Fluid regime of platinum group elements (PGE) and gold-bearing reef formation in the Dovyren mafic-ultramafic layered complex, eastern Siberia, Russia

Konnikov, E. G.; Meurer, W. P.; Neruchev, S. S.; Prasolov, E. M.; Kislov, E. V.; Orsoev, D. A.

doi:10.1007/s001260050259

Cited by 23 publications

(14 citation statements)

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“…Overall, that gas abundance in chromitites is generally much higher than in other rocks is unequivocal. The CH 4 concentrations (per gram of rock) in our chromitites are higher than those reported for ocean basalts 12 or igneous complexes 21,22 , but similar to those found in other PGE-enriched ultramafic rocks, dunites and lherzolites in Russia 23 . However, it is reasonable to assume that if CH 4 is in the form of free-gas, stored within the interstices and fractures, as suggested by Raman analyses (see below) and as documented, for example, for the Khibiny igneous complex 24 , the samples in surface outcrops, as those investigated in this work, may have experienced considerable degassing (e.g., due to weathering) and most of gas is, then, liberated during the preparation of chips (for milling) and thin sections; therefore the CH 4 observed by us may represent a portion, the residual part, of the actual amount of gas stored in chromitites.…”

Section: Resultssupporting

confidence: 83%

Widespread abiotic methane in chromitites

Etiope

Ifandi

Nazzari

et al. 2018

Sci Rep

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Recurring discoveries of abiotic methane in gas seeps and springs in ophiolites and peridotite massifs worldwide raised the question of where, in which rocks, methane was generated. Answers will impact the theories on life origin related to serpentinization of ultramafic rocks, and the origin of methane on rocky planets. Here we document, through molecular and isotopic analyses of gas liberated by rock crushing, that among the several mafic and ultramafic rocks composing classic ophiolites in Greece, i.e., serpentinite, peridotite, chromitite, gabbro, rodingite and basalt, only chromitites, characterized by high concentrations of chromium and ruthenium, host considerable amounts of 13C-enriched methane, hydrogen and heavier hydrocarbons with inverse isotopic trend, which is typical of abiotic gas origin. Raman analyses are consistent with methane being occluded in widespread microfractures and porous serpentine- or chlorite-filled veins. Chromium and ruthenium may be key metal catalysts for methane production via Sabatier reaction. Chromitites may represent source rocks of abiotic methane on Earth and, potentially, on Mars.

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Section: Resultssupporting

confidence: 83%

Widespread abiotic methane in chromitites

Etiope

Ifandi

Nazzari

et al. 2018

Sci Rep

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“…Neruchev and Prasolov (1995), Nivin and Chashchin (1996), and Konnikov et al (2000) were the first to demonstrate a relationship between the enrichment of these intrusions in fluid components (reduced gases, in particular) and the content of sulfide phase. This problem is not discussed in any foreign publications.…”

Section: Introductionmentioning

confidence: 96%

Composition of fluid inclusions from intrusive rocks of the norite-cortlandite complex, Kamchatka

Konnikov

Vasyukova

2007

Geol. Ore Deposits

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Fluid inclusions in rocks of the Kuvalrog and Shanuch plutons, located in Kamchatka and belonging to the Ni-bearing norite-cortlandite association, have been studied. Microthermometry (heating and freezing) and Raman spectroscopy indicate differing composition of fluid inclusions from these plutons. High-density CO 2 inclusions are characteristic of Kuvalrog, whereas N 2 -CH 4 -CO 2 and aqueous inclusions dominate in Shanuch. The presence of methane in the fluid of the Shanuch pluton is an indicator of its resource potential in respect to high-grade sulfide mineralization.

