石英脉的形成需要在Si液体浓缩。通常如果溶解在邻近的形成,被液体运输和沉淀,流体压力低(液体Si-saturation容量增加而增加流体压力)。流体压力通常是参与破碎岩石。builts-up时,它可以在岩石裂缝。反过来,从而生成骨折容纳孔隙空间,因此流体的流体压力下降,如果沉淀形成静脉。这些静脉重新封装和restrengthen岩石,这又会导致新一轮的排泄组合。这个过程被称为crack-seal静脉形成。通常,crack-seal静脉形成逐步发生,这是一个非常好的事情:研究静脉内部矿物结构给过去的压力制度条件的证据。这些证据可以帮助解开大地构造的演化,山的形成或断层系统等。石英脉是非常普遍的,他们需要disolvable Si的来源,这是一个非常丰富的元素。 In carbonate rocks, calcite veins are more common. The crack-seal principle applies for them just the same. Yes, you can see veins in satelite pictures! Have a look here: [OMAN][1] (These are calcite veins standing out against a dark lime-stone). Hope this helps, Ben P.S.: You might want to have a look at my thesis on (calcite) vein-networks in Oman: [LINK][2]. [1]: https://www.google.de/maps/place/Oman/@23.2730986,57.1338697,412m/data=!3m1!1e3!4m5!3m4!1s0x3dd69f66a9d59bbf:0x3a064c7665b1a817!8m2!3d21.4735329!4d55.975413?hl=de [2]: http://publications.rwth-aachen.de/record/230296