what is the silica content of magma that has low velocity
To determine the silica content of magma with low velocity, we first need to understand how magma velocity and silica content are related.
Magma velocity is influenced by various factors, including viscosity, temperature, and composition. Silica content, on the other hand, refers to the amount of silica (SiO2) present in the magma.
In general, magma with higher silica content tends to have higher viscosity, which means it flows more slowly. This is because silica-rich magma forms more complex and interconnected structures, making it thicker and less fluid.
Therefore, if you have magma with low velocity (flows slowly), it is likely to have a higher silica content.
To obtain the exact silica content, scientists use chemical analyses of the magma. The most common method is to collect samples of the magma or volcanic rock and analyze them in a laboratory. This process involves crushing the sample into a fine powder, digesting it with acid, and then using various instruments to measure the silica content.
So, to determine the silica content of a magma with low velocity, you would need to collect a sample of the magma and send it to a laboratory for analysis.
Granitic magma has high viscosity and therefore flows slowly. The silica content of granitic magma is high, ranges from 40 to 75%.
See also:
http://www.geology.wisc.edu/courses/g410/%20web%20files/L3-IgnRocks.htm