On the delimitation of the carbonate burial realm

Abstract

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Turtle eggs from the Lower Cretaceous Hasandong Formation (South Korea) with relict aragonite under significant thermal maturity

“…2; Lawver & Jackson, 2014), it may be a favorable condition for the preservation of aragonite even under geothermally unfavorable conditions (Fig. 7), which may be a ‘very low grade metamorphism’ diagenesis regime of which the burial depth is deeper than 12–15 km and burial temperature is higher than 250°C (see Immenhauser, 2022:table 3).…”

Constraining the diagenesis of the Puga cap carbonate from U–Pb in‐situ dating of seafloor crystal fans, southern Amazonian craton, Brazil

“…Thus, it is interpreted that the 623 ± 3 (9) Ma interval constrains final filling and diagenetic stabilization of the PCC fabric in the transition from shallow to intermediate burial conditions (Figure 6) (<100°C, ~750 m; Immenhauser, 2021). Overlapping δ 13 C carb and slight variation in the δ 18 O carb values in different carbonate generations reflect the larger resilience of these isotope systems to diagenetic alteration in low fluid/carbonate ratios (Immenhauser, 2021).…”

“…Thus, it is interpreted that the 623 ± 3 (9) Ma interval constrains final filling and diagenetic stabilization of the PCC fabric in the transition from shallow to intermediate burial conditions (Figure 6) (<100°C, ~750 m; Immenhauser, 2021). Overlapping δ 13 C carb and slight variation in the δ 18 O carb values in different carbonate generations reflect the larger resilience of these isotope systems to diagenetic alteration in low fluid/carbonate ratios (Immenhauser, 2021). The larger error of the previous Pb–Pb dating of the PCC (±33 Myr) may be attributed to the low spatial resolution of this method, which averages chemical compositions of different carbonate generations leading to data scatter (Smith et al, 1991; Roberts et al, 2020).…”

“…Stabilization of carbonate fabric in 5 Myr from Richter and DePaolo (1987). Increased porosity loss in muddy carbonates according to Immenhauser (2021). Eustatic curve from Nogueira et al (2007).…”

Comment on Brandano et al. (2022) – Introduction of ‘Understanding carbonate factories through palaeoecological and sedimentological signals – Tribute to Luis Pomar’, Sedimentology, 69, 5–23

“…Finally, the carbonate mineralogy of skeletal sediment producers and non‐skeletal grains, may vary for different living habitats as the skeletal sediment producers will adopt to changing environmental conditions and consequently will produce sediment with varying sensitivity to diagenetic modification directly at the seafloor and during early burial. These processes ultimately will not only determine sediment preservation, but also sediment retention (for a recent overview see Immenhauser, 2021) through cementation at the seafloor (e.g. Shinn, 1969; Ge et al ., 2020a,b) or microbial binding (e.g.…”