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carbonaceous chondrite Although fewer than 100 carbonaceous chondrites are known, accounting for only about 5% of chondrite falls, they provide a great deal of information about the origin of the Sun and planets, and even of life itself (see organic matter, in meteorites). Carbonaceous chondrites are the most primitive and unaltered type of meteorite known, with an elemental composition probably similar to that of the nebula from which the Solar System formed. Different groups of carbonaceous chondrites have been identified that came from parent bodies in different parts of the solar nebula. www.daviddarling.info /encyclopedia/C/carbchon.html   (1185 words)

Meteorite.fr - Classification - Stony Meteorites - Carbonaceous Chondrites Carbonaceous chondrites or C chondrites represent some of the most pristine matter known, and their chemical compositions match the chemistry of the Sun more closely than any other class of chondrites. Carbonaceous chondrites are primitive and undifferentiated meteorites that formed in oxygen-rich regions of the early solar system so that most of the metal is not found in its free form but as silicates, oxides, or sulfides. Chondrites of the CI group are named for their type specimen Ivuna, which fell in Tanzania in 1938, and there are only a handful of those rare meteorites known. www.meteorite.fr /en/classification/carbonaceous.htm   (2962 words)

The Meteorite Catalogue Database at the Natural History Museum Chondrites are stony meteorites that have not melted since their aggregation early in the history of the Solar System. Chondrites, then, are composed of high temperature components (CAIs, chondrules) set in a matrix of fragmented chondrules mixed with sulphides, metal and minerals formed at lower temperatures (clay minerals, carbonates, sulphates, organic matter). Chondrites are sub-divided on the basis of chemistry, matrix, metal and chondrule contents and chondrule properties (size, type, etc.). www.nhm.ac.uk /jdsml/research-curation/projects/metcat/bgchondrites.dsml   (683 words)

APPENDIX VI Carbonaceous chondrites have a ratio of 1.00-1.35 (CV = 1.33, CK = 1.11-1.33, CO,CM = 1.11, CR = 1.00), R chondrites 0.85, ordinary chondrites 0.77-0.82, and enstatite chondrites ~0.6. Carbonaceous chondrites have a ratio of ~0.5-5.0 vol%, ordinary chondrites have a negligible amount, enstatite chondrites a negligible amount, and R chondrites essentially none. Carbonaceous chondrites have a ratio of 0.6-0.9, ordinary chondrites 0.9-1.1, enstatite chondrites 1.0-1.2, and R chondrites 1.5 ±0.2. www.meteoritestudies.com /protected_append6.htm   (1487 words)

CO3, CR, CM, CV, CK, CI, CH, carbonaceous chondrites Carbonaceous chondrites are a rare kind of meteorite that contain organic compounds such as amino acids and kerogin, an organic matter often found in coal and shale. Carbonaceous chondrites represent some of the most primitive of all meteorites, with solar major element composition (Fe, Si, Mg, Ca, Al). CH chondrites are characterized by a FeNi-metal-rich nature and a general paucity of matrix around the chondrules. www.saharamet.com /meteorite/gallery/Ctypes/CAIs.html   (417 words)

NAI: News Stories   (Site not responding. Last check: ) Carbonaceous chondrite meteorites contain vital clues to the evolution of carbon compounds in our solar system preceding the origin of life. Scientists have conducted an organic analysis of the Tagish Lake meteorite, a rare, carbon-rich meteorite classified as a carbonaceous chondrite. For example, the Murchison meteorite, a carbonaceous chondrite found in Australia in 1969, contains numerous amino acids and a variety of other organic compounds that are the building blocks for life. nai.arc.nasa.gov /news_stories/news_detail.cfm?ID=233   (894 words)

ANSMET - Antarctic Search For Meteorites Expedition 2001 Chondrites (and in particular the carbonaceous chondrites) have a bulk chemistry similar to that of the sun, and are all very old, the oldest objects known in the solar system. An example of this is the L/LL chondrites whose characteristics are intermediate to those of previously defined L and LL groups, suggesting a relatively smooth variation in nebular conditions and materials instead of discrete and distinct nebular zones. As already noted, chondritic meteorites are thought to represent samples of the solar nebula, and are carefully studied to help understand the kinds of materials and conditions that were present at the beginning. www.webexpeditions.net /ansmet/science.php   (2070 words)

