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Diamond in kimberlite and corundum in nepheline syenite are the good examples of :

  • A.Segregation deposits
  • B.Dissemination deposits
  • C.Injection deposits
  • D.Pegmatitic deposits

Answer: B

Diamond in kimberlite and corundum in nepheline syenite are examples of dissemination deposits.

In the classification of magmatic ore deposits, early magmatic deposits are divided into dissemination, segregation and injection types. In dissemination deposits the valuable mineral crystallised early and lies scattered through the rock in place, without being concentrated, which is exactly how diamonds occur in kimberlite and corundum in nepheline syenite.

Segregation deposits are early crystals concentrated by settling, such as layered chromite. Injection deposits are concentrations squeezed into other rocks, and pegmatitic deposits form from residual fluid-rich melts.

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