 | | Journal (article/letter/editorial) | | contents occur in anoxic basins of the central Baltic Sea. We present a new model for the enrichment of...geochemical analyses of Holocene sediments from the Gotland Deep, and on published hydrographic data. Due to...primary production, bottom waters of the central Baltic Sea are anoxic and rich in dissolved Mn’+ Episodically...oxygenated by inflows of denser water from the North Sea. Mixing results in oxidation of Mn*’ to fine-grained...reprecipitated and forms a layer of Ca-rich rhodochrosite on the top of laminated sapropels. Occasionally |  | | Journal (article/letter/editorial) | | behavior of Ca-rhodochrosites in marine muds of the Baltic deeps RASMUSJAKOBSEN’and DIEKE POSTMA’ ‘Geological...organic-rich sediments in the deep anoxic basins of the Baltic Sea. Rhodochrosite formation is apparently the...the result of organic matter degradation. The rhodochrosite contains 10 to 40 mol% CaCO:, and 2 to 5 mol%...varies by about 5 mol% MnCO,. SEM revealed the rhodochrosite to be present as globular aggregates consisting...supersaturated with respect to both rhodochrosite and calcite. Rhodochrosite is only found in sediments where |  | | Journal (article/letter/editorial) | | Molybdenum Manganese Iron Shuttle Paleo-redox Baltic Sea a b s t r a c t A meaningful application of...environments. Stagnant euxinic basins such as the Black Sea are generally regarded as model systems for understanding...However, drawing direct parallels between the Black Sea and open-marine euxinic margins is somewhat complicated...residence time; the weakly restricted Gotland Deep in the Baltic Sea. Here, prolonged periods of euxinia...Mn and Fe that has accumulated within the euxinic deep water can be oxidized and precipitated. Co-variations |  | | Journal (article/letter/editorial) | | deposition and Mn-sulfide formation in the Gotland Deep, Baltic Sea IAN T. BURKE and ALAN E. S. KEMP* School...sediments of the Gotland Deep have been commonly related to the periodic renewal of deep water by inflowing...inflowing saline water from the North Sea. The use of scanning electron microscopy– based techniques allows...agreement with the seasonal distribution of major Baltic inflow events recorded in historical records, and...kutnahorite laminae studied, is reported in Gotland Deep sediments for the first time. Although Mn-sulfide |  | | Journal (article/letter/editorial) | | mineral formation in Holocene sediments of the Baltic Sea John Sternbeck a, Gustav Sohlenius b a Department...the Gotland Deep, Baltic Sea, during freshwater and brackish stages. Calcium-rich rhodochrosite (MnCO...in a high-alkalinity environment facilitated rhodochrosite precipitation at the sediment surface. Pyrite...Keywords: Sulfur isotopes; Iron sulfide; Manganese; Rhodochrosite; Diagenesis; Anoxic sediments 1. Introduction...authigenic sulfides and carbonates (e.g., in the Baltic deeps: 0009-2541/97/$17.00 Copyright 0 1997 Elsevier |  | Lenz, Conny, Behrends, Thilo, Jilbert, Tom, Silveira, Miguel, Slomp, Caroline P. (2014) Redox-dependent changes in manganese speciation in Baltic Sea sediments from the Holocene Thermal Maximum: An EXAFS, XANES and LA-ICP-MS study. Chemical Geology, 370. 