Re-Os dating of pyrite from Giant Bayan Obo REE-Nb-Fe deposit |
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Authors: | Yulong?Liu Gang?Yang Email author" target="_blank">Jiangfeng?ChenEmail author Andao?Du Zhi?Xie |
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Institution: | (1) Laboratory for Earth Material Cycling, School of Earth and Space Sciences, University of Science and Technology of China, 230026 Hefei, China;(2) Institute of Rock and Mineral Analysis, Chinese Academy of Geological Sciences, 100037 Beijing, China |
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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. |
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Keywords: | pyrite Re-Os dating REE mineralization disturbance |
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