Boron in an onshore mud volcanic environment: Case study from the Kerch Peninsula, the Caucasus continental collision zone

Sokol, Ella V.; Kokh, Svetlana N.; Kozmenko, O. A.; Lavrushin, V. Yu.; Belogub, E. V.; Хворов, П.В.; Kikvadze, O. E.

doi:10.1016/j.chemgeo.2019.07.018

Cited by 28 publications

(22 citation statements)

References 63 publications

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“…These new data allow us to corroborate that illitization is an important process in the generation of fluids in MVs and can be one of the driving forces of mud volcanism in the area. Boron geochemistry is also relevant in elucidating both mineral processes and fluid origins, as previously proposed by the authors of [25,43,102]. This also is in agreement with other works that show the importance of the relationship of clays and petroleum in oil formation, migration, accumulation and storage [122,123].…”

Section: B Isotopes and Origin Of Fluids In The Gulf Of Cádizsupporting

confidence: 88%

“…Boron geochemistry has been studied recently in different environments as an indicator of fluid circulation and diagenetic grade. A set of samples from different mud volcanoes around the world as indicators of progressive diagenesis show a good correlation between B contents and δ 11 B isotopic values [101,102], although these studies did not carefully separate tetrahedral B from interlayer (trigonal) B. Besides B, the uptake of N in illite (as NH 4…”

Section: Clay Mineralogy and Diagenetic Evolution Of Deep Sediments In The Gulf Of Cádizmentioning

confidence: 99%

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Evidence of Hydrocarbon-Rich Fluid Interaction with Clays: Clay Mineralogy and Boron Isotope Data from Gulf of Cádiz Mud Volcano Sediments

et al. 2020

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Clay dehydration at great depth generates fluids and overpressures in organic-rich sediments that can release isotopically light boron from mature organic matter, producing 10B-rich fluids. The B can be incorporated into the tetrahedral sites of authigenic illite during the illitization of smectite. Therefore, the crystal-chemical and geochemical characterization of illite, smectite or interlayered illite–smectite clay minerals can be an indicator of depth (temperature) and reactions with the basin fluids. The aim of this study was to determine the detailed clay mineralogy, B-content and isotopic composition in illite–smectite rich samples of mud volcanoes from the Gulf of Cádiz, in order to evaluate interactions of hydrocarbon-rich fluids with clays. Molecular modeling of the illite structure was performed, using electron density functional theory (DFT) methods to examine the phenomenon of B incorporation into illite at the atomic level. We found that it is energetically preferable for B to reside in the tetrahedral sites replacing Si atoms than in the interlayer of expandable clays. The B abundances in this study are high and consistent with previous results of B data on interstitial fluids, suggesting that hydrocarbon-related fluids approaching temperatures of methane generation (150 °C) are the likely source of B-rich illite in the studied samples.

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Section: B Isotopes and Origin Of Fluids In The Gulf Of Cádizsupporting

confidence: 88%

Section: Clay Mineralogy and Diagenetic Evolution Of Deep Sediments In The Gulf Of Cádizmentioning

confidence: 99%

Evidence of Hydrocarbon-Rich Fluid Interaction with Clays: Clay Mineralogy and Boron Isotope Data from Gulf of Cádiz Mud Volcano Sediments

et al. 2020

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“…Considering specific chemical composition of tourmaline and its occurrence at sericitequartzo-carbonaceous shale, Serdyuchenko's model of tourmaline forming seems assumable [23]. In this model, first, primary deposition of boron took places in old marine sand and clay sediments; then, during regional or contactregional metamorphism, rock experienced partial recrystallization, and boron migrated and deposited in quartzo-sericitic strings and carbonaceous shale [24,25].…”

Section: Ore Content Of Carbonaceous Shalementioning

confidence: 99%

Geology and gold content of carbonaceous shale in Baikal mineralization site, Southern Ural

Snachev¹,

Snachev²,

Kolomoets³

et al. 2021

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“…The scans were recorded from 6-60 • 2θ at 0.05 • 2θ increments with 5 s scanning time per step. For analytical details, see [54,55].…”

Section: Analytical Proceduresmentioning

confidence: 99%

Ge-Hg-Rich Sphalerite and Pb, Sb, As, Hg, and Ag Sulfide Assemblages in Mud Volcanoes of Sakhalin Island, Russia: An Insight into Possible Origin

et al. 2021

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We characterize the mineralogy and geochemistry of Fe, Zn, Pb, Sb, As, Hg, Ag sulfide assemblages from mud masses currently extruded by the onshore South Sakhalin and Pugachev mud volcanoes (Sakhalin Island, Russia). Abundant Tl-rich pyrite in sulfide concentrate samples from the mud volcanoes coexists with common Hg- and Ge-rich sphalerite, as well as with sporadic boulangerite, robinsonite, bournonite, galena, realgar, metacinnabar, cinnabar, acanthite, and chalcopyrite. Sphalerites are remarkably enriched in Hg (locally reaching 27 wt%) and coupled zwith permanent abnormal enrichment in Ge (3008–3408 ppm). According to single-crystal XRD analyses and Raman spectroscopy, both Hg-poor and Hg-rich sphalerites are single-phase (Zn,Hg)Scub compounds. Pyrite is of diagenetic origin, judging by its trace-element chemistry, particular morphology, and heavy S isotope composition. Another assemblage, composed of Pb-Sb-(Hg) sulfide minerals and lesser As, Cu, Ag, and Bi compounds, results from hydrothermal alteration and is genetically related to Neogene volcano-sedimentary rocks found among the ejecta of the mud volcanoes. The composition of impurities in sphalerite from mud masses indicates crystallization at temperatures lower than ~100 °C, under the leaching effect of mud volcano waters.

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Boron in an onshore mud volcanic environment: Case study from the Kerch Peninsula, the Caucasus continental collision zone

Cited by 28 publications

References 63 publications

Evidence of Hydrocarbon-Rich Fluid Interaction with Clays: Clay Mineralogy and Boron Isotope Data from Gulf of Cádiz Mud Volcano Sediments

Evidence of Hydrocarbon-Rich Fluid Interaction with Clays: Clay Mineralogy and Boron Isotope Data from Gulf of Cádiz Mud Volcano Sediments

Geology and gold content of carbonaceous shale in Baikal mineralization site, Southern Ural

Ge-Hg-Rich Sphalerite and Pb, Sb, As, Hg, and Ag Sulfide Assemblages in Mud Volcanoes of Sakhalin Island, Russia: An Insight into Possible Origin

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