EESA06H3 Lecture Notes - Lecture 8: Geologic Time Scale, Radiometric Dating, Decay Product
29 Feb 2016
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Document Summary
Stratigraphy the study of the arrangement of rocks in time. Accommodation need of subsiding crust to accumulate sediments (uplift erosion, removal of sediment rock) Conformable succession where layers of rock sit on each other without big gaps. Unconformable succession where layers sit on each other with incomplete gaps. Index fossils and faunal succession fossils that dissolve very quickly. Brittle failure of rocks to form faults rocks breaking. Isotope dating using unstable radioactive isotopes radiometric dating. Parent isotope (e. g. , u238 and daughter product (e. g. , lead pb) breaks down with radioactive decay. Half life time needed to reduce the original amount of any one radioactive isotope by half. Plutons intruded into the rocks massive bodies of granite. Disconformities mark pauses in sedimentation within an otherwise conformable succession of strata. Strike edge of the layer that is dipping. Multiphase complexity of rocks is a result of phases being dependent on the previous one.
