Reduced carbonic fluid and possible nature of high-K magmas of Tolbachik

Simakin, A. G.; Salova, T. P.; Devyatova, V. N.; Zelensky, Michael

doi:10.1016/j.jvolgeores.2015.10.018

Cited by 10 publications

(7 citation statements)

References 36 publications

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“…The K e of nickel carbonyl formation becomes larger than unity at the magmatic temperatures (~1000°C) and pressure of~10 kbar. In accordance with our thermodynamic calculations, Fe(CO) 5 is much less thermally stable than Ni(CO) 4 (Simakin et al 2015).…”

Section: Evidence For Carbonyl Complexingsupporting

confidence: 91%

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DryCO₂–COfluid as an important potential deep Earth solvent

et al. 2016

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Transport properties of reduced carbonic fluid have been studied experimentally at P = 2 kbar and T = 700–1000°C in internally heated pressure vessel (IHPV). Synthetic FeCO3 and natural siderite were used to generate fluid during experiments using a platinum double‐capsule technique. A natural CaTiSiO5 aggregate was placed into the inner capsule as an additional source of trace elements. The outer capsule was loaded with albite glass. No water was introduced to the system and oxygen fugacity was established near to graphite–oxygen (CCO) buffer due to transformation of FeCO3 into a magnetite aggregate during decarbonation to yield CO and CO2. The carbonates decomposed during initial heating of the experiments, causing their some constituent components to be dissolved in and transferred by the fluid to the pore space of the albite glass matrix. After temperature reached 1000°C glass, the shards annealed and then melted, as evidenced by a vesiculated glass in the quench products. Micro‐Raman investigation of the fluid in bubbles in the albite glass in experiments with decomposition of natural siderite yielded CO–CO2 mixture where CO mole fraction was 0.15–0.16. We observe significant concentrations of Pt, Mn, P, and REE in the albite glass; in contrast, no Fe or Mg transfer was detected. LA‐ICP‐MS analysis of the albite glass product yielded the average Pt content of 2 ppm. Such high Pt signal came from Pt particles (100–500 nm in size), which were observed on the walls of the bubbles embedded in the glass. Olivines and aluminous spinel were observed in the Fe‐oxide aggregate, demonstrating transfer of SiO2 and Al2O3 from the albite melt by the reduced carbonic fluid from the albite glass (large capsule). Our results demonstrate that dry CO–CO2 fluid can be important agents of dissolution and transport, especially for Pt and other metals. The data imply that metals are chiefly dissolved as carbonyl complexes.

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Section: Evidence For Carbonyl Complexingsupporting

confidence: 91%

“…In accordance with our thermodynamic calculations, Fe(CO) 5 is much less thermally stable than Ni(CO) 4 (Simakin et al . ).…”

Section: Discussionmentioning

confidence: 97%

DryCO₂–COfluid as an important potential deep Earth solvent

et al. 2016

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“…The pyroxenite source of basaltic magma at a depth of about 100 km or at a lithostatic pressure of about 3 GPa was proposed on the basis of geophysical and general geochemical data [Nikulin et al, 2012]. This assumption was confirmed by our estimate of the pressure in the source of the Tolbachik lava with the formation pressure of chrome-diopside 2.7-3.2 GPa [Simakin et al, 2015].…”

Section: Geologic Settingsupporting

confidence: 81%

“…In any case, at the low pressure anticipated for CVD diamond growth [Kaminsky et al, 2016], the solubility of Ni and Mn in the reduced carbon fluid would be small, and the simultaneous crystallization of carbon and metals corresponding to the observed metal concentrations in diamonds would be hardly possible. The low stability of Fe(CO) 5 shown with thermodynamic calculations [Simakin et al, 2015], is another argument ES5006 simakin: poroelastic response ES5006 in favor of the carbonyls involvement in the formation of Kamchatka diamonds. Synthetic HTHP diamonds, grown from the Fe-Ni alloy, have a higher iron content than natural minerals containing more Ni, Mn, Co with stable carbonyls.…”

Section: High Ni and Mn Content In Diamonds As An Indicator Of The Camentioning

confidence: 96%

Poroelastic response to rapid decarbonatisation as a mechanism of the diamonds formation in the mantle wedge of Kamchatka

Simakin¹

2019

Russ. J. Earth Sci.

