When considering hydrothermal deposits, vein- or fissure-filling deposits of metallic ores such as gold or silver are common in ________.
A)rocks of a contact-metamorphic zone that formed around a shallow granite pluton
B)pyroclastic materials erupted from a stratovolcano
C)impact structures from meteorites
D)rocks that form in high-pressure subduction zones

Question

Quizplus · Accepted Answer

Vein- or fissure-filling deposits of metallic ores such as gold or silver are common in rocks of a contact-metamorphic zone that formed around a shallow granite pluton. Hydrothermal fluids are often released from the cooling plutons and migrate through the surrounding rocks, depositing metallic minerals in fractures and veins within the rock.

When Considering Hydrothermal Deposits, Vein- or Fissure-Filling Deposits of Metallic