喷气锥
2014-03-05 00:00:00
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<span style="line-height:2;font-family:SimSun;font-size:14px;"> 喷气锥是炽热的熔岩流使其底部的地表水气化而产生大</span><span style="line-height:2;font-family:SimSun;font-size:14px;">量气体,并不断外逸而吹动熔岩外掀所形成的构造。每次气体</span><span style="line-height:2;font-family:SimSun;font-size:14px;">喷出就伴随有一些熔浆外溢,或形成熔岩饼,在喷出口层层相</span><span style="line-height:2;font-family:SimSun;font-size:14px;">叠,形成叠瓦状的口垣。这样间歇喷逸多次并逐渐向上堆叠</span><span style="line-height:2;font-family:SimSun;font-size:14px;">起来,形成了锥状的熔岩构造,即喷气锥。喷气口直径一般</span><span style="line-height:2;font-family:SimSun;font-size:14px;">0.8~1.5米,喷气通道一般呈上细下粗的锥管状,通道壁上有</span><span style="line-height:2;font-family:SimSun;font-size:14px;">明显的熔岩喷气构造。</span>
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<img width="600" height="421" alt="" src="/public/html_images/20140305/20140305001407_93.png" />
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<span style="line-height:2;font-size:14px;">喷气锥</span>
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