Carbon isotope fractionation during shale gas transport: Mechanism, characterization and significance
Sign Up to like & getrecommendations! Published in 2020 at "Science China Earth Sciences"
DOI: 10.1007/s11430-019-9553-5
Abstract: The gas in-place (GIP) content and the ratio of adsorbed/free gas are two key parameters for the assessment of shale gas resources and have thus received extensive attention. A variety of methods have been proposed… read more here.
Keywords: free gas; isotope fractionation; gas; carbon isotope ... See more keywords
Carbon isotope fractionation between amorphous calcium carbonate and calcite in earthworm-produced calcium carbonate
Sign Up to like & getrecommendations! Published in 2017 at "Applied Geochemistry"
DOI: 10.1016/j.apgeochem.2017.01.017
Abstract: In this study we investigate carbon isotope fractionation during the crystallization of biogenic calcium carbonate. Several species of earthworm including Lumbricus terrestris secrete CaCO3. Initially a milky fluid comprising micro-spherules of amorphous CaCO3 (ACC) is… read more here.
Keywords: fractionation; calcium carbonate; milky fluid; isotope fractionation ... See more keywords
Does sorption influence isotope ratios of chlorinated hydrocarbons under field conditions
Sign Up to like & getrecommendations! Published in 2017 at "Applied Geochemistry"
DOI: 10.1016/j.apgeochem.2017.07.016
Abstract: Abstract This study aims to investigate the effect of sorption on isotope ratios of chlorinated hydrocarbons migrating through the subsurface. For this purpose concentration and isotope ratio profiles (carbon and chlorine) were determined in saturated… read more here.
Keywords: isotope; field; sorption; isotope ratios ... See more keywords
Biotransformation and inhibition effects of hexachlorocyclohexanes during biogas production from contaminated biomass characterized by isotope fractionation concepts.
Sign Up to like & getrecommendations! Published in 2018 at "Bioresource technology"
DOI: 10.1016/j.biortech.2017.11.076
Abstract: Hexachlorocyclohexane (HCH) production for pesticides was banned by Stockholm Convention (2009) due to its harmful and adverse effects on the environment. Despite this measure, many areas contaminated with former HCH production-waste products still require management.… read more here.
Keywords: production; biogas production; contaminated biomass; biogas ... See more keywords
Effects of human activities on pedogenesis and iron dynamics in paddy soils developed on Quaternary red clays
Sign Up to like & getrecommendations! Published in 2018 at "Catena"
DOI: 10.1016/j.catena.2018.03.019
Abstract: Abstract A paddy soil chronosequence consisting of four profiles derived from Quaternary red clay (QRC) in Southern China with cultivation history from 0 to 300 years was studied to understand the underlying mechanisms and processes controlling… read more here.
Keywords: quaternary red; paddy soil; paddy soils; isotope fractionation ... See more keywords
Variations of stable isotope fractionation during bacterial chromium reduction processes and their implications
Sign Up to like & getrecommendations! Published in 2018 at "Chemical Geology"
DOI: 10.1016/j.chemgeo.2018.02.004
Abstract: Abstract Many chemical processes generate subtle but readily measured changes in isotope compositions of elements across the periodic table. The elements involved therefore carry diagnostic information about their chemical histories in complex geochemical or biochemical… read more here.
Keywords: reduction; fractionation; reduction rates; fractionation factors ... See more keywords
A global assessment of Zn isotope fractionation in secondary Zn minerals from sulfide and non-sulfide ore deposits and model for fractionation control
Sign Up to like & getrecommendations! Published in 2018 at "Chemical Geology"
DOI: 10.1016/j.chemgeo.2018.09.033
Abstract: Abstract We investigated extent and direction of Zn isotope fractionation in secondary zinc minerals formed during low temperature hydrothermal and/or supergene oxidation of primary sulfide deposits. Zinc isotope data have been obtained from non-sulfide zinc… read more here.
Keywords: sulfide; fractionation; non sulfide; zinc ... See more keywords
Simulating speleothem growth in the laboratory: Determination of the stable isotope fractionation (δ13C and δ18O) between H2O, DIC and CaCO3
Sign Up to like & getrecommendations! Published in 2019 at "Chemical Geology"
DOI: 10.1016/j.chemgeo.2018.12.012
Abstract: Abstract Here we present novel cave-analogue experiments directly investigating stable carbon and oxygen isotope fractionation between the major involved species of the carbonate system (HCO3−, CO2, CaCO3 and H2O). In these experiments, which were performed… read more here.
Keywords: isotope; caco3; isotope fractionation; fractionation ... See more keywords
Molecular simulations of kinetic stable calcium isotope fractionation at the calcite-aqueous interface
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DOI: 10.1016/j.chemgeo.2019.119315
Abstract: Abstract The measurement of calcium stable isotope fractionation during crystal growth can provide insights into the dominant pathways and mechanisms of crystal growth, but these interpretations require a detailed understanding of mass dependent reaction rates… read more here.
Keywords: kinetic stable; isotope; ion; calcium ... See more keywords
Triple oxygen isotope fractionation between CaCO3 and H2O in inorganically precipitated calcite and aragonite
Sign Up to like & getrecommendations! Published in 2020 at "Chemical Geology"
DOI: 10.1016/j.chemgeo.2020.119500
Abstract: Abstract Carbonate bearing materials, such as foraminifera, mollusks shells, or speleothems, have the potential to preserve geochemical and isotopic signatures reflecting the environmental conditions at the time they formed. Beyond the conventional δ18O, information from… read more here.
Keywords: caco3; oxygen isotope; fractionation; triple oxygen ... See more keywords
Silicon isotopic fractionation during metamorphic fluid activities: constraints from eclogites and ultrahigh-pressure veins in the Dabie orogen, China
Sign Up to like & getrecommendations! Published in 2020 at "Chemical Geology"
DOI: 10.1016/j.chemgeo.2020.119550
Abstract: Abstract To understand Si isotope fractionation during metamorphic fluid activities in the subduction zone, this study presents the Si isotopic compositions of two high- to ultrahigh-pressure (HP–UHP) eclogite–vein systems from the Ganghe and Hualiangting areas… read more here.
Keywords: fractionation metamorphic; fractionation; fluid; metamorphic fluid ... See more keywords