What do you think separates diagenesis from metamorphism?
Answers
The boundary between diagenesis and metamorphism is based on both mineralogical and textural criteria, which do not always coincide. Boundaries based on the generation of new minerals are highly subjective and the temperature can vary depending on which minerals are used as indicators.
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Explanation:
Diagnesis is the process that turns the sedimentary deposits (think silt, mud, sand, etc.) into a sedimentary rock. Let’s take a beach for example. In a simple view, the beach is made up of loosely bound sand and water. Let’s say that over time that beach is covered up by additional material and no longer has access to that water. Over time some of the water is removed and chemical processes cement the sand together to form a sandstone. Diagnesis is generally seen as a low temperature and low pressure process.
On the other hand, metamorphism alters rock in a high temperature and high pressure. In this scenario a rock made up of it’s particular minerals is heated and subjected to enough pressure that the actual mineral grains can reform into other minerals or reorganize in different directions in response to the pressure and temperature. An example would be subjecting granite to enough heat and pressure to turn it into a rock called gneiss.