Results 21 to 30 of about 9,785 (280)

Oxygen Isotopes and Volatiles in Martian Meteorite [PDF]

, 2013
Oxygen isotopes were measured in mineral separates from martian meteorites using laser fluorination and were found to be remarkably uniform in both δ18O and Δ17O, suggesting that martian magmas did not assimilate aqueously altered crust regardless of any
Channon, Melanie Beth
core   +1 more source

Holocene Spatiotemporal Redox Variations in the Southern Baltic Sea

Frontiers in Earth Science, 2021
Low oxygen conditions in the modern Baltic Sea are exacerbated by human activities; however, anoxic conditions also prevailed naturally over the Holocene. Few studies have characterized the specific paleoredox conditions (manganous, ferruginous, euxinic)
Dalton S. Hardisty, Natascha Riedinger, Noah J. Planavsky, Dan Asael, Steven M. Bates, Timothy W. Lyons   +5 more
doaj   +1 more source

Microbial communities and their roles in the Cenozoic sulfurous oil reservoirs in the Southwestern Qaidam Basin, Western China

Scientific Reports, 2023
The latest discovery of sulfurous natural gas marked a breakthrough in the Cenozoic natural gas exploration in the southwestern margin of Qaidam Basin. The 16S rRNA analyses were performed on the crude oil samples from H2S-rich reservoirs in the Yuejin ...
Yue Jiao, Liyun An, Wei Wang, Jian Ma, Chaodong Wu, Xiaolei Wu   +5 more
doaj   +1 more source

Paleoarchean sulfur cycling: Multiple sulfur isotope constraints from the Barberton Greenstone Belt, South Africa [PDF]

, 2015
Mass-dependent and mass-independent sulfur isotope fractionation archived in volcanic and sedimentary rocks from the Barberton Greenstone Belt (3550-3215. Ma), South Africa, provide constraints for sulfur cycling on the early Earth. Four different sample
Farquhar, J., Beukes, N. J., Beukes, Nicolas J., Strauss, H., Montinaro, Alice, Strauss, Harald, Schwarz-Schampera, Ulrich, Münker, Carsten, Arndt, N. T., Montinaro A., NWO-NSO: Testing the robustness of the sulfur stable isotope biomarker and paleoredox indicator for planetary exploration, Mason, Paul R D, Petrology, Mason, P. R. D., Roerdink, Desiree, Peters, Marc, Gutzmer, J., Gutzmer, Jens, Farquhar, James, Schwarz-Schampera, U., Roerdink, D., Peters, M., Arndt, Nicholas T., Munker, C.   +23 more
core   +1 more source

Triple sulfur-oxygen-strontium isotopes probabilistic geographic assignment of archaeological remains using a novel sulfur isoscape of western Europe.

PLoS ONE, 2021
Sulfur isotope composition of organic tissues is a commonly used tool for gathering information about provenance and diet in archaeology and paleoecology.
Clément P Bataille, Klervia Jaouen, Stefania Milano, Manuel Trost, Sven Steinbrenner, Éric Crubézy, Rozenn Colleter, Rozenn Colleter   +7 more
doaj   +1 more source

Sulfur Isotope Evidence for a Geochemical Zonation of the Samoan Mantle Plume

Geochemistry, Geophysics, Geosystems, 2021
Basalts from the Samoan volcanoes sample contributions from all of the classical mantle endmembers, including extreme EM II and high 3He/4He components, as well as dilute contributions from the HIMU, EM I, and DM components.
James W. Dottin III, Jabrane Labidi, Matthew G. Jackson, James Farquhar   +3 more
doaj   +1 more source

Evidence for life in the isotopic analysis of surface sulphates in the Haughton impact structure, and potential applications on Mars [PDF]

, 2012
The analysis of sulphur isotopic compositions in three sets of surface sulphate samples from the soil zone in the Haughton impact structure shows that they are distinct.
Izawa, M.R.M., Osinski, G.R., Boyce, A.J., Banerjee, N., Lee, P., Parnell, J., Flemming, R., Matthew, R.M.   +7 more
core   +1 more source

Calculations of Thermodynamic Sulfur Isotope Effect [PDF]

Journal of Nuclear Science and Technology, 1985
The isotopic reduced partition function ratios (RPFR), (s/s')f, for the 34S/32S isotopic pair were calculated for 24 sulfur compounds between 10 and 2,000K. Their magnitudes were in the following sequences; at low enough temperatures at which In(s/s')f depends only on the isotopic difference in frequency-sum, SF6>SO2F2>SF5Cl>SF5Br>SO4 2->SO2Cl2>SO3 ...
OI, Takao, TAGUMA, Naoko, KAKIHANA, Hidetake   +2 more
openaire   +1 more source

Off limits: sulfate below the sulfate-methane transition

Frontiers in Earth Science, 2016
One of the most intriguing recent discoveries in biogeochemistry is the ubiquity of cryptic sulfur cycling. From subglacial lakes to marine oxygen minimum zones, and in marine sediments, cryptic sulfur cycling – the simultaneous sulfate consumption and ...
Benjamin Brunner, Gail Lee Arnold, Hans Røy, Inigo A Müller, Bo Barker Jørgensen   +4 more
doaj   +1 more source

Stable and radiogenic isotopes as tracers for soil degradation [PDF]

, 2008
Soil erosion seriously threatens mountain slopes. Direct measurement of soil erosion in the field is difficult and needs long term recording. However, stable and radiogenic isotopes are potential tracers for soil erosion estimation and would enable a ...
Schaub, Monika
core   +1 more source