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Latest Geochemistry Stories

Receding Ice Exposes Seawater To Carbon Dioxide, Driving Ocean Acidification In The Arctic Ocean
2013-09-13 12:12:21

University of South Florida (USF Health) Acidification of the Arctic Ocean is occurring faster than projected according to new findings published in the journal PLoS One. The increase in rate is being blamed on rapidly melting sea ice, a process that may have important consequences for health of the Arctic ecosystem. Ocean acidification is the process by which pH levels of seawater decrease due to greater amounts of carbon dioxide being absorbed by the oceans from the atmosphere....

Surface Mining Environmental Cost
2013-09-12 10:02:17

Brett Smith for redOrbit.com - Your Universe Online To satiate the United States’ fierce appetite for coal, miners often utilize a tactic called surface mining, which involves stripping away rock and topsoil to access the fossil fuel below. According to a new report from researchers from Duke University just published in the journal PLOS ONE, coal retrieved from the Earth through surface mining comes at a significant cost to the ecosystem. Study researcher Brian D. Lutz, currently...

Dark Ocean Carbon Absorption Not Enough To Restrict Global Warming
2013-09-06 07:46:40

April Flowers for redOrbit.com - Your Universe Online A new study led by the University of Iowa shows that although microbes that live below 600 feet where light doesn’t penetrate – the so called “dark ocean”-- might not absorb enough carbon to curtail global warming, they do absorb considerable amounts of carbon, meriting further study. The findings of this study were published in the International Society of Microbial Ecology Journal. While many people are familiar with the...


Latest Geochemistry Reference Libraries

28_0d277ca2b0d8b8cd79fb9cfa322f77e1
2005-05-26 11:01:52

Diorite is a grey to dark grey intermediate intrusive igneous rock composed principally of plagioclase feldspar (typically andesine), hornblende, and/or pyroxene. Varieties deficient in hornblende and other dark minerals are called leucodiorite. It is often described as "salt and pepper" when composed largely of light-colored minerals randomly interspersed with dark minerals. When olivine and more iron-rich augite are present, the rock grades into ferrodiorite, which is transitional to...

28_30e95d7bc9a84ffe78f930c8704eb5b2
2005-05-26 11:00:22

Gabbro is a dark, coarse-grained, intrusive igneous rock chemically equivalent to basalt. It is a plutonic rock, formed when molten magma is trapped beneath the Earth's surface and cools slowly into a hard, coarsely crystalline mass. It is dense, greenish or dark-colored and contains varied percentages of plagioclase feldspar, pyroxene, amphibole, and olivine (called olivine gabbro when olivine is present in large quantities). Quartz gabbros are also known to occur and are probably derived...

28_c04342a5025a8ae7a0de88f6dc83278c
2005-05-25 11:55:01

Syenite is a coarse-grained intrusive igneous rock of the same general composition as granite but with the quartz either absent or present in relatively small amounts. The feldspars are alkaline in character and the dark mineral is usually hornblende. Soda-lime feldspars may be present in small quantities. The term syenite was originally applied to hornblende granite like that of Syene in Egypt, from which the name is derived. Syenite is not a common rock, some of the more important...

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Word of the Day
malpais
  • The ragged surface of a lava-flow.
'Malpais' translates from Spanish as 'bad land.'