< p >简短的回答,有各种各样的估计,有大量的不确定性,从4到700万公里<一口> 2 < /一口>。< / p > < p >从< a href = " https://www.le.ac.uk/gl/ads/SiberianTraps/AreaVolume.html " rel = " nofollow noreferrer " >链接提供的< / > < a href = " //www.hoelymoley.com/users/6535/keith-mcclary " >基斯麦克在评论中< / >:< / p > < blockquote > < p >估计原始的陷阱是困难的,考虑到可能侵蚀过去250 Ma。这是特别重要的相对容易侵蚀火山碎屑沉积。同时保存可能已经提高了埋葬在西西伯利亚盆地和Yenesei-Khatanga槽,目前还不清楚有多少构造隆升和侵蚀发生在这些盆地三叠纪早期,前埋葬。Milanovskiy(1976)估计,最初的陷阱是大约4 x10 <一口> < /一口> 6公里2 <一口> < / >一同晚餐,但必须有相当大的自由在这个图。Masaitis(1983),例如,最初认为陷阱区域扩展的~ 700万公里<一口> 2 < /一口>。< / p > < /引用> < p > Masaitis,做的,1983年。< a href = " https://scholar.google.com/scholar_lookup?title=Permian%20and%20Triassic%20volcanism%20of%20Siberia: % 20问题% 20 % 20动态% 20 reconstructions. % 20笔记% 20的% 20 % 20全% 20矿物学% 20 society&作者= Masaitis % 20 v.l。amp; publication_year = 1983,杂志= Zap. % 20 vseross. % 20 miner. % 20观察。amp;体积= 112,= e2 % 412% 80% 93425页“rel = " nofollow noreferrer " >二叠纪与三叠纪西伯利亚火山活动:动态重构问题< / >。Mineralogicheskogo Obshchestva, 112 (4): 412 - 425。< / p > < p > Milanovskiy、陈文贤,1976年。< a href = " https://www.tandfonline.com/doi/abs/10.1080/00206817609471257 " rel = " nofollow noreferrer " >裂谷地区的地质历史及其相关形成< / >。国际地质审查,18:619 - 639。 Additionally I have found another estimate Saunders (2009):
The original total area (and volume) of the Siberian flood basalt province is difficult to estimate, because a substantial portion is covered by thick sedimentary se- quences and because an unknown amount has been re- moved by erosion. Taking the limits of the existing out- crops as a maximum extent, then we estimate that an area of approximately 5×106 km2 of Siberia may have been partly covered by basalt1. It is unlikely that an accurate figure of area (and volume) will ever be known.
Saunders, A., Reichow, M. The Siberian Traps and the End-Permian mass extinction: a critical review. Chin. Sci. Bull. 54, 20–37 (2009). https://doi.org/10.1007/s11434-008-0543-7