metallicity

(redirected from Metal-rich)

metallicity

(met-ă-liss -ă-tee) (metal abundance) Symbol: Z . The fraction by mass of metals in a star, cluster of stars, or in some other astronomical entity. Since metals are produced by nucleosynthesis in stars, the metallicity of an object or class of objects depends on when it was formed: objects of later origin in general have a higher metallicity. Metallicity is determined by photometry or high-resolution spectroscopy, and is usually expressed relative to solar metallicity (see cosmic abundance), and as the ratio of iron to hydrogen, Fe/H. See also population I, population II.
References in periodicals archive ?
Thus the resulting new crust would be metal-rich, which is at odds with the new observations.
Binzel and his team found that Boznemcova has a relatively flat (neutral) spectrum at visible wavelengths and a distinct absorption near 1 micron, strong evidence for the presence of the metal-rich, calcium-poor silicates that are a hallmark of ordinary-chondrite mineralogy.
Toquima controls 100% of the precious and base metal-rich Palmer project in Alaska.
Spectra of Gaspra show a distinct absorption at 1 micron in the near infrared, a strong indication that the surface is dominated by the same metal-rich silicates -- and perhaps even pure metal -- that would occur at the core-mantle boundary of a larger and once-molten parent object.
Geochemical and geophysical surveys by Teck Cominco and more recently by Northern Dynasty substantiated that the Pebble deposit is only part of a much larger series of metal-rich, coalescing hydrothermal sulphide systems.
The RDN, located in northwest British Columbia, is underlain by rocks similar in age, composition, alteration and mineralization to that hosting Barrick's Eskay Creek precious metal-rich massive sulphide deposit, (Total Ore Reserve 1.
The 21 kilometre long RDN property is largely underlain by Early to Middle Jurassic stratigraphy similar in age, lithology, alteration and mineralization to that hosting the Eskay Creek precious metal-rich massive sulphide deposit, 40 kilometres to the south-southeast.
TSE:FAN; VSE:FAN) is pleased to announce three, new precious metal-rich massive sulphide discoveries at Farallon's 100% owned Campo Morado Project in Guerrero State, Mexico.
These highly prospective areas share a similar favourable geologic setting for large scale epithermal mineralization, schist or shear zone hosted, and precious and base metal-rich manto mineralization.
Massive galaxies tend to have both metal-poor (appearing blue) and metal-rich (appearing red) globular clusters.
Giant galaxies like the NGC 1277 generally contain both metal-rich (red in appearance) and metal-poor (blue in appearance) globular clusters.

Full browser ?