Equilibrium clumped-isotope effects in doubly substituted isotopologues of ethane
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چکیده
منابع مشابه
“Clumped-isotope” geochemistry—The study of naturally-occurring, multiply-substituted isotopologues
Clumped isotope geochemistry is concerned with the state of ordering of rare isotopes in natural materials. That is, it examines the extent to which rare isotopes (D, C, N, O, etc.) bond with or near each other rather than with the sea of light isotopes in which they swim. Abundances of isotopic ‘clumps’ in natural materials are influenced by a wide variety of factors. In most cases, their conc...
متن کاملA process-based model for non-equilibrium clumped isotope effects in carbonates
Article history: Received 30 May 2015 Received in revised form 26 August 2015 Accepted 28 September 2015 Available online xxxx Editor: H. Stoll
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High precision measurements of molecules containing more than one heavy isotope may provide novel constraints on element cycles in nature. These so-called clumped isotope signatures are reported relative to the random (stochastic) distribution of heavy isotopes over all available isotopocules of a molecule, which is the conventional reference. When multiple indistinguishable atoms of the same e...
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The reaction of CO2 hydration/dehydration controls the oxygen isotopic composition in both carbonate minerals and atmospheric CO2 through the exchange of oxygen isotopes with water. The use of O as an environmental indicator typically assumes isotopic equilibrium, namely full oxygen isotope exchange between CO2 and water. Clumped isotopes is a new isotopic tracer that is used in both CaCO3 and ...
متن کاملMethane seep carbonates yield clumped isotope signatures out of equilibrium with formation temperatures
Methane cold seep systems typically exhibit extensive buildups of authigenic carbonate minerals, resulting from local increases in alkalinity driven by methane oxidation. Here, we demonstrate that modern seep authigenic carbonates exhibit anomalously low clumped isotope values (Δ47), as much as ∼0.2‰ lower than expected values. In modern seeps, this range of disequilibrium translates into appar...
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ژورنال
عنوان ژورنال: Geochimica et Cosmochimica Acta
سال: 2017
ISSN: 0016-7037
DOI: 10.1016/j.gca.2016.10.001