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Ariel D. Anbar
Arizona State University
368Publications
56H-index
11kCitations
Publications 368
Newest
Published on Sep 1, 2019in Earth and Planetary Science Letters 4.64
Geoffrey J. Gilleaudeau6
Estimated H-index: 6
(ASU: Arizona State University),
Stephen J. Romaniello13
Estimated H-index: 13
(ASU: Arizona State University)
+ 9 AuthorsWang Zheng7
Estimated H-index: 7
(ASU: Arizona State University)
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 p O 2 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 qu...
Published on Jul 1, 2019in Geochimica et Cosmochimica Acta 4.26
Chadlin M. Ostrander2
Estimated H-index: 2
(ASU: Arizona State University),
Swapan K. Sahoo3
Estimated H-index: 3
(UNLV: University of Nevada, Las Vegas)
+ 8 AuthorsStephen J. Romaniello13
Estimated H-index: 13
(ASU: Arizona State University)
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 δ 98 Mo NIST+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 δ 98 Mo excursions appear coincident with previously discovered and...
Published on Sep 1, 2019in Icarus 3.56
Ngoc Truong (Cornell University), Adam A. Monroe3
Estimated H-index: 3
(ASU: Arizona State University)
+ 2 AuthorsJonathan I. Lunine78
Estimated H-index: 78
(Cornell University)
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 ...
Published on Oct 1, 2018in Earth-Science Reviews 9.53
Feifei Zhang1
Estimated H-index: 1
(Yale University),
Thomas J. Algeo28
Estimated H-index: 28
(UC: University of Cincinnati)
+ 5 AuthorsAriel D. Anbar56
Estimated H-index: 56
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...
Published in Geobiology 4.10
Feifei Zhang6
Estimated H-index: 6
,
Shuhai Xiao51
Estimated H-index: 51
(VT: Virginia Tech)
+ -3 AuthorsTimothy M. Lenton53
Estimated H-index: 53
(University of Exeter)
Published on Apr 3, 2019in Journal of geoscience education
Chris Mead4
Estimated H-index: 4
(ASU: Arizona State University),
Sanlyn Buxner6
Estimated H-index: 6
(UA: University of Arizona)
+ 3 AuthorsAriel D. Anbar56
Estimated H-index: 56
(ASU: Arizona State University)
Published on Apr 1, 2019in Geochimica et Cosmochimica Acta 4.26
Robert W. Nicklas3
Estimated H-index: 3
(UMD: University of Maryland, College Park),
Igor S. Puchtel35
Estimated H-index: 35
(UMD: University of Maryland, College Park)
+ 6 AuthorsAriel D. Anbar56
Estimated H-index: 56
(ASU: Arizona State University)
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...
Published on Apr 1, 2019in Nature Geoscience 14.48
Chadlin M. Ostrander2
Estimated H-index: 2
(ASU: Arizona State University),
Sune G. Nielsen23
Estimated H-index: 23
(WHOI: Woods Hole Oceanographic Institution)
+ 4 AuthorsAriel D. Anbar56
Estimated H-index: 56
(ASU: Arizona State University)
Published on Mar 1, 2019in Geochimica et Cosmochimica Acta 4.26
Aleisha C. Johnson1
Estimated H-index: 1
(ASU: Arizona State University),
Stephen J. Romaniello13
Estimated H-index: 13
(ASU: Arizona State University)
+ 6 AuthorsAriel D. Anbar56
Estimated H-index: 56
Abstract Constraining the rate at which sulfide minerals undergo oxidative weathering at low atmospheric O 2 is crucial for understanding the evolution of the Archean and Proterozoic biosphere when O 2 was a trace atmospheric gas. However, recent studies attempting to constrain sulfide oxidation rates, atmospheric O 2 sinks, and trace metal delivery to seawater under Archean conditions are limited by the need to extrapolate from experimental pyrite oxidation kinetics determined at much higher O ...
Published on Mar 1, 2019in Geochimica et Cosmochimica Acta 4.26
Dmitri A. Ionov44
Estimated H-index: 44
(CAS: Chinese Academy of Sciences),
Yu Han Qi1
Estimated H-index: 1
(USTC: University of Science and Technology of China)
+ 6 AuthorsFang Huang23
Estimated H-index: 23
(USTC: University of Science and Technology of China)
Abstract Ca isotopes can be strongly fractionated at the Earth’s surface and thus may be tracers of subducted carbonates and other Ca-rich surface materials in mantle rocks, magmas and fluids. However, the δ 44/40 Ca range in the mantle and the scope of intra-mantle isotope fractionation are poorly constrained. We report Ca isotope analyses for 22 mantle xenoliths: four basalt-hosted refractory peridotites from Tariat in Mongolia and 18 samples from the Obnazhennaya (Obn) kimberlite on the NE Si...
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