Gabbro rock


Such reactions marking the disappearance of plagioclase feldspars may be responsible for the Mohorovicic discontinuity between the earth s crust and mantle this implies that the crust and mantle are isocompositional, the crustal rocks above having phases characteristic of gabbro rock (olivine, pyroxene, plagioclase) whilst the mantle rocks below are an eclogite-containing garnet, Al-rich pyroxene and quartz. Not all geochemists agree, however.  [c.358]

For horizontal flow of fast-settling slurries, the following rough description may be made (Govier and Aziz). Ultrafine particles, 10 [Lm or sm ler, are generally fully syspended and the particle distributions are not influenced by gravity. Fine particles 10 to 100 [Lm (3.3 X 10" to 33 X 10" ft) are usually fully suspended, but gravity causes concentration gradients. Medium-size particles, 100 to 1000 [Lm, may be fully suspended at high velocity, but often form a moving deposit on the bottom of the pipe. Coarse particles, 1,000 to 10,000 jlm, (0.0033 to. 033 ft), are seldom fully suspended and are usually conveyed as a moving deposit. Ultracoarse particles larger than 10,000 [Lm (0.033 ft) are not suspended at normal velocities unless they are unusually light.  [c.656]


See pages that mention the term Gabbro rock : [c.489]    [c.657]    [c.676]    [c.218]    [c.174]    [c.143]   
Chemistry of the elements (1998) -- [ c.358 ]