奈林沟金矿床是朝阳—赤峰金矿带中一个火山岩型金矿床,赋存于铁匠营子盆地的火山岩层位中。在地质调查的基础上,根据岩石组合,将铁匠营子盆地火山岩分为3期。对火山岩样品分别进行了锆石U-Pb LA-ICP-MS测年。结果显示铁匠营子火山岩分为3个时期：(160.8±1.9)Ma、(130.8±1.7)~(124.7±1.2)Ma、(121.6±2.8)Ma。奈林沟金矿床赋存金的石英脉出露于义县组一段安山岩中,在义县组二段中并未出现,故限定奈林沟金矿床成矿时代为124.7~121.6 Ma,结合其他邻近的金矿床认为132~116 Ma是朝阳—赤峰金矿带重要的成矿时代。
Nailingou Gold Deposit is a volcanic rock gold deposit located in Chaoyang-Chifeng Gold Belt and is hosted in the volcanic rocks in Tiejiangyingzi Basin. On the basis of geological survey,the volcanic rocks are divided into three phases according to the rock association. LA-ICP-MS and zircon U-Pb dating are used for the dating of the volcanic rocks and the results indicate that the three ages are (160. 8 ± 1. 9)Ma,(130. 8 ± 1. 7)Ma to (124. 7 ± 1. 2)Ma and (121. 6 ± 2. 8)Ma. The quartz vein hosting the Au outcropped in the andesite in Member 1 of Yixian Formation instead of Member 2 of Yixian Formation,which means the metallogenic age of Nailingou Gold Deposit was 124. 7 Ma to 121. 6 Ma. Comparing other nearby gold deposits, the paper reaches the conclusion that 132 Ma to 116 Ma is an important metallogenic age of Chaoyang-Chifeng Gold Belt.
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