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Latest Petrology Stories

2011-11-16 08:00:00

Adya Inc., a Coldwater, Michigan company providing mineral waters with extraordinary properties, has a new website, found at adyaclarity.com. It is chalk full of information as regards the product, its production, and recommended usage. Pleasant Lake, MI (PRWEB) November 16, 2011 Adya Inc., a Coldwater, Michigan company providing mineral waters with extraordinary properties, has a new website, found at adyaclarity.com. It is chalk full of information as regards the product, its...

Geologists Assess Deep Impacts Of Near-Earth Object Strikes
2011-10-18 08:03:44

Volcanologists from the Universities of Leicester and Durham have forensically reconstructed the impact of a meteorite on Earth and how debris was hurled from the crater to devastate the surrounding region. New research by Mike Branney, of the University of Leicester's Department of Geology, and Richard Brown, University of Durham, shows that some aspects of giant meteorite impacts onto Earth may mimic the behavior of large volcanic eruptions. Meteorite impacts are more common than is...

The Cause Of Earth's Largest Environmental Catastrophe
2011-09-15 08:14:44

  Siberian traps and their relation to the mass extinction 250 million years ago The eruption of giant masses of magma in Siberia 250 million years ago led to the Permo-Triassic mass extinction when more than 90 % of all species became extinct. An international team including geodynamic modelers from the GFZ German Research Centre for Geosciences together with geochemists from the J. Fourier University of Grenoble, the Max Plank Institute in Mainz, and Vernadsky-, Schmidt- and...

namibia_wet4_h
2011-09-14 18:42:46

Something's up with the weather in Namibia, say geoscientists Kyle Nichols of Skidmore College in Saratoga Springs, N.Y., and Paul Bierman of the University of Vermont in Burlington, Vt. Nichols and Bierman should know. They're just back from the western mountains and coastal plain of this sparsely populated African country. Usually, western Namibia is a dusty place where the stream beds are sand and the "lakes" are nothing more than flats of dried mud. Not now. This year, rivers...

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2011-08-17 13:50:00

According to new research, the Earth's moon could be younger than previously thought. The theory for lunar formation says that a rock known as ferroan anorthosite (FAN) is the oldest of the Moon's crustal rocks, but scientists have had difficulty dating FAN samples. Researchers used newly refined techniques to determine the age of a sample of FAN from the lunar rock collection at the NASA Johnson Space Center. They analyzed isotopes of the elements lead and neodymium to place the FAN...

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2011-08-12 13:30:19

The 2010 ash cloud from Iceland's Eyjafjallajokull volcano that disrupted air travel in the UK and cost European businesses more than $2.6 billion was likely a once in a lifetime event, according to scientists, who have analyzed a record of past similar events stretching back into prehistory across northern Europe. Their analysis showed that past ash clouds like the one seen in 2010 occurred on an average of once every 56 years. A report of the findings has been published in the journal...

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2011-08-11 08:41:57

Sunken oceanic crust resurfaces from Earth's mantle after only 500 million years The recycling of the Earth's crust in volcanoes happens much faster than scientists have previously assumed. Rock of the oceanic crust, which sinks deep into the earth due to the movement of tectonic plates, reemerges through volcanic eruptions after around 500 million years. Researchers from the Max Planck Institute for Chemistry in Mainz obtained this result using volcanic rock samples. Previously, geologists...

2011-08-04 14:38:00

VANCOUVER, Aug. 4, 2011 /PRNewswire/ - Ralph Rushton, the President of Emerick Resources Corp. (TSXV: ERC) is pleased to announce that the Company has negotiated an option to acquire a 75% interest in an extensive claim package in the Northwest Territories controlled by GGL Resources Corp. ("GGL"), subject to TSX Venture Exchange approval. A finder's fee is payable to Axemen Resource Capital Ltd., an Exempt Market Dealer. The Providence Greenstone Belt ("PGB") project covers an...

2011-06-30 17:43:43

Heavy Metal Meets Hard Rock: Battling through the Ocean Crust's Hardest Rocks to Capture the Boundary Between Magma and Water Scientists and drillers recovered a remarkable suite of heat-tempered basalts that provide a detailed picture of the rarely seen boundary between magma and seawater. These samples were collected during a return to ODP Hole 1256D, one of the deepest "hard rock" penetration sites of scientific ocean drilling. ODP Hole 1256D has been stabilized, cleared to its full depth,...


Latest Petrology Reference Libraries

Chaitén
2014-08-28 10:38:21

Chaitén is a volcanic caldera that is located in southern Chile that reaches an elevation of 3,681 feet. It is thought that this volcano once held a rhyolite obsidian lava dome that reached 3,156 in height, but this was destroyed after its most recent eruption in 2008. In the past, this volcano has released grey obsidian, which was used by pre-Columbian cultures to make many objects, some of which have been found 250 miles away from the volcano. Chaitén experienced the beginning of a new...

28_e9750264d5476c85f9be09d17bc6fd51
2005-05-26 12:03:39

Biotite is a common phyllosilicate mineral that contains potassium, magnesium, iron and aluminium. It is sometimes called "iron mica" and is found in granitic rocks, gneisses, and schists. Like other mica minerals, biotite has a highly perfect basal cleavage, its flexible sheets easily flaking off. It has a hardness of 2.5 - 3, a specific gravity of 2.7 - 3.1, is colored greenish to brown or black, and can be transparent to opaque. Biotite is occasionally found in large sheets, especially in...

28_56635877b282726a86b25cf3e98722c2
2005-05-26 11:30:45

Chert is a fine-grained silica-rich cryptocrystalline sedimentary rock that may contain small fossils. It varies greatly in color from white to black, but most often manifests as gray, brown, grayish brown and light green to rusty red; its color is an expression of trace elements present in the rock, and both red and green are most often related to traces of iron (in its oxidized and reduced forms respectively). It outcrops as nodules in limestone, chalk, and dolostone formations as a...

28_42121cee4c09c0898f52263bea588d54
2005-05-26 11:26:59

Chromite, iron magnesium chromium oxide: (Fe,Mg)Cr2O4, is an oxide mineral belonging to the spinel group. Magnesium is always present in variable amounts, also aluminium and iron substitute for chromium. Chromite is found in peridotite and other layered ultramafic intrusive rocks and also found in metamorphic rocks such as serpentinites. Ore deposites of chromite form as early magmatic differentiates. It is commonly associated with olivine, magnetite, serpentine, and corundum. Chromite is...

28_b760796d3dace508242e89fc53d49081
2005-05-26 11:13:08

In geology, a conglomerate is a rock consisting of other stones that have been cemented together. Conglomerates are sedimentary rocks consisting of subangular clasts and are thus differentiated from breccias, which consist of angular clasts. Both conglomerates and breccias are characterized by clasts larger than sand (>2 mm). There are two varieties of conglomerate, defined by texture: paraconglomerates and orthoconglomerates. Paraconglomerates are one of two varieties of conglomerate...

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Word of the Day
vermicular
  • Like a worm in form or movement; vermiform; tortuous or sinuous; also, writhing or wriggling.
  • Like the track or trace of a worm; appearing as if worm-eaten; vermiculate.
  • Marked with fine, close-set, wavy or tortuous lines of color; vermiculated.
  • A form of rusticated masonry which is so wrought as to appear thickly indented with worm-tracks.
This word ultimately comes from the Latin 'vermis,' worm.
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