Geology Reference
In-Depth Information
rocks Kent studied were clasts of the Paleozoic lime-
stones that carry the Kiaman-age Late Paleozoic
remagnetization discussed in Chapter 6. The clasts
were remagnetized by a TVRM, with little heating,
during the Holocene. Thermal demagnetization at tem-
peratures higher than those predicted by Pullaiah
et al
.
suggests that TVRM may be more pernicious than
theory indicates.
mentary rock is magnetized and what tests should be
used to check the age and accuracy of the magnetiza-
tion of sedimentary rock. The fl owchart depicted by
Fig. 9.4 summarizes the main processes covered in this
topic, including references to the chapter where the
process is discussed and an estimate of the time after
deposition when the process occurs.
The main point to take away from this topic is that,
although there are many processes that can affect the
accuracy and age of the paleomagnetism of a sedimen-
tary rock, there are many laboratory and fi eld tests that
can check for inaccuracies and the age of magnetiza-
tion. Some laboratory experiments can correct the
inaccuracies; other laboratory or fi eld tests simply
make the worker aware of processes that affected the
magnetization of the rock subsequent to deposition so
they can be considered in the interpretation of the
paleomagnetic results. Many paleomagnetists already
do this, but hopefully this topic can act as a guide for
those who want to evaluate paleomagnetic data in the
literature or acquire their own paleomagnetic dataset.
SEDIMENTARY ROCK
PALEOMAGNETISM: PROCESS AND
INTERPRETATION
This topic has been written to give geologists and stu-
dents of paleomagnetism a sense of how sediments
and sedimentary rocks acquire their paleomagnetism
and the different processes that can affect a primary
magnetization during the post-depositional history of
a rock. It is written to give geologists a better apprecia-
tion of how paleomagnetists understand how a sedi-
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