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辽东翁泉沟硼矿区二长花岗岩脉锆石U-Pb年龄及对成矿时代的制约

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文章导航 > 地质与资源 > 2022 > 31(3): 342-350

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赵岩, 李生辉, 杨中柱, 张朋, 陈井胜, 张璟, 陈聪. 辽东翁泉沟硼矿区二长花岗岩脉锆石U-Pb年龄及对成矿时代的制约[J]. 地质与资源, 2022, 31(3): 342-350. doi: 10.13686/j.cnki.dzyzy.2022.03.009
引用本文: 赵岩, 李生辉, 杨中柱, 张朋, 陈井胜, 张璟, 陈聪. 辽东翁泉沟硼矿区二长花岗岩脉锆石U-Pb年龄及对成矿时代的制约[J]. 地质与资源, 2022, 31(3): 342-350. doi: 10.13686/j.cnki.dzyzy.2022.03.009
shu
ZHAO Yan, LI Sheng-hui, YANG Zhong-zhu, ZHANG Peng, CHEN Jing-sheng, ZHANG Jing, CHEN Cong. ZIRCON U-Pb DATING OF MONZOGRANITE DIKES IN WENGQUANGOU BORON OREFIELD, EASTERN LIAONING: Constraints on Metallogenic Age[J]. Geology and Resources, 2022, 31(3): 342-350. doi: 10.13686/j.cnki.dzyzy.2022.03.009
Citation: ZHAO Yan, LI Sheng-hui, YANG Zhong-zhu, ZHANG Peng, CHEN Jing-sheng, ZHANG Jing, CHEN Cong. ZIRCON U-Pb DATING OF MONZOGRANITE DIKES IN WENGQUANGOU BORON OREFIELD, EASTERN LIAONING: Constraints on Metallogenic Age[J]. Geology and Resources, 2022, 31(3): 342-350. doi: 10.13686/j.cnki.dzyzy.2022.03.009
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辽东翁泉沟硼矿区二长花岗岩脉锆石U-Pb年龄及对成矿时代的制约

  • 1.

    中国地质调查局 沈阳地质调查中心, 辽宁 沈阳 110034

  • 2.

    辽宁省自然资源厅深部矿产资源探测与评价重点实验室, 辽宁 沈阳 110032

  • 3.

    辽宁省有色地质103队有限责任公司, 辽宁 丹东 118008

  • 基金项目:
    国家重点研发计划项目"华北克拉通辽东/胶东重要成矿区带金多金属矿深部预测及勘查示范"(2018YFC0603804);中国地质调查局地质调查项目"东北地区铜金稀有金属矿产地质调查"(DD20221678-03)
详细信息
    作者简介: 赵岩(1985-), 男, 博士, 高级工程师, 从事辽东前寒武纪地质及成矿研究, 通信地址辽宁省沈阳市皇姑区黄河北大街280号, E-mail//cugzhaoyan@126.com

  • 中图分类号: P619.2;P597.1

ZIRCON U-Pb DATING OF MONZOGRANITE DIKES IN WENGQUANGOU BORON OREFIELD, EASTERN LIAONING: Constraints on Metallogenic Age

  • 1.

    Shenyang Center of China Geological Survey, Shenyang 110034, China

  • 2.

    Key Laboratory of Deep Mineral Resources Exploration and Evaluation, Liaoning Provincial Department of Natural Resources, Shenyang 110032, China

  • 3.

    Liaoning Non-Ferrous No. 103 Geological Team Co., Ltd., Dandong 118008, Liaoning Province, China

    摘要

  • 辽东地区翁泉沟硼矿区露天采场产出一条切穿硼矿体的二长花岗岩脉.本研究采集了该二长花岗岩脉的薄片、化学分析样品，并进行锆石LA-ICP-MSU-Pb年代学测试分析.该二长花岗岩脉具有高SiO2含量，为71.82%~75.68%，较高的Na2O+K2O含量，为8.41%~10.57%，属钙碱性-高钾钙碱性系列花岗岩.岩脉中锆石颗粒呈自形柱状，CL图中较黑，因铀含量较高引起.U-Pb上交点年龄为1842±29Ma，其中9个测点得出1842±30Ma的加权平均年龄，反映了该花岗岩脉侵位于古元古代晚期，同时翁泉沟硼镁铁矿成矿应早于该时代.此年龄与前人研究古元古代胶辽吉造山过程中变质作用峰后时间相吻合，反映了古元古代造山作用过程中伴随了硼矿成矿事件.

    A monzogranite dike cuts through the ludwigite orebody in the open pit of Wengquangou boron deposit, Liaodong Peninsula. Samples of the dike are collected for thin section and zircon LA-ICP-MS U-Pb geochronology analysis. The monzogranite dike is characterized by high SiO2 content(71.82%-75.68%) and high Na2O+K2O content (8.41%-10.57%), belonging to calc alkali-high K calc alkaline series granite. The zircon grains in the dikes are euhedral column in shape and dark in the CL image due to the high uranium content. The U-Pb upper intercept age is 1842±29 Ma, among which 9 testing points yield the weighted average age of 1842±30 Ma, indicating that the emplacement age of dike was Late Paleoproterozoic and the Wengquangou ludwigite deposit should be formed earlier. The age is consistent with the post-peak time of metamorphism in the Paleoproterozoic Jiao-Liao-Ji orogeny, reflecting the boron mineralization occurred during the process.

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  • 图 1  辽东半岛翁泉沟硼矿床地质简图（据文献[6]修改）

    Figure 1. 

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    图 2  翁泉沟硼镁铁矿床及二长花岗岩图片

    Figure 2. 

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    图 3  翁泉沟硼矿二长花岗岩判别图解（底图据文献[37-38]）

    Figure 3. 

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    图 4  翁泉沟硼矿二长花岗岩岩性系列判别图解（据文献[39]修改）

    Figure 4. 

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    图 5  二长花岗岩部分锆石阴极发光图像

    Figure 5. 

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    图 6  翁泉沟硼矿二长花岗岩锆石LA－ICP－MS U－Pb年龄谐和图和加权平均年龄图解

    Figure 6. 

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收稿日期:  2022-03-20
修回日期:  2022-05-06
刊出日期:  2022-06-25

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