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Latest Petrology Stories

Pebbles, Sand In Martian River Network Show Signs Of Ancient Water
2013-06-05 09:19:44

April Flowers for redOrbit.com - Your Universe Online The most convincing evidence yet that the frigid deserts of Mars were once a habitable environment crossed by flowing water are presented by pebbles and sand scattered near an ancient Martian river network. The findings of this study, led by scientists at NASA´s Mars Science Laboratory mission, were published in the journal Science. The research team says that the discovery of sand grains and small stones that bear the telltale...

Moon Dust Discovered In California Lab
2013-05-27 04:18:11

redOrbit Staff & Wire Reports - Your Universe Online Roughly four decades after mysteriously disappearing, vials of Moon dust collected by Apollo 11 astronauts Neil Armstrong and Buzz Aldrin have been discovered at the Lawrence Berkeley National Laboratory in California. Twenty vials containing handwritten labels dated “24 July 1970” were discovered earlier this month by a local archivist named Karen Nelson, according to Slashgear´s Cory Gunther. As it turns out,...

Scientists Uncover Link Between Lavas Erupting On Sea Floor And Deep-carbon Cycle
2013-05-03 08:05:27

Smithsonian Scientists from the Smithsonian and the University of Rhode Island have found unsuspected linkages between the oxidation state of iron in volcanic rocks and variations in the chemistry of the deep Earth. Not only do the trends run counter to predictions from recent decades of study, they belie a role for carbon circulating in the deep Earth. The team's research was published May 2 in Science Express. Elizabeth Cottrell, lead author and research geologist at the Smithsonian's...

Seas Of Molten Rock Created By Lunar Impacts
2013-03-12 04:54:36

April Flowers for redOrbit.com - Your Universe Online An ocean of molten rock covered the entire lunar surface during the early part of the Moon's history. Over millions of years, that magma ocean cooled, differentiating to form the crust and mantle. According to new analysis of NASA's Lunar Orbiter Laser Altimeter (LOLA) data, led by Brown University planetary scientists, this wasn't the last time the Moon's surface melted on such a massive scale. Graduate student William Vaughan led...

2013-03-11 23:01:03

The Sedimentary Geology Laboratory (LAGESED) of UFRJ, coordinated by Prof. Dr. Leonardo Borghi, acquired the updated versions of Petroledge and RockViewer systems for petrographic knowledge management of carbonate and siliciclastic rocks. Rio de Janeiro, RJ (PRWEB) March 11, 2013 The Sedimentary Geology Laboratory (LAGESED) of UFRJ, coordinated by Prof. Dr. Leonardo Borghi, acquired the updated versions of Petroledge and RockViewer systems for petrographic knowledge management of carbonate...

Mercury May Have Hosted A Magma Ocean In Its Past
2013-02-21 13:29:25

Lee Rannals for redOrbit.com - Your Universe Online Scientists analyzing data from NASA's MESSENGER spacecraft say that Mercury once harbored an ancient magma ocean. An MIT team of scientists say that Mercury may have had a large ocean of magma very early in its history, shortly after its formation about 4.5 billion years ago. A group of scientists analyzed X-ray fluorescence data from MESSENGER collected back in 2011. They were able to identify two distinct compositions of rocks on...

Traces Of Water Found In Apollo 15 Lunar Sample
2013-02-18 14:39:05

Lee Rannals for redOrbit.com — Your Universe Online University of Michigan scientists have found traces of water from a lunar sample brought back during the Apollo 15 mission. The lunar sample, known as "Genesis Rock," was thought to be a piece of the moon's primordial crust, and researchers writing in Nature Geoscience are now reporting they have found traces of water in the rock. The traces of water were detected within the crystalline structure of mineral samples taken from...


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
jument
  • A beast of burden; also, a beast in general.
'Jument' ultimately comes from the Latin 'jugum,' yoke.
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