Space Studies Board The properties of carbonaceous chondrites suggest that the diameters of their parent objects are on the order of 100 km, but significantly larger objects cannot be ruled out. After all, the ordinary chondrites come from some main-belt asteroids, even if they are rare, and the mineralogy that the ordinary chondrites have in common imposes quite firm constraints on their prebiotic chemical history. Numerous carbonaceous chondrites have been found to contain organic compounds, some of which were apparently synthesized directly on the parent body during a period when aqueous conditions existed (Cronin and Chang, 1992). www7.nationalacademies.org /ssb/sssbch4.html   (6530 words)

Meteorite Chondrites are typically about 4.6 billion years old and are thought to represent material from the asteroid belt. Carbonaceous chondrites, thought to be unaltered solar nebula material, constitute about 5% of meteorites and contain small amounts of organic materials, including amino acids. The isotope ratios of carbonaceous chondrites are similar to those of the Sun. www.skygazer.se /theamazingsky/Meteorite.htm   (670 words)

[No title] Carbonaceous (C) chondrites are some of the most complex of all meteorites. Carbonaceous chondrites are the only meteorites known with petrologic grades 1 and 2. Two carbonaceous chondrites, Allende and Murchison, are of particular interest to scientists and, curiously, both fell in 1969, but on opposite sides of the world. www.meteorlab.com /METEORLAB2001dev/carbchon.htm   (289 words)

Glossary for Planetary Science Research Discoveries | PSRD Chondrites come from asteroids that did not melt when formed and are designated as H, L, LL, E, or C depending on chemical compositions. For example, the CI group of carbonaceous chondrites are closest in composition to the photosphere (visible surface) of the Sun. Primitive meteorite: A primitive meteorite is a chondrite that experienced minimal heating and aqueous alteration on its parent asteroid. www.psrd.hawaii.edu /PSRDglossary.html   (8957 words)

asterres1b All members of the C1 subtype of carbonaceous chondrites are very easily crushed; so are the members of the C2 subtype. All the E chondrites are in a state of extraordinary chemical reduction. However, more than 95 percent of the chondrites that fall on Earth (about 3/4 of all known meteorites) lie between the extremes represented by the E and C chondrites. www.nss.org /settlement/nasa/spaceresvol3/asterres1b.htm   (439 words)

www.meteorites.com classification Within each of these groups, chondrites are also classified according to their petrologic type; that is, on the basis of the degree of alteration (or alteration grade) to which they have been subjected on their parent body prior to arriving on Earth. Carbonaceous chondrites have mostly undergone aqueous alteration (none are of grade higher than 4), while most ordinary and enstatite chondrites have undergone thermal metamorphism (none are of grade lower than 3). H chondrites may be identified by the fact that their matrix displays abundant iron flakes and facets, which are often oxidized. www.meteorites.com /classif.html   (3318 words)

Geokem - Meteorites Also shown is the standard Chondrite by Sun and McDonnough,(1989) and the almost identical CI chondrites of Palme and Beer,(1993) and of Anders and Grevesse (1989) which the latter have later claimed to be almost identical to the composition of the Sun's outer corona. Chondrite Zr/Nb of 15 is equivalent to a terrestrial OIB tholeiite, but contrasts with depleted NMORB which are high degree partial melts with Zr/Nb, of 25 to 100 or more. It happens that the average chondrite is intermediate between these two minerals in it's major elements, this is pure chance and happens because of the relative stability of these elements in the sun's photosphere, which results in a similar Si-Mg-Fe ratio. www.geokem.com /meteorites.html   (4923 words)

jefalls The CM carbonaceous chondrites are named for their close similarities to the Mighei meteorite which fell on 18 June 1889 [See the entry for June 18th]. A number of the CM carbonaceous chondrites contain amino acids and other moderately complex organic acids, demonstrating that the chemical building blocks of life may be produced by natural processes operating outside the earth. The CK carbonaceous chondrites are named for their similarities to the Karoonda meteorite, the original CK meteorite, which fell in Australia on 25 November 1930. www1.broward.edu /~lhill/jefalls.html   (2848 words)

