| 徐书奎.豫西曹家窑岩体LA-ICP-MS锆石U-Pb定年及地质意义[J].地质找矿论丛,2025,40(1):93-99 |
| 豫西曹家窑岩体LA-ICP-MS锆石U-Pb定年及地质意义 |
| LA-ICP-MS zircon U-Pb dating of Caojiayao pluton in west Henan province and the geological significance |
| 投稿时间：2024-06-15 修订日期：2024-12-13 |
| DOI：10.6053/j.issn.1001-1412.2025.01.011 |
| 中文关键词: 曹家窑岩体 锆石U-Pb定年 崤山 豫西 |
| 英文关键词:Caojiayao monzonitic granite zircon U-Pb dating Xiaoshan area Henan province |
| 基金项目:河南省有色金属地质矿产局2018年重点项目(豫色地矿办[2018]30号)与河南省有色金属地质矿产局首批科技创新专项资金(揭榜挂帅)项目(豫色地矿文[2021]62号)共同资助。 |
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| 中文摘要: |
| 崤山与其毗邻的小秦岭、熊耳山同属华北陆块南缘,是豫西金银多金属矿的重要成矿区和找矿潜力区。崤山区内大面积出露新太古代中酸性侵入岩体,这些岩体的形成时代、地球化学特征等仍未得到深入的研究和探讨。文章对崤山中部曹家窑二长花岗岩体开展锆石LA-ICP-MS U-Pb定年,显示曹家窑二长花岗岩体锆石U-Pb年龄为2444 Ma±31 Ma,地球化学特征显示其测点数据落入Ⅰ-型花岗岩系列和埃达克岩区,富集轻稀土,亏损重稀土,轻重稀土分馏明显,w(La)N/w(Yb)N=3.82~30.83,w(Y)=10.2×10-6~11.7×10-6,岩石稀土配分曲线右倾。综合分析认为,曹家窑二长花岗岩具埃达克岩属性,属高钾钙碱性同融型花岗岩(Ⅰ型),是新太古代地壳增厚的产物。 |
| 英文摘要: |
| Xiaoshan area and the adjacent Xiaoqinlinng and Xiongershan areas all belong to the south margin of north China block. The marginal area is an important Au-Ag polymetallic metallogenic and potential propecting area in west Henen province. In Xiaoshan area is exposed large area of Neo-Archean intermediate-acid intrusive rocks and formation time and geochemical characteristics of the intrusive rocks have not been intensively studied and discussed. This paper deals with the problem. LA-ICP-MS zircon U-Pb dating was made on samples from the intrusive rocks and obtained U-Pb age 2444 Ma ±31 Ma of Caojiayao monzonitic granite. The analysis data point fall in field of I-type granitic series and adakite. REE are fractionated, LREE enriched, HREE depleted. w(La)N/w(Yb)N=3.82~30.83, w(Y)=10.2×10-6~11.7×10-6. REE pattern obliques to right. The data above show that Caojiayao monzonitic granite is characteristic of adakite belonging to high K-Ca-alkaline syntectic granite. It is the product of crustal thickening. |
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