Geochem Radiogenics Flashcards
Processes that control chemical composition of igneous rocks
Near-Surface processes
Magma chamber processes
source region processes
Tectonic setting
Examples of Near surface processes
Outgassing of melts
Interaction with groundwater
Examples of magma chamber processes
Fractional crystallization
Contamination
Assimilation+fractional-crystalization
Magma mixing
Examples of Source region processes
Partial melting
Source mixing
What is the signature of near surface processes
Stable isotopes
What is the signature of Magma chamber processes
Stable and radiogenic isotopes
What is the signature of source region processes
Stable and radiogenic isotopes
What are the processes that control the chemical composition of Sedimentary rocks
Provenance studies
Transport and erosion
Depositional processes
Diagenetic processes
Examples of provenance studies
Tectonic setting of clastic seds
Source chemistry
Examples of Transport and erosion
River water chemistry
Sea water chemistry
meteoric water chemistry
Examples of depo processes
element residence times in seawater
Precipitation of chemical sediments
Examples of diagenetic processes
Diagenetic temperatures
Pore water composition
Limestone diagenesis
Signature from provenance studies
Radiogenic isotopes
Signature of transport and erosion
Stable and radiogenic isotopes
Signature from depo processes
Stable and radiogenic isotopes
Signature from Diagenetic processes
Stable isotopes
What decay is proton rich that causing the atomic number to decrease by 2 and the atomic mass by 4
Alpha decay
What decay is proton rich where the proton is converted to a neutron
Positive beta decay
What decay is neutron rich where the the neutron is converted to a proton
Negative beta decay
What decay is secondary process that causes the atom to become excited resulting in the emission of a photon
Gamma decay
What is branched decay
Several decay mechanisms acting simultaneously
True or False: Branched decay results in decreased yield of daughter atoms
True
What instrument would you use for measuring the decay in a rock
Mass Spectrometer
What Isotopic variations between rocks are caused by
Mass Fractionation
Daughters produced in varying proportions
Time
