Graphite deposits typically form ________.
A)as hydrothermal vein deposits in limestone around a granitic batholith
B)by regional metamorphism of organic-rich, black shales
C)as deposits around submarine, hot spring vents
D)by decomposition of humus and soil gases during intense, tropical weathering

Question

Quizplus · Accepted Answer

Graphite is formed by regional metamorphism of organic-rich, black shales. This process involves the burial and heating of organic-rich sediments, which causes the carbon to crystallize into graphite. The other options listed do not accurately describe the formation of graphite deposits.

Graphite Deposits Typically Form ________