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Displaced cratonic mantle concentrates deep carbon during continental rifting

机译：流离失所的克拉特队的裂缝队在大陆河流中浓缩深碳

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Abstract Continental rifts are important sources of mantle carbon dioxide (CO2) emission into Earth’s atmosphere1–3. Because deep carbon is stored for long periods in the lithospheric mantle4–6, rift CO2 flux depends on lithospheric processes that control melt and volatile transport1,3,7. The influence of compositional and thickness differences between Archaean and Proterozoic lithosphere on deep-carbon fluxes remains untested. Here we propose that displacement of carbon-enriched Tanzanian cratonic mantle concentrates deep carbon below parts of the East African Rift System. Sources and fluxes of CO2 and helium are examined over a 350-kilometre-long transect crossing the boundary between orogenic (Natron and Magadi basins) and cratonic (Balangida and Manyara basins) lithosphere from north to south. Areas of diffuse CO2 degassing exhibit increasing mantle CO2 flux and 3He/4He ratios as the rift transitions from Archaean (cratonic) to Proterozoic (orogenic) lithosphere. Active carbonatite magmatism also occurs near the craton edge. These data indicate that advection of the root of thick Archaean lithosphere laterally to the base of the much thinner adjacent Proterozoic lithosphere creates a zone of highly concentrated deep carbon. This mode of deep-carbon extraction may increase CO2 fluxes in some continental rifts, helping to control the production and location of carbonate-rich magmas.
机译：摘要大陆裂缝是地球大气层的披风二氧化碳（CO2）发射的重要来源1-3。由于深碳在岩石型岩石罩4-6中长时间储存​​，所以裂缝CO2通量取决于控制熔体和挥发性的岩石术方法1.3,7。面向碳和正型岩岩岩石圈对深碳通量之间的组成和厚度差异的影响仍未存在。在这里，我们提出了碳富含碳坦桑尼亚克拉特罗地幔的流离失所，将深度碳的低于东非裂缝系统的部分。 CO2和氦气的来源和助焊剂在350公里长的横跨朝南到朝南的山脉（Netron和Magadi盆地）和裂缝（BALANGIDA和MOTEARA BATINS）岩石之间的界限进行了350公里的横断面。弥散CO 2的区域脱气表现出增加的地幔CO2通量和3HE / 4HE比率作为来自古代（克拉顿）到正常古代（Orenthic）岩石圈的裂缝转变。活性碳酸盐岩魔法师也发生在Craton Edge附近。这些数据表明，厚古岩层的根源横向于相邻的正相色岩岩岩层的底部的基础产生了高度浓缩的深碳区。这种深碳萃取模式可能会增加一些大陆裂缝中的CO 2势次，有助于控制富含碳酸盐的岩浆的生产和位置。

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  • 来源
    《Nature》 |2020年第7810期|67-72|共6页
  • 作者

    James D. Muirhead; Tobias P. Fischer; Sarah J. Oliva; Amani Laizer; Jolante van Wijk; Claire A. Currie; Hyunwoo Lee; Emily J. Judd; Emmanuel Kazimoto; Yuji Sano; Naoto Takahata; Christel Tiberi; Stephen F. Foley; Josef Dufek; Miriam C. Reiss; Cynthia J. E;

  • 作者单位

    Department of Earth Sciences Syracuse University Syracuse NY USA;

    Department of Earth and Planetary Sciences University of New Mexico Albuquerque NM USA;

    Department of Earth and Environmental Sciences Tulane University New Orleans LA USA;

    Department of Geology University of Dar es Salaam Dar es Salaam Tanzania;

    New Mexico Institute of Mining and Technology Socorro NM USA;

    Department of Physics University of Alberta Edmonton Alberta Canada;

    School of Earth and Environmental Sciences Seoul National University Seoul South Korea;

    Department of Earth Sciences Syracuse University Syracuse NY USA;

    Department of Geology University of Dar es Salaam Dar es Salaam Tanzania;

    Atmosphere and Ocean Research Institute University of Tokyo Chiba Japan;

    Atmosphere and Ocean Research Institute University of Tokyo Chiba Japan;

    Géosciences Montpellier CNRS Université de Montpellier Montpellier France;

    Department of Earth and Environmental Sciences Macquarie University North Ryde New South Wales Australia;

    Department of Earth Sciences University of Oregon Eugene OR USA;

    Institute of Geosciences Goethe University Frankfurt Frankfurt am Main Germany;

    Department of Earth and Environmental Sciences Tulane University New Orleans LA USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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