Evolution of Late Cretaceous Si cycling reflected in the formation of siliceous nodules (flints and cherts)

Jurkowska, Agata; Świerczewska-Gładysz, Ewa

doi:10.1016/j.gloplacha.2020.103334

Cited by 5 publications

(24 citation statements)

References 82 publications

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“…Their skeletons, composed of biogenic opal‐A (BSi), started to dissolve and saturated the porewater with respect to DSi levels, generating a concentration favorable for opal‐CT precipitation. The BSi in the form of DSi migrated according to the Landmesser diffusion process (Landmesser, 1995) from the spicules of siliceous sponges without rigid skeletons, which were more prone to dissolution by the porewaters (Jurkowska & Świerczewska‐Gładysz, 2020b). Landmesser diffusion is a process of solution transport of DSi governed by the different chemical potentials of two sites occupied by variable silica polymorph phases.…”

Section: Resultsmentioning

confidence: 99%

“…Opoka differs from gaize (Cayeux, 1929; Sujkowski, 1931; Table 2) by the lower content of detrital quartz grains (<10% vs. 19% in gaize). Opoka is distinguished from marls by a lower content of clays (<10% vs. 20%; Table 2) and from cherts by a lower content of opal‐CT (<50%; Jurkowska & Świerczewska‐Gładysz, 2020b). After digestion of the opoka rock chips in HCl, according to a procedure described by Jurkowska et al.…”

Section: Resultsmentioning

confidence: 99%

“…The absence of secondary microtextures characteristic of the intermediate forms of silica polymorphs (e.g., opal‐CT/C; see Lynne et al., 2007), as well as silica overgrowths or variable silica polymorphs in one sample, suggests that the silica precipitated straight from solution during the early stages of diagenesis (Jurkowska & Świerczewska‐Gładysz, 2020a, 2020b; Lancelot, 1973). The process of silica crystallization was a one‐stage mechanism (without any precursors or intermediate forms), and the polymorphs were not transformed, for example, due to the maturation process to more mature phases of quartz (see discussion of Jurkowska & Świerczewska‐Gładysz, 2020b), during later stages of diagenesis.…”

Section: Resultsmentioning

confidence: 99%

“…Datasets for this research of the mineralogical composition and microtexture of selected samples are included in this papers: Jurkowska et al. (2019); Jurkowska and Świerczewska‐Gładysz (2020a, 2020b). This work was supported by the National Science Centre of Poland (Grant No.…”

Section: Acknowledgmentsmentioning

confidence: 99%

“…In the MVR, the middle Campanian‐lower Maastrichtian facies is composed of poorly bedded opoka with abundant fossils (Jurkowska & Świerczewska‐Gładysz, 2020a; Marcinowski & Radwański, 1983; Walaszczyk, 2012). Recently, published data (Jurkowska & Świerczewska‐Gładysz, 2020a, 2020b; Jurkowska et al., 2019) have been supplemented by new analyses performed in both regions. The newly studied sections, along with sections from which data have been used in the aforementioned previous studies, are summarized in Table 1.…”

Section: Geological Settingmentioning

confidence: 99%

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The Biotic‐Abiotic Control of Si Burial in Marine Carbonate Systems of the Pre‐Eocene Si Cycle

Jurkowska

2022

Global Biogeochemical Cycles

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The silicon (Si) cycle in the modern ocean might still be representative of some of the processes that occurred in the Si‐depleted post‐Eocene oceans resulting after the expansion of diatoms. However, silicon‐rich pre‐Eocene seas, where sponges and radiolarians were major Si users before the emergence of diatoms, were radically different from modern ocean scenarios. The spatial and temporal evolution of Si cycling in Earth history is recorded in geological deposits and could be reconstructed by petrographic and mineralogical analyses. The thick successions of carbonate siliceous rocks deposited in marine environments during the Paleozoic and Mesozoic indicate the significant role of Si outflow from the Si cycle via burial in sediments. The aim of this study is to fill an important gap in knowledge concerning the functioning of the main silicon sink in the oceans: burial in sediments. Si outflow from the marine biogeochemical Si cycle occurs via early diagenetic silica crystallization within seabed mud. The mechanisms leading to Si binding in silica minerals are a complex process controlled by abiotic global events, biological activity of silicifiers and geochemical conditions mediated by microbes. This study concentrates on reconstructions of the mechanisms of Si outflow from the Si cycle by silica polymorph crystallization below the seabed surface and was realized through mineralogical and microtextural analyses of the main components of Upper Cretaceous carbonate–siliceous rocks.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%