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Nitrogen isotope fractionations among gaseous and aqueous NH4+, NH3, N2, and metal-ammine complexes: Theoretical calculations and applications
Download2021-02-15
Li, Long, He, Yuyang, Zhang, Zhe, Liu, Yun
Ammonium (NH4+), ammonia (NH3) and N2 are key nitrogen species in geological nitrogen recycling. NH3 has also been proposed to play an important role in mobilizing base metals in the form of metal-ammine complexes in hydrothermal fluids. The nitrogen isotope fractionation factors among these...
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Volcanic Influence on Atmospheric Sulfur Cycle in 2.7 Ga inferred from Multiple Sulfur Isotope Record of Pyrite Nodules in Black Shales from Nimbus, Western Australia
DownloadSpring 2018
Sulfur isotope compositions of Archean sulfide and sulfate minerals show mass-independent fractionation (S-MIF) signatures, which are characterized by non-zero Î33S and Î36S values. Producing the Archean S-MIF signal requires an O2-free atmosphere where broad-band UV radiation can penetrate to...
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Fall 2023
Houtaomuga site is located at the embankment of Lake Xinhuangpao in Da’an County of northeast China. Excavations from 2011 to 2015 revealed an occupation ranging from the early Neolithic period to late Liao Dynasty. This dissertation will focus on an unusual feature from the late Neolithic period...