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DOI | 10.1073/pnas.1609228114 |
K isotopes as a tracer of seafloor hydrothermal alteration | |
Parendo, Christopher A.1; Jacobsen, Stein B.1; Wang, Kun1,2,3 | |
2017-02-21 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
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ISSN | 0027-8424 |
出版年 | 2017 |
卷号 | 114期号:8页码:1827-1831 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | At ocean spreading ridges, circulation of seawater through rock at elevated temperatures alters the chemical and isotopic composition of oceanic crust. Samples obtained from drilling into ocean floor and from ophiolites have demonstrated that certain isotope systems, such as O-18/O-16 and Sr-87/Sr-86, are systematically modified in hydrothermally altered oceanic crust. Although K is known to be mobile during hydrothermal alteration, there have not yet been any K-isotope analyses of altered oceanic crustal materials. Moreover, the K-41/K-39 of seawater was recently found to be significantly higher than that of igneous rocks, so the addition of seawater K to oceanic crust would be expected to generate K-41/K-39 variations in affected rocks. Here, we report high-precision K-41/K-39 measurements for samples from the Bay of Islands ophiolite, and we document large variations in K-41/K-39, covarying with previous determinations of Sr-87/Sr-86. Our data indicate that analytically resolvable K-41/K-39 effects arise in oceanic crust as a result of hydrothermal alteration. This finding raises the possibility that K-41/K-39 can be used as an effective tracer of oceanic crust recycled into the mantle, as a diagnostic criterion by which to identify ancient fragments of oceanic crust, and as a constraint on the flux of K between oceanic crust and seawater. |
英文关键词 | potassium isotopes hydrothermal alteration ocean crust ophiolite |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000395099500052 |
WOS关键词 | ISLANDS OPHIOLITE COMPLEX ; ALTERED OCEANIC-CRUST ; UPPER-MANTLE ; NEWFOUNDLAND APPALACHIANS ; WESTERN NEWFOUNDLAND ; BASALT ALTERATION ; RIDGE BASALTS ; FLUID FLUXES ; BAY ; SEAWATER |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/204857 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Harvard Univ, Dept Earth & Planetary Sci, 20 Oxford St, Cambridge, MA 02138 USA; 2.Washington Univ, Dept Earth & Planetary Sci, St Louis, MO 63130 USA; 3.Washington Univ, McDonnell Ctr Space Sci, St Louis, MO 63130 USA |
推荐引用方式 GB/T 7714 | Parendo, Christopher A.,Jacobsen, Stein B.,Wang, Kun. K isotopes as a tracer of seafloor hydrothermal alteration[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2017,114(8):1827-1831. |
APA | Parendo, Christopher A.,Jacobsen, Stein B.,&Wang, Kun.(2017).K isotopes as a tracer of seafloor hydrothermal alteration.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,114(8),1827-1831. |
MLA | Parendo, Christopher A.,et al."K isotopes as a tracer of seafloor hydrothermal alteration".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 114.8(2017):1827-1831. |
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