Mineralogical and geochemical indicators of anoxic sedimentation conditions in local depressions within the Sea of Okhotsk in the late Pleistocene-Holocene

Derkachev, A. N.; Nikolaeva, N. A.; Mozherovsky, A; Grigor'eva, T. N.; Ivanova, Elena; Плетнев, С. П.; Barinov, N. N.; Чубаров, В. М.

doi:10.1134/s1819714007030013

Cited by 11 publications

(7 citation statements)

References 29 publications

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“…Besides sedimentary P concentrations and C org / P ratios, the occurrence of vivianite ((Fe 3 PO 4 ) 2 · 8H 2 O) in sediments is also used in reconstructions of paleo-environmental conditions in lake and marine basins (e.g., Derkachev et al, 2007;Kalniņa et al, 2000;Taldenkova et al, 2010). These Fe(II) phosphates can precipitate in surface sediments with sulfide-depleted porewaters that are rich in both Fe 2+ and PO 4 (Berner, 1981;Nriagu and Dell, 1974;Nriagu, 1972).…”

Section: Introductionmentioning

confidence: 99%

Post-depositional formation of vivianite-type minerals alters sediment phosphorus records

et al. 2018

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Abstract. Phosphorus (P) concentrations in sediments are frequently used to reconstruct past environmental conditions in freshwater and marine systems, with high values thought to be indicative of a high biological productivity. Recent studies suggest that the post-depositional formation of vivianite, an iron(II)-phosphate mineral, might significantly alter trends in P with sediment depth. To assess its importance, we investigate a sediment record from the Bornholm Basin that was retrieved during the Integrated Ocean Drilling Program (IODP) Baltic Sea Paleoenvironment Expedition 347 in 2013, consisting of lake sediments overlain by brackish-marine deposits. Combining bulk sediment geochemistry with microanalysis using scanning electron microscope energy dispersive spectroscopy (SEM-EDS) and synchrotron-based X-ray absorption spectroscopy (XAS), we demonstrate that vivianite-type minerals rich in manganese and magnesium are present in the lake deposits just below the transition to the brackish-marine sediments (at 11.5 to 12 m sediment depth). In this depth interval, phosphate that diffuses down from the organic-rich, brackish-marine sediments meets porewaters rich in dissolved iron in the lake sediments, resulting in the precipitation of iron(II) phosphate. Results from a reactive transport model suggest that the peak in iron(II) phosphate originally occurred at the lake-marine transition (9 to 10 m) and moved downwards due to changes in the depth of a sulfidization front. However, its current position relative to the lake-marine transition is stable as the vivianite-type minerals and active sulfidization fronts have been spatially separated over time. Experiments in which vivianite was subjected to sulfidic conditions demonstrate that incorporation of manganese or magnesium in vivianite does not affect its susceptibility to sulfide-induced dissolution. Our work highlights that post-depositional formation of iron(II) phosphates such as vivianite has the potential to strongly alter sedimentary P records particularly in systems that are subject to environmental perturbation, such as a change in primary productivity, which can be associated with a lake-marine transition.

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Section: Introductionmentioning

confidence: 99%

Post-depositional formation of vivianite-type minerals alters sediment phosphorus records

et al. 2018

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“…Our data on the morphology, internal structure, mineralogy, and isotopic composition of Lower Ordovician anthraconites of the Baltic paleobasin reveal many similarities to glendonites. Glendonites are usually found in terrigenous sediments, ranging from mudstones to sandstones ( [31][32][33][34], amongst others), while modern ikaite crystals are known from muddy deposits [35] and organic-rich sediments [36,37].…”

Section: Discussionmentioning

confidence: 99%

Glendonite-Like Carbonate Aggregates from the Lower Ordovician Koporye Formation (Russian Part of the Baltic Klint): Detailed Mineralogical and Geochemical Data and Paleogeographic Implications

