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| ZIRCON U-Pb AGES OF DONGAN GOLD DEPOSIT IN HEILONGJIANG PROVINCE: Geological Implication |
| MA Fang-fang1, SUN Feng-yue1, LI Bi-le1, XUE Ming-xuan1,2 |
1. School of Earth Sciences, Jilin University, Changchun 130061, China;
2. No. 707 Team, Heilongjiang Nonferrous Metallic Geological Survey, Suihua 152054, Heilongjiang Province, China |
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Abstract The age of the rhyolite porphyry, which is closely related to mineralization in Dongan gold deposit, is tested with LA-ICPMS zircon dating method. The results show that, the U contents of the rhyolite porphyry range from 269.1×10-6 to 956.0×10-6, while the Th contents, from 202.2×10-6 to 1276.8×10-6, with Th/U ratio between 0.43 and 1.80. The age of rhyolite porphyry is (109.6±1.7) Ma, which is synchronous with other epithermal gold deposits in the area. It implies the large-scale lithospheric extension and thinning in the late period of Early Cretaceous.
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Received: 12 March 2012
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2012, Vol. 21 
