Manganese carbonates in the upper quaternary sediments of the Deryugin basin (Sea of Okhotsk)

Астахов, А. С.; Tiedemann, Ralf; Murdmaa, I. O.; Bogdanova, O. Yu.; Mozherovsky, A; Sereda, N A

doi:10.1134/s0001437006050122

Cited by 8 publications

(4 citation statements)

References 9 publications

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“…Magnesian calcite shows a wide compositional range (8-30% Mg) and together with dolomite, low Mg calcite and aragonite comprise the minerals common in marine environments. Kutnohorite which occurs widely in hydrothermal mineral deposits was observed in marine carbonate structures associated with methane plumes (Astrakhov et al 2008).…”

Section: Discussionmentioning

confidence: 99%

“…However, it was also reported from freshwater, marine, and oceanic sediments (Mucci 1991). In the Sea of Okhotzk, it occurs in association with methane plumes derived from gas hydrates (Astrakhov et al 2008). The present results indicate that the occurrence of kutnohorite in areas of extensive faults may indicate contribution from a deep methane source.…”

Section: Manganese Distribution-kutnohoritementioning

confidence: 99%

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Mineralogical, chemical and stable C and O isotope characteristics of surficial carbonate structures from the Mediterranean offshore Israel indicate microbial and thermogenic methane origin

et al. 2021

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The Eastern Mediterranean continental slope offshore Israel became a focus of exploration for, and production of, natural gas in recent years. The 2010–2011 Nautilus ROV expedition performed detailed video recordings and sampling in two areas offshore Israel: the Palmachim disturbance, southwest of Tel Aviv, and an area offshore Acre, north of Haifa. An analytical programme regarding the carbonate structures was carried out, examining the overall mineralogy, stable C and O isotopes, and Ca, Mg, and Mn concentrations. This provided information on their composition and as a result, an indication of the carbon sources and temperature of formation. The major authigenic minerals identified comprised magnesian calcite, dolomite, aragonite, and kutnohorite. The detrital minerals included quartz, clays, feldspars, and rare augite and enstatite, likely transported from the Nile estuary. The carbon isotope composition of aliquots taken from nineteen samples from these areas have an overall δ13C range from −62.0 to −0.1‰PDB, indicating a range of microbial/biogenic and thermogenic methane contributions. The range of δ18O from 2.7 to 7.0‰PDB reflects the range of temperatures of formation. The δ18O characteristics differ among areas. In general, high values; δ18O >5‰PDB are recorded from area N2 of the Palmachim disturbance, indicating low temperature of formation. Low values of δ18O (<5‰PDB) were measured from areas W2 and W3 of the Palmachim disturbance, together with samples from area N2 of the Palmachim disturbance, and samples from areas A1 and A2 offshore Acre indicate high temperature origin. Samples from an inactive chimney from area N2 range from pure dolomite to pure magnesian calcite. This trend is linked to δ13C increase from −39.9 to −0.1‰(PDB), and δ18O decrease from 6.2 to 4.7‰(PDB). These values indicate a decrease in the methane-derived carbon contribution and an increase in temperature. Kutnohorite, Ca(Mn2+, Mg, Fe 2+)(CO3)2 is a major component in samples from Acre, and less so in the Palmachim disturbance. An exploratory investigation of the relationship between Mn/Ca, δ18O and δ13C revealed that samples having Mn/Ca < 0.1(wt./wt.) have δ13C<−50‰PDB indicating a microbial methane source, while samples with Mn/Ca > 0.1 have δ13C between −35 and −22‰PDB suggesting a thermogenic origin. These results suggest that the mineralogical, isotopic δ13, δ18O, and chemical (Mn/Ca indicative of kutnohorite) characteristics of surficial carbonate structures can indicate and distinguish between deep and shallow methane sources in the Eastern Mediterranean.

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Section: Discussionmentioning

confidence: 99%

Section: Manganese Distribution-kutnohoritementioning

confidence: 99%

Mineralogical, chemical and stable C and O isotope characteristics of surficial carbonate structures from the Mediterranean offshore Israel indicate microbial and thermogenic methane origin

et al. 2021

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“…The common occurrence of Mn-carbonate inclusions within Mn garnet does not provide evidence for a Mn carbonate precursor. Instead, Mn-carbonates may have formed during diagenetic degradation of organic material and the combination of the evolving CO 2 with Mn from the sediments (e.g., Neumann et al 2002;Astakhov et al 2006). Actually, the relatively (Ronov and Migdisov 1996).…”

Section: Sources Of Manganesementioning

confidence: 98%

Geochemical signature of Ordovician Mn-rich sedimentary rocks on the Avalonian shelf

