A study of hydrocarbon migration events: Development and application of new methods for constraining the time of migration and an assessment of rock-fluid interactions. Final report, September 1, 1991--August 31, 1994 Page: 7 of 9
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the other involves secondary magnetite precipitation triggered by migrating fluids. We have
conducted simulation experiments to investigate the replacement of pyrite by magnetite in the
presence of organic matter which we believe is the major process of magnetite authigenesis in the
Belden (Brothers et al., 1993). We have successfully produced magnetite by a dissolution-
reprecipitation process which may simulate diagenesis at temperatures below 1000C and is one
possible pathway for magnetite authigenesis.
IV. OLD RED SANDSTONE, SCOTLAND
We have collected and analyzed a suite of samples from red as well as hydrocarbon-
impregnated sandstones from the Old Red Sandstone (Devonian) in Scotland. Preliminary results
indicate that the impregnated rocks contain a magnetization residing in magnetite in contrast to
the red samples where the magnetization resides in hematite. We have not been able to isolate a
stable direction from the impregnated samples. We have, however, found a stable late Paleozoic
magnetization (in magnetite) in lacustrine organic-rich silts in the unit (Plaster-Kirk et al., 1993).
The results we have obtained are encouraging and we plan to conduct an additional sampling trip.
One of the key objectives of the research is to compare the paleomagnetic dating method
with a Pb-Pb radiometric dating approach used by our colleague, John Parnell. He has had
problems with his laboratory and we have no radiometric dates to report as yet. As soon as the lab
is functional, we plan to acquire dates from the same rocks we sampled in Scotland.
VI. STUDENT PARTICIPATION
A significant proportion of the funds in the grant is being used to support the research of
four graduate students. Mr. David Fruit, a Ph.D. candidate under the supervision of Dr. Elmore, is
working on the paleomagnetism and geochemistry of the Schoolhouse and Belden formations. Ms.
Lisa Plaster-Kirk, a M.S. student working with Dr. Elmore, is working on the paleomagnetism of
samples from Scotland and helping with the analysis of the rocks from Colorado. Ms. Kendra
Brisman, a M.S. student under the supervision of Dr. Engel, is working on the organic
geochemistry of the Schoolhouse and Belden formations. Ms. Cindy Brothers, a Ph.D. candidate
under the supervision of Dr. Engel, is working on the laboratory simulation experiments.
VII. PRESENTATIONS AND PUBLICATIONS
The presentations and papers that were partially or completely supported by this grant are
listed below. Papers are included in the Appendix.
Brothers, L., Engel, M.H., Elmore, R.D., and Fruit, D., 1993, Formation of magnetic minerals via
diagenetic reactions of iron and organic matter: Implications for paleomagnetic dating:
Amer. Chem. Soc. National Meeting, GEOC 74.
Elmore, R.D., 1992, Remagnetization and fluids: EOS, v. 73, p. 35.
Elmore, R.D., Imbus, S., Engel, M., and Fruit, D., 1993, Hydrocarbons and magnetizations in
magnetite: SEPM Special Publication #49, 181-191.
Elmore, R.D., and Engel, M.H., A study of hydrocarbon migration events: Development and
application of new methods for constraining the time of migration and an assessment of
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Elmore, R.D. & Engel, M.H. A study of hydrocarbon migration events: Development and application of new methods for constraining the time of migration and an assessment of rock-fluid interactions. Final report, September 1, 1991--August 31, 1994, report, December 31, 1993; United States. (https://digital.library.unt.edu/ark:/67531/metadc709289/m1/7/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.