为什么(一些)硅的身体表现得热情洋溢地行为而不是爆炸共同点呢?- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换 最近30从www.hoelymoley.com 2023 - 07 - 09 - t14:05:21z //www.hoelymoley.com/feeds/question/18035 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/18035 7 为什么(一些)硅的身体表现得热情洋溢地行为而不是爆炸共同点呢? 主任Muharrem• //www.hoelymoley.com/users/15195 2019 - 09 - 20 - t09:48:48z 2020 - 01 - 15 - t10:15:25z < p >我们遇到dacitic /流纹岩融化一般在火山爆发的事件。但有些像的圆顶流。为什么有些含硅的身体表现得热情洋溢地? < / p > //www.hoelymoley.com/questions/18035/-/18057 # 18057 5 由Gimelist回答为什么(一些)硅的身体表现得热情洋溢地行为而不是爆炸共同点呢? Gimelist //www.hoelymoley.com/users/725 2019 - 09 - 23 - t10:33:57z 2019 - 09 - 23 - t10:33:57z < p >爆炸性火山事件发生主要是因为气体的饱和度和增加压力高于岩浆库的顶部的力量。岩浆解压缩或冷却,2 H <子> < /订阅> O(大部分),有限公司<子> 2 < /订阅>(也很重要),和其他气体,如2 H <子> < /订阅>,<子> 2 < /订阅>、盐酸、等,形成泡沫和增加体积。如果岩浆库限制,还有增加的压力。< / p > < p >一个明显的推论是,气体必须在场。如果岩浆主要是干燥和volatile-free,没有挥发性物种形成泡沫和岩浆不能爆炸。< / p > < p >另一个因素是岩浆的粘度。粘性越少,就越容易为岩浆流(而不是建立压力),也就越容易逃避岩浆气泡。岩浆粘度取决于温度(热=少粘性)、作文(多碱金属=少粘性),晶体内容(少晶体=粘性)。< / p > < p >综上所述,热碱性岩浆没有水晶和挥发性物种会流,而冷部分结晶湿sub-alkali岩浆可能会爆炸,即使他们有相同的SiO <子> 2。< / p > < /订阅>内容 //www.hoelymoley.com/questions/18035/-/18295 # 18295 5 为什么回答的让-玛丽•Prival(一些)硅的身体表现得热情洋溢地行为而不是爆炸共同点呢? 让-玛丽•Prival //www.hoelymoley.com/users/18081 2019 - 10 - 25 - t13:24:47z 2020 - 01 - 15 - t10:15:25z < p >完成Gimelist的回答是:许多硅的穹顶和流躺上一个火山灰层相同年龄和成分。See for instance this classic paper of Fink (1980) about Little Glass Mountain. This is interpreted as follow: a gas-rich magma ascends into a conduit and, because of its high volatile content, fragments, leading to an explosive eruption. The vent opening allows the rest of the magma to degas: it erupts effusively. Hence the lava flow or dome is emplaced on the tephra layer.

In 2011-2012, there was an eruption at Cordon Caulle (Chile) that showed that both dynamics can even happen at the same time! There was magma explosion and effusion from the same vent, simultaneously. This is explained by Castro et al. (2013) by a dyke geometry (figure 7) allowing some magma to ascend more slowly, thus having more time to degas. Schipper et al. (2013) also proposed a conduit model (figure 10) where shear zonation creates a network of permeable magma through which the explosive activity occurs.

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