Global perturbations of carbon cycle during the Triassic–Jurassic transition recorded in the mid-Panthalassa

Thermogenic carbon release from the Central Atlantic magmatic province caused major end-Triassic carbon cycle perturbations

“…T he end-Triassic extinction (ETE) was one of the largest mass extinctions in Earth history. The ETE coincided with several major carbon cycle disturbances, as evidenced by increases in atmospheric CO 2 concentrations (1-3) and negative carbon isotope excursions (CIEs) recorded in both carbonate and organic matter records (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16). The first disruption of the carbon cycle is marked by the late Triassic Marshi/precursor CIE (hereby referred to as CIE 1), followed by the Spelae/initial CIE around the Triassic-Jurassic (T-J) boundary (CIE 2), and finally the Tilmanni/main CIE in the earliest Jurassic (CIE 3).…”

“…High-precision U-Pb dating demonstrates that these sills were emplaced synchronously with the ETE (20,21). It has been suggested that thermogenic carbon release associated with CAMP emplacement in volatile-rich sedimentary basins could explain the negative CIEs (10,13,20,21), but this has not yet been explored from a carbon cycle modeling approach. Furthermore, previous carbon cycle models have mainly focused on the Spelae excursion (CIE 2), which was interpreted to coincide with the ETE (5-7, 14, 18).…”

Anthropogenic-scale CO2 degassing from the Central Atlantic Magmatic Province as a driver of the end-Triassic mass extinction

“…A general short-term ocean acidification, mainly affecting the benthic communities, likely triggered a long-term biotic crisis (Hautmann, 2004;Kiessling and Simpson, 2011;Greene et al, 2012;Hönisch et al, 2012;Martindale et al, 2012;Fujisaki et al, 2018). The occurrence of ocean acidification during the end-Triassic extinction interval is testified by a decline of carbonate productivity (Clémence et al, 2010;Greene et al, 2012).…”

Gold-coated silver capsule for elemental analyzer-isotope ratio mass spectrometer: Robust against pretreatment of rock material for organic carbon and δ¹³C analyses

“…Organic C (OC) and stable C isotope ratios (δ 13 C org ) in sediments, soils, and rocks are useful geochemical proxies that record information about the sedimentary environment and the origin and diagenesis of organic matter. The most popular method for quantifying the OC and δ 13 C org data of environmental samples is elemental analyzer-isotope ratio mass spectrometry (EA-IRMS) (Kuroda et al, 2007;Larson et al, 2008;Isaji et al, 2020;Brodie et al, 2011; further divided into acid wash (Fujisaki et al, 2016(Fujisaki et al, , 2018(Fujisaki et al, , 2019, acid fumigation (Komada et al, 2012;Walthert et al, 2010;Ramnarine et al, 2011), and capsule methods (Verardo et al, 1990;Lohse et al, 2000;Niuwenhuize et al, 1994;Lasron et al, 2008). Each method has its advantages and disadvantages.…”