Neutron activation analysis of Permian-Triassic boundary layer samples at the Selong Site in China
Journal of Radioanalytical and Nuclear Chemistry, ISSN: 0236-5731, Vol: 216, Issue: 2, Page: 183-190
1997
- 2Citations
- 6Captures
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Metrics Details
- Citations2
- Citation Indexes2
- CrossRef2
- Captures6
- Readers6
Conference Paper Description
Thirty samples from a limestone stratum across the Permian-Triassic (P- Tr) boundary layer in China were analyzed for 30 elements by instrumental neutron activation analysis, wavelength dispersive X-ray fluorescence and ICP-MS, and also for mineral compositions with a powder X ray diffractometer. The depth profile was found to indicate a sudden change of elemental and mineral compositions across the P-Tr boundary. Also the profile showed several peaks in elemental concentrations in the lower Permian layered samples as well as in the overlying Triassic strata, which are associated with the change of mineral compositions. Elemental profiles were found to be classified into 4 groups and to give some insights in the geochemical records. Ir is far less abundant (0.1 ppt) compared with that of the K-T boundaries (10 ppb), and the Ir/Co ratio is outside the K-T and Cl chondrite trends. This change of elementary profile is suggestive of the internal muses rather than the external ones such as an asteroid impact for the mass extinction at the P-Tr boundary.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0030911082&origin=inward; http://dx.doi.org/10.1007/bf02033776; http://link.springer.com/10.1007/BF02033776; https://dx.doi.org/10.1007/bf02033776; https://link.springer.com/article/10.1007/BF02033776; http://www.springerlink.com/index/10.1007/BF02033776; http://www.springerlink.com/index/pdf/10.1007/BF02033776
Springer Science and Business Media LLC
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