* If you want to update the article please login/register
Dependent on their mass, stable isotopes of a molecule will clump together in many combinations. Even for simple molecules such as O2, 17 O, and 18 O, which can contain 16 O, 17 O, and 18 O in various combinations, clumped isotopes can often reveal the temperatures at which molecules are formed. Wang et al. , al. , are both similar to Wang et al. Temperatures at which microbially produced methane forms were shown by kinetic factors leading to equilibrium shifts.
Source link: https://doi.org/10.1126/science.aaa4326
Abstract Methane seep deposits, which made up large, carbonate-rich mounds of hydrocarbon seepage, are widely distributed in the late Cretaceous Western Interior Seaway of North America. The average clumped isotope paleotemperature from the micritic carbonates is 23 °C, which corresponds to bottom water paleotemperatures derived from 18O measurements of MDACs and well-preserved mollusk shells at similar localities in the WIS. Our results are inconsistent with previously reported measurements on Campanian seawater 18Ow from fossil mollusk shells, but above younger fossils from other locations in the WIS, and we suggest that fossil MDAC deposits be used as paleotemperature archives.
Source link: https://doi.org/10.1130/b35846.1
Abstract Methane clumped-isotope compositions provide a new insight into the formation of methane from both biogenic and thermogenic sources. Here we discuss the use of methane clumped-isotope tests for investigating the source of methane in the subsurface. We then place these results in the context of standard frameworks for determining the formation of methane in the context of common frameworks, including the use of methane 13 C and D values and C 2–3 ratios. Lastly, we conclude that we provide a framework for how methane clumped isotopes can be used to determine methane accumulations.
Source link: https://doi.org/10.1144/sp468.3
* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions