Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1901642116 |
Low-gradient, single-threaded rivers prior to greening of the continents | |
Ganti, Vamsi1,2; Whittaker, Alexander C.3; Lamb, Michael P.4; Fischer, Woodward W.4 | |
2019 | |
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 | 2019 |
卷号 | 116期号:24页码:11652-11657 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; England |
英文摘要 | The Silurian-age rise of land plants is hypothesized to have caused a global revolution in the mechanics of rivers. In the absence of vegetation-controlled bank stabilization effects, pre-Silurian rivers are thought to be characterized by shallow, multithreaded flows, and steep river gradients. This hypothesis, however, is at odds with the pancontinental scale of early Neoproterozoic river systems that would have necessitated extraordinarily high mountains if such river gradients were commonplace at continental scale, which is inconsistent with constraints on lithospheric thickness. To reconcile these observations, we generated estimates of paleogradients and morphologies of pre-Silurian rivers using a well-developed quantitative framework based on the formation of river bars and dunes. We combined data from previous work with original field measurements of the scale, texture, and structure of fluvial deposits in Proterozoic-age Torridonian Group, Scotland-a type-example of pancontinental, prevegetation fluvial systems. Results showed that these rivers were low sloping (gradients 10(-5) to 10(-4)), relatively deep (4 to 15 m), and had morphology similar to modern, lowland rivers. Our results provide mechanistic evidence for the abundance of low gradient, single-threaded rivers in the Proterozoic eon, at a time well before the evolution and radiation of land plants-despite the absence of muddy and vegetated floodplains. Single-threaded rivers with stable floodplains appear to have been a persistent feature of our planet despite singular changes in its terrestrial biota. |
英文关键词 | prevegetation alluvium cross-stratification Neoproterozoic Era |
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:000471039700020 |
WOS关键词 | TORRIDONIAN ROCKS ; LATERAL ACCRETION ; EVOLUTION ; LAND ; GEOCHRONOLOGY ; THICKNESS ; SCOTLAND ; CHANNELS ; PLANTS |
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/205128 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Univ Calif Santa Barbara, Dept Geog, Santa Barbara, CA 93106 USA; 2.Univ Calif Santa Barbara, Dept Earth Sci, Santa Barbara, CA 93106 USA; 3.Imperial Coll London, Dept Earth Sci & Engn, London SW7 2AZ, England; 4.CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA |
推荐引用方式 GB/T 7714 | Ganti, Vamsi,Whittaker, Alexander C.,Lamb, Michael P.,et al. Low-gradient, single-threaded rivers prior to greening of the continents[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2019,116(24):11652-11657. |
APA | Ganti, Vamsi,Whittaker, Alexander C.,Lamb, Michael P.,&Fischer, Woodward W..(2019).Low-gradient, single-threaded rivers prior to greening of the continents.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,116(24),11652-11657. |
MLA | Ganti, Vamsi,et al."Low-gradient, single-threaded rivers prior to greening of the continents".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 116.24(2019):11652-11657. |
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