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Definition of zone

i. A belt, band, or strip of earth materials, however disposed; characterized as distinct from surrounding parts by some particular property or content; e.g., zone of saturation, fault zone, or a zone of secondary enrichment.

Compare with: belt

ii. See: aureole

iii. A minor interval in any category of stratigraphic classification. There are many kinds of zones, depending on the characteristics under consideration--biozones, lithozones, chronozones, mineralized zones, metamorphic zones, zones of reversed magnetic polarity, etc. The term should always be preceded by a modifier indicating the kind of zone to which reference is made.

Ref: AGI

iv. A metal zone is equivalent to a mineral zone, yet the terms mineral and metal are not synonymous.

Ref: Ricketts

v. The ground or mass bounded by horizontal or inclined planes or curved surfaces in which given chemical or physical conditions exist, such as zone of saturation or zone of weathering.

Ref: Nelson

vi. A group of beds characterized by the presence of one or more specific fossils; e.g., zonal fossil or fossils.

Ref: BS, 11

vii. Geologically, a distinctively mineralized area, region, or level. In a specific lode or other deposit, the progressive change from upper to lower horizons. At the top is outcrop or gossan, oxidized or weathered. Next is the leached zone, impoverished by dissolution of its values (or part of them), which may be redeposited below in the zone of secondary enrichment. Below this is the primary, or unaltered zone, which consists of the original sulfide formation.

Ref: Pryor, 3

viii. An area or region more or less clearly set off or characterized as distinct from surrounding or adjoining parts; e.g., the mineral zone in a metalliferous region.

Ref: Webster 2nd

ix. A series of faces of a crystal whose intersection lines with each other are all parallel.

Ref: Webster 3rd

x. See: zones


 
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