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Ariel D. Anbar
Arizona State University
368Publications
57H-index
11.7kCitations
Publications 385
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Abstract Multiple attempts have been made using the ancient shale record to track the molybdenum isotope composition (δ98Mo) of seawater during the final two-hundred million years of the Archean Eon (2.7 to 2.5 billion-years-ago, or Ga). This seawater δ98Mo value is important because it should have scaled with levels of ocean oxygenation during the runup to the Great Oxidation Event. Unfortunately, however, it is difficult to tell if the majority of the existing late-Archean shale δ98Mo record t...
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#1Feifei ZhangH-Index: 7
#2Shuhai Xiao (VT: Virginia Tech)H-Index: 54
Last.Ariel D. Anbar (ASU: Arizona State University)H-Index: 57
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#1Aleisha C. Johnson (ASU: Arizona State University)H-Index: 1
#2S.M. Aarons (UCSD: University of California, San Diego)H-Index: 7
Last.Ariel D. Anbar (ASU: Arizona State University)H-Index: 57
view all 8 authors...
Abstract Recent work has demonstrated that titanium (Ti) isotopes undergo mass-dependent isotope fractionation during magmatic differentiation, leaving evolved silicic melts preferentially enriched in heavy Ti isotopes. Preferential incorporation of light Ti isotopes in crystallizing Fe-Ti oxides is thought to be the mechanism responsible for this fractionation in magmatic rocks. To test this hypothesis, we present Ti isotope measurements of Fe-Ti oxide mineral separates of Kilauea Iki lava lake...
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#1Geoffrey J. Gilleaudeau (ASU: Arizona State University)H-Index: 7
#2Stephen J. Romaniello (ASU: Arizona State University)H-Index: 16
Last.Ariel D. Anbar (ASU: Arizona State University)H-Index: 57
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Abstract Reconstructing Earth's oxygenation history is key to deciphering environmental controls on early biospheric evolution. During the mid-Proterozoic Eon, low (but potentially variable) atmospheric pO2 led to highly heterogeneous marine redox conditions, with most studies indicating a relatively shallow depth of oxygen penetration. The relative proportion of oxic, anoxic and iron-rich (ferruginous), and anoxic and sulfide-rich (euxinic) conditions on the global seafloor is difficult to quan...
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#1Chadlin M. Ostrander (ASU: Arizona State University)H-Index: 3
#2Swapan K. Sahoo (UNLV: University of Nevada, Las Vegas)H-Index: 4
Last.Ariel D. Anbar (ASU: Arizona State University)H-Index: 57
view all 11 authors...
Abstract The Ediacaran Doushantuo Formation offers one of the most complete and extensively studied records of end-Neoproterozoic biotic and environmental change. Here, we report multiple coeval negative molybdenum (Mo) isotope excursions (to as low as δ98MoNIST+0.25 = −2.24 ± 0.10‰; 2SD) in shales from four separate sites in South China (Rongxi, Taoying, Wuhe, and Yuanjia) that preserve the Doushantuo Formation. The negative δ98Mo excursions appear coincident with previously discovered and seem...
1 CitationsSource
#1Ngoc Truong (Cornell University)
#2Adam A. Monroe (ASU: Arizona State University)H-Index: 3
Last.Jonathan I. Lunine (Cornell University)H-Index: 82
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Abstract To test the potential of using amino acid abundances as a biosignature at icy ocean worlds, we investigate whether primordial amino acids (accreted or formed by early aqueous processes) could persist until the present time. By examining the decomposition kinetics of amino acids in aqueous solution based on existing laboratory rate data, we find that all fourteen proteinogenic amino acids considered in this study decompose to a very large extent (>99.9%) over relatively short lengths of ...
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#1Feifei Zhang (Yale University)H-Index: 7
#2Thomas J. Algeo (UC: University of Cincinnati)H-Index: 31
Last.Ariel D. Anbar (ASU: Arizona State University)H-Index: 57
view all 8 authors...
Abstract The Smithian-Spathian boundary (SSB) was an interval characterized by a major global carbon cycle perturbation, climatic cooling from a middle/late Smithian boundary hyperthermal condition, and a major setback in the recovery of marine necto-pelagic faunas from the end-Permian mass extinction. Although the SSB has been linked to changes in oceanic redox conditions, key aspects of this redox variation (e.g., duration, extent, and triggering mechanisms) and its relationship to coeval clim...
5 CitationsSource
#1Chris Mead (ASU: Arizona State University)H-Index: 5
#2Sanlyn Buxner (UA: University of Arizona)H-Index: 7
Last.Ariel D. Anbar (ASU: Arizona State University)H-Index: 57
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AbstractField learning is considered an essential part of geoscience education, yet there are many practical challenges that limit broad and equitable access to field learning. Virtual field experi...
2 CitationsSource
#1Robert W. Nicklas (UMD: University of Maryland, College Park)H-Index: 4
#2Igor S. Puchtel (UMD: University of Maryland, College Park)H-Index: 37
Last.Ariel D. Anbar (ASU: Arizona State University)H-Index: 57
view all 9 authors...
Abstract The oxygen fugacities of nine mantle-derived komatiitic and picritic systems ranging in age from 3.55 Ga to modern day were determined using the redox-sensitive partitioning of V between liquidus olivine and komatiitic/picritic melt. The combined set of the oxygen fugacity data for seven systems from this study and the six komatiite systems studied by Nicklas et al. (2018), all of which likely represent large regions of the mantle, defines a well-constrained trend indicating an increase...
5 CitationsSource
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