Chondrites 85% of the falls are ordinary chondrites, you might think that these meteorites are really common. The chondrites form a group of 50 tons, they are 6 times more rare than iron meteorites and carry valuable information about our earliest system history. The most important minerals in chondrites are olivine and pyroxene. www.saharamet.com /meteorite/gallery/chondrite   (472 words)

Philip Bland, Meteor Man - - science news articles online technology magazine articles Philip Bland, Meteor Man   (Site not responding. Last check: ) On the one hand, carbonaceous chondrites have roughly the same chemical makeup as the sun, which suggests they are pure remnants of that ancient nebula locked in a rock. Try, for example, to follow these three statements: One, the 30 or so carbonaceous chondrite meteorites well-preserved enough to be worth studying may not be identical, but they all have roughly the same chemical composition— the same chemical elements in the same proportions— as our sun. Three, carbonaceous chondrites are therefore pure nebular material (syllogism: If the sun and the nebula are the same, and the sun and the meteorites are the same, the meteorites and the nebula must be the same). www.discover.com /issues/mar-01/features/featbland   (2874 words)

SPACE.com -- Rare Canadian Meteorite Tagged as First of Its Kind Found on Earth This D asteroid probably originated in the mid-to-far end of the Main Belt between Mars and Jupiter, and it is thought to contain the oldest raw ingredients that came to comprise the solar system. Scientists quickly started analyzing samples from the rock, as well, and announced last year that it was a carbonaceous chondrite from the Main Belt. D asteroids, like some of the other carbonaceous chondrites, usually reflect about only 4 percent of the sunlight that hits them. www.space.com /scienceastronomy/solarsystem/rare_meteorite_010824.html   (874 words)

Arthur Ross Hall of Meteorites | American Museum of Natural History Farmington belongs to a group (ordinary chondrites) that may have formed at an intermediate distance from the Sun. Banten belongs to a group (carbonaceous chondrites) that may have taken shape relatively far from the Sun. It belongs to a group of meteorites (carbonaceous chondrites) that may have formed relatively far from the Sun. www.amnh.org /exhibitions/permanent/meteorites/origins/hotcold.php   (892 words)

Find a Meteorite: Explore Meteorites: Chondrites Most chondrites contain chondrules, which are small, spherical silicate objects on the order of a millimeter or less in size. Scientists are interested in chondrites because their chemical composition reflects that of the solar nebula. Although the surface of Ceres appears to be chondritic, there is evidence that the chondritic material in the upper crust of Ceres may have been altered by water. dawn.jpl.nasa.gov /Meteorite/explore_meteorites_chondrites.asp   (303 words)

Astroecology - a branch of astrobiology - Interactions of microorganisms and plants with solar system soils and ...   (Site not responding. Last check: ) The soil fertility of martian meteorites and simulants and of carbonaceous chondrites is examined in small plant and algal microcosms. The data on Murchison suggest that similar materials in carbonaceous asteroids and cometary nuclei may be able to transport and incubate microorganisms and may be applied as soils in space settlements. Carbonaceous chondrite phyllosillicates and light element geochemistry as indicators of parent body processes and surface conditions. www.astroecology.com /Astrobiology_Paper.htm   (7506 words)

Carbonaceous Chondrite   (Site not responding. Last check: ) Carbonaceous chondrite is any stony meteorite or asteroid containing material associated with life (e.g., hydrocarbons, amino acids, and forms resembling microscopic fossils) and for which some researchers have postulated an extraterrestrial biological origin. Instead of containing the anhydrous silicates found in most chondrites, the carbonaceous types have claylike hydrous silicate minerals. Magnesium sulfate is found in narrow veins; and since it is water soluble, carbonaceous chondrites disintegrate rapidly because of weathering. abyss.uoregon.edu /~js/glossary/carbonaceous_chondrite.html   (118 words)

