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Heat and pressure change shale into metamorphic rock, specifically slate when exposed to low to moderate levels of heat and pressure, and then further into phyllite, schist, and gneiss as the intensity of heat and pressure increases.
when shale is subjected to heat and pressure, it can be metamorphosed into slate.
Shale changes into slate through a process called metamorphism, which involves heat, pressure, and chemical changes. The heat and pressure cause the minerals in the shale to recrystallize into a denser, more compact form, resulting in the fine-grained texture and foliation characteristic of slate. The composition of the original shale, as well as the intensity and duration of the metamorphic conditions, influence the final characteristics of the slate.
Slate is primarily a sedimentary rock, originating from very fine clays deposited in deep water - or at least distant from shore. It is only mildly metamorphosed by heat and pressure. Often a good source of fossils.Obsidian on the other hand is volcanic glass, generally derived from melting and re-freezing of rhyolite lava
subjected to heat and pressure. The intense heat and pressure cause the shale's minerals to recrystallize, giving rise to the fine-grained texture and foliation characteristic of slate.
Slate is the metamorphic rock that forms from shale after it is exposed to heat and pressure for a llllloooooonnnnnnnggggg time.
If you apply shale with intense heat and pressure. you'll get slate. Now just apply intense heat and pressure to the slate an over time you'll get your schist
High pressure can cause the formation of the metamorphic rock slate from the sedimentary rock shale.
Heat and pressure create metamorphic rock. This type of rock forms when existing rocks are subjected to intense heat and pressure, causing their mineral composition and texture to change. Examples of metamorphic rocks include marble, slate, and schist.
Shale undergoes metamorphism and transforms into slate, then phyllite, followed by schist, and eventually gneiss as heat and pressure increase. This progression represents a sequence of increasing metamorphic grade from low (slate) to high (gneiss) with changes in mineral composition and texture.