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Re-Os dating of pyrite from Giant Bayan Obo REE-Nb-Fe deposit.
- Source :
-
Chinese Science Bulletin . Dec2004, Vol. 49 Issue 24, p2627-2631. 5p. 2 Diagrams, 1 Chart. - Publication Year :
- 2004
-
Abstract
- Six pyrite samples from the giant Bayan Obo REE-Nb-Fe deposit are dated by Re-Os technique. Pyrite studied is associated with barite and separated from a vein cutting REE mineralization. Pyrites analyzed contain 16–30 ng Re and 0.10–0.16 ng Os, and yield a Caledonian isochron age of 439 ± 86 Ma. High Re/Os ratio, low Os concentration and highly radiogenic Os isotopic ratios of these samples suggest that they are of crustal origin. The northern margin of the North China Block was a passive continental margin, but not a subduction zone with enormous volcanic activities in the Early Paleozoic Era. Our Re-Os result provides new evidences, showing that Bayan Obo deposit experienced a thermal disturbance of crustal origin in the Caledonian time and some isotopic systems recorded only the time of the disturbance, not the mineralization age. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10016538
- Volume :
- 49
- Issue :
- 24
- Database :
- Academic Search Index
- Journal :
- Chinese Science Bulletin
- Publication Type :
- Academic Journal
- Accession number :
- 16680468
- Full Text :
- https://doi.org/10.1360/04wd0185