49-57 doi:10.1016/j.chemgeo.2014.01.013 | Journal (article/letter/editorial) | | Redox-dependent changes in manganese speciation in Baltic Sea sediments from the Holocene Thermal Maximum:...Anoxic basin Baltic Sea a b s t r a c t Manganese (Mn) enrichments in sediments of the deep basins of the...the Baltic Sea are believed to consist of Ca–Mn– carbonates that form from Mn oxides following periodic...periodic inflows of oxygen-rich North Sea waters. However, a range of Mn-bearing mineral phases, that besides...besides Mn-carbonates (e.g. Ca-rhodochrosite), can include Mnsulfides are known to be present in marine sediments |  | | Journal (article/letter/editorial) | | composition of authigenic Ca-rhodochrosites of the Baltic Sea THOMAS NEUMANN,1,* UWE HEISER,1 MARKUS A. LEOSSON...authigenic Ca-rich rhodochrosite (ACR) in sapropelic sediments of the Gotland Basin, Baltic Sea, is governed...the North Atlantic flushes the brackish anoxic Baltic Deeps. The carbon and oxygen isotopic compositions...important role of microbial MnO2 reduction during rhodochrosite authigenesis and suggest that Mn(II) activity...porewater Mn concentrations sufficient for rhodochrosite precipitation may be obtained by burial of Mn-oxides |  | | Journal (article/letter/editorial) | | Smthern Irelnntl A geochemical profile in the Baltic Sea* FKANK T. MANHEIM Geochemical Laboratory, Geological...distribution in sediments from t,he Baltic Sea. A prominent~ feature of the Baltic is its s&nity stratification...redox potential determinations. In two of t,he Baltic deeps manganese was found enriched in sapropelic...elements in sediments from the Skagerack to the Baltic Sea (see location map, Fig. 1). To obtain more quantitative...interesting features shown by sediments in the central Baltic area. Only a brief mention of the sampling and |  | Scholz, Florian, Baum, Matthias, Siebert, Christopher, Eroglu, Sümeyya, Dale, Andrew W., Naumann, Michael, Sommer, Stefan (2018) Sedimentary molybdenum cycling in the aftermath of seawater inflow to the intermittently euxinic Gotland Deep, Central Baltic Sea. Chemical Geology, 491. 27-38 doi:10.1016/j.chemgeo.2018.04.031 | Journal (article/letter/editorial) | | inflow to the intermittently euxinic Gotland Deep, Central Baltic Sea Florian Scholz, Matthias Baum, Christopher...inflow to the intermittently euxinic Gotland Deep, Central Baltic Sea. The address for the corresponding...inflow to the intermittently euxinic Gotland Deep, Central Baltic Sea Florian Scholz1*, Matthias Baum1,...fscholz@geomar.de SC Abstract RI Leibniz Institute for Baltic Sea Research Warnemünde, Seestraße 15, 18119 Rostock...the intermittently euxinic Gotland Deep in the central Baltic PT E Sea. Here, multiannual to decadal |  | | Journal (article/letter/editorial) | | phosphorus minerals in the euxinic basins of the Baltic Sea Tom Jilbert ⇑, Caroline P. Slomp Department of...(Ca)-carbonate-phosphates in the deep euxinic basins of the Baltic Sea. These minerals constitute major... Particle shuttles of Fe and Mn oxides into the deep euxinic basins act as drivers for P-bearing mineral...following inflow events of oxygenated North Sea water into the deep basins. The mechanism of Fe(II) phosphate...spatial distribution of both authigenic phases in Baltic sediments varies in accordance with the periodic |  | Hermans, Martijn, Lenstra, Wytze K., van Helmond, Niels A.G.M., Behrends, Thilo, Egger, Matthias, Séguret, Marie J.M., Gustafsson, Erik, Gustafsson, Bo G., Slomp, Caroline P. (2019) Impact of natural re-oxygenation on the sediment dynamics of manganese, iron and phosphorus in a euxinic Baltic Sea basin. Geochimica et Cosmochimica Acta, 246. 174-196 doi:10.1016/j.gca.2018.11.033 | Journal (article/letter/editorial) | | of manganese, iron and phosphorus in a euxinic Baltic Sea basin Martijn Hermans a,⇑, Wytze K. Lenstra a...3508 TA Utrecht, the Netherlands b Baltic Nest Institute, Baltic Sea Centre, Stockholm University, SE-106...Available online 26 November 2018 Abstract The Baltic Sea is characterized by the largest area of hypoxic...largely depends on episodic Major Baltic Inflows from the adjacent North Sea. In 2014 and 2015, two such inflows...4 ) in waters below 125 m depth in the Eastern Gotland Basin. This provided the opportunity to assess |  | Ni, S., Quintana Krupinski, N.B., Groeneveld, J., Persson, P., Somogyi, A., Brinkmann, I., Knudsen, K.L., Seidenkrantz, M.