et al. 2019

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Stellate and plate-like carbonate bodies, traditionally called anthraconites, are found throughout the Baltic-Ladoga Klint in bituminous shale of the Koporye Formation (Tremadocian, Lower Ordovician). Although this time interval is usually considered as a greenhouse, there is some evidence for the existence of at least temporary cold conditions during the Cambrian–Ordovician. However, the origin of anthraconites is still strongly debated. We studied the mineralogical, petrographic, cathodoluminescence, geochemical, and isotopic characteristics of anthraconites from five sections of the Russian part of the Baltic paleobasin. A close similarity between the morphological, petrographic, cathodoluminescence, and isotopic characteristics of the studied anthraconites with those of glendonites allow us to suggest that these bodies formed in a similar paleo-environment and should be considered as pseudomorphs of the mineral ikaite. The oxygen and carbon isotope ratios reveal that ikaite precipitation occurred in low-temperature conditions on the seafloor. The carbon isotopic values reveal influence of inorganic seawater carbon along with organic matter decomposition and/or methane oxidation during ikaite-glendonite transformations. The oxygen isotopic composition significantly changed after deposition due to meteoric diagenesis. We propose that the studied Tremadocian anthraconites formed under a region of upwelling, where cold phosphate-rich deep waters rose to the relatively shallow part of the Baltic paleobasin, providing favorable conditions for ikaite precipitation. Based on our cathodoluminescence study, we suggest that ikaite was transformed to calcite over several stages during diagenesis. Mineralogical studies also reveal that primary calcite was transformed to sulfate (gypsum) or dolomite during late superimposed processes.

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“…Hydrogen bonding links CaCO 3 q 6H 2 O moieties to form the crystal structure (Lennie et al, 2004). Ikaite has been found in natural modern-day environments at temperatures ranging from −2 to +7 • C (Dieckmann et al, 2008;Huggett et al, 2005;Suess et al, 1982). The relative abundance of ikaite in nature is attributed to its metastability (e.g., Marland, 1975).…”

Section: Mineralogy and Petrologymentioning

confidence: 99%

“…Unlike calcite and aragonite, ikaite is typically characterized by pyramidal, spear-like (e.g., Dieckmann et al, 2008;Tang et al, 2009;Rysgaard et al, 2014), or stellate crystals (e.g., Selleck et al, 2007) with square-prismatic cross sections (e.g., Swainson and Hammond, 2001) (Fig. 1).…”

Section: Morphologymentioning

confidence: 99%

“…Modern ikaite occurs in a wide range of cold-water environments. Ikaite microcrystals have been recorded in sea ice and cold caves, ikaite tufa has been reported from shallow marine and lacustrine settings, and macrocrystals and their aggregates have been described from hypersaline springs and lacustrine and marine sediments, ranging from littoral environments to abyssal depths (up to ∼ 6950 m) (Pauly, 1963;Stein and Smith, 1986;Ito, 1996;Dieckmann et al, 2008;Last and Last, 2012;Geptner et al, 2014;Fink et al, 2014;Oehlerich et al, 2015). Occurrences of ikaite pseudomorphs (glendonites) in the geological record are characterized by a slightly less diverse range of paleoenvironments.…”

Section: Introductionmentioning

confidence: 99%

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Database of global glendonite and ikaite records throughout the Phanerozoic

Rogov

Ershova

Vereshchagin

et al. 2021

Earth Syst. Sci. Data

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Abstract. This database of Phanerozoic occurrences and isotopic characteristics of metastable cold-water calcium carbonate hexahydrate (ikaite; CaCO3⚫6H2O) and their associated carbonate pseudomorphs (glendonites) has been compiled from academic publications, explanatory notes, and reports. Our database including more than 700 occurrences reveals that glendonites characterize cold-water environments, although their distribution is highly irregular in space and time. A significant body of evidence suggests that glendonite occurrences are restricted mainly to cold-water settings; however they do not occur during every glaciation or cooling event of the Phanerozoic. While Quaternary glendonites and ikaites have been described from all major ocean basins, older occurrences have a patchy distribution, which may suggest poor preservation potential of both carbonate concretions and older sediments. The data file described in this paper is available on Zenodo at https://doi.org/10.5281/zenodo.4386335 (Rogov et al., 2020).

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Mineralogical and geochemical indicators of anoxic sedimentation conditions in local depressions within the Sea of Okhotsk in the late Pleistocene-Holocene

Cited by 11 publications

References 29 publications

Post-depositional formation of vivianite-type minerals alters sediment phosphorus records

Post-depositional formation of vivianite-type minerals alters sediment phosphorus records

Glendonite-Like Carbonate Aggregates from the Lower Ordovician Koporye Formation (Russian Part of the Baltic Klint): Detailed Mineralogical and Geochemical Data and Paleogeographic Implications

Database of global glendonite and ikaite records throughout the Phanerozoic

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