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新研究揭示大西洋加宽的地质机理 快报文章
地球科学快报，2021年第3期
作者:  王晓晨
Microsoft Word(14Kb)  |  收藏  |  浏览/下载：405/0  |  提交时间：2021/02/09
Plate  Mid-ocean ridge  the earth's mantle  
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：10/0  |  提交时间：2020/06/09
biogeochemistry  origins of life  hydrogen  Mid-Ocean Ridge  microbes  
Time-Dependent Crustal Accretion on the Southeast Indian Ridge Revealed by Malaysia Airlines Flight MH370 Search 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (12)
作者:  Parnell-Turner, Ross;  Sim, Shi J.;  Olive, Jean-Arthur
收藏  |  浏览/下载：7/0  |  提交时间：2020/05/13
mid-ocean ridge  faulting  volcanism  abyssal hills  MH370  
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.


  
Melting at the Edge of a Slab in the Deepest Mantle 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2019, 46 (14) : 8000-8008
作者:  Thorne, Michael S.;  Takeuchi, Nozomu;  Shiomi, Katsuhiko
收藏  |  浏览/下载：7/0  |  提交时间：2019/11/27
ultralow-velocity zone  mid-ocean ridge basalt  subduction  core-mantle boundary  
Prefrontal bore mixing 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2017, 44 (18)
作者:  van Haren, Hans;  Duineveld, Gerard;  de Stigter, Henko
收藏  |  浏览/下载：4/0  |  提交时间：2019/04/09
deep-ocean internal wave breaking  pronounced interior mixing preceding nonlinear bottom front  400m high-resolution temperature sensor mooring  Mid-Atlantic Ridge  Rainbow hydrothermal vent system  
Noble gas signatures in the Island of Maui, Hawaii: Characterizing groundwater sources in fractured systems 期刊论文
WATER RESOURCES RESEARCH, 2017, 53 (5)
作者:  Niu, Yi;  Castro, M. Clara;  Hall, Chris M.;  Gingerich, Stephen B.;  Scholl, Martha A.;  Warrier, Rohit B.
收藏  |  浏览/下载：11/0  |  提交时间：2019/04/09
Maui Hawaii  noble gases  noble gas temperatures  basal aquifer  springs  mid-ocean ridge basalt