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dc.contributor.authorElbra, T.
dc.contributor.authorKontny, A.
dc.contributor.authorPesonen, L. J.
dc.contributor.authorSchleifer, N.
dc.contributor.authorSchell, C.
dc.date.accessioned2021-02-12T22:54:26Z
dc.date.available2021-02-12T22:54:26Z
dc.date.issued2007-01-01
dc.identifier.citationElbra, T., Kontny, A., Pesonen, L. J., Schleifer, N., & Schell, C. (2007). Petrophysical and paleomagnetic data of drill cores from the Bosumtwi impact structure, Ghana. Meteoritics & Planetary Science, 42(4‐5), 829-838.
dc.identifier.issn1945-5100
dc.identifier.doi10.1111/j.1945-5100.2007.tb01078.x
dc.identifier.urihttp://hdl.handle.net/10150/656710
dc.description.abstractPhysical properties from rocks of the Bosumtwi impact structure, Ghana, Central Africa, are essential to understand the formation of the relatively young (1.07 Ma) and small (10.5 km) impact crater and to improve its geophysical modeling. Results of our petrophysical studies of deep drill cores LB-07A and LB-08A reveal distinct lithological patterns but no depth dependence. The most conspicuous difference between impactites and target lithologies are the lower bulk densities and significantly higher porosities of the suevite and lithic breccia units compared to meta-graywacke and metapelites of target lithologies. Magnetic susceptibility shows mostly paramagnetic values (200 x 500 10^(-6) SI) throughout the core, with an exception of a few metasediment samples, and correlates positively with natural remanent magnetization (NRM) and Q values. These data indicate that magnetic parameters are related to inhomogeneously distributed ferrimagnetic pyrrhotite. The paleomagnetic data reveals that the characteristic direction of NRM has shallow normal (in a few cases shallow reversed) polarity, which is in agreement with the Lower Jaramillo N-polarity chron direction, and is carried by ferrimagnetic pyrrhotite. However, our study has not revealed the expected high magnetization body required from previous magnetic modeling. Furthermore, the LB-07A and LB08-A drill cores did not show the predicted high content of melt in the rocks, requiring a new interpretation model for magnetic data.
dc.language.isoen
dc.publisherThe Meteoritical Society
dc.relation.urlhttps://meteoritical.org/
dc.rightsCopyright © The Meteoritical Society
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectPetrophysics
dc.subjectBosumtwi Ghana impact crater
dc.subjectPaleomagnetism
dc.titlePetrophysical and paleomagnetic data of drill cores from the Bosumtwi impact structure, Ghana
dc.typeArticle
dc.typetext
dc.identifier.journalMeteoritics & Planetary Science
dc.description.collectioninformationThe Meteoritics & Planetary Science archives are made available by the Meteoritical Society and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information.
dc.eprint.versionFinal published version
dc.description.admin-noteMigrated from OJS platform February 2021
dc.source.volume42
dc.source.issue4-5
dc.source.beginpage829
dc.source.endpage838
refterms.dateFOA2021-02-12T22:54:26Z


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