Synonymer & Information om | Engelska ordet AUTHIGENIC

Exempel på hur man kan använda AUTHIGENIC i en mening

• In contrast, some carbonados contain authigenic inclusions of minerals characteristic of the Earth's crust; the inclusions do not necessarily establish formation of the diamonds in the crust, because while the obvious crystal inclusions occur in the pores that are common in carbonados, they may have been introduced after carbonado formation.
• Faujasite occurs in vesicles within basalt and phonolite lava and tuff as an alteration or authigenic mineral.
• Characteristic petrographic features of seep carbonates are authigenic, early diagenetic carbonate phases, such as microcrystalline calcite(micrite), yellow calcite, and banded and botryoidal aggregates of fibrous cement and the carbon isotope signature of these early diagenetic carbonate phases typically have very negative δ 13 C signatures, significantly lower than marine bicarbonate and occasionally even lower than 50‰.
• Sections of the uppermost part show various types of intercalations: silt- and sandstone layers grade laterally into sequences of interbedded shale and sandstone with occasional intercalations of stromatolitic layers, carbonate horizons with molluscs, bone beds of fish scales and white layers rich in authigenic feldspar.

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