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2009-07-10 06:30:00

TORONTO, July 10 /PRNewswire-FirstCall/ - Wallbridge Mining Company Limited (TSX: WM, FWB: WC7) announced today that a large Induced Polarization chargeability anomaly has been defined on its Rogers Creek porphyry copper-gold-molybdenum property in SW British Columbia. The anomaly covers a north-south distance of at least 400 metres and is approximately 1000 metres wide. Its top is between 100-200 metres below surface and it extends to depth. The response is typical of porphyry style...

2009-06-25 12:46:55

U.S. archaeologists are using obsidian flakes left from the carving of tools to answer many questions about early human beings. University of Washington and Smithsonian Institute archaeologists used X-ray fluorescence spectrometers to determine the origin of 131 flakes of obsidian, a volcanic glass, found at 18 sites on eight islands in the Kurils. The flakes were found with other artifacts and dated to 2,500 to 750 years ago. The Kuril Archipelago stretches nearly 800 miles between the...

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2009-06-18 12:30:00

A top Australian expert warned that Indonesia's devastating 'mud volcano' could keep spewing for the next 30 years, filling the equivalent of 50 Olympic-size swimming pools every day, AFP reported. Dr. Mark Tingay of Curtin University of Technology visited the disaster site in East Java and said about 100,000 people remained under threat from subsidence three years after the volcano first erupted. The Geological Society of Australia reported that the whole region around the vent hole is...

2009-06-18 09:10:49

U.S. scientists have used a supercomputer to calculate the iron isotope distribution in Earth's mantle that occurred 4.5 billion years ago. University of California-Davis geochemists said they simulated the conditions that would have existed when the Earth crystallized from an ocean of magma to its solid form, producing the first picture of how different isotopes of iron were initially distributed in the solid Earth. The scientists said their research could result in a wave of investigations...

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2009-06-08 07:30:00

Billions of years of history have been uncovered with a new technique that is helping scientists paint a picture of how Earth's continents were arranged. Scientists are using the new method to recover rare minerals from rocks and analyze their composition. In addition, researchers claim they can accurately date ancient volcanic rocks for the first time. The early landmasses can be pieced together by aligning rocks that have a similar age and orientation. Scientists say the new approach will...

2009-05-11 16:58:59

U.S. and French scientists say they have discovered the origin of carbon-based lavas erupting from a Tanzanian volcano. The researchers, led by the University of New Mexico, analyzed gas samples collected from inside the active crater of Tanzania's Oldoinyo Lengai volcano -- the only volcano that is actively producing carbon-based lavas. The geochemical analyses revealed a very small degree of partial melting of minerals in the Earth's upper mantle is the source of the rare carbon-derived...

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2009-05-07 08:38:46

Carbon dioxide completely "disappears" into the atmosphere at all other volcanoes on Earth Science has unearthed the secret to what might have been alchemy at Oldoinyo Lengai volcano in Tanzania. There, in the ancient East African Rift at a place known to local Maasai people as the Mountain of God, Oldoinyo Lengai spews forth carbon dioxide-laden lavas called carbonatites. The carbonatites line the volcano's flanks like snowballs. Oldoinyo Lengai is the only place on Earth where carbonatites...

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...

2009-04-08 15:10:46

U.S. scientists say they've completed the first study of microbes living in deep sea volcanoes, where conditions may resemble extraterrestrial environments. The Gulf of Mexico study was led by Professor Samantha Joye of the University of Georgia. The scientists collected fluid samples from the crater of an active mud volcano and from a brine pool that was previously a mud volcano. The researchers said those types of ecosystems are particularly hostile to much of life because they are void of...


Latest 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_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...

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...

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Word of the Day
sough
  • A murmuring sound; a rushing or whistling sound, like that of the wind; a deep sigh.
  • A gentle breeze; a waft; a breath.
  • Any rumor that engages general attention.
  • A cant or whining mode of speaking, especially in preaching or praying; the chant or recitative characteristic of the old Presbyterians in Scotland.
  • To make a rushing, whistling, or sighing sound; emit a hollow murmur; murmur or sigh like the wind.
  • To breathe in or as in sleep.
  • To utter in a whining or monotonous tone.
According to the OED, from the 16th century, this word is 'almost exclusively Scots and northern dialect until adopted in general literary use in the 19th.'
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