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Formation Time of No. 3 Vein and Pegmatite
The No. 3 vein is located at the southwest edge of the Keketuohai pegmatite field in the middle of the Altay Mountains. Its origin can be traced back to the rare metal metallogenic belt in this area. Based on scientific calculations, this vein was created approximately 209 million years ago during the Indosinian period, which is intricately linked to the uplifting process of the Altay Mountains.
The vein was formed in pegmatite. What is pegmatite? Pegmatite is a type of rock characterized by its remarkably large mineral crystals. Typically consisting of expansive crystals of potash feldspar, quartz, and mica, pegmatite forms as a result of the crystallization of pegmatitic magma. The straw hat-shaped formation came into being when pegmatitic magma infiltrated into the enclosing rock from within the Earth. During the process of vein formation, why did the formation not collapse?The reason behind this phenomenon is that the pegmatitic magma in this area follows a specific p attern known as 'magma uplifting the enclosing rock to create a designated space'. In other words, the lower magma relies on its robust buoyancy to gradually elevate the overlying enclosing rock, thereby expanding the available space.
Schematic Diagram of Magma Intrusion
