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Anomalous quartz from the Roter Kamm impact crater, Namibia - Evidence for post-impact hydrothermal activity?Quartz pebbles from the Roter Kamm impact crater (the Namib Desert, SWA/Namibia) were examined for evidence of impact-induced hydrothermal activity, using results from microprobe analyses, neutron activation analyses, transmission IR spectroscopy, and X-ray diffractometry. It was found that the pebbles consisted of pure quartz, which contains three different types of fluid inclusions. These were identified as primary inclusions (5-10 microns) that record the formation conditions of the quartz, very small (less than 1 micron) secondary inclusions associated with the grain boundaries, and late inclusions of irregular size. It is concluded that the quartz and the primary inclusions may provide evidence for a postimpact phase of extensive hydrothermal activity, generated by the residual heat from the kinetic energy of the impact.
Document ID
19890064396
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Koeberl, Christian
(Lunar and Planetary Institute, Houston, TX; Wien, Universitaet Vienna, Austria)
Fredriksson, Kurt
(Smithsonian Institution Washington, DC, United States)
Goetzinger, Michael
(Wien, Universitaet Vienna, Austria)
Reimold, Wolf Uwe
(University of the Witwatersrand Johannesburg, Republic of South Africa, United States)
Date Acquired
August 14, 2013
Publication Date
August 1, 1989
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 53
ISSN: 0016-7037
Subject Category
Geophysics
Accession Number
89A51767
Funding Number(s)
PROJECT: FFWF PROJECT P-6072-E
CONTRACT_GRANT: NASW-4066
Distribution Limits
Public
Copyright
Other

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