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MAGMATIC SEGREGATION DEPOSIT [1 record]

Record 1 2003-10-27

English

Subject field(s)
  • Metals Mining
DEF

An ore deposit formed by magmatic segregation, generally in mafic rocks and layered intrusions, as crystals of metallic oxides or from an immiscible sulfide liquid.

OBS

The term "magmatic segregation deposit" is now applied to all ore deposits that are direct crystallization products of a magma, exclusive of pegmatites. They usually form in deep-seated intrusive bodies, but have been known to form in sills and even in lava flows. A magmatic segregation deposit may constitute the entire rock mass or a compositional layer, or may be defined by the presence of valuable accessory minerals in an otherwise normal igneous rock.

French

Domaine(s)
  • Mines métalliques
OBS

«Gîtes de ségrégation». La concentration des minéraux utiles dans la roche éruptive est beaucoup plus poussée que dans le type des gîtes d'inclusions. Elle arrive parfois à créer des masses de minerai presque sans gangue. Elle provient de ségrégation due à une différenciation du magma poussée jusqu'aux extrêmes en certaines parties de la masse. Les principaux minéraux qui peuvent se rassembler de la sorte sont les suivants d'après S.J. Shand : magnétite, ilménite, chromite et autres spinelles, pyrite, pyrrhotine, chalcopyrite, nickéline, mispickel. Il s'y adjoint en moindre quantité : pentlandite, molybdénite, smaltine, cobaltine, sperrylite, et les sulfures, arséniures, antimoniures d'argent.

Key term(s)
  • gisement de ségrégation

Spanish

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