Latest Dacite Stories
A new study has found that a mixing of two different types of magma is the key to the historic eruptions of Mount Hood, Oregonâ€™s tallest mountain, and that eruptions often happen in a relatively short time â€“ weeks or months â€“ after this mixing occurs.
Geologists say an undisturbed chamber of molten rock in Hawaii is offering new insight into the way continental rock is formed. The magma, discovered in 2005 when a geothermal power company drilled a mile and a half deep on one of the islands, is the first contact scientists have had with the molten rock from anywhere other than a volcano, The Washington Post reported Thursday. This is Jurassic Park.
STEWART, BC, Aug. 11 /PRNewswire-FirstCall/ -- Mountain Boy Minerals Ltd announces that drilling has started on its 100 % owned BA claims. The BA claims are located 30 km east of Stewart in the Skeena mining division approximately 3 kilometers south of paved Highway 37A.
International Kirkland Minerals Inc. ("IKI" / the "Company") (TSX VENTURE: IKI) announces the private placement unit offering announced on June 17, 2008 consisting of 2,000,000 units at $0.12 per unit has closed.
Mars is a rocky planet with an ancient volcanic past, but new findings show the planet is more complex and active than previously believed -- at least in certain places. Finding those places, however, turns out to be trickier than just looking at landforms like river valleys or lakebeds or searching for specific minerals.
Using data from the Thermal Emission Spectrometer on Mars Global Surveyor and the Thermal Emission Imaging System on Mars Odyssey, ASU planetary geologists have found evolved igneous rocks -- including andecite, daceite and granite -- in localized areas on Mars, indicating that the planet has remained geologically active through much of its history.
Rhyolite is an igneous, volcanic (extrusive) rock, of felsic composition, with aphanitic to porphyritic texture. Mineral assembly is usually quartz, alkali feldspar and plagioclase (in a ratio > 1:2). Biotite and pyroxene are common accessory minerals. Rhyolite can be considered as the extrusive equivalent to the plutonic granite rock. Due to their high content of silica, rhyolite form highly viscous lavas. They can also occur as breccias or in volcanic necks and dikes. Like obsidian,...
- In dressmaking, straps running from the belt in front over the shoulders to the belt in the back, with more or less elaboration of trimming and outline. They usually broaden at the shoulder and narrow toward the waist.