Final answer:
Interaction of soil with glacial melt water is not a mechanism by which metamorphic rocks are produced, as it leads to physical and chemical weathering, more commonly associated with sedimentary rock formation. The correct answer is option: 3. interaction of soil with glacial melt water.
Step-by-step explanation:
The mechanism by which metamorphic rocks are not produced is 'interaction of soil with glacial melt water'. Metamorphism involves the alteration of pre-existing rocks through changes in temperature, pressure, or chemical reactions, typically under solid Earth conditions.
The processes that contribute to the formation of metamorphic rocks include heating by a magma body, chemical reaction with hot water, burial in a sedimentary basin, and burial at a convergent plate boundary.
However, the interaction of soil with glacial melt water pertains to physical and chemical weathering processes more so than metamorphism, and typically leads to the formation of sedimentary rocks.