominated by oxygenated components (74.5 rel. %), which include 34.0 rel. % alcohols and 9.9 rel. % ethers, 11.4 rel. % aldehydes, 6.8 rel. % ketones, and 12.2 rel. % carboxylic acids. Aliphatic and cyclic hydrocarbons accounted for only 4.6 and 3.7 rel. %, respectively. Olivine crystallized at relatively reducing conditions at H/(H + O) = 0.87. The comparison of the obtained data with data on olivine from olivinites of the Krestovskaya intrusion showed that meimechites cannot be the parental magma for olivinites of alkaline-ultrabasic carbonatite massifs.

AB - The volatile content of syngenetic melt and fluid inclusions in olivine phenocrysts (Fo92–89) from meimechites of the Guli alkaline-ultrabasic carbonatite pluton was studied using gas chromatography–mass spectrometry (GC–MS). The melt inclusions in olivine were fine-crystallized. According to scanning electron microscope study, daughter phases in them were represented by diopside, phlogopite, ilmenite, Ti-bearing magnetite, titanite, nepheline, sodalite, and xenogenic chromite. According to Raman spectrometry, the fluid inclusions were low-density and contained magnesite and water. During heating experiments, after melting of the last transparent daughter phase in melt inclusions at about 1300°C, the volume of the gas phase coexisting with the melt varied from 1/4 to 2/3 of the inclusion volume, indicating its heterogeneous trapping, i.e. heterogeneity of mineral-forming environment. During olivine crystallization, the volatiles were predominantly represented by hydrocarbons (83.0 rel. %), nitrogenated (7.2 rel. %) and sulfonated (3.4 rel. %) compounds, as well as H2O (5.9 rel. %) and CO2 (0.3 rel. %). The hydrocarbons and sulfonated compounds include the relatively high amount of halogenated compounds (4.0 rel. %). The species diversity of the volatile components amounted 201 chemical compounds. The hydrocarbons were dominated by oxygenated components (74.5 rel. %), which include 34.0 rel. % alcohols and 9.9 rel. % ethers, 11.4 rel. % aldehydes, 6.8 rel. % ketones, and 12.2 rel. % carboxylic acids. Aliphatic and cyclic hydrocarbons accounted for only 4.6 and 3.7 rel. %, respectively. Olivine crystallized at relatively reducing conditions at H/(H + O) = 0.87. The comparison of the obtained data with data on olivine from olivinites of the Krestovskaya intrusion showed that meimechites cannot be the parental magma for olivinites of alkaline-ultrabasic carbonatite massifs.

KW - GC–MS analysis

KW - Guli pluton

KW - fluid and melt inclusions

KW - meimechites

KW - olivine

KW - volatile component

KW - Guli pluton

KW - meimechites

KW - olivine

KW - volatile component

KW - fluid and melt inclusions

KW - GC–MS analysis

UR - https://www.mendeley.com/catalogue/38cdc5bc-180f-3b19-a74d-be506bf51b96/

UR - https://www.scopus.com/pages/publications/105023970051

U2 - 10.1134/S0869591125700250

DO - 10.1134/S0869591125700250

M3 - Article

VL - 33

SP - 618

EP - 629

JO - Petrology

JF - Petrology

SN - 0869-5911

IS - 6

ER -