globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1422887112
论文题名:
Revealing the climate of snowball Earth from δ17O systematics of hydrothermal rocks
作者: Herwartz D.; Pack A.; Krylov D.; Xiao Y.; Muehlenbachs K.; Sengupta S.; Di Rocco T.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2015
卷: 112, 期:17
起始页码: 5337
结束页码: 5341
语种: 英语
英文关键词: Climate ; Hydrothermal alteration ; Paleo-temperatures ; Snowball Earth ; Triple oxygen isotopes
Scopus关键词: chemical compound ; oxygen ; oxygen 17 ; water ; Antarctica ; Article ; astronomy ; climate ; distillation ; fractionation ; glacier ; hydrology ; isotope analysis ; latitude ; measurement ; Neoproterozoic ; Paleoproterozoic ; polymerization ; Precambrian ; priority journal ; Proterozoic ; rock ; taxonomy ; temperature ; water sampling
英文摘要: The oxygen isotopic composition of hydrothermally altered rocks partly originates from the interacting fluid. We use the triple oxygen isotope composition (17O/16O, 18O/16O) of Proterozoic rocks to reconstruct the 18O/16O ratio of ancient meteoric waters. Some of these waters have originated from snowball Earth glaciers and thus give insight into the climate and hydrology of these critical intervals in Earth history. For a Paleoproterozoic [∼2.3-2.4 gigayears ago (Ga)] snowball Earth, δ18O = -43 ± 3‰ is estimated for pristine meteoric waters that precipitated at low paleo-latitudes (≤35°N). Today, such low 18O/16O values are only observed in central Antarctica, where long distillation trajectories in combination with low condensation temperatures promote extreme 18O depletion. For a Neoproterozoic (∼0.6-0.7 Ga) snowball Earth, higher meltwater δ18O estimates of -21 ± 3‰ imply less extreme climate conditions at similar paleolatitudes (≤35°N). Both estimates are single snapshots of ancient water samples and may not represent peak snowball Earth conditions. We demonstrate how 17O/16O measurements provide information beyond traditional 18O/16O measurements, even though all fractionation processes are purely mass dependent. © 2015, National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162359
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作者单位: Herwartz, D., Abteilung Isotopengeologie, Geowissenschaftliches Zentrum, Georg-August-Universität Göttingen, Göttingen, 37073, Germany, Institut für Geologie und Mineralogie, Universität zu Köln, Cologne, 50674, Germany; Pack, A., Abteilung Isotopengeologie, Geowissenschaftliches Zentrum, Georg-August-Universität Göttingen, Göttingen, 37073, Germany; Krylov, D., Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, St. Petersburg, 199034, Russian Federation; Xiao, Y., CAS Key Laboratory of Crustal-Mantle Materials and Environments, School of Earth and Space Science, University of Science and Technology of China, Hefei, 230026, China; Muehlenbachs, K., Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada; Sengupta, S., Abteilung Isotopengeologie, Geowissenschaftliches Zentrum, Georg-August-Universität Göttingen, Göttingen, 37073, Germany; Di Rocco, T., Abteilung Isotopengeologie, Geowissenschaftliches Zentrum, Georg-August-Universität Göttingen, Göttingen, 37073, Germany

Recommended Citation:
Herwartz D.,Pack A.,Krylov D.,et al. Revealing the climate of snowball Earth from δ17O systematics of hydrothermal rocks[J]. Proceedings of the National Academy of Sciences of the United States of America,2015-01-01,112(17)
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