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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.


  
Seismic Evidence for Plume-Slab Interaction by High-Resolution Imaging of the 410-km Discontinuity Under Tonga 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2019, 46 (23) : 13687-13694
作者:  Li, Luchen;  Chen, Yi-Wei;  Zheng, Yingcai;  Hu, Hao;  Wu, Jonny
收藏  |  浏览/下载：11/0  |  提交时间：2020/02/17
mantle plume  Samoa  Tonga  plume-slab interaction  discontinuity  
Plume-Induced Breakup of a Subducting Plate: Microcontinent Formation Without Cessation of the Subduction Process 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2019, 46 (7) : 3663-3675
作者:  Koptev, Alexander;  Beniest, Anouk;  Gerya, Taras;  Ehlers, Todd A.;  Jolivet, Laurent;  Leroy, Sylvie
收藏  |  浏览/下载：4/0  |  提交时间：2019/11/26
microcontinent  subduction  mantle plume  Neo-Tethys  3-D thermo-mechanical modeling  
Recycled ancient ghost carbonate in the Pitcairn mantle plume 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2018, 115 (35) : 8682-8687
作者:  Wang, Xiao-Jun;  Chen, Li-Hui;  Hofmann, Albrecht W.;  Hanyu, Takeshi;  Kawabata, Hiroshi;  Zhong, Yuan;  Xie, Lie-Wen;  Shi, Jin-Hua;  Miyazaki, Takashi;  Hirahara, Yuka;  Takahashi, Toshiro;  Senda, Ryoko;  Chang, Qing;  Vaglarov, Bogdan S.;  Kimura, Jun-Ichi
收藏  |  浏览/下载：11/0  |  提交时间：2019/11/27
Pitcairn mantle plume  EM1  magnesium isotopes  ancient carbonate-bearing sediments  
Chemical trends in ocean islands explained by plume-slab interaction 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2018, 115 (17) : 4351-4356
作者:  Dannberg, Juliane;  Gassmoller, Rene
收藏  |  浏览/下载：5/0  |  提交时间：2019/11/27
mantle plumes  hotspots  bilateral zoning  geodynamic modeling  plume generation zones  
Variable Melt Production Rate of the Kerguelen HotSpot Due To Long-Term Plume-Ridge Interaction 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2018, 45 (1) : 126-136
作者:  Bredow, Eva;  Steinberger, Bernhard
收藏  |  浏览/下载：4/0  |  提交时间：2019/04/09
plume-ridge interaction  Kerguelen mantle plume  melt production rate  hot spot track  geodynamic model  Indian Ocean  
Receiver Function Imaging of Mantle Transition Zone Discontinuities Beneath the Tanzania Craton and Adjacent Segments of the East African Rift System 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2017, 44 (24)
作者:  Sun, Muchen;  Liu, Kelly H.;  Fu, Xiaofei;  Gao, Stephen S.
收藏  |  浏览/下载：10/0  |  提交时间：2019/04/09
East African Rift System  mantle transition zone  mantle plume  receiver function  continental rifting