What are phenocrysts and groundmass in volcanic rocks, and what do they tell us about magma evolution?

Hotspots at the seafloor create subsea volcanoes; building upward, they ultimately become volcanic islands. Hotspots are stationary but the crusts above them ... A frequently-used hypothesis suggests that hotspots form over exceptionally hot regions in the mantle, which is the hot, flowing layer of the Earth beneath the ... Aug 12, 2024 ... Volcanic hotspots are how the Hawaiian Islands were formed. Many volcanoes form at tectonic plate edges, but some erupt from a stationary point ... A volcanic hotspot is where magma pushes up from under the mantle and creates a volcano. The earth's plates move along and another volcano is created later. Feb 24, 2022 ... Despite the geographical distance and separation by the Great Dividing Range, these authors found that the volcanoes developed parallel and ... Part of the Cutting Edge collection. The NAGT/DLESE On the Cutting Edge project helps geoscience faculty stay up-to-date with both geoscience research and ... A hotspot is a small area within the mantle which is of a higher temperature than the area surrounding it, and is usually associated with volcanic activity. In geology, hotspots (or hot spots) are volcanic locales thought to be fed by underlying mantle that is anomalously hot compared with the surrounding mantle ... La Grille, Unknown - Evidence Credible, Comoros Hotspot Volcano Group, Shield ; Karthala, 2007 CE, Comoros Hotspot Volcano Group, Shield ... 2. How does magma get to the Earth's crust to create a hotspot volcano? · Magma travels to Earth's surface through an upward tunnel from deep within Earth.