Great Selection of Rocks and Minerals: Mama's Minerals Chondrites are classified as ordinary (85% of the category), carbonaneous, E-chondrites, and R-chondrites. Carbonaceous chondrites generally contain water-bearing minerals, and are so fragile that specimens in good condition are rare — particularly the CI subgroup. The Tagish Lake meteorite which was recovered in early 2000 appears to be a form of CI carbonaceous chondrite. www.mamasminerals.com /lmrhfmeteoritesstony.html   (747 words)

The Montréal Planetarium — What's Up — Meteorites, Messengers from Space Chondrites contain chondrules, which are small silicated spheres, and their heavy element composition is similar to that of the Sun. Carbonaceous chondrites contain a relatively large proportion of carbon, which gives them a dark grey colour. Enstatite chondrites are essentially composed of the mineral from which they get their name. www.planetarium.montreal.qc.ca /Information/Expo_Meteorites/Classes/classes_01_a.html   (264 words)

Carbonaceous Chondrites, C-Chondrite The ther two major chondritic (chondrule-bearing) groups are the ordinary and the enstatite chondrites. The carbonaceous chondrites are broken up into seven subgroups, the Meta-C-Chondrite type, the CI (Ivuna-type), the CK -type, the CM (Murchison-type), CV (Vigarano type), CO (Ornans-type), and the CR (Renazzo-type). Oxygen isotope composition is in the range of metamorphosed CM chondrites (R. Clayton, UChi): d18O = +21.99‰; d17O = +10.85‰; D17O = -0.58‰. www.mars.li /c-chondrite.htm   (931 words)

Allende Meteorite Carbonaceous chondrites are thought to be the most primitive form of matter in the universe. CI carbonaceous chondrites--a somewhat more primitive type--have a composition very close to that of the Sun. Chemical analyses of carbonaceous chondrites have revealed both non-biological and biological amino acids--the buildings blocks of life. www.alaska.net /~meteor/AMinfo.htm   (693 words)

Robert A Haag Private Meteorite Collection - Achondrites   (Site not responding. Last check: ) The group of stone meteorites known as chondrites is broken down into three classifications: ordinary chondrites, including amphoterites (LLs), enstatite chondrites (E chondrites), and carbonaceous chondrites, (C chondrites). They are further classified by a numbering system of 3 through 6: where the lower the number the less the chondrules have changed and the higher the number, the more the condrules have been changed. Carbonaceous chondrites are those that are rich in the element carbon. www.meteoriteman.com /collection/chon.htm   (164 words)

UC Davis Geology: GSA Meeting Abstracts carbonaceous chondrites (CI, CM, CO, CV and CK) and 5 ordinary chondrites (H, L and LL) is 0.3 ‰. As for Zn [2], Cr isotopes seem to be heavier in ordinary chondrites (-0.23 ‰) than in carbonaceous chondrites (-0.35 ‰). Also as for Zn and Cu [2-3], Cr stable isotopes in carbonaceous chondrites are correlated with Δ 17O, suggesting a mixing between an isotopically heavy component and an isotopically light one. www-geology.ucdavis.edu /www/Pubs/agu06/yin3_06.html   (356 words)

Meteorite Classification Page Chondrite meteorites also contain varying amounts of metal, which can be seen as small flakes when the meteorite is cut and sliced. Enstatite Chondrites are composed the silicate enstatite (iron free pyroxene). It is theorized that the E chondrites formed in an oxygen-depleted environment, possibly near Mercury's orbit. imca.repetti.net /metinfo/metclass.html   (837 words)

Carbonaceous Chondrites / CB (bencubinites) If you consider this, they could be easily regarded as true stony-iron meteorites, but their mineralogical and chemical properties clearly put them into the class of the carbonaceous chondrites, or more strictly speaking into the CR clan. Description: The CB chondrites can be easily distinguished from all other meteorite groups due to their high metal content, and they typically show mm-sized metal globules, and often cm-sized chondrules, with the metal globules often distorted by shock or partial melting. Origin and Formation: It is probable that the CB chondrites – like all members of the CR clan – formed under different conditions in the same region of the primordial solar nebula, but it is also possible that they are all part of one and the same parent body. www.meteorites.tv /contents/en-us/d111.html   (420 words)

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