2011

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wt.% MnO) sedimentary layers (coticules, Strohschiefer) occur in Ordovician siliciclastic sedimentary rocks that were deposited on the Avalonian shelf and subsequently metamorphosed between 340 and 380 Ma. The Mn-rich layers formed during periods of restricted clastic input, when Mn concentrated by a redox-controlled dissolutionprecipitation process near the sediment-water interface, comparable to recent Mn-crusts in the boreal settings of the Baltic Sea, the Barents Sea, and the Kara Sea. Enhanced clastic sedimentation brought the process to a halt and buried the Mnrich layers. Formation of Mn-rich layers resumed upon renewed reduction in clastic input. Nd and Sr isotope data exclude a volcanic or hydrothermal derivation of Mn. Instead, Mn input occurred via rivers from the continental crust. The Nd isotopic composition and geochemical fingerprints of Mn-rich and hosting Mn-poor sedimentary rocks suggests that the clastic input was dominated by material derived from Gondwana rather than from Avalonia. The occurrence of coticules, however, seems to be restricted to the Avalonian shelf.Résumé : Des couches sédimentaires (coticules, Strohschiefer) riches en Mn (3,26-15,6 % poids MnO) se retrouvent dans des roches sédimentaires ordoviciennes qui ont été déposées sur la plate-forme avalonienne et par la suite métamorphisées il y a 340 à 380 Ma. Les couches riches en Mn se sont formées durant des périodes d'entrée limitée de sédiments clastiques, lorsque le Mn se concentrait par un processus de dissolution-précipitation contrôlé par oxydoréduction à proximité de l'interface sédiments-eau, ce qui est comparable aux récentes croûtes Mn dans les environnements boréals de la mer Baltique, la mer de Barents et la mer de Kara. Une sédimentation clastique rehaussée a fait cesser le processus et a enfoui les couches riches en Mn. La formation de couches riches en Mn a repris lorsque l'entrée des sédiments clastiques a de nouveau été ré-duite. Les données provenant des isotopes du Nd et du Sr excluent une provenance volcanique ou hydrothermale pour le Mn. L'entrée de Mn a plutôt été effectuée par les rivières à partir de la croûte continentale. La composition isotopique du Nd et les empreintes géochimiques des roches riches en Mn et les roches pauvres en Mn qui les contiennent suggèrent que l'entrée de clastes ait été dominée par du matériel dérivé du continent de Gondwana plutôt que du continent d'Avalon. La présence de coticules semble toutefois limitée à la plate-forme avalonienne.[Traduit par la Rédaction]

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“…Based on the mineralogy of modern and Holocene Mn-rich submarine deposits (Hein et al, 1997;Astakhov et al, 2006), the precursor of the coticule laminae may have consisted of an aluminous mineral such as kaolinite plus either Mn-rich oxyhydroxide or Mn-rich carbonate, which reacted to form spessartine during low-grade metamorphism (Grapes, 1978;Schreyer et al, 1992;Spry et al, 2000;Nyame, 2001 is adsorbed onto ferric oxyhydroxide, or coprecipitates with it as an amorphous manganese oxyhydroxide phase (Hrischeva and Scott, 2007). Mn-and Fe-rich oxyhydroxide precursors to the Jones Hill exhalites could have formed together in deep seawater under suboxic to oxic conditions, whereas precipitation of a Mn-rich carbonate precursor from seawater would be precluded due to insuffi cient [Mn 2+ aq ] in the bottom waters, unless local Paleoproterozoic deep seawater had an Mn concentration several orders of magnitude higher than that of modern deep oceans (see Glasby and Schulz, 1999).…”

Section: Discussionmentioning

confidence: 99%

Seafloor-hydrothermal Si-Fe-Mn exhalites in the Pecos greenstone belt, New Mexico, and the redox state of ca. 1720 Ma deep seawater

2009

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Mineralogical and geochemical data for ca. 1720 Ma Si-Fe-Mn seafl oor-hydrothermal sedimentary rocks (exhalites) near the Jones Hill Zn-Cu-Pb-Ag-Au volcanogenic massive sulfi de (VMS) deposit, northern NewMexico, provide valuable insights into the redox state of late Paleoproterozoic deep seawater. Distal exhalites ~1200 m south of the deposit form beds 0.5-2 m thick composed of interlayered iron formation and metachert. The iron formation consists mostly of quartz and magnetite, and includes 0.3-3-cm-thick laminae of fi ne-grained garnet-quartz rock, which in places contains as much as 9.4 wt% MnO that resides chiefl y in spessartine-rich garnet (coticule). Shale-normalized rare earth element data for an unaltered, low-Al quartz-magnetite iron formation show no Ce anomaly, which rules out fully oxic deep waters during exhalative mineralization. The garnet-quartz rocks and coticules mostly have small positive Ce anomalies, which are larger for calculated detrital-free compositions, thus precluding deposition in anoxic waters. Signifi cant amounts of ferric iron are inferred for protoliths of the iron formation, based on the presence of abundant magnetite laminae, and of magnetite inclusions in cores of the spessartine garnets. Protoliths of the garnet-quartz rocks and coticules probably consisted largely of clays and Fe-Mn oxyhydroxides. Together these mineralogical and geochemical data suggest that the Jones Hill exhalites were deposited from deep seawater having low concentrations of dissolved O 2 corresponding to suboxic conditions, and not the sulfi dic conditions proposed for late Paleoproterozoic deep seawater by other workers. Exhalites associated with Cu-rich VMS deposits, when effects of alteration and detrital components are considered, can be important proxies for evaluating the evolving redox state of ancient deep oceans. on 23 July 2009 geosphere.gsapubs.org Downloaded from Paleoproterozoic seafl oor-hydrothermal Si-Fe-Mn exhalites Geosphere,

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Manganese carbonates in the upper quaternary sediments of the Deryugin basin (Sea of Okhotsk)

Cited by 8 publications

References 9 publications

Mineralogical, chemical and stable C and O isotope characteristics of surficial carbonate structures from the Mediterranean offshore Israel indicate microbial and thermogenic methane origin

Mineralogical, chemical and stable C and O isotope characteristics of surficial carbonate structures from the Mediterranean offshore Israel indicate microbial and thermogenic methane origin

Geochemical signature of Ordovician Mn-rich sedimentary rocks on the Avalonian shelf

Seafloor-hydrothermal Si-Fe-Mn exhalites in the Pecos greenstone belt, New Mexico, and the redox state of ca. 1720 Ma deep seawater

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