Economic Geology Part 2 Flashcards Preview

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Flashcards in Economic Geology Part 2 Deck (11):
1

What are disseminated hydrothermal ore deposits

Mineral is distributed through rock body, rather than concentrated in veins

2

Describe Vocanogenic Massive Sulphide (VMS)

deposits are lenses of sulphide material that accumulate on the seafloor from hydrothermal events

3

What are black smokers?

Heater seawater rich in dissolved metals vented from seafloor

4

What are sedimentary exhalative deposits?

• Massive sulphide deposits formed from
seafloor hydrothermal vents in sedimentary
basins

5

Sediment-Hosted Stratiform Copper

Oxidized copper-bearing brines moving through coarse-grained
sedimentary rock are forced upward into reduced sediments, which
promotes the precipitation of sulphide minerals

6

Unconformity-Associated Uranium

Oxidized uranium-bearing brines moving through coarse-grained
sedimentary rock are forced upward into reduced sediments, which
promotes the precipitation of reduced uranium minerals

7

Define Placer deposits

formed when heavy metals are
mechanically concentrated by currents in rivers

8

Define residual enrichment

concentrating metals into economically valuable concentrations

9

What is the principle ore of aluminum

bauxite

10

What is laterite, and where is it formed?

(enriched in Fe, Al, Ni) forms by deep weathering of
the parent rock and leaching out elements such as silica

11

What rare, ultramaific rocks are diamonds found in?

kimberlites