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第268章 石棉县城处于无政府状态(2 / 2)

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石棉县距离雅安镇,在地震发生之前,交通方便的情况下,骑快马也得一天的时间。现在交通不便,几天能到就不知道了。

赵小英和包太平两个人骑马赶路,遇见过不去的路就绕路。临近傍晚的时候,前面遇见了早就冷却了的岩浆岩。

岩浆岩又称火成岩,是由岩浆喷出地表或侵入地壳冷却凝固所形成的岩石,有明显的矿物晶体颗粒或气孔,约占地壳总体积的65%,总质量的95%。

岩浆是在地壳深处或上地幔产生的高温炽热、粘稠、含有挥发分的硅酸盐熔融体,是形成各种岩浆岩和岩浆矿床的母体。岩浆的发生、运移、聚集、变化及冷凝成岩的全部过程,称为岩浆作用。

岩浆岩是岩浆侵入地壳或喷出地表后冷凝而成的岩石。是组成地壳的主要岩石。分侵入岩和喷出岩两种。

侵入岩由于在地下深处冷凝,故结晶好,矿物成分一般肉眼即可辨认,常为块状构造,按其侵入部位深度的不同,分深成岩和浅成岩。

喷出岩为岩浆突然喷出地表,在温度、压力突变的条件下形成,矿物不易结晶,常具隐晶质或玻璃质结构,一般矿物肉眼较难辨认

常见的岩浆岩有花岗岩、花岗斑岩、流纹岩、正长岩、粗面岩、闪长岩、安山岩、辉长岩和玄武岩等。

岩浆岩中可以形成的宝石种类丰富,主要包括钻石、红宝石、蓝宝石……

?钻石?:钻石主要形成于金伯利岩和钾镁煌斑岩中。金伯利岩是钻石的主要成矿母岩,而钾镁煌斑岩则生产彩色钻石。

?红宝石和蓝宝石?:红宝石和蓝宝石常形成于玄武岩中。中国东部的玄武岩带,如山东的昌乐蓝宝石,是着名的宝石产地?。

?海蓝宝石?:海蓝宝石主要形成于花岗伟晶岩中。这种岩石中的宝石通常晶体巨大,透明度高,净度好,是优质宝石。

还有?其他的宝石?:岩浆岩中还可以形成其他类型的宝石,如锆石、石榴石、辉石等。这些宝石常与钻石、红宝石和蓝宝石伴生,且通常颜色鲜艳?。

宝石形成机制和地质条件苛刻,这些宝石的形成需要一个稳定的地质环境,包括稳定的物质来源供给和温压环境。

钻石、红宝石和蓝宝石等宝石主要形成于地球的深部,由于没有足够的空间,形成的宝石矿物相对较小?。相比之下,侵入岩中的宝石由于有足够的时间冷却,形成的矿物颗粒尺寸较大?。

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