Search Results - "Eiler, John M"

Paleoclimate reconstruction using carbonate clumped isotope thermometry by Eiler, John M.

“…Carbonate clumped isotope thermometry is a relatively new paleotemperature proxy based on measurements of the degree of ordering of 13C and 18O into bonds with…”
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The Isotopic Anatomies of Molecules and Minerals by Eiler, John M

“…Most natural compounds are composed of diverse isotopologues that differ in the number and/or symmetrically unique atomic locations of isotopic substitutions…”
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Magnitude and Duration of Late Ordovician-Early Silurian Glaciation by Finnegan, Seth, Bergmann, Kristin, Eiler, John M, Jones, David S, Fike, David A, Eisenman, Ian, Hughes, Nigel C, Tripati, Aradhna K, Fischer, Woodward W

“…Understanding ancient climate changes is hampered by the inability to disentangle trends in ocean temperature from trends in continental ice volume. We used…”
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High-temperature environments of human evolution in East Africa based on bond ordering in paleosol carbonates by Passey, Benjamin H., Levin, Naomi E., Cerling, Thure E., Brown, Francis H., Eiler, John M., Turekian, Karl K.

“…Many important hominid-bearing fossil localities in East Africa are in regions that are extremely hot and dry. Although humans are well adapted to such…”
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Direct measurement of hydroxyl in the lunar regolith and the origin of lunar surface water by Liu, Yang, Guan, Yunbin, Zhang, Youxue, Rossman, George R., Eiler, John M., Taylor, Lawrence A.

“…Over the past few years, it has become clear that the Moon’s surface is not entirely dry. The direct identification of hydroxyl in glasses produced in lunar…”
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Carbonates in the Martian meteorite Allan Hills 84001 formed at 18 ± 4 °C in a near-surface aqueous environment by Halevy, Itay, Fischer, Woodward W, Eiler, John M

“…Despite evidence for liquid water at the surface of Mars during the Noachian epoch, the temperature of early aqueous environments has been impossible to…”
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A hydrothermal origin for isotopically anomalous cap dolostone cements from south China by Bristow, Thomas F., Bonifacie, Magali, Derkowski, Arkadiusz, Eiler, John M., Grotzinger, John P.

“…No way out for snowball Earth Earth's emergence from perhaps its most severe ice age, the Marinoan 'snowball' glaciation around 635 million years ago, is…”
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Coupling of surface temperatures and atmospheric CO2 concentrations during the Palaeozoic era by CAME, Rosemarie E, EILER, John M, VEIZER, Jan, AZMY, Karem, BRAND, Uwe, WEIDMAN, Christopher R

“…Atmospheric carbon dioxide concentrations seem to have been several times modern levels during much of the Palaeozoic era (543-248 million years ago), but…”
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Measurement of rare isotopologues of nitrous oxide by high-resolution multi-collector mass spectrometry by Magyar, Paul M., Orphan, Victoria J., Eiler, John M.

“…Rationale Bulk and position‐specific stable isotope characterization of nitrous oxide represents one of the most powerful tools for identifying its…”
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Stable Isotope Analysis of Intact Oxyanions Using Electrospray Quadrupole-Orbitrap Mass Spectrometry by Neubauer, Cajetan, Crémière, Antoine, Wang, Xingchen T, Thiagarajan, Nivedita, Sessions, Alex L, Adkins, Jess F, Dalleska, Nathan F, Turchyn, Alexandra V, Clegg, Josephine A, Moradian, Annie, Sweredoski, Michael J, Garbis, Spiros D, Eiler, John M

“…The stable isotopes of sulfate, nitrate, and phosphate are frequently used to study geobiological processes of the atmosphere, ocean, as well as land…”
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Sulfur isotopes of organic matter preserved in 3.45-billion-year-old stromatolites reveal microbial metabolism by Bontognali, Tomaso R. R, Sessions, Alex L, Allwood, Abigail C, Fischer, Woodward W, Grotzinger, John P, Summons, Roger E, Eiler, John M

“…The 3.45-billion-year-old Strelley Pool Formation of Western Australia preserves stromatolites that are considered among the oldest evidence for life on Earth…”
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Isotopic evidence of acetate turnover in Precambrian continental fracture fluids by Mueller, Elliott P., Panehal, Juliann, Meshoulam, Alexander, Song, Min, Hansen, Christian T., Warr, Oliver, Boettger, Jason, Heuer, Verena B., Bach, Wolfgang, Hinrichs, Kai-Uwe, Eiler, John M., Orphan, Victoria, Lollar, Barbara Sherwood, Sessions, Alex L.

