New model of Si balance in the Late Cretaceous epicontinental European Basin

Jurkowska, Agata; Świerczewska-Gładysz, Ewa

doi:10.1016/j.gloplacha.2019.103108

Cited by 11 publications

(50 citation statements)

References 80 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During the Late Cretaceous, the present-day site of Chełm was located in the eastern part of the the Boreal Chalk Sea of Europe (Surlyk et al 13 ; Thibault et al 14 ; Wilmsen and Niebuhr 15 ). The Chełm chalk was laid down in an epicontinental (epiplatform) setting and was separated from the classical areas of chalk sedimentation in Denmark and northern Germany by an area in which sedimentation of spiculitic limestones, the so-called opokas, prevailed (e.g., Leszczyński 29 ; Jurkowska and Świerczewska-Gładysz 30 ). The current coordinates of the Chełm locality are 51.1303° N, 23.5303° E. According to GPlates Web Service 31 , the palaeo-position of this site (holotype of the subspecies, ZPAL Am.…”

Section: Geological Settingmentioning

confidence: 99%

Stable isotopes and predation marks shed new light on ammonoid habitat depth preferences

Machalski

Owocki

Dubicka

et al. 2021

Sci Rep

View full text Add to dashboard Cite

Ammonoids are extinct cephalopods with external shells which predominated in many late Paleozoic and Mesozoic marine ecosystems. Stable isotope data from ammonoid shells constitute primary tools for understanding their palaeohabitats. However, in most sedimentary successions globally the aragonitic shells of ammonoids are dissolved during fossilisation process and therefore not available for geochemical studies. We overcome this taphonomic bias by analysing the better preservable calcitic elements of the ammonoid jaws (aptychi). We study moulds and aptychi of two successive members, temporal subspecies in our interpretation, of a scaphitid evolutionary lineage from a Late Cretaceous chalk succession in Poland. In order to reconstruct their habitat depth preferences, we apply the powerful combination of stable isotope data from aptychi and co-occurring benthic and planktic foraminifera with an analysis of predation marks preserved on scaphitid specimens. On this basis we conclude that the populations of the older subspecies led a nektic, and those of the younger subspecies, a nektobenthic lifestyle. The shift in habitat depth preferences took place probably as a response of local populations to the shallowing of the sea. Previous studies largely assumed stable depth preferences for ammonoid species, genera and even higher clades. Our study casts doubts over such generalizations by pointing out that ammonoids could have been more flexible in their depth-related behaviour than anticipated.

show abstract

Section: Geological Settingmentioning

confidence: 99%

Stable isotopes and predation marks shed new light on ammonoid habitat depth preferences

Machalski

Owocki

Dubicka

et al. 2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The dissolution of skeletons of other sponges (with rigid skeletons) was a much slower process than the dissolution of loose spicules incorporated within the seabed mud (Maldonado et al., 2021; Rützler & Macintyre, 1978). The sluggishness of DSi diffusion in more resistant to dissolution sponge skeletons led to crystallization of smooth silica as a secondary infilling in sponge skeletons (Jurkowska & Świerczewska‐Gładysz, 2020a).…”

Section: Resultsmentioning

confidence: 99%

“…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 (2019), opoka does not disintegrate completely like chalk, but fragments composed of opal-CT lepispheres (spheres of blades, Wise & Kelts, 1972) are still preserved (Jurkowska & Świerczewska-Gładysz, 2020a).…”

Section: Quantitative Mineralogical Composition Of the Studied Rocksmentioning

confidence: 99%

“…The pH level was reduced only slightly and, therefore, only caused the dissolution of less resistant calcite polymorphs (Tynan & Opdyke, 2011), while the coccoliths, composed of low-Mg calcite, remained intact. The bacterial activity that occurred in this zone also caused the decomposition of organic membranes covering the skeletons of dead siliceous sponges (Jurkowska & Świerczewska-Gładysz, 2020a). 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.…”

Section: Below the Seabed Surface -Fe-mn Reduction Zonementioning

confidence: 99%

See 1 more Smart Citation

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

Jurkowska

2022

Global Biogeochemical Cycles

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…Soil Security Vol. 4 (2020) MOHAMED F. ABD EL-AZIZ elements in the earth ' s crust (Jurkowska and Świerczewska-Gładysz, 2020) may have an important role in increasing plant tolerance to water stress (Teixeira et al 2020).Thus, providing plant with Si has been adopted as an important treatment for alleviating the adverse implications of drought (Sithanantham et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

The effect of Si on minimizing the implications of water stress on tomato plants

Aziz¹

2020

EBSS

View full text Add to dashboard Cite

W ATER scarcity is a global issue especially in arid regions and rationalizing the use of fresh irrigation water has become necessary to satisfy water needs. The current study investigates using Si to alleviate the implications of water stress on tomato plants grown on a light textured soil. A split-plot experiment was conducted under the field conditions for two successive seasons (2017 and 2018) on tomato under two deficit irrigation levels i.e. 70 and 85% ET c as well as 100% ETc for comparison. Plants were subjected to two levels of silica foliar spray (0 and 0.4 mM). At physiological maturity growth stage, chemical characteristics of tomato fruits as well as total fruit yield were determined. Deficit irrigation decreased contents of chlorophyll A and B in leaves; while increased proline content in plant roots. This consequently decreased tomato fruit yield; while, raised its contents of total dissolved solids and vitamin C. On the other hand, spraying plants with Si raised significantly chlorophyll A and B in leaves and alleviated plant stress by increasing proline content in roots. This increased significantly fruit yield. Irrigation with 85% Et c with Si spray recorded a rather similar fruit yield to those irrigated with 100% Et c. Moreover, Si treatments increased significantly water use efficiency by the crop. Thus, Si spray can take part in saving considered amounts of water that can be used for irrigation of further tomato areas.

show abstract

New model of Si balance in the Late Cretaceous epicontinental European Basin

Cited by 11 publications

References 80 publications

Stable isotopes and predation marks shed new light on ammonoid habitat depth preferences

Stable isotopes and predation marks shed new light on ammonoid habitat depth preferences

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

The effect of Si on minimizing the implications of water stress on tomato plants

Contact Info

Product

Resources

About