Triple oxygen isotope systematics of diagenetic recrystallization of diatom opal-A to opal-CT to microquartz in deep sea sediments

Ibarra, Daniel E.; Yanchilina, Anastasia; Lloyd, Max K.; Methner, Katharina; Chamberlain, C. Page; Yam, Ruth; Shemesh, Aldo; Stolper, Daniel A.

doi:10.1016/j.gca.2021.11.027

Cited by 16 publications

(17 citation statements)

References 86 publications

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“… (a) Triple O‐isotope compilation of chert and silica measurements across the geological time scale (Hayles et al., 2019; Ibarra et al., 2022; Levin et al., 2014; Liljestrand et al., 2020; Lowe et al., 2020; Sengupta et al., 2020; Sharp et al., 2016; Zakharov, Marin‐Carbonne, et al., 2021). The points are color‐coded according to their age.…”

Section: Discussionmentioning

confidence: 99%

“…The gray, pink, and blue dashed lines represent mixing between the original silica (e.g., post-mortem diatoms) and the diagenetic silica that is calculated from the respective geothermal and pore water profiles. The data points color-coded by age represent seafloor-drilled cherts from (Ibarra et al, 2022) and this study. (Hayles et al, 2019;Ibarra et al, 2022;Sengupta et al, 2020;Sharp et al, 2016;Zakharov, Marin-Carbonne, et al, 2021) (see Zakharov, Tanaka, et al, 2021), although the range of values is more limited compared to the marine pore water fluids (see Figure 11).…”

Section: The δ′ 18 O-δ′ 17 O Systematics Of Deep-sea Chertsmentioning

confidence: 99%

“…Such fluids may be present in case of high-temperature (>250°C) alteration of seafloor basalts. The silica δ′ 18 O-Δ′ 17 O are compiled from diatoms, seafloor-drilled cherts, subaerial Monterey, Fisco and Mishash formations as well as the Stevns Klint chert(Hayles et al, 2019;Ibarra et al, 2022;Sengupta et al, 2020;Sharp et al, 2016;Zakharov, Marin-Carbonne, et al, 2021) and this study. (b) The same diagram with enlarged scales in the range of our samples measured by secondary ion mass spectrometry (SIMS).…”

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confidence: 99%

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In‐Situ and Triple Oxygen Isotope Characterization of Seafloor Drilled Cherts: Marine Diagenesis and Its Bearing on Seawater Reconstructions

Zakharov

Marin‐Carbonne

Pack

et al. 2023

Geochem Geophys Geosyst

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The oxygen isotope composition (δ 18 O) of marine carbonates is a well-established proxy for the Cenozoic climate (Lisiecki & Raymo, 2005;Zachos et al., 2001). With small corrections for diagenesis and changes in the δ 18 O of seawater, the δ 18 O of marine carbonates are used to quantitatively estimate ocean temperatures across the last 65 Ma with a sensitivity of about 1°C and high temporal accuracy (e.g., Raymo et al., 2018). The principle of isotope thermometry is based on the temperature-dependent fractionation of oxygen isotopes between co-existing marine carbonates and seawater (Epstein et al., 1951). Consequently, oxygen isotope thermometry bears a Abstract Cherts are used to reconstruct the evolution of seawater δ 18 O and temperature over geological time. However, given the influence of marine diagenesis, reconstructing seawater from the isotope composition of cherts is not straightforward, resulting in ambiguity of interpretation. Here, we present a detailed isotope and petrographic investigation of deep-sea drilled 135-40 Ma cherts with focus on the effects of marine diagenesis. We combined triple O-isotope data with in-situ δ′ 18 O-16 OH/ 16 O measurements using secondary ion mass spectrometry (SIMS). We also provide electron microprobe maps, traditional δ′ 18 O measurements from petrographically diverse domains, and δD and H 2 O wt.% values. The bulk δ′ 18 O values range between 29‰ and 38‰ in our collection, while SIMS δ′ 18 O data reveal significant intra-sample heterogeneities up to 6‰ related to distinct petrographic features (e.g., filled radiolarian tests) and to micrometer-scale variations in silica forms. Further, the δ′ 18 O-Δ′ 17 O values of these seafloor-drilled cherts plot near and under equilibrium curve. Both triple-O and SIMS δ′ 18 O results reflect diagenesis in presence of marine pore waters at temperatures higher than ambient seawater, which is especially appreciable in cherts deposited on young oceanic crust. Despite the relatively constant δ 18 O seawater values over last 135 Ma, the marine silica spanning between 0 and 135 Ma occupies a wide compositional space in the δ′ 18 O-Δ′ 17 O rather than an equilibrium curve. The δ′ 18 O values of cherts from modern-seafloor positively correlate with the oceanic crustal age at the time of deposition, hinting at the importance of the heat flux in the diagenetic recrystallization of marine silica.Plain Language Summary Chemical sediments extracted from seafloor represent an archive of ocean temperatures and solutes. Chemical resilience of siliceous sediments with composition of >90 wt.% SiO 2 presents a promising avenue to constrain temperature of ancient oceans from distant geological epochs. However, such rocks termed cherts undergo complex recrystallization during compaction and lithification below the seafloor, preventing direct measurements of ocean temperatures. To isolate the effect of diagenesis, we carefully investigated several Mesozoic and Cenozoic seafloor-drilled cherts. We used oxygen isotope ratios as a common proxy for te...

