Diagenesis of mollusc aragonite and the role of fluid reservoirs

Pederson, Chelsea L.; Mavromatis, Vasileios; Dietzel, Martin; Rollion‐Bard, Claire; Nehrke, Gernot; Jöns, Niels; Jochum, Klaus Peter; Immenhauser, Adrian

doi:10.1016/j.epsl.2019.02.038

Cited by 47 publications

(48 citation statements)

References 52 publications

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“…However, crystalline dolomite likely reflects burial diagenesis due to the lack of sedimentary fabrics and the most 18 O‐depleted values, and is thus excluded here as a viable palaeoenvironmental archive. Moreover, δ 18 O values of carbonates could be affected by variations in stoichiometry and ordering (Swart, ), or by varying rock : fluid ratios during diagenesis (Pederson et al ., ). Thus, oxygen isotopic values are not used here to unravel palaeoenvironment.…”

Section: Interpretation and Discussionmentioning

confidence: 97%

Formation, diagenesis and palaeoenvironmental significance of upper Ediacaran fibrous dolomite cements

Cai

Liu

et al. 2019

Sedimentology

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Neoproterozoic marine dolomite cements represent reliable, albeit complex, archives of their palaeoenvironment. Petrological and high-resolution geochemical data from well-preserved fibrous dolomite and pyrite in the upper Ediacaran (ca 551Á1 to 548Á0 Ma) Dengying Formation in south-west China are presented and discussed here. The aim of this research is to reconstruct the redox state of late Ediacaran shallow seawater and porewater in the Sichuan Basin using early marine diagenetic fabrics. Based on crystalline texture and axis, four basic types of fibrous dolomite cements formed penecontemporaneously in a microbialite reef setting at the platform margin: (i) bladed dolomites (replacement from a high-Mg calcite precursor); (ii) fascicular fast dolomites (replacement from an aragonitic precursor); (iii) fascicular slow dolomites; and (iv) radial slow dolomites. The latter two fabrics are considered direct marine porewater precipitates due to their length-slow character, cathodoluminescent zonation, and enriched copper and cobalt concentrations. Marine cements yield rare earth element and yttrium patterns comparable to modern seawater and represent a refined set of archive data relative to previously published bulk dolostones. Redox-sensitive elements and cathodoluminescence indicate that the fascicular fast dolomites formed in suboxic seawater, while fascicular slow and radial slow dolomites formed in euxinic marine porewaters. Microbial sulphate reduction during the formation of fascicular slow and radial slow dolomites is recognized by nanometre-scale spheroidal ankerite and sulphur-containing dolomite, and intergrown pyrite grains with U-shaped d 34 S transects. Data shown here suggest predominantly suboxic shallow late Ediacaran seawater and euxinic marine porewaters, with microbial activity promoting the direct precipitation of dolomite.

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Section: Interpretation and Discussionmentioning

confidence: 97%

Formation, diagenesis and palaeoenvironmental significance of upper Ediacaran fibrous dolomite cements

Cai

Liu

et al. 2019

Sedimentology

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“…It is controlled by a range of factors, such as river discharge (i.e., runoff), groundwater runout, ocean crust-seawater interaction, and diagenetic reflux of Sr into the sea following sediment recrystallization [49,50]. The latter is more important in marginal shallow seas, such as the Adriatic Sea, which has been the prime environment of carbonate deposition since the Triassic and whose diagenesis is rather complex, releasing considerable amounts of Sr in the microenvironment during dissolution of carbonate metastable phases [51,52], the best example being the aragonite-calcite transformation [53]. Strontium content of Adriatic seawater therefore reflects its carbonate-rich bedrock geology [54], while the bedrock geology of open oceans may be devoid of a substantial presence of carbonates as in the case of the French Atlantic coast [55].…”

Section: Discussionmentioning

confidence: 99%

Assignment of Gilthead Seabream Sparus aurata to Its Origin through Scale Shape and Microchemistry Composition: Management Implications for Aquaculture Escapees

