Age and growth rates of ferromanganese concretions from the gulf of Finland derived from 210Pb measurements

Grigoriev, A. G.; Zhamoida, Vladimir; Gruzdov, K. A.; Krymsky, R. Sh.

doi:10.1134/s0001437013030041

Cited by 10 publications

(6 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Spheroidal concretions seem to contain more columnar structures, which suggests that they generally form in more tranquil settings with comparatively rapid growth compared to crust concretions. 226 Ra/Ba and 210 Pb radiometric dating of Baltic Sea Fe-Mn concretions support more rapid spheroidal than crust concretion growth (Grigoriev et al, 2013;Liebetrau et al, 2002). Given that MTB may be the source of nanoscale SD magnetite in Baltic Sea Fe-Mn concretions, as discussed above, it appears that both spheroidal morphotype formation conditions and increased water depth favor MTB activity and the production and/or preservation of biogenic magnetite (Tables 1 and 2, Figure 3).…”

Section: Implications For the Hydrodynamic And Depositional Environmentmentioning

confidence: 84%

“…In the Baltic Sea, concretions are porous and have various sizes and shapes (i.e., crust, discoidal, and spheroidal) and harbor diverse microbial communities with reductive and oxidative metabolisms that can influence both concretion growth and dissolution (Yli‐Hemminki et al., 2014; Zhang et al., 2002). These brackish water concretions grow exceptionally rapidly, averaging tens of μm per year (Grigoriev et al., 2013; Liebetrau et al., 2002) compared to typical growth rates of a few mm per Myr on the deep ocean floor (e.g., Frank et al., 1999; Klemm et al., 2005; Marcus et al., 2015). This suggests microbial catalysis in their growth that enables them to record recent environmental processes at high‐resolution over thousands of years timescales.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Morphology‐Dependent Magnetic Properties in Shallow‐Water Ferromanganese Concretions

Wasiljeff,

Salminen,

Roberts

et al. 2024

Geochem Geophys Geosyst

View full text Add to dashboard Cite

Ferromanganese concretions commonly occur in shallow‐water coastal regions worldwide. In the Baltic Sea, they can record information about past and present underwater environments and could be a potential source for critical raw materials. We report on their microstructural characteristics and magnetic properties and link them to their formation mechanisms and environmental significance. Microstructural investigations from nano‐ and micro‐computed tomography, electron microscopy, and micro‐X‐ray fluorescence elemental mapping reveal diverse growth patterns within concretions of different morphologies. Alternating Fe‐ and Mn‐rich growth bands indicate fluctuating redox conditions during formation. Bullet‐shaped magnetofossils, produced by magnetotactic bacteria, are present, which suggests the influence of bacterial activity on concretion formation. Spheroidal concretions, which occur in deeper and more tranquil environments, have enhanced microbial biomineralization and magnetofossil preservation. Conversely, crusts and discoidal concretions from shallower and more energetic environments contain fewer magnetofossils and have a greater detrital content. Our results provide insights into concretion formation mechanisms and highlight the importance of diagenetic processes, oxygen availability, and bacterial activity in the Baltic Sea.

show abstract

Section: Implications For the Hydrodynamic And Depositional Environmentmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Morphology‐Dependent Magnetic Properties in Shallow‐Water Ferromanganese Concretions

Wasiljeff,

Salminen,

Roberts

et al. 2024

Geochem Geophys Geosyst

View full text Add to dashboard Cite

show abstract

“…In recent years, the Fe-Mn polymetallic crusts and nodules in marginal seas have received increasing attention, esp. those in the Baltic Sea (Grigoriev et al, 2013;Yli-Hemminki et al, 2016) and the California continental margin (Hein, 2005;Conrad et al, 2017). Several mineralogical and geochemical studies on the Fe-Mn crusts and nodules in the South China Sea (SCS) have also been carried out (Li and Zhang, 1990;Bao and Li, 1993;Lin et al, 2003;Zhang and Weng, 2005;Zhang et al, 2009;Wang and Zhang, 2011;Zhang et al, 2013;Zhong et al, 2017;Guan et al, 2017a;Guan et al, 2017b;Guan et al, 2017c;Guan et al, 2019;Jiang et al, 2019;Zhou et al, 2021;Konstantinova et al, 2022).…”

Section: Introductionmentioning

confidence: 98%

Nano-mineralogy and growth environment of Fe-Mn polymetallic crusts and nodules from the South China Sea

Ren

Guan²,

Sun³

et al. 2023

Front. Mar. Sci.

