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首页> 外文期刊>Planetary and space science >Relationship of coronae, regional plains and rift zones on Venus
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Relationship of coronae, regional plains and rift zones on Venus

机译：金星上日冕，区域平原和裂谷带的关系

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摘要

Coronae and rifts are the most prominent volcano-tectonic features on the surface of Venus. Coronae are large radial-concentric structures with diameters of 100 to over 1000 km. They have varied topographical shapes, radial and concentric fracturing and compressional tectonic structures are common for their annuli. Massive volcanism is also connected with some of the structures. Coronae are interpreted to be the result of updoming and fracturing on the surface due to interaction of mantle diapirs with the lithosphere and its subsequent gravitational relaxation. According to Stofan et al. (2001), two types of coronae are observed: type 1—coronae that have annuli of concentric ridges and/or fractures (407 structures), and type 2 that have similar characteristics to type 1 but lack a complete ; annulus of ridges and fractures (107 structures). We analyzed 20% of this coronae population (we chose ' each fifth structure from the Stofan et al. (2001) catalog; 82 coronae of type 1 and 22 coronae of type 2, in total 104 coronae) for the (1) spatial distribution of rift structures and time relationship of rift zones activity with time of regional volcanic plains emplacement, and (2) tectonics, volcanism, age relative to regional plains and relationship with rifts. Two different age groups of rifts on Venus were mapped at the scale 1:50 000 000: old rifts that predate and young rifts that postdate regional plains. Most of young rifts inherit strikes of old rifts and old rifts are reworked by them. This may be evidence of rift-produced uplift zones that were probably mostly stable during both types of rifts formation. Evolution of distribution of rift systems with time (decreasing of distribution and localization of rift zones) imply thickening of the lithosphere with time. Coronae-producing mantle diapirism and uplift of mantle material in rift zones are not well correlated at least in time in most cases, because majority of coronae (77%) of both types has no genetic association with rifts. Majority of coronae (72%) were mostly active before regional plains formation, and only 3% appear to have begun to form after the plains emplacement, which may be also due to thickening of the lithosphere. According to the relationship with regional plains type 2 coronae are in general older than type 1 coronae. Three types of corona-related volcanic activity were observed: shield volcanoes and their clusters, as well as extensive lobate lava flows and smooth volcanic plains. Shield volcanoes during coronae evolution were mostly active before regional plains emplacement. Most active phase of volcanism of corona may not coincide with the time of the major tectonic activity of corona, as majority of coronae (77%) were most active before regional plains formation, but almost half of all coronae have traces of post regional plains volcanism. Detailed mapping and stratigraphic analysis of seven regions with 34 examples of coronae showed a similarity in the sequence of regional geologic units.
机译：日冕和裂谷是金星表面最突出的火山构造特征。日冕是直径为100至1000公里以上的大型径向同心结构。它们具有多种多样的地形形状，径向和同心压裂以及压缩构造构造因其环空而普遍。大规模的火山活动也与某些结构有关。电晕被认为是由于地幔底盘与岩石圈的相互作用及其随后的重力松弛作用而在表面上向上和破裂的结果。据斯托凡等。 （2001年），观察到两种类型的日冕：1型-具有同心脊和/或裂缝环（407结构）的日冕，和2型具有与1型相似的特征，但缺乏完整的日冕；脊和裂缝的环面（107个结构）。我们分析了20％的这种日冕（我们从Stofan等人（2001）目录中选择了每个第五个结构; 1型的82个日冕和2型的22个日冕，总共104个日冕）（1）空间分布裂谷构造的裂谷构造，裂谷带活动的时间关系与区域性火山平原侵袭时间的关系，以及（2）构造，火山作用，相对于区域平原的年龄以及与裂谷的关系。金星上的裂谷的两个不同年龄组以1:50 000 000的比例绘制：早于年代的旧裂痕和早于区域平原的年轻裂痕。大多数年轻的裂痕会继承老裂痕的罢工，老裂痕会被它们重做。这可能是裂谷产生的隆升带的证据，在两种类型的裂谷形成过程中，隆起带可能基本稳定。裂谷系统的分布随时间变化（裂谷区域的分布减小和局部化）意味着岩石圈随时间而增厚。在大多数情况下，至少在大多数情况下，至少在时间上，日冕产生的地幔扩散和裂谷带中地幔物质的上升没有很好的相关性，因为这两种类型的日冕中的大多数（77％）都与裂谷没有遗传联系。大多数日冕（72％）在区域平原形成之前就很活跃，而只有3％似乎在平原就位之后开始形成，这也可能是由于岩石圈增厚所致。根据与区域平原的关系，2型日冕通常比1型日冕更老。观察到了三种与日冕有关的火山活动：盾构火山及其簇，以及广泛的叶状熔岩流和光滑的火山平原。日冕演化过程中的盾构火山在区域性平原就位之前大多活跃。日冕的火山活动最活跃的时期可能与日冕的主要构造活动的时间不一致，因为大部分日冕（77％）在区域平原形成之前最活跃，但几乎所有日冕中有一半是区域平原之后的火山活动的痕迹。七个地区的详细制图和地层分析（含34个日冕）显示了区域地质单位序列的相似性。

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  • 来源
    《Planetary and space science》 |2012年第1期|p.56-75|共20页
  • 作者

    A.S. Krassilnikov; V.-P. Kostama; M. Aittola; E.N. Guseva; O.S. Cherkashina;

  • 作者单位

    Department of Project Generation and Prospecting, 36/2, bld. 3, Arbat Str., Moscow, 119002, Russia,University of Outu, Department of Physics, Astronomy Division, P.O. Box. 3000, FIN-90014 Oulu, Finland;

    University of Outu, Department of Physics, Astronomy Division, P.O. Box. 3000, FIN-90014 Oulu, Finland;

    University of Outu, Department of Physics, Astronomy Division, P.O. Box. 3000, FIN-90014 Oulu, Finland, University of Oulu, Oulu Southern Institute, Pajatie 5, FlN-85500 Nivala, Finland;

    Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Science, 119991 Moscow, Russia,Moscow State University, Geological Department, 119234 Moscow, Russia;

    Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Science, 119991 Moscow, Russia,Moscow State University, Geological Department, 119234 Moscow, Russia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    venus; corona; regional plains; rift zones; volcanism; tectonics;

    机译：金星;电晕;区域平原裂谷带;火山构造学;

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