-S., Filipsson, H.L. (2020) Early diagenesis of foraminiferal calcite under anoxic conditions: A case study from the Landsort Deep, Baltic Sea (IODP Site M0063). Chemical Geology, 558. 119871pp. doi:10.1016/j.chemgeo.2020.119871 | Journal (article/letter/editorial) | | conditions: A case study from the Landsort Deep, Baltic Sea (IODP Site M0063) S. Nia,b, , N.B. Quintana...extreme anoxic conditions in the Baltic Sea's deepest basin (the Landsort Deep, IODP Exp. 347, Site M0063)...under oxygen-depleted conditions in the Landsort Deep, resulting in formation of carbonates with highly...and Fe-rich authigenic mineral formation. The Baltic Sea is the world's second largest stratified brackish...brackish water body, and is connected to the North Sea through the Skagerrak, Kattegat and the Danish Straits |  | | Report (chapter) | | formation of ferromanganese concretions in the Baltic Sea: a critical review G . P. G L A S B Y 1, E. M...Abstract: Ferromanganese concretions from the Baltic sea can be divided into three main types based on... Finland and Riga, from the Baltic Proper and from the western Belt Sea. Concretions from the Gulf of...sedimentation rates are <0.4 mm a -1 . In the Bothnian Sea, fiat crusts with low Mn/Fe ratios are widely distributed...Concretions from the Baltic Proper are found mainly around the margins of the deep basins in a depth range |  | Noordmann, J., Weyer, S., Montoya-Pino, C., Dellwig, O., Neubert, N., Eckert, S., Paetzel, M., Böttcher, M.E. (2015) Uranium and molybdenum isotope systematics in modern euxinic basins: Case studies from the central Baltic Sea and the Kyllaren fjord (Norway) Chemical Geology, 396. 182-195 doi:10.1016/j.chemgeo.2014.12.012 | Journal (article/letter/editorial) | | euxinic basins: Case studies from the central Baltic Sea and the Kyllaren fjord (Norway) J. Noordmann...euxinic basins: Case studies from the central Baltic Sea and the Kyllaren fjord (Norway), Chemical Geology...euxinic basins: Case studies from the central Baltic Sea and the Kyllaren fjord (Norway) T J. Noordmann*†a...Geowissenschaften, 60438 Frankfurt, c Leibniz Institute for Baltic Sea Research (IOW), 18119 Warnemünde, Germany Institute...in selected modern anoxic basins (Baltic Sea: Landsort and Gotland Deeps and the Kyllaren fjord in Norway) |  | Yu, Changxun, Virtasalo, Joonas J., Österholm, Peter, Burton, Edward D., Peltola, Pasi, Ojala, Antti E.K., Hogmalm, Johan K., Åström, Mats E. (2016) Manganese accumulation and solid-phase speciation in a 3.5 m thick mud sequence from the estuary of an acidic and Mn-rich creek, northern Baltic Sea. Chemical Geology, 437. 56-66 doi:10.1016/j.chemgeo.2016.05.016 | Journal (article/letter/editorial) | | estuary of an acidic and Mn-rich creek, northern Baltic Sea Changxun Yu a,⁎, Joonas J. Virtasalo b, Peter...Mn speciation X-ray absorption spectroscopy Rhodochrosite Acid sulfate soil a b s t r a c t In sediments...extraction show that Mn occurs mainly as authigenic rhodochrosite at these two depth intervals and is mainly surface-sorbed...hydroxides, the precursors of the authigenic rhodochrosite (and also of the surface-sorbed Mn), rather...experiment failed to fractionate a majority of rhodochrosite into SCE step-2 (1 M NH4acetate at pH 6), which |  | Cabral, Alexandre Raphael, Zeh, Armin, Viana, Nívea