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Biogenic and Abiotic Carbonates in Altered Oceanic Crust (AOC) and Implications to Subduction Zone Carbon Cycle
DownloadFall 2017
Altered oceanic crust (AOC) is an important carbon reservoir for subduction-zone carbon recycling. However, the character of the carbon reservoir (e.g., total budget and isotopic signatures) in AOC has not been well constrained. Here, based on analyses of contents and isotope compositions of 73...
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Experimental determination of nitrogen isotope fractionation associated with NH3 degassing at 0-70 ºC
DownloadFall 2017
Ammonia degassing is a common process in natural alkaline water systems (e.g., hydrothermal vents). Nitrogen isotope fractionation factor is an important parameter to quantitatively assess the nitrogen cycle in these systems, but still not constrained yet. In this study, we carried out laboratory...
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Identify Metamorphic and Primary Multiple Sulfur Isotopic Signatures in the 2.7 Ga Pyrite Nodules from the Southwestern Superior Province (Minnesota, USA)
DownloadSpring 2016
Sulfur isotopes of some Archean rocks show unique mass independent fractionation (S-MIF) signatures, which are generally considered to have been produced by UV radiolysis on volcanic SO2 in the oxygen-free Archean atmosphere. Based on the distinct S-MIF signals of different sulfur sources (i.e.,...
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Isotopic Insights into the Origin of Dissolved Sulfate and the Sulfate-supported Microbial Processes in Deep Subsurface Fracture Waters in the Witwatersrand Basin, South Africa
DownloadSpring 2017
Subsurface groundwater has been discovered from rock fractures in Precambrian cratons worldwide. In the Witwatersrand Basin (South Africa), the fracture waters show residence times in the order of 1 to 100 million years. Interestingly, sulfate-reducing bacteria are widespread in these fracture...
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Quantification of nitrogen in subducting slabs and its recycling in the forearc and sub-arc regions
DownloadSpring 2023
Nitrogen, a life-essential element, is exchanged between Earth’s surface and interior through subduction, which has been acting as a dominant driving force regulating the long-term evolution of Earth’s major N reservoirs. However, the nitrogen input fluxes into global subduction zones and the...