Geochemistry of reduced fluids from alkaline igneous rocks of the Khibiny Pluton

Gottikh, R. P.; Pisotskii, B. I.; Кулакова, И. И.

doi:10.1134/s1028334x06020334

Cited by 6 publications

(4 citation statements)

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“…Occluded gases from the rocks and minerals were mainly extracted by mechanical sample crushing [15,16,43]. The thermal opening of fluid inclusions was rarely performed [37,77,78], particularly in light of the presence of volatile condensed organic compounds in the rocks [15,35,79].…”

Section: Methodsmentioning

confidence: 99%

“…Apparently, Salvi and Williams-Jones [30] were the first to carry out thermodynamic calculations and point out the possibility of the formation of HCGs in peralkaline complexes in this way. Later, the idea was supported by other authors [35,37,40,[80][81][82]. FTTR are capable of self-sustaining because of the heat release and can be catalyzed and promoted by ferriferous phases, alumosilicates (especially zeolites) [133,134], as well by microporous hydrous titano-, niobo-and zirconosilicates, with which bituminous matter is constantly associated in the Khibiny and Lovozero massifs [135].…”

Section: On the Origin Of Hhcgs In Nepheline-syenite Massifsmentioning

confidence: 98%

“…Despite the long history of gas studies, mechanisms, conditions, and relative formation time of HHCGs in the rocks of the Khibiny, Lovozero, and Ilimaussaq, nepheline-syenite/foidolite massifs still remain the most debated [18,27,28,[34][35][36][37][38]40,41,[43][44][45]71,77,[80][81][82][83]99,100]. Herein, the nature of the hydrocarbon component in the occluded gases is discussed.…”

Section: On the Origin Of Hhcgs In Nepheline-syenite Massifsmentioning

confidence: 99%

“…It is may be supposed that the synthesis from initial Н 2 and CO 2 can only be part of the complex multistage process of hydrocarbon generation, including the reactions of oxidation and dehydrogenation, polymerization, and condensation, with a rather wide range of varying thermodynamic parameters [37,93,96,131,133,137], but mainly at the post-magmatic stage [43,100]. In the course of such transformations, which are most intense, apparently, in the circulation zones of meteoric waters, both volatile and nonvolatile (condensation products [133]) carbonaceous substances can be obtained at the same time.…”

Section: On the Origin Of Hhcgs In Nepheline-syenite Massifsmentioning

confidence: 99%

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Occurrence Forms, Composition, Distribution, Origin and Potential Hazard of Natural Hydrogen–Hydrocarbon Gases in Ore Deposits of the Khibiny and Lovozero Massifs: A Review

Nivin

2019

Minerals

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The Khibiny and Lovozero massifs—the world’s largest alkaline massifs—contain deposits with unique reserves of phosphorus and rare metals, respectively. The reduced gas content in the rocks and, especially, the ore deposits of these massifs is unusually high for igneous complexes, thus representing both geochemical and practical interests. There are three morphological types (or occurrence forms) of the gas phase in these deposits: occluded (predominantly in vacuoles of micro-inclusions in minerals), diffusely dispersed, and free. All three morphological types have the same qualitative chemical gas composition. Methane is the main component, and molecular hydrogen (which sometimes dominates) and ethane are the subordinate constituents. Heavier methane homologs (up to and including pentanes), alkenes, helium, and rarely carbon oxide and dioxide are present in minor or trace amounts. All three morphological types of gases are irregularly distributed in space to various degrees. Free gases also show a release intensity that varies in time. The majority of researchers recognize that the origin of these gases is abiogenic and mostly related to the formation of the massifs and deposits. However, the relative time and mechanism of their generation are still debated. Emissions of combustible and explosive hydrogen–hydrocarbon gases pose hazards during the underground mining of ore deposits. Therefore, the distinctive features of gas-bearing capacity are an essential part of the mining and geological characterization of such deposits because they provide a basis for establishing and implementing special measures of the gas regime during mining operations.

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