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The thousand and one facets of glass 新闻
来源平台：CNRS News. 发布日期：2022
作者:  admin
收藏  |  浏览/下载：18/0  |  提交时间：2022/03/16
Exploring the world’s largest ocean current 新闻
来源平台：CNRS News. 发布日期：2021
作者:  admin
收藏  |  浏览/下载：12/0  |  提交时间：2021/01/28
A seawater throttle on H-2 production in Precambrian serpentinizing systems 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (26) : 14756-14763
作者:  Tutolo, Benjamin M.;  Seyfried, William E., Jr.;  Tosca, Nicholas J.
收藏  |  浏览/下载：9/0  |  提交时间：2020/06/22
serpentinization  Precambrian  atmosphere redox state  origins of life  
The Nd-142/Nd-144 variations in mantle-derived rocks provide constraints on the stirring rate of the mantle from the Hadean to the present 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (26) : 14738-14744
作者:  Hyung, Eugenia;  Jacobsen, Stein B.
收藏  |  浏览/下载：5/0  |  提交时间：2020/06/22
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  
Abiotic hydrogen (H-2) sources and sinks near the Mid-Ocean Ridge (MOR) with implications for the subseafloor biosphere 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (24) : 13283-13293
作者:  Worman, Stacey L.;  Pratson, Lincoln F.;  Karson, Jeffrey A.;  Schlesinger, William H.
收藏  |  浏览/下载：12/0  |  提交时间：2020/06/09
biogeochemistry  origins of life  hydrogen  Mid-Ocean Ridge  microbes  
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.


  
Microbes in underground aquifers beneath deep-sea Mid-Atlantic Ridge 'chow down' on carbon 新闻
来源平台：US National Scientific Foundation (NSF). 发布日期：2018
作者:  admin
收藏  |  浏览/下载：0/0  |  提交时间：2019/04/17
Microbes in underground aquifers beneath deep-sea Mid-Atlantic Ridge 'chow down' on carbon 新闻
来源平台：US National Scientific Foundation (NSF). 发布日期：2018
作者:  admin
收藏  |  浏览/下载：0/0  |  提交时间：2019/04/17
Microbes in underground aquifers beneath deep-sea Mid-Atlantic Ridge 'chow down' on carbon 新闻
来源平台：US National Scientific Foundation (NSF). 发布日期：2018
作者:  admin
收藏  |  浏览/下载：0/0  |  提交时间：2019/04/17