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Section: Discussionmentioning

confidence: 99%

Section: The δ′ 18 O-δ′ 17 O Systematics Of Deep-sea Chertsmentioning

confidence: 99%

mentioning

confidence: 99%

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In‐Situ and Triple Oxygen Isotope Characterization of Seafloor Drilled Cherts: Marine Diagenesis and Its Bearing on Seawater Reconstructions

Zakharov

Marin‐Carbonne

Pack

et al. 2023

Geochem Geophys Geosyst

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“…Briefly, 2-3 mg opal samples were loaded into nickel reaction tubes as described in ref. 69 and heated for 2 hours at 250 ºC at high vacuum. Samples were then repeatedly pre-fluorinated at room temperature with 30 mbar aliquots of BrF5 until <1 mbar of non-condensable gas was present.…”

Section: Stable Isotopic Analysesmentioning

confidence: 99%

“…The generated O2 gas is then sequentially released into the cleanup line, cryogenically cleaned and frozen onto a 5Å mole sieve trap immersed in liquid nitrogen, equilibrated at room temperature with the IRMS dual-inlet sample-side bellows and measured for δ 18 O against a reference tank of known δ 18 O composition (24.3‰) (for details refs. 68,69 ). Opal δ 18 O is reported based on daily corrections made to four primary silicate standards (NBS-28, UWG-2, SCO and L1/UNM_Q, which are quartz, garnet, olivine and quartz, respectively), spanning ~13‰, and have been recently calibrated to the VSMOW2-SLAP2 scale 66,70 .…”

Section: Stable Isotopic Analysesmentioning

confidence: 99%

A Radiometrically Dated Record of Antarctic Ice Sheet Response to Millennial-Scale Climate Cycles during Glacials and Interglacials

Piccione

Blackburn²,

Tulaczyk

et al. 2022

Preprint

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Records of changing ice mass in offshore sediments and ice cores suggest that the West Antarctic ice sheet experienced millennial-scale ice loss during the last termination. However, the distal location and short temporal coverage of these records leads to uncertainty in both the spatial footprint of ice response, and whether this response persists outside of glacial terminations. Here we present a >100kyr archive of episodic Antarctic ice sheet basal melt events recorded by mineralogic variation in subglacial precipitates. 234U-230Th dates for two precipitates are used to build a time series of 32 opal-calcite transitions that correspond to Late Pleistocene millennial-scale climate cycles, with precipitation of opal during cold periods and calcite during warm periods. Geochemical data indicate that opal precipitation occurs via cryoconcentration of silica in brines beneath the ice sheet margin, while calcite precipitation is triggered by the addition of subglacial meltwater originating from the ice sheet interior. These freeze-flush cycles represent changes in subglacial hydrologic-connectivity driven by ice sheet velocity fluctuations, which likely occur in response to Southern Ocean thermal forcing acting on grounding lines within the Ross Embayment. Our results suggest that oscillating temperatures in the Southern Ocean affect the mass of the Antarctic ice sheet by regulating the delivery of heat to buttressing ice shelves and grounding lines on millennial timescales, regardless of the background climate state.

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Demystifying diagenesis: The future of diagenetic inquiry in the geosciences

Fantle,

Lloyd

2025

Treatise on Geochemistry

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Triple oxygen isotope systematics of diagenetic recrystallization of diatom opal-A to opal-CT to microquartz in deep sea sediments

Cited by 16 publications

References 86 publications

In‐Situ and Triple Oxygen Isotope Characterization of Seafloor Drilled Cherts: Marine Diagenesis and Its Bearing on Seawater Reconstructions

In‐Situ and Triple Oxygen Isotope Characterization of Seafloor Drilled Cherts: Marine Diagenesis and Its Bearing on Seawater Reconstructions

A Radiometrically Dated Record of Antarctic Ice Sheet Response to Millennial-Scale Climate Cycles during Glacials and Interglacials

Demystifying diagenesis: The future of diagenetic inquiry in the geosciences

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