Cristina da Silva, de Castro, Marco Paulo, Laufek, František, Lehmann, Bernd, Queiroga, Gláucia (2019) Alabandite (MnS) in metamorphosed manganiferous rocks at Morro da Mina, Brazil: palaeoenvironmental significance. European Journal of Mineralogy, 31 (5) 973-982 doi:10.1127/ejm/2019/0031-2879 | Journal (article/letter/editorial) | | molybdenite; (3) alabandite + rhodochrosite + molybdenite; (4) and alabandite + rhodochrosite. The different assemblages...metamorphic temperature constrained by the assemblage rhodochrosite– tephroite–pyroxmangite, which indicates at...± 1.4 mol% FeS. Spessartine, tephroite and rhodochrosite are the main manganese minerals that are spatially...by 7–9 wt% FeO and 4–6 wt% MgO. The mineral rhodochrosite contains considerable amounts of calcium, as...with interstitial rhodochrosite, i.e., bismuth telluride–spessartine–rhodochrosite (Fig. 2B). The optical |  | Herndon, Elizabeth M., Havig, Jeff R., Singer, David M., McCormick, Michael L., Kump, Lee R. (2018) Manganese and iron geochemistry in sediments underlying the redox-stratified Fayetteville Green Lake. Geochimica et Cosmochimica Acta, 231. 50-63 doi:10.1016/j.gca.2018.04.013 | Journal (article/letter/editorial) | | surface waters overlying 25 anoxic to euxinic deep waters throughout the Proterozoic and even during...the center of Fayetteville Green Lake in the 73 deep basin (Figure 1). Optical dissolved oxygen (D.O...saturation indices for calcite (CaCO3), 108 rhodochrosite (MnCO3), and kutnohorite (CaMn(CO3)2) were calculated...Jensen et al. (2002) for calcite and 113 rhodochrosite and from Mucci (2004) for kutnohorite. 114...150 include the Mn(II)-bearing carbonates rhodochrosite (MnCO3), kutnohorite (CaMn(CO3)2), and 151 |  | | Journal (article/letter/editorial) | | Pergamon PI1 SOO16-7037(96)00379-l Kinetics of rhodochrosite crystal growth at 25°C: The role of surface...form November 3, 1996) Abstract-The rate of rhodochrosite (MnC03) crystal growth in NaCl solutions has...been proposed that the surface speciation of rhodochrosite is dependent on PC02, Mn2+, and pH (Van Cappellen...However, at R = 5 and 50 crystal growth of rhodochrosite is about 4000 and 500 times slower, respectively...control for rhodochrosite and calcite formation. The formation of calcite-rhodochrosite solid solutions |  | Liang, Wen, Li, Lin, Li, Rui, Yin, Yuan, Li, Zeming, Liu, Xiqiang, Shan, Shuangmin, He, Yu, Meng, Yong, Li, Zengsheng, Li, Heping (2020) Crystal structure of impurity-free rhodochrosite (MnCO3) and thermal expansion properties. Physics and Chemistry of Minerals, 47 (2) doi:10.1007/s00269-019-01078-2 | Journal (article/letter/editorial) | | ORIGINAL PAPER Crystal structure of impurity‑free rhodochrosite (MnCO3) and thermal expansion properties Wen...in thermal expansion properties reported in rhodochrosite (MnCO3) previously Rao and Murthy (J Mater...this spirit, single crystals of impurity-free rhodochrosite, up to 100 μm in size, were synthesized under...natural carbonates. Keywords Impurity-free rhodochrosite single crystal · Crystal structure · Single-crystal...Fe)CO3) is of great importance in understanding the deep-carbon storage characteristics of the Earth’s interior |  | | Journal (article/letter/editorial) | | of adsorbed Mn(II) and precipitated MnCO3 (rhodochrosite). Both cultures showed the same general trends...because the dissolution velocity of synthetic rhodochrosite in aqueous solution is slow (Böttcher, unpublished...enriched in manganese as the anoxic basins of the Baltic Sea (Huckriede and Meischner, 1996). Huckriede and...conditions force water from the North Sea to enter the Baltic Sea. This oxygenated