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Volcano > Dacite
The following information is about Dacite.
Dacite Defined
Dacite lava is most often light gray, but can be dark gray to black. Dacite lava consists of about 63 to 68 percent silica (SiO2). Common minerals include plagioclase feldspar, pyroxene, and amphibole. Dacite generally erupts at temperatures between 800 and 1000° C. It is one of the most common rock types associated with enormous Plinian-style eruptions. When relatively gas-poor dacite erupts onto a volcano's surface, it typically forms thick rounded lava flow in the shape of a dome. (USGS/VHP)
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Off-site Dacite Links, User Submitted
The following links have been collected through user bookmark submission in the Dacite category. Please note, because these resources are off-site we cannot guarantee the accuracy or quality of any information.
Wed Dec 24
- EARTH Magazine: AGU: Aloha, magma! Geothermal engineers drill into surprising lava: SAN FRANCISCO ? While drilling deep into Earth, geothermal engineers struck geological gold, opening a never-before-s een window into a classic geologic process: how basalt magma becomes granite. The find, they announced at the annual meeting of the American Geophysical Union on Tuesday, could amount to the first magma observatory on Earth. - ?If we had hit molten basalt it would not be a big surprise,? Teplow said. But the magma they encountered wasn?t basalt.
Wed Dec 17
- BBC NEWS | Science & Environment | Drillers break into magma chamber: "This is unprecedented; this is the first time a magma has been found in its natural habitat," [...] the drillers were shocked - not only to hit magma but to also hit such a big heat source at the relatively shallow depth of 2.5km. [...] The breakthrough was made in 2005. Only now are researchers confident enough about their work to discuss the details publicly.
Mon Jun 2
- Untitled Document: Whereas basalt forms a'a and pahoehoe surface forms, andesite generally produces blocky lava. Here, the surface contains smooth-sided, angular fragments (blocks) that are not as splintery or vesicular as a'a lava fragments.
Wed Nov 21
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Off-site Dacite Research Links
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