黑龙江东安金矿床锆石U-Pb年龄及其地质意义

详细信息

收稿日期: 2012-03-12

修回日期: 2012-05-03

刊出日期: 2012-06-30

ZIRCON U-Pb AGES OF DONGAN GOLD DEPOSIT IN HEILONGJIANG PROVINCE: Geological Implication

Received Date: 12 March 2012

Revised Date: 03 May 2012

Publish Date: 30 June 2012

摘要: 通过LA-ICPMS锆石原位定年方法，对黑龙江东安金矿成矿期脉岩流纹斑岩进行了年龄测定.结果显示，与矿化关系极为密切的流纹斑岩的U和Th含量分别为269.1×10-6~956.0×10-6和202.2×10-6~1276.8×10-6，Th/U比值介于0.43~1.80之间.流纹斑岩206Pb/238U年龄的加权平均值为109.6±1.7 Ma，与区内浅成低温热液金矿的成矿年龄相近，共同记录了本区早白垩世晚期的一次重要成岩成矿事件，反映了早白垩世晚期岩石圈大规模伸展减薄的动力学背景.
- 锆石U-Pb年龄 /
- 地质意义 /
- 矿化关系 /
- 东安金矿床 /
- 黑龙江省
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.
- zircon U-Pb age /
- geological implication /
- mineralization relationship /
- Dongan gold deposit /
- Heilongjiang Province