摘要
采用高分辨率离子探针 (SHRIMP)对水泉沟碱性杂岩体锆石U Pb的分析结果表明 ,东坪金矿区二长岩和后沟金矿区正长岩年龄分别为 ( 390± 6)和 ( 386± 7)Ma ,两者几乎同时形成 ,并构成了一个大的复式岩基 ,即水泉沟碱性杂岩基。结合有关矿床形成的年代学资料 ,认为水泉沟碱性杂岩仅仅作为金矿床的围岩 ,与东坪和后沟等金矿床之间不存在直接的成因联系。
U Pb in zircons from the Shuiquangou alkali complex in northwestern Hebei Province is analyzed using the Sensitive High Resolution Ion Microprobe (SHRIMP). The analysis result indicates that Dongping monzonite and Hougou syenite were emplaced at(390±6) Ma and(386±7) Ma, respectively. This suggests that the monzonite and the syenite are simultaneous and constitute one big complex bathlith the Shuiquangou alkali complex. These analysis and chronological data of the gold deposits in the area reveal that although the alkali complex hosts gold deposits (e.g. Dongping and Hougou), no direct genetic links between them.
出处
《黄金地质》
2001年第1期1-6,共6页
Gold Geology
基金
中国西澳经济技术研究基金