Šegvić-Bubić

Talijančić

Vulić

et al. 2020

Water

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This study tests the suitability of the gilthead seabream scales as a proxy for origin selection in wild and anthropogenically pressured environments. Scale morphology and microchemistry were used to discriminate the habitat selection of two wild, farmed and wild farm-associated populations where landmark and outline-based scale morphometrics, trace-element chemistry and scale microstructure characteristics were analysed. The morphometric techniques successfully differentiated between the farmed and wild origin scale phenotypes. Reduced discrimination sensitivity between the wild and wild farm-associated origin was, however, reported. The discrimination based on microchemistry (B, Ba, Mn, K, Sr and Zn) classified the scales with high accuracy according to their origin (wild vs. farmed vs. wild farm-associated) and sampling locations, thus proving itself as a powerful tool in provenance study of gilthead seabream. Disparity in scale microstructure characteristics accounted for radii, circuli and inter-circulus spacing, hence unveiling the differences in growth and environmental conditions between the wild and farmed fish. In brief, scale shape was found to be a potent exploration tool for farmed fish identification, whereas scale microchemistry yielded a good resolution in identifying gilthead seabream membership among different habitats. Considering the importance of this species in aquaculture and fisheries throughout the Mediterranean, more research is needed to assess the usefulness of scales as nonlethal biogeochemical tags.

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“…subsamples were placed in individual stainless‐steel Teflon‐lined containers (Figure D,E) containing 25 ml of artificial diagenetic fluids produced in the laboratory. The two fluids used in this study are the same as those used in Pederson et al (), and include: (a) meteoric water (10 mM NaCl) and (b) burial fluid (100 mM NaCl + 10 mM MgCl 2 ). These fluids were chosen because of the frequency with which coral skeletons enter the meteoric diagenetic realm during relative sea‐level fluctuations, and alternatively, their exposure to shallow burial fluids.…”

Section: Materials and Methodologymentioning

confidence: 99%

Significance of fluid chemistry throughout diagenesis of aragonitic Porites corals – An experimental approach

Pederson

Weiss

Mavromatis

et al. 2019

The Depositional Record

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Marine carbonates are among the most important archives of environmental information in both modern and past environments. Widely used but particularly sensitive archives are the aragonitic skeletons of scleractinian corals. However, due to the metastable nature of aragonite, a multitude of chemical, mineralogical, and (micro)biological processes can lead to diagenetic alteration of these archives and their proxy information can be altered or lost. Here, hydrothermal alteration experiments were performed to create a better understanding of the diagenesis of an often‐utilized genus, Porites. Same‐specimen subsamples were heated in two fluid types and at two temperatures and durations, and their resulting alteration features were assessed to allow insight to the mechanisms and drivers of diagenetic modification. Experiments with fluid temperatures of 130°C induced remobilization and darkening of organic matrices, with no other evidence for alteration observed. In contrast, specimens exposed to a temperature of 160°C underwent significant diagenetic alteration dependent on fluid type. Fluid chemistry, particularly Mg/Ca ratios, was found to regulate the type of alteration (e.g. neomorphism or reprecipitation). Reaction with meteoric water resulted in almost complete neomorphism of the aragonite skeleton to blocky calcite, as well as significant exchange with the experimental fluid. In comparison, samples altered in the experimental burial fluids record no mineralogic or significant isotopic change, but instead, small‐scale dissolution–reprecipitation of the primary skeleton, along with the precipitation of pore‐filling aragonitic needle cements was observed. The δ18Ocarbonate data indicate transformation via dissolution–reprecipitation mechanisms depending on the degree and mechanism of diagenesis, and are strongly dependent on fluid chemistry. The main outcome of this work is that a multi‐proxy approach has the best potential to shed light on the interpretation of processes and pathways of aragonitic coral alteration. This study has implications for early alteration of carbonate archives within varying diagenetic fluids, with results aiding in the identification of past burial conditions.

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Diagenesis of mollusc aragonite and the role of fluid reservoirs

Cited by 47 publications

References 52 publications

Formation, diagenesis and palaeoenvironmental significance of upper Ediacaran fibrous dolomite cements

Formation, diagenesis and palaeoenvironmental significance of upper Ediacaran fibrous dolomite cements

Assignment of Gilthead Seabream Sparus aurata to Its Origin through Scale Shape and Microchemistry Composition: Management Implications for Aquaculture Escapees

Significance of fluid chemistry throughout diagenesis of aragonitic Porites corals – An experimental approach

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