Some of the Earth’s oldest rocks may have formed from the high temperatures of meteorite impacts, a new study reports. Granite-like, or felsic, rocks in northwest Canada dating back to the Earth ...

What processes can form intermediate and felsic magmas from a melt that is originally mafic? When assimilation occurs, a magma gains country rock. It is possible for mafic magmas to melt and change ...

Scientists have found that 4.02-billion-year-old silica-rich felsic rocks from the Acasta River, Canada -- the oldest rock formation known on Earth -- probably formed at high temperatures and at a ...

Scientists have found that 4.02 billion year old silica-rich felsic rocks from the Acasta River, Canada -- the oldest rock formation known on Earth -- probably formed at high temperatures and at a ...

The rocks at the surface of the modern Earth are broadly divided into two types: felsic and mafic. Felsic rocks are generally relatively low density — for a rock — and light in colour because ...

However, due to heat from the Earth’s core, the heating of the mantle prevents felsic melts. Lee aimed to understanding the felsic composition of the continents.

He contends felsic rocks can form anytime mafic rocks sink deep within Earth—and not only along subduction zones. In fact, he argues this process can occur on a motionless plate.

A melt occurs when crustal rocks are partially melted and incorporated, resulting in silica content that is intermediate or felsic. -Traces of volatiles found inside a viscous (sticky) magma tend to ...

The difference in density between felsic and mafic rocks means that felsic rocks are more buoyant, and therefore sit at higher elevations above the Earth’s mantle (the layer inside the Earth ...

Scientists have found that 4.02 billion year old silica-rich felsic rocks from the Acasta River, Canada – the oldest rock formation known on Earth – probably formed at high temperatures and at ...