The impact of tectonic-style on marine transgression and evolution

IF 1.7 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS International Journal of Astrobiology Pub Date : 2021-04-27 DOI:10.1017/S1473550421000082
D. Stevenson
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Abstract

Plate tectonics drives variation in sea-level, over intervals of approximately107–108years. These variations may have significant effects on the pace of (biological) evolution through the elimination of terrestrial niches and the expansion of shallow-water marine niches. However, within the solar system, only the Earth experiences this kind of tectonism. Venus displays regional tectonism, characterized by rising diapirs within the plastic mantle. Impinging on the lithosphere, these plumes produce a range of structures of varying dimensions; the uplift of which would raise sea-level, were Venus to have oceans. Using Magellan observations of Venus, we model the impact of regional tectonism on sea-level for given areas of Venusian ocean, then compare the effect with terrestrial tectonic processes for similar oceanic area. We show that despite variation in the geographical extent of Venusian-style tectonic processes, the styles of regional tectonism on Venus can produce the same order of magnitude changes in sea-level, for a given area of ocean, as plate tectonics. Consequently, we examine some of the impacts of marine transgression on habitability and the evolution of life.
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构造样式对海侵演化的影响
板块构造在大约107 - 108年的时间间隔内驱动着海平面的变化。这些变化可能通过消除陆地生态位和扩大浅水海洋生态位而对(生物)进化的速度产生重大影响。然而,在太阳系中,只有地球经历过这种构造运动。金星表现出区域构造作用,其特征是在可塑的地幔中有上升的底辟。这些岩浆柱撞击岩石圈,产生一系列不同尺寸的结构;如果金星上有海洋,它的隆起会提高海平面。利用麦哲伦对金星的观测,我们模拟了金星海洋特定区域的区域构造运动对海平面的影响,并将其与相似海洋区域的陆地构造运动的影响进行了比较。我们表明,尽管金星式构造过程的地理范围有所不同,但金星上的区域构造活动的风格可以在给定的海洋区域产生与板块构造相同的海平面变化数量级。因此,我们研究了海侵对可居住性和生命进化的一些影响。
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来源期刊
International Journal of Astrobiology
International Journal of Astrobiology 地学天文-地球科学综合
CiteScore
3.70
自引率
11.80%
发文量
45
审稿时长
>12 weeks
期刊介绍: International Journal of Astrobiology is the peer-reviewed forum for practitioners in this exciting interdisciplinary field. Coverage includes cosmic prebiotic chemistry, planetary evolution, the search for planetary systems and habitable zones, extremophile biology and experimental simulation of extraterrestrial environments, Mars as an abode of life, life detection in our solar system and beyond, the search for extraterrestrial intelligence, the history of the science of astrobiology, as well as societal and educational aspects of astrobiology. Occasionally an issue of the journal is devoted to the keynote plenary research papers from an international meeting. A notable feature of the journal is the global distribution of its authors.
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