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How are oceans born? 新闻
来源平台：CNRS News. 发布日期：2021
作者:  admin
收藏  |  浏览/下载：4/0  |  提交时间：2021/11/15
Early humans escaped worst impacts of massive volcanic eruption  新闻
来源平台：National Center of Atmospheric Research. 发布日期：2021
作者:  admin
收藏  |  浏览/下载：10/0  |  提交时间：2021/07/26
NASA-NOAA's Suomi NPP satellite analyzes Saharan dust aerosol blanket 新闻
来源平台：EurekAlert. 发布日期：2020
作者:  admin
收藏  |  浏览/下载：1/0  |  提交时间：2020/06/28
Identification of chondritic krypton and xenon in Yellowstone gases and the timing of terrestrial volatile accretion 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (25) : 13997-14004
作者:  Broadley, Michael W.;  Barry, Peter H.;  Bekaert, David V.;  Byrne, David J.;  Caracausi, Antonio;  Ballentine, Christopher J.;  Marty, Bernard
收藏  |  浏览/下载：9/0  |  提交时间：2020/06/16
origin of Earth'  s volatiles  accretion  mantle plume  noble gases  Yellowstone  
Hydrothermal (NN)-N-15-N-15 abundances constrain the origins of mantle nitrogen 期刊论文
NATURE, 2020, 580 (7803) : 367-+
作者:  Zhao, Steven;  Jang, Cholsoon;  Liu, Joyce;  Uehara, Kahealani;  Gilbert, Michael;  Izzo, Luke;  Zeng, Xianfeng;  Trefely, Sophie;  Fernandez, Sully;  Carrer, Alessandro;  Miller, Katelyn D.;  Schug, Zachary T.;  Snyder, Nathaniel W.;  Gade, Terence P.;  Titchenell, Paul M.;  Rabinowitz, Joshua D.;  Wellen, Kathryn E.
收藏  |  浏览/下载：14/0  |  提交时间：2020/05/13

Nitrogen is the main constituent of the Earth'  s atmosphere, but its provenance in the Earth'  s mantle remains uncertain. The relative contribution of primordial nitrogen inherited during the Earth'  s accretion versus that subducted from the Earth'  s surface is unclear(1-6). Here we show that the mantle may have retained remnants of such primordial nitrogen. We use the rare (NN)-N-15-N-15 isotopologue of N-2 as a new tracer of air contamination in volcanic gas effusions. By constraining air contamination in gases from Iceland, Eifel (Germany) and Yellowstone (USA), we derive estimates of mantle delta N-15 (the fractional difference in N-15/N-14 from air), N-2/Ar-36 and N-2/He-3. Our results show that negative delta N-15 values observed in gases, previously regarded as indicating a mantle origin for nitrogen(7-10), in fact represent dominantly air-derived N-2 that experienced N-15/N-14 fractionation in hydrothermal systems. Using two-component mixing models to correct for this effect, the (NN)-N-15-N-15 data allow extrapolations that characterize mantle endmember delta N-15, N-2/Ar-36 and N-2/He-3 values. We show that the Eifel region has slightly increased delta N-15 and N-2/Ar-36 values relative to estimates for the convective mantle provided by mid-ocean-ridge basalts(11), consistent with subducted nitrogen being added to the mantle source. In contrast, we find that whereas the Yellowstone plume has delta N-15 values substantially greater than that of the convective mantle, resembling surface components(12-15), its N-2/Ar-36 and N-2/He-3 ratios are indistinguishable from those of the convective mantle. This observation raises the possibility that the plume hosts a primordial component. We provide a test of the subduction hypothesis with a two-box model, describing the evolution of mantle and surface nitrogen through geological time. We show that the effect of subduction on the deep nitrogen cycle may be less important than has been suggested by previous investigations. We propose instead that high mid-ocean-ridge basalt and plume delta N-15 values may both be dominantly primordial features.


  
Redox variations in Mauna Kea lavas, the oxygen fugacity of the Hawaiian plume, and the role of volcanic gases in Earth's oxygenation 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2017, 114 (34) : 8997-9002
作者:  Brounce, Maryjo;  Stolper, Edward;  Eiler, John
收藏  |  浏览/下载：5/0  |  提交时间：2019/11/27
ocean island basalts  oxygen fugacity  Hawaii volcanism  volcanic degassing  Great Oxidation Event  
Volcanic tremor and plume height hysteresis from Pavlof Volcano, Alaska (vol 355, aam7405, 2017) 期刊论文
SCIENCE, 2017, 355 (6329)
作者:  Fee, D.
收藏  |  浏览/下载：0/0  |  提交时间：2019/11/27
Primordial helium entrained by the hottest mantle plumes 期刊论文
NATURE, 2017, 542 (7641) : 340-+
作者:  Jackson, M. G.;  Konter, J. G.;  Becker, T. W.
收藏  |  浏览/下载：1/0  |  提交时间：2019/04/09
Erratum for the Report “Volcanic tremor and plume height hysteresis from Pavlof Volcano, Alaska” by D. Fee, M. M. Haney, R. S. Matoza, A. R. Van Eaton, P. Cervelli, D. J. Schneider, A. M. Iezzi 期刊论文
Science, 2017, 355 (6322)
作者:  [unavailable]
收藏  |  浏览/下载：0/0  |  提交时间：2020/04/17
Volcanic tremor and plume height hysteresis from Pavlof Volcano, Alaska 期刊论文
SCIENCE, 2017, 355 (6320) : 45-48
作者:  Fee, David;  Haney, Matthew M.;  Matoza, Robin S.;  Van Eaton, Alexa R.;  Cervelli, Peter;  Schneider, David J.;  Iezzi, Alexandra M.
收藏  |  浏览/下载：6/0  |  提交时间：2019/11/27