enow.com Web Search

Search results

1. Results from the WOW.Com Content Network

2. Alkaline magma series - Wikipedia

   en.wikipedia.org/wiki/Alkaline_magma_series

   Geologic context. Alkaline magmas are characteristic of continental rifting, areas overlying deeply subducted plates, or at intraplate hotspots. [2]: Ch6 They are more likely to be generated at greater depths in the mantle than subalkaline magmas. [2]: Ch23.6. Alkaline rocks are rare in the Archean, but become common in the Proterozoic.

3. Tholeiitic magma series - Wikipedia

   en.wikipedia.org/wiki/Tholeiitic_Magma_Series

   The tholeiitic magma series (/ ˌθoʊliˈaɪtɪk /) is one of two main magma series in subalkaline igneous rocks, the other being the calc-alkaline series. A magma series is a chemically distinct range of magma compositions that describes the evolution of a mafic magma into a more evolved, silica rich end member. Rock types of the tholeiitic ...

4. Calc-alkaline magma series - Wikipedia

   en.wikipedia.org/wiki/Calc-alkaline_magma_series

   The calc-alkaline magma series is one of two main subdivisions of the subalkaline magma series, the other subalkaline magma series being the tholeiitic series. A magma series is a series of compositions that describes the evolution of a mafic magma, which is high in magnesium and iron and produces basalt or gabbro, as it fractionally crystallizes to become a felsic magma, which is low in ...

5. Trachyandesite - Wikipedia

   en.wikipedia.org/wiki/Trachyandesite

   Trachyandesite is an extrusive igneous rock with a composition between trachyte and andesite. It has little or no free quartz, but is dominated by sodic plagioclase and alkali feldspar. It is formed from the cooling of lava enriched in alkali metals and with an intermediate content of silica. [1][2]

6. Igneous differentiation - Wikipedia

   en.wikipedia.org/wiki/Igneous_differentiation

   In geology, igneous differentiation, or magmatic differentiation, is an umbrella term for the various processes by which magmas undergo bulk chemical change during the partial melting process, cooling, emplacement, or eruption. The sequence of (usually increasingly silicic) magmas produced by igneous differentiation is known as a magma series.

7. 1980 eruption of Mount St. Helens - Wikipedia

   en.wikipedia.org/wiki/1980_eruption_of_Mount_St...

   On March 27, 1980, a series of volcanic explosions and pyroclastic flows began at Mount St. Helens in Skamania County, Washington, United States. A series of phreatic blasts occurred from the summit and escalated until a major explosive eruption took place on May 18, 1980, at 8:32 am. The eruption, which had a volcanic explosivity index of 5 ...

8. These comfy capris are 'loose fitting without being frumpy ...

   www.aol.com/lifestyle/these-comfy-capris-are...

   These comfy capris are 'loose fitting without being frumpy' and now just $18 for Labor Day. Rachel Roszmann. August 31, 2024 at 8:23 AM. The calendar says we are on the cusp of fall, but the ...

9. Convergent boundary - Wikipedia

   en.wikipedia.org/wiki/Convergent_boundary

   Convergent boundary. A convergent boundary (also known as a destructive boundary) is an area on Earth where two or more lithospheric plates collide. One plate eventually slides beneath the other, a process known as subduction. The subduction zone can be defined by a plane where many earthquakes occur, called the Wadati–Benioff zone. [1]