Decoupling feldspar dissolution and precipitation rates at near-equilibrium with Si isotope tracers: Implications for modeling silicate weathering

2020 ◽  
Vol 271 ◽  
pp. 132-153 ◽  
Author(s):  
Chen Zhu ◽  
J. Donald Rimstidt ◽  
Yilun Zhang ◽  
Jinting Kang ◽  
Jacques Schott ◽  
...  
Keyword(s):  
Silicate Weathering ◽  
Isotope Tracers ◽  
Si Isotope ◽  
Feldspar Dissolution ◽  
Dissolution And Precipitation

Testing hypotheses of albite dissolution mechanisms at near-equilibrium using Si isotope tracers

2021 ◽  
Vol 303 ◽  
pp. 15-37
Author(s):  
Chen Zhu ◽  
Yilun Zhang ◽  
J. Donald Rimstidt ◽  
Lei Gong ◽  
Joseph A.C. Burkhart ◽  
...  
Keyword(s):  
Testing Hypotheses ◽  
Isotope Tracers ◽  
Si Isotope

Assessment of C, N and Si isotope tracers associated to past ocean productivity

2020 ◽  
Author(s):  
Jesse Farmer ◽  
Jennifer Hertzberg ◽  
Damien Cardinal ◽  
Susanne Fietz ◽  
Katharine Hendry ◽  
...  
Keyword(s):  
Isotope Tracers ◽  
Ocean Productivity ◽  
Si Isotope

Time-dependent cortisol turnover in tissues using stable isotope tracers and MALDI Mass Spectrometry (MS) sampling

2018 ◽  
Author(s):  
Shazia Khan ◽  
Diego F Cobice ◽  
Dawn EW Livingstone ◽  
C Logan Mackay ◽  
Scott P Webster ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Stable Isotope ◽  
Maldi Mass Spectrometry ◽  
Time Dependent ◽  
Stable Isotope Tracers ◽  
Isotope Tracers

SILICATE WEATHERING AND MIDDLE DEVONIAN PALEOCLIMATE

2020 ◽  
Author(s):  
Teresa D. Avila ◽  
◽  
Matthew R. Saltzman ◽  
Elizabeth M. Griffith ◽  
Michael M. Joachimski
Keyword(s):  
Middle Devonian ◽  
Silicate Weathering

scholarly journals Co-variation of silicate, carbonate and sulfide weathering drives CO2 release with erosion

2021 ◽  
Vol 14 (4) ◽  
pp. 211-216
Author(s):  
Aaron Bufe ◽  
Niels Hovius ◽  
Robert Emberson ◽  
Jeremy K. C. Rugenstein ◽  
Albert Galy ◽  
...  
Keyword(s):  
Erosion Rate ◽  
Global Climate ◽  
Stream Water ◽  
Sulfide Oxidation ◽  
Silicate Weathering ◽  
Emission Rates ◽  
Mountain Ranges ◽  
Weathering Rates ◽  
Southern Taiwan ◽  
Co2 Release

AbstractGlobal climate is thought to be modulated by the supply of minerals to Earth’s surface. Whereas silicate weathering removes carbon dioxide (CO2) from the atmosphere, weathering of accessory carbonate and sulfide minerals is a geologically relevant source of CO2. Although these weathering pathways commonly operate side by side, we lack quantitative constraints on their co-variation across erosion rate gradients. Here we use stream-water chemistry across an erosion rate gradient of three orders of magnitude in shales and sandstones of southern Taiwan, and find that sulfide and carbonate weathering rates rise with increasing erosion, while silicate weathering rates remain steady. As a result, on timescales shorter than marine sulfide compensation (approximately 106–107 years), weathering in rapidly eroding terrain leads to net CO2 emission rates that are at least twice as fast as CO2 sequestration rates in slow-eroding terrain. We propose that these weathering reactions are linked and that sulfuric acid generated from sulfide oxidation boosts carbonate solubility, whereas silicate weathering kinetics remain unaffected, possibly due to efficient buffering of the pH. We expect that these patterns are broadly applicable to many Cenozoic mountain ranges that expose marine metasediments.

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