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Cryovolcanism and Degassing on Titan, a Moon of Saturn
Journal of Volcanology and Seismology ( IF 0.7 ) Pub Date : 2021-06-09 , DOI: 10.1134/s0742046321030040
L. K. Malysheva , A. I. Malyshev

Abstract—

This paper considers the occurrence, diversity, and special features of volcanic and degassing processes on Titan, as well as analyzing the maximum gas concentrations of volatiles in a vertical profile of its interior and atmosphere. We showed that the specific character of Titan volcanic and degassing processes is due to low temperatures, a peculiar material composition, and the ubiquitous presence of a subsurface liquid horizon. Consequently, the common (on Earth) forms of (cryo)volcanic activity are reduced, while the more common forms include (1) gas-lifting degassing, which produces numerous, small, depressions with a higher level of liquid, and which is a probable cause of “magic islands” in Ligeia Mare, as well as (2) limnological discharges of gaseous methane with subsequent intensive cloud formation, occurrence of methane storms, and large-volume precipitation. In turn, both gas-lifting degassing and limnological discharges of endogenous methane are due to the condensate–gas inversion at depths of 1–2 km in Titan’s interior. Below that depth, the endogenous fluids are nearly all gasless condensates, while above, these condensates start intensive boiling. We conclude that degassing is the most important relief-forming factor on Titan.



中文翻译:

土星卫星泰坦上的低温火山作用和脱气

摘要-

本文考虑了泰坦上火山和脱气过程的发生、多样性和特征,并分析了其内部和大气垂直剖面中挥发物的最大气体浓度。我们表明,泰坦火山和脱气过程的特定特征是由于低温、特殊的材料成分以及地下液体层的普遍存在。因此,(地球上)常见的(低温)火山活动形式减少了,而更常见的形式包括 (1) 气举脱气,它会产生许多具有较高液位的小型凹陷,这是一种Ligeia Mare 中“魔法岛”的可能原因,以及 (2) 气态甲烷的湖沼排放以及随后的密集云形成、甲烷风暴的发生、和大量降水。反过来,内源性甲烷的气举脱气和湖沼学排放都是由于泰坦内部 1-2 公里深处的凝析气反演造成的。在该深度以下,内源流体几乎都是无气冷凝物,而在此深度以下,这些冷凝物开始剧烈沸腾。我们得出结论,脱气是泰坦上最重要的浮雕形成因素。

更新日期:2021-06-09
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