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Latest Metamorphic petrology Stories

2012-02-28 11:52:53

The March GSA TODAY, the Geological Society of America´s open-access science and news magazine, is now online at http://www.geosociety.org/gsatoday/archive/22/3/. This month´s science article, by Todd LaMaskin of the University of North Carolina at Wilmington, presents uranium-lead dating analyses of detrital zircon grains in Paleozoic-Mesozoic basin sediments in the Cordillera of western North America. LaMaskin's analysis shows a systematic variation in age distribution within...

2012-01-13 08:00:00

The biological and geographical website EurekaMag.com publishes reviews of specific subjects of all areas of biological and geographical science. The latest insights cover Homo sapiens which are the only living species in the Homo genus, originated in Africa about 200,000 years ago and reaching full behavioral modernity around 50,000 years ago. The latest review is about the three main rock types Igneous Rocks, Metamorphic Rocks and Sedimentary Rocks. Mannheim, Germany (PRWEB) January 13,...

2011-05-18 16:07:56

Carbon found within ancient rocks has played a crucial role developing a time line for the emergence of biological life on the planet billions of years ago. But applying cutting-edge technology to samples of ancient rocks from northern Canada has revealed the carbon-based minerals may be much younger than the rock they inhabit, a team of researchers report in the latest edition of the journal Nature Geoscience. The team "“ which includes researchers from Boston College, the Carnegie...

2009-04-23 09:55:00

NEW YORK, April 23 /PRNewswire/ -- Crystal Research Associates, LLC announced today that it has issued an Executive Informational Overview(R) (EIO(R)) on Visible Gold Mines Inc. (TSX: VGD). The full 52-page report can be found at www.crystalra.com. Visible Gold Mines Inc. ("Visible Gold Mines" or "the Company") is a mining exploration company focused on gold mineral prospects in the Abitibi greenstone belt of Quebec, Canada. A greenstone belt is a zone of metamorphosed volcanic and...

2008-11-05 09:00:21

MISSISSAUGA, Ontario, Nov. 5, 2008 (GLOBE NEWSWIRE) -- AllPennyStocks.com Media, Inc. (http://www.AllPennyStocks.com), a leading penny stock / small-cap information site, released its latest spotlight company Lake Victoria Mining Company Inc. (OTCBB:LVCA). Lake Victoria Mining Company, Inc. is working to create another gold mine in the world famous Lake Victoria Greenstone Belt Tanzania, East Africa. Tanzania produced 1.75 million troy ounces of gold during 2007 and is the 3rd largest gold...

2008-09-11 18:00:27

TORONTO, ONTARIO--(Marketwire - Sept. 11, 2008) - ECU Silver Mining (TSX:ECU) - Dear fellow Shareholders, Needless to say the past 14 months and particularly the last 2 months have been very turbulent times for the mining sector and the capital markets in general. Due to the most recent, and still ongoing, severe correction we are experiencing in the equity markets, we felt it important to update our shareholders on our key exploration strategy. In particular, the purpose of this letter...

2008-07-29 12:01:02

Aura Silver Resources Inc. (TSX VENTURE: AUU) (the "Company" or "Aura Silver") is pleased to announce Fugro Airborne Surveys is currently flying a GEOTEM(R) survey over the recently staked Greyhound Claim Group located in Nunavut, just north of the Hamlet of Baker Lake. Newly recorded claims, staked in the spring of 2008 more than double Aura's Greyhound land package (now totaling 23,000 hectares). The claims cover a relatively unexplored Archean greenstone belt and are wholly-owned by Aura...

2008-03-05 14:26:56

Earth scientists are in the business of backing into history -- extrapolating what happened millions of years ago based on what they can observe now. Using this method, a team of Cornell researchers has created a mathematical computer model of the formation of granulite, a fine-grained metamorphic rock, in the Earth's crust. By studying what were once pockets of hot, melted rock 13 kilometers (about 8 miles) deep in the Earth's crust 55 million years ago and calculating the period of...


Latest Metamorphic petrology Reference Libraries

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_7ea4778c81fd8cde7aa462546b2ebb04
2005-05-26 10:50:45

Gneiss is a common and widely distributed type of rock formed by high grade regional metamorphic processes from preexisting formations that were originally either igneous or sedimentary rocks. Gneissic rocks are coarsely laminated and largely recrystallized but do not carry large quantities of micas, chlorite or other platy minerals. Gneisses that are metamorphosed igneous rocks or their equivalent are termed granite gneisses, diorite gneisses, etc. However, depending on their composition,...

28_8002f27f8f96dedfc5d591fb18ec14b5
2005-05-26 09:41:33

The mineral kyanite is an aluminium silicate of the sillimanite group (along with andalusite and sillimanite), also called alumino-silicate. It has the formula Al2O3·SiO2 (Al2SiO5). Its hardness varies widely depending on its crystallographic direction, from 5 to 7.5, and it has a specific gravity of 3.56-3.67. It is translucent, usually blue, but possibly white, gray, green, or black. It is usually found in long-bladed crystals or columnar to fibrous structures. Kyanite is used in...

28_8dfc279b72b521e3de456cec90868ef0
2005-05-26 08:52:39

Marble is metamorphosed limestone, composed of fairly pure calcite (a crystalline form of calcium carbonate, CaCO3). It is extensively used for sculpture, as a building material, and in many other applications. Faux marble or faux marbling is a wall painting technique that imitates the color patterns of real marble (not to be confused with paper marbling). Marble dust can be combined with cement or synthetic resins to make reconstituted or cultured marble. Places named after the stone...

28_bafab74b664712f5e51fccb0464d696e
2005-05-26 08:35:42

Muscovite, also known as potash mica, is a phyllosilicate mineral of aluminium and potassium. It has a highly perfect basal cleavage yielding remarkably thin laminae (sheets), which are often highly elastic. Muscovite has a hardness of 2 - 2.25 and a specific gravity of 2.76 - 3. It can be colorless or tinted through grays, browns, greens, yellows, or rarely violet or red, and can be transparent or translucent. The green form is called Fuchsite, KAl2(AlSi3O10)(F,OH)2. Muscovite is the most...

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Word of the Day
cacodemon
  • An evil spirit; a devil.
  • A nightmare.
  • In astrology, the twelfth house of a scheme or figure of the heavens: so called from its signifying dreadful things, such as secret enemies, great losses, imprisonment, etc.
'Cacodemon' comes from a Greek term meaning 'evil genius.'
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