chondrite


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Related to chondrite: Carbonaceous chondrite

chondrite:

see meteoritemeteorite,
meteor that survives the intense heat of atmospheric friction and reaches the earth's surface. Because of the destructive effects of this friction, only the very largest meteors become meteorites.
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chondrite

(kon -drÿt) A type of stony meteorite that contains chondrules. They are the most abundant class of meteorite in the Solar System (about 86%). Chondrites are largely composed of iron- and magnesium-bearing silicate minerals with a wide range of compositions. Their chemical composition is similar to that of the Sun (but depleted in volatile gases like hydrogen and helium). Several types are recognized: carbonaceous chondrites have the highest proportions of volatile elements and are the most oxidized; enstatite chondrites contain the most refractory elements (withstanding high temperatures) and are reduced; ‘ordinary’ chondrites, the most common type, are intermediate in volatile element abundance and oxidation state. Ordinary chondrites plus some carbonaceous chondrites are thought to be primitive samples of early Solar-System material. See also asteroids. Compare achondrite.

Chondrite

 

the most common type of stony meteorite, accounting for 90 percent of all such meteorites. Chondrites are characterized by the presence of chondrules located in the primary, fine-grained mass of the meteorite (see). They contain a significant amount of nickel-bearing iron in the form of small grains that have the same composition and microstructure as the grains in octahedrites.

chondrite

[′kän‚drīt]
(geology)
A stony meteorite containing chondrules.
References in periodicals archive ?
It also explains the observations of the degree of alteration by strikes which appear in those chondrites which reach Earth," noted Josep Maria Trigo.
The rocks are carbonrich chondrites, ancient fragments of asteroids formed shortly after the birth of the Solar System 5bn years ago.
Our dust samples similarly show a subtle tendency towards relative Zr loss, with an average Zr/Hf slightly lower than chondrite (32.
Analysis of the rock's chemical composition suggests that it may represent a new class of chondrite more primitive than any yet found.
REE patterns normalized to chondrite (after Nakamura, 1974) are characterized by relative enrichment of LREE compared to HREE (FIGURE 7A), with (La/Yb)N varying between 7.
However, their mantle normalized trace element and chondrite normalized REE patterns are similar.
05, which implies a broad opposition effect, but they may be icy and have a bright surface component (similar to carbonaceous chondrite meteorites) both of which imply a sharp opposition effect.
The concentration of each REE is divided by the concentration of that element in chondrite, which is thought to reflect the composition of the early Earth.
Figure 6 show the chondrite normalized Rare Earth Element, REE, pattern of one paleosol sample: TN-A21 and two rock sample from the Olitas Volcano for comparison.