Question

The isotopically derived date is a measure of time since the rock material itself cooled into a solid. It is possible that a rock can be re-heated to the point of "re-setting" the isotopic system. Which major rock type is most likely to be affected by the process of re-heating?

1) Igneous rocks
2) Metamorphic rocks
3) Sedimentary rocks
4) Volcanic rocks

Answer 1

Metamorphic rocks are the most likely to be affected by the process of re-heating, as they undergo changes in their mineral composition and texture when subjected to high heat and pressure.

Step-by-step explanation:

Metamorphic rocks are the most likely to be affected by the process of re-heating. This is because metamorphic rocks are formed when existing rocks are subjected to high heat and pressure, causing them to change their mineral composition and texture. If these rocks are re-heated, it can lead to further changes in their mineralogy and the resetting of isotopic systems, making it difficult to accurately determine their age using radiometric dating.