dense water mixes with...partitioning during experimental precipitation of rhodochrosite-calcite solid-solutions from aqueous solutions |  | | Journal (article/letter/editorial) | | severe hydrographic restriction, such as the Black Sea, where renewal times of the water mass are of the...Mo/TOC is around 4.5 for sediments from the Black Sea, the archetypal restricted basin, and is around 6...immobilization; typically, Co in pyrite and Mn in rhodochrosite. (Berrang and Grill 1974; T Davison et al...al. (2008) to have been mostly euxinic but with a deep redoxcline that varied in level with time and sometimes...with samples from the Baltic Sea, where euxinic basins (Arkona, Bornholm, Gotland, deeps) have a low salinity |  | Polgári, M., Bajnóczi, B., Kovács Kis, V., Götze, J., Dobosi, G., Tóth, M., Vigh, T. (2007) Mineralogical and cathodoluminescence characteristics of Ca-rich kutnohorite from the Úrkút Mn-carbonate mineralization, Hungary. Mineralogical Magazine, 71 (5) 493-508 doi:10.1180/minmag.2007.071.5.493 | Journal (article/letter/editorial) | | fossiliferous concretions composed mainly of rhodochrosite from the Mn-carbonate mineralization at Úrkút...Úrkút. K EY WORDS : kutnohorite, kutnahorite{, rhodochrosite, cathodoluminescence, spectroscopy, PIXE, TEM...smithsonite (Götte and Richter, 2004) and rhodochrosite (Gaft et al., 2005). It is generally accepted...Mn) carbonates (manganocalcite, kutnohorite, rhodochrosite) does not exist. The possible limit of concentration...not known. Walker et al. (1989) found that rhodochrosite with 46.0 wt.% Mn and 1.0 wt.% Fe was virtually |  | Hein, James R, Fan, Delian, Ye, Jie, Liu, Tiebing, Yeh, Hsueh-Wen (1999) Composition and origin of Early Cambrian Tiantaishan phosphorite–Mn carbonate ores, Shaanxi Province, China. Ore Geology Reviews, 15 (1) 95-134 doi:10.1016/s0169-1368(99)00017-7 | Journal (article/letter/editorial) | | hydroxy- and carbonate fluorapatite and Ca rhodochrosite, with Mg kutnahorite and dolomite comprising...continental shelves, overturn of stagnant, metal-rich deep-ocean waters, and marine transgression. Water depth...changes in water depth, productivity, upwelling, sea-level change, and ventilation of the depositional...(1999) 95–134 overturn of stagnant, metal-rich deep-ocean waters, which were redistributed to areas...carbonates other than dolomite and includes rhodochrosite and kutnahorite in the upper section and calcite |  | | Journal (article/letter/editorial) | | of the mechanisms of rapid climate change. In deep-sea settings, the discovery of the episodic occurrence...deployment of the Hydraulic Piston Corer in 1978 by the Deep Sea Drilling Project (DSDP) in its Leg 67 in the Gulf...waters of the basin and the open sea. Such basins range in scale from sea lochs and fjords such as Saanich...Santa Barbara) to marginal seas such as the Black Sea. In these circumstances, available oxygen is not...nature and magnitude of the flux of sediment to the sea floor or lake bed. Because of the diverse environmental |  | | Report (chapter) | | University of Otago on October 15, 2015 Chapter 7 The Baltic Sea continental shelf SZYMON UŚCINOWICZ Branch of...uscinowicz@pgi.gov.pl) Abstract: The Baltic Sea is a semi-enclosed intracontinental sea of approximately 418 500...four times larger than the area of the sea itself. The Baltic Sea has an average depth of around 50 m,...Danish Straits. A characteristic feature of the Baltic Sea is thermohaline stratification, in particular...The northern part of the Baltic Sea is situated within the Precambrian Baltic Shield, whereas the southern |
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