“…The deep continental crust represents a vast potential habitat for microbial life where its activity remains poorly constrained. Organic acids like acetate are…”
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Dinosaur Body Temperatures Determined from Isotopic ( 13 C- 18 O) Ordering in Fossil Biominerals by Eagle, Robert A., Tütken, Thomas, Martin, Taylor S., Tripati, Aradhna K., Fricke, Henry C., Connely, Melissa, Cifelli, Richard L., Eiler, John M.

“…The nature of the physiology and thermal regulation of the nonavian dinosaurs is the subject of debate. Previously, arguments have been made for both…”
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SQUID–SIMS is a useful approach to uncover primary signals in the Archean sulfur cycle by Fischer, Woodward W., Fike, David A., Johnson, Jena E., Raub, Timothy D., Guan, Yunbin, Kirschvink, Joseph L., Eiler, John M.

“…Many aspects of Earth’s early sulfur cycle, from the origin of mass-anomalous fractionations to the degree of biological participation, remain poorly…”
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Isotopic ordering in eggshells reflects body temperatures and suggests differing thermophysiology in two Cretaceous dinosaurs by Eagle, Robert A., Enriquez, Marcus, Grellet-Tinner, Gerald, Pérez-Huerta, Alberto, Hu, David, Tütken, Thomas, Montanari, Shaena, Loyd, Sean J., Ramirez, Pedro, Tripati, Aradhna K., Kohn, Matthew J., Cerling, Thure E., Chiappe, Luis M., Eiler, John M.

“…Our understanding of the evolutionary transitions leading to the modern endothermic state of birds and mammals is incomplete, partly because tools available to…”
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Evidence for the extraterrestrial origin of a natural quasicrystal by Bindi, Luca, Eiler, John M., Guan, Yunbin, Hollister, Lincoln S., MacPherson, Glenn, Steinhardt, Paul J., Yao, Nan

“…We present evidence that a rock sample found in the Koryak Mountains in Russia and containing icosahedrite, an icosahedral quasicrystatline phase with…”
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PAHs, Hydrocarbons, and Dimethylsulfides in Asteroid Ryugu Samples A0106 and C0107 and the Orgueil (CI1) Meteorite by Aponte, Jose C., Dworkin, Jason P., Glavin, Daniel P., Elsila, Jamie E., Parker, Eric T., Mclain, Hannah L., Naraoka, Hiroshi, Okazaki, Ryuji, Takano, Yoshinori, Tachibana, Shogo, Yada, Toru, Miyazaki, Akiko, Yogata, Kasumi, Abe, Masanao, Okada, Tatsuaki, Usui, Tomohiro, Yoshikawa, Makoto, Saiki, Takanao, Tanaka, Satoshi, Nakazawa, Satoru, Tsuda, Yuichi, Watanabe, Sei-ichiro

“…Evaluating the molecular distribution of organic compounds in pristine extraterrestrial materials is cornerstone to understanding the abiotic synthesis of…”
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High regional climate sensitivity over continental China constrained by glacial-recent changes in temperature and the hydrological cycle by Eagle, Robert A., Risi, Camille, Mitchell, Jonathan L., Eiler, John M., Seibt, Ulrike, Neelin, J. David, Li, Gaojun, Tripati, Aradhna K.

“…The East Asian monsoon is one of Earth’s most significant climatic phenomena, and numerous paleoclimate archives have revealed that it exhibits variations on…”
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Chemical fractionation in the silicate vapor atmosphere of the Earth by Pahlevan, Kaveh, Stevenson, David J., Eiler, John M.

“…Despite its importance to questions of lunar origin, the chemical composition of the Moon is not precisely known. In recent years, however, the isotopic…”
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Evidence in Tissint for recent subsurface water on Mars by Chen, Yang, Liu, Yang, Guan, Yunbin, Eiler, John M., Ma, Chi, Rossman, George R., Taylor, Lawrence A.

“…We report unambiguous chemical evidence for subsurface water activity in the martian crust at <600 Ma based on the data from Tissint, a fresh martian meteorite…”
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