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tMax is the temperature at which maximum hydrocarbons are emitted during the S2 phase of pyrolysis. During the S2 phase, only kerogen is emitted as all other hydrocarbons should have been released during the S1 phase.
A higher tMax indicates that the kerogen required higher pyrolysis temperatures to crack. A lower tMax indicates that the kerogen requires lower pyrolysis temperatures to crack.
Kerogen cracked at lower temperatures (lower tMax) is more immature since it did not encounter equal temperatures/pressures in situ. Kerogen cracked at higher temperatures is said to be more mature, since all easily accessible kerogen was already cracked in situ (indicating a prolonged exposure to heat and pressure).
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