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Various geodynamic mechanisms can lead to the penetration of siliceous carbonates into the mantle wedge. Their thermal decomposition in the "mantle olivine autoclave" can be a mechanism for the formation of diamond erupted in subduction zone of Kamchatka. Using the theory of poroelasticity, we showed that rapid heating of a mixture of sideritic dolomite and silica on 150-200 ∘ C in the closed system conditions can temporarily lead to an increase in the fluid pressure by 2-3 GPa. With the initial parameters = 2 GPa and = 830 ∘ C, the carbonic fluid produced during the reaction would get into the PT stability field of the diamond. The growth of diamond at the fluid decomposition in the PT field of metastable graphite can be enhanced by microparticles of native Ni and Mn formed by the thermal decomposition of gaseous metals carbonyls. The corresponding abundant micro-inclusions of Ni and Mn were found in Kamchatka diamonds.

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“…6 уровню (I) под Ичинским вулканом; 2) до уровня горячей мантии, где температура достигает 1400-1500 °C на глубине 50-70 км (наиболее глубинная камера под вулканом Уксичан); 3) до зоны плавления в слэбе на глубине 100-120 км. Эта глубина в вулканических продуктах фиксируется редко и с большим трудом, в частности при специальном поиске включений в раннем оливине [Simakin et al, 2015]. Таким образом, на рисунках 6 и 7 показана принципиальная реконструкция камер под вулканами Ичинский и Толбачик, основаная на данных по расплавным включениям и минералам в сравнение с результатами сейсмотомографий.…”

Section: Introductionunclassified

Первые Итоги И Перспективы Нового Подхода К Исследованию Активных Геологических Процессов С Использованием Космических И Наземных Инструментальных Измерений (На Примере Камчатки И Центрально-Азиатского Горного Пояса)

2020

GiG

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Использование космогеологической информации приводит к новому качеству обобщений по изучению активных геологических процессов разного масштаба. В качестве опорных примеров в работе используются геологические регионы, где накоплена обширная информация с участием авторов. Использование спутниковых данных дистанционного зондирования совместно с гравитационными картами и сейсмической томографией на примере Камчатки позволило получить обоснованные на поверхности и на глубине трехмерные модели от вулканических структур глубиной 10-50 км до мантийных структур глубиной до 650 км. Для молодых вулканогенноосадочных структур Камчатки, возможно, проследить взаимодействие разных процессов от кристаллизации магм в магматических камерах до процессов рудообразования и нефтеобразования в кальдерах. Древние тектонические структуры, а также наложенные кайнозойские деформации на территории Тянь-Шаня, Алтая и Байкальского региона отчетливо отображены на спутниковых снимках и картах гравитационных аномалий. Дальнее воздействие Индо-Евразийской коллизии на Тянь-Шане, Алтае и Байкальском регионе в значительной мере реализовывалось за счет сдвиговых процессов, которые сформировали наиболее контрастные структуры в зонах сочленения региональных разломов и по обрамлению кратонных структур. В активных структурах Горного Алтая широко развиты травертины, проявление которых коррелируется с сейсмической активностью. С глубинными флюидами плюмового происхождения может быть связано массовое образование метана и газогидратов в озере Байкал.

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Reduced carbonic fluid and possible nature of high-K magmas of Tolbachik

Cited by 10 publications

References 36 publications

DryCO₂–COfluid as an important potential deep Earth solvent

DryCO₂–COfluid as an important potential deep Earth solvent

Poroelastic response to rapid decarbonatisation as a mechanism of the diamonds formation in the mantle wedge of Kamchatka

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Reduced carbonic fluid and possible nature of high-K magmas of Tolbachik

Cited by 10 publications

References 36 publications

DryCO2–COfluid as an important potential deep Earth solvent

DryCO2–COfluid as an important potential deep Earth solvent

Poroelastic response to rapid decarbonatisation as a mechanism of the diamonds formation in the mantle wedge of Kamchatka

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DryCO₂–COfluid as an important potential deep Earth solvent

DryCO₂–COfluid as an important potential deep Earth solvent