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Geology > Geochem Radiogenics > Flashcards

Geochem Radiogenics Flashcards

1
Q

Processes that control chemical composition of igneous rocks

A

Near-Surface processes
Magma chamber processes
source region processes
Tectonic setting

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2
Q

Examples of Near surface processes

A

Outgassing of melts
Interaction with groundwater

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3
Q

Examples of magma chamber processes

A

Fractional crystallization
Contamination
Assimilation+fractional-crystalization
Magma mixing

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4
Q

Examples of Source region processes

A

Partial melting
Source mixing

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5
Q

What is the signature of near surface processes

A

Stable isotopes

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6
Q

What is the signature of Magma chamber processes

A

Stable and radiogenic isotopes

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7
Q

What is the signature of source region processes

A

Stable and radiogenic isotopes

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8
Q

What are the processes that control the chemical composition of Sedimentary rocks

A

Provenance studies
Transport and erosion
Depositional processes
Diagenetic processes

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9
Q

Examples of provenance studies

A

Tectonic setting of clastic seds
Source chemistry

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10
Q

Examples of Transport and erosion

A

River water chemistry
Sea water chemistry
meteoric water chemistry

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11
Q

Examples of depo processes

A

element residence times in seawater
Precipitation of chemical sediments

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12
Q

Examples of diagenetic processes

A

Diagenetic temperatures
Pore water composition
Limestone diagenesis

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13
Q

Signature from provenance studies

A

Radiogenic isotopes

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14
Q

Signature of transport and erosion

A

Stable and radiogenic isotopes

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15
Q

Signature from depo processes

A

Stable and radiogenic isotopes

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16
Q

Signature from Diagenetic processes

A

Stable isotopes

17
Q

What decay is proton rich that causing the atomic number to decrease by 2 and the atomic mass by 4

A

Alpha decay

18
Q

What decay is proton rich where the proton is converted to a neutron

A

Positive beta decay

19
Q

What decay is neutron rich where the the neutron is converted to a proton

A

Negative beta decay

20
Q

What decay is secondary process that causes the atom to become excited resulting in the emission of a photon

A

Gamma decay

21
Q

What is branched decay

A

Several decay mechanisms acting simultaneously

22
Q

True or False: Branched decay results in decreased yield of daughter atoms

A

True

23
Q

What instrument would you use for measuring the decay in a rock

A

Mass Spectrometer

24
Q

What Isotopic variations between rocks are caused by

A

Mass Fractionation
Daughters produced in varying proportions
Time

Geology (10 decks)

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