Information om | Engelska ordet CHONDRULES

Exempel på hur man kan använda CHONDRULES i en mening

• Non-metallic meteorites that lack chondrules are achondrites, which are believed to have formed more recently than chondrites.
• He specializes in key research areas encompassing chondrules, mineralogy, Allende meteorite, chondrites, and astrophysics.
• Evidence suggests the main growth of asteroids can result from gas-assisted accretion of chondrules, which are millimeter-sized spherules that form as molten (or partially molten) droplets in space before being accreted to their parent asteroids.
• Saponite is also found in the "dark rims" of chondrules in carbonaceous chondrites and seen as a sign of aqueous alteration.
• They are a regolith breccia consisting mostly of eucrite and diogenite fragments, although carbonaceous chondrules and impact melt can also occur.
• Wasson (2003) – For important studies on the classification, origin, and early history of iron meteorites and chondritic meteorites, and on the mode of formation of chondrules.
• This reveals a dark matrix embedded throughout with mm-sized, lighter-colored chondrules, tiny stony spherules found only in meteorites and not in earth rock (thus it is a chondritic meteorite).
• Fegley (1984) Origin of spinel-rich chondrules and inclusions in carbonaceous and ordinary chondrites.
• All enstatite chondrites are dominantly composed of enstatite-rich chondrules plus abundant grains of metal and sulfide minerals.
• Depending on the formational environment, microspherulites can be classed as oolites, micrometeorites, impact spherulites, iberulites, pisolites, aerolites, chondrules, biolites, pellets, bubbles, or carbonaceous microspherules.
• The main petrologic characteristic of Type 1 chondrites, such as CIs, is the lack of recognizable chondrules, thus excepting the sample from Tagish Lake.
• Like all primitive achondrites, acapulcoites have chemical composition and mineralogical similarities with chondrites, and some specimens even show relict chondrules.
• The main arguments for this hypothesis are the relics of chondrules, the euhedral enstatites surrounded by meteoric iron and the occurrence of keilite.
• Signs of water include phyllosilicates ("clay" and serpentinites), sulfides and sulfates, and carbonates, as well as structural signs: veins, and alteration or total erasure of individual chondrules.
• Many CM chondrules are surrounded by either rims of accessory minerals, or haloes of water-altered chondrule material.

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