* Astronomy

Members Login
Post Info TOPIC: Antarctic Search for Meteorites


L

Posts: 131433
Date:
RE: Antarctic Search for Meteorites
Permalink  
 




__________________


L

Posts: 131433
Date:
GRA06128 and GRA06129
Permalink  
 


Title:  GRA06129: A meteorite from a new asteroidal geochemical reservoir or Venus?
Authors: C.K. Shearer, J.J. Papike, P.V. Burger

Achondritic meteorites commonly represent remnants of magmatic systems from differentiated planets (e.g. Moon, Mars) or asteroids (e.g. HED, acapulcoites, lodranites). They may represent products of early whole planetary melting such as the lunar ferroan anorthosites, remnants of low degrees of melting such as the acapulcoites and lodranites, or episodes of mantle melting such as the mare basalts and shergottites. Newly discovered achondritic meteorites GRA06128 and 06129 do not appear to fit within the planetary or petrologic context of any of these other achondrites. Preliminary oxygen isotopic compositions of these two meteorites lie along the terrestrial fractionation line. The initial description of a lithology with high content of sodic plagioclase and fairly Fe-rich silicates implied a fairly "evolved" planetary lithology compared to HED, lunar, and martian basaltic lithologies. Here, we summarise the preliminary findings of our consortium that has applied a wide range of analytical techniques to help decipher the petrogenesis and origin of this unusual meteorite.

Read more (PDF)

__________________


L

Posts: 131433
Date:
RE: Antarctic Search for Meteorites
Permalink  
 


Two rocks found together in Antarctica are chunks of a dwarf planet that was smashed apart early in the solar system's history, detailed studies suggest. Other remnants of the proto-world may still be floating around in the asteroid belt, and might be identifiable by the spectrum of the sunlight they reflect.
In the solar system's first few tens of millions of years, collisions between rocky objects and the decay of radioactive isotopes melted the interiors of large objects. Magma oceans perhaps hundreds of kilometres deep lapped over the Moon, the Earth, and other large bodies, allowing dense material to settle towards their centres in a process called differentiation.
The two meteorite pieces, called GRA 06128 and GRA 06129 after the Graves Nunataks area of Antarctica where they were found together in 2006, show evidence of such differentiation which suggests they came from a massive body

Read more

__________________


L

Posts: 131433
Date:
Permalink  
 

A pair of mysterious meteorites discovered in Antarctica is baffling scientists who are struggling to determine the origin of the space rocks.
The meteorites, dubbed GRA 06128 and GRA 06129, were found in the Graves Nunataks region of Antarctica in 2006.
The rocks were oddly rusty and salty and smelled like rotten eggs, its discoverers said.
Initially, a team at the University of New Mexico (UNM) caused a stir when its analysis hinted that the pair may hail from Venus or the moon.

Read more 

__________________


L

Posts: 131433
Date:
Permalink  
 



__________________


L

Posts: 131433
Date:
Antarctic Meteorites
Permalink  
 




__________________


L

Posts: 131433
Date:
Antarctic Search for Meteorites
Permalink  
 


Korean Polar Explorers Find Massive Meteorite
A team of Korean scientists in Antarctica has discovered a large meteorite weighing 3.7 kg.
The Korea Polar Research Institute under the Korea Ocean Research and Development Institute said Monday that the country's second exploration team to Antarctica discovered 13 meteorites in the western Thiel Mountains on Dec. 24, 29 and 30.
Last year, the country's first exploration team to the southern continent found five meteorites, but they weighed only between 200 and 400 g.

Read more

__________________


L

Posts: 131433
Date:
Permalink  
 

Donald Pettit, a NASA astronaut, will talk about the "Antarctic Search for Meteorites: Some Observations Relevant to Long-Duration Space Flights" at the James A. Baker III Institute for Public Policy Oct. 26. The lecture begins at 6 p.m. and will be followed by a reception.
Pettit joined the Antarctic Search for Meteorites (ANSMET) last year, spending six weeks in the Antarctic summer collecting meteorite samples. Antarctica is a unique collecting ground for the recovery of large numbers of meteorites. Scientists have determined that meteorites striking the vast ice sheet are better preserved there than anywhere else in the world.
Pettit served as science officer aboard the International Space Station on Expedition 6, which lasted almost six months in 2002-2003. Pettit spent 161 days in space and took part in more than 13 space walks as the mission's science officer. He went to the International Space Station (ISS) aboard the Shuttle Endeavour and returned to Earth on the Soyuz TMA-1.
Pettit used his free time, usually Saturday mornings, while living aboard the ISS to shed light on a variety of subjects for Earth-bound students of all ages. These demonstrations were chronicled and dubbed "Saturday Morning Science."
Pettit graduated from Oregon State University in 1978 and received a doctorate in chemical engineering from the University of Arizona in 1983. He served as a staff scientist at Los Alamos National Laboratory from 1984 to 1996, when he was selected by NASA to be an astronaut.
The event will be held in James A. Baker III Halls Kelly International Conference Facility on the Rice University campus

Source

__________________


L

Posts: 131433
Date:
Permalink  
 

The Korea Polar Research Institute said yesterday it will embark on a two-month field investigation in Antarctica to look for a site to establish a second Korean station. It plans to complete the construction of the new station by 2012.
KOPRI, which is affiliated to the Ministry of Maritime Affairs and Fisheries, said two of its researchers will on the Russian research ship Academic Fedorov around the eastern Antarctic starting Feb. 7.
The two researchers - Kim Dong-yup and Chung Kyong-ho - will visit Russia's five stations in the Antarctic to see how they operate, and collect information to be applied to the running of Korea's second station, KOPRI said.

Read more

__________________


L

Posts: 131433
Date:
Permalink  
 

A team of South Korean researchers has discovered five meteorites in the Antarctic, a state institute said Friday, the first such discovery by Koreans of the space rocks that often contain crucial information of the origins of earth and the universe.

Source

__________________
«First  <  1 2 3 4 5  >  Last»  | Page of 5  sorted by
Quick Reply

Please log in to post quick replies.



Create your own FREE Forum
Report Abuse
Powered by ActiveBoard