View full text Add to dashboard Cite

Fe-Mn polymetallic crusts and nodules from the South China Sea (SCS) consist of submarine ferromanganese (Fe-Mn) oxide precipitates, and represent important marine mineral resource with substantial economic and scientific research value. Previous studies on the SCS polymetallic crusts and nodules were mainly focused on their bulk mineralogy and geochemistry, whilst research on their nanomineralogy is still lacking. In this study, transmission electron microscopy (TEM), Raman spectroscopic mapping, and in-situ micro X-ray diffraction (XRD) analysis were conducted on the nano-mineralogy of the SCS polymetallic crusts and nodules. It is found that the SCS polymetallic crusts and nodules consist mainly of layered/columnar/mottled nano-phase Fe-Mn minerals and detritus such as quartz, feldspar, and clays. Also, an independent Ti mineral phase has been documented, and the mineralogical analysis reveals the transformation from vernadite to birnessite and todorokite. Titanium forms colloidal minerals in seawater and precipitates into the crusts and nodules with other colloids, such as FeOOH and Si-Al. Vernadite and birnessite can be transformed to todorokite with stable structure under sub-oxic conditions. Therefore, the SCS polymetallic crusts and nodules were formed in a short period of sub-oxic environment and diagenetic process, and the transformation can influence the enrichment of Ni and other metals during the crust/nodule growth.

show abstract

“…Concretion formation is further driven by microbial reduction, and the diverse bacterial communities associated with concretions affect both their growth and dissolution (Zhang et al, 2002;Yli-Hemminki et al, 2014). As a result of their complex formation mechanisms, the distribution and abundance of mineral concretions on the seafloor is heterogeneous, and they are found in variable shapes and sizes, ranging from < 2 mm buckshot concretions to crusts of >1 m. They are present in a variety of geological settings, and their growth rates vary, depending on environmental conditions, from 0.003 to 0.3 mm a −1 (Zhamoida et al, 2007;Grigoriev et al, 2013). Under oxygen rich conditions, iron and manganese tend to form oxides, contributing to the growth of concretions, while in anoxic conditions concretions are partly dissolved (Zhamoida et al, 2007;Yli-Hemminki et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Extensive Coverage of Marine Mineral Concretions Revealed in Shallow Shelf Sea Areas

et al. 2019

View full text Add to dashboard Cite

Ferromanganese (FeMn) concretions are mineral precipitates found on soft sediment seafloors both in the deep sea and coastal sea areas. These mineral deposits potentially form a three-dimensional habitat for marine organisms, and contain minerals targeted by an emerging seabed mining industry. While FeMn concretions are known to occur abundantly in coastal sea areas, specific information on their spatial distribution and significance for marine ecosystems is lacking. Here, we examine the distribution of FeMn concretions in Finnish marine areas. Drawing on an extensive dataset of 140,000 sites visited by the Finnish Inventory Programme for the Underwater Marine Environment (VELMU), we examine the occurrence of FeMn concretions from seabed mapping, and use spatial modeling techniques to estimate the potential coverage of FeMn concretions. Using seafloor characteristics and hydrographical conditions as predictor variables, we demonstrate that the extent of seafloors covered by concretions in the northern Baltic Sea is larger than anticipated, as concretions were found at ∼7000 sites, and were projected to occur on over 11% of the Finnish sea areas. These results provide new insights into seafloor complexity in coastal sea areas, and further enable examining the ecological role and resource potential of seabed mineral concretions.

show abstract

Age and growth rates of ferromanganese concretions from the gulf of Finland derived from 210Pb measurements

Cited by 10 publications

References 7 publications

Morphology‐Dependent Magnetic Properties in Shallow‐Water Ferromanganese Concretions

Morphology‐Dependent Magnetic Properties in Shallow‐Water Ferromanganese Concretions

Nano-mineralogy and growth environment of Fe-Mn polymetallic crusts and nodules from the South China Sea

Extensive Coverage of Marine Mineral Concretions Revealed in Shallow Shelf Sea Areas

Contact Info

Product

Resources

About