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“…Как было отмечено выше, существуют две основные группы моделей происхождения горизонтов с малосульфидным типом оруденения: ортомагматическая и флюидно-метасоматическая. В нашем случае первая концепция не находит своего подтверждения, так как отсутствуют, вопервых, геологические, петрографические и геохимические признаки внедрения дополнительной порции магматического расплава, во-вторых, как было показано раннее в нашей работе (Konnikov et al, 2000), она находится в противоречии с характером распределения "фоновых" и "рудных" содержаний Pt и Pd в породах массива (фиг. 14).…”

Section: обсуждение результатовunclassified

“…Наличие такого количества воды можно объяснить поступлением флюидов из дополнительного источника, которым могли служить породы рамы и их ксенолиты в дунитовой зоне. Об участии восстановленных газов в переносе и концентрировании ЭПГ и Au говорилось ранее в нашей работе (Konnikov et al, 2000). Как видно на фиг.…”

Section: обсуждение результатовunclassified

“…Распределение "фоновых" и "рудных" концентраций S, Pt, Pd и суммарного количества восстановленных газов, захваченных в порах и микровключениях пород, в разрезе Йоко-Довыренского массива. Для характеристики восстановленных газов использованы данные (Konnikov et al, 2000). ОРСОЕВ ками расслоенной серии, содержащими сульфидные скопления и ЭПГ-минерализацию.…”

Section: обсуждение результатовunclassified

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Anorthosites of the low-sulfide platiniferous horizon (Reef I) in the upper riphean Yoko-Dovyren massif (Northern Cisbaikalia): new data on the composition, PGE-Cu-Ni mineralization, fluid regime and formation conditions

Orsoev

2019

Геология рудных месторождений

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The carried out studies based on new data allowed to give mineralogical, petro- and geochemical characteristics to anorthosites, which are the main link and the major concentrator of PGE and Au in the composition of low-sulfide platinum metal mineralization, localized in a specific taxitic horizon (Reef I) of the Yoko-Dovyren massif. The revealed features of the composition and structure of this horizon indicate that the formation of anorthosites is caused by both the actual magmatic and the late- and postmagmatic processes with a high activity of volatile components. The horizon occurrence can be explained in terms of the “compaction” hypothesis and thermal shrinkage phenomenon. At the boundary of the rocks contrasting in composition and characteristics, when they are cooled, weakened zones form up to cracks and cavities, into which the interstitial leucocratic melt and volatiles squeezed out of the underlying horizons of the massif sucked as a result of the decompression effect. The revealed patterns of changes in the compositions of Pl (82-88% An), Ol (78-81% Fo), Cpx (40-44% En, 9-18% Fs, 41-47% Wo) and Opx (74-78% En, 16-24% Fs, 2-5% Wo) indicate fractional crystallization of the detrital melt. The processes of fluid-magmatic interaction led to a considerable heterogeneity of anorthosites and other rocks, the formation of disequilibrium mineral associations and concentration of ore-generating components. Sulfide associations are considered as products of the subsolidus transformation of solid solutions (mss and iss + poss) formed during the crystallization of an immiscible sulfide liquid enriched in Cu. It is demonstrated that noble metals were associated not only with a limited amount of sulfide liquid. The major part of noble metals with “crust” components (Sn, Pb, Hg, Bi, As, Sb, Te, S, etc.) entered the anorthosite cavities along with volatile components and chlorine, thus causing an abundance of native minerals among platinoids. The decisive role of reduced gases (H2, CH4, CO), H2O and Cl in the genesis of precious metal minerals is estimated.

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Fluid regime of platinum group elements (PGE) and gold-bearing reef formation in the Dovyren mafic-ultramafic layered complex, eastern Siberia, Russia

Cited by 23 publications

References 0 publications

Widespread abiotic methane in chromitites

Widespread abiotic methane in chromitites

Composition of fluid inclusions from intrusive rocks of the norite-cortlandite complex, Kamchatka

Anorthosites of the low-sulfide platiniferous horizon (Reef I) in the upper riphean Yoko-Dovyren massif (Northern Cisbaikalia): new data on the composition, PGE-Cu-Ni mineralization, fluid regime and formation conditions

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