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冕狀物

金星冕狀物的形成過程

行星地质学中,冕狀物Corona,複數形 coronae)是行星表面的一種卵形結構。這種結構出現在金星天王星的衛星天衛五。此種地形可能是由地表下熱物質上湧形成。

金星上的冕狀物

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福德拉冕状物

金星上的冕狀物是類似皇冠的大型(直徑通常是數百公里)火山活動地質特徵。

冕狀物首先是在1983年由金星15號金星16號合成孔徑雷達影像中確認,而這些區域有部分過去被認為是撞擊坑。

一般认为冕狀物是因為金星地幔中的羽狀熱物质向上推動金星外殼,形成圓頂狀結構,之後中心崩潰,且岩漿冷卻並從側面流出,留下皇冠狀結構:冕狀物。

金星上最大的冕狀物是阿尔忒弥斯冕状物,直徑2100公里。

天衛五上的冕狀物

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天卫五印威内斯冕状物,直径235公里)

天王星衛星天衛五上的這種卵形結構相對於其體積是相當大的。可能是由貫入作用形成:高溫冰的上升[1]

注釋

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  1. ^ R., Pappalardo; Greeley, R. Structural evidence for reorientation of Miranda about a paleo-pole. In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z: 1111–1112. 1993 [2006-08-05]. (原始内容存档于2019-10-29). 
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冕狀物
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