冀东柳江地区新太古代晚期黑云母二长花岗岩地球化学特征、成岩年龄及其地质意义研究
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本文为矿山重大灾害防治与环境修复协同创新中心开放课题(编号:CXZX- 2024- 02);西北大学大陆动力学国家重点实验室开放课题基金(编号: 22LCD11);第73批中国博士后基金面上项目(编号:2023M732837),国家自然科学基金资助项目(编号:41872194, U2244211)的成果


Study on geochemical characteristics, rock forming age and geological significance of late Neoarchean biotite monzonite in Liujiang area, eastern Hebei
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  • 1) 辽宁工程技术大学矿业学院,矿山重大灾害防治与环境修复协同创新中心,辽宁阜新, 123000    
  • 1) 辽宁工程技术大学矿业学院,矿山重大灾害防治与环境修复协同创新中心,辽宁阜新, 123000;2) 西北大学地质系,西安, 710000    
  • 1) 辽宁工程技术大学矿业学院,矿山重大灾害防治与环境修复协同创新中心,辽宁阜新, 123000    
  • 3) 吉林大学地球科学学院,长春, 130026    
  • 3) 吉林大学地球科学学院,长春, 130026    
  • 2) 西北大学地质系,西安, 710000    
  • 1) College of Mining Engineering, Liaoning Technical University, Collaborative Innovation Center for Mine Major Disaster Prevention and Environmental Restoration, Fuxin Liaoning, 123000    
  • 1) College of Mining Engineering, Liaoning Technical University, Collaborative Innovation Center for Mine Major Disaster Prevention and Environmental Restoration, Fuxin Liaoning, 123000;2) College of Geology, Northwest University, Xian, 710000    
  • 1) College of Mining Engineering, Liaoning Technical University, Collaborative Innovation Center for Mine Major Disaster Prevention and Environmental Restoration, Fuxin Liaoning, 123000    
  • 3) College of Earth Sciences, Jilin University, Changchun, 130026    
  • 3) College of Earth Sciences, Jilin University, Changchun, 130026    
  • 2) College of Geology, Northwest University, Xian, 710000    
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    摘要:

    冀东柳江地区广泛发育新太古代花岗岩,是解决研究华北克拉通东部陆块早期陆壳的形成与演化的关键所在,因此受到众多学者的广泛关注。本文对柳江地区的黑云母二长花岗岩进行地质、地球化学特征、锆石U- Pb年代学及Sr—Nd同位素地球化学方面的研究,旨在确定其成因及大地构造意义。通过LA- ICP- MS锆石U- Pb定年获得岩石形成年龄为(2559±25)Ma,形成于新太古代晚期;全岩岩石地球化学分析表明其为准铝质—弱过铝质、高钾钙碱性系列钾质岩石,富集大离子亲石元素(LILE, 例如: Rb、Ba),亏损高场强元素(HFSE, 例如: Nb、Ta、Ti),具有轻稀土富集和重稀土亏损的右倾型配分模式,Eu异常不明显;\[n(87Sr)/ n(86Sr)\]i为0. 701172~0. 701412,\[n(143Nd)/ n(144Nd)\]i值为0. 509341~0. 509375,εNd(t) 值为0. 4~1. 1的特点。结合已有研究成果,认为本次研究的黑云母二长花岗岩具有典型的I型花岗岩地球化学特征,成岩过程中存在幔源物质的加入,形成于活动大陆边缘弧—陆碰撞造山后伸展的岛弧环境。

    Abstract:

    The neocarchean granite is widely developed in the Liujiang area of eastern Hebei, which is the key to solve the study of the formation and evolution of the early continental crust in the east of North China Craton, so it has been widely concerned by many scholars. This paper studies the geological, geochemical characteristics, zircon U- Pb dating and Sr—Nd isotope geochemistry of biotite monzogranite in Liujiang area, aiming to determine its origin and geotonic significance. The rock formation age of (2559±25) Ma was obtained by LA- ICP- MS Zircon U- Pb dating, formed in the late Neocarchean; The geochemical analysis of the whole rock shows that it is quasi- aluminum—weak overaluminum, high potassium calcium- alkaline series potassium rock, Enrichment of large ion lithoophilin (LILE, for instance: Rb, Ba), Loss of high field strength element (HFSE, for instance: Nb, Ta, Ti), The right- leaning distribution pattern with light rare earth enrichment and heavy rare earth loss, The Eu abnormalities are not obvious; \[n(87Sr)/ n(86Sr)\]i value ranged from 0.701172 to 0.701412, The \[n(143Nd)/n(144Nd)\]i value ranged from 0.509341 to 0.509375, Characteristics of a εNd(t) value of 0.4~1.1. Combined with the existing research results, it is believed that the biotite granite in this study has the typical geochemical characteristics of type I granite. There is the addition of mantle source material in the diagenetic process, which is formed in the island arc environment after the arc formation of the active continental edge—land collision.

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陈湘智,石强,舒润霄,徐仲元,李世超,陈开运.2025.冀东柳江地区新太古代晚期黑云母二长花岗岩地球化学特征、成岩年龄及其地质意义研究[J].地质论评,70(2):2025020017,[DOI].
CHEN Xiangzhi, SHI Qiang, SHU Runxiao, XU Zhonyuan, LI Shichao, CHEN Kaiyun.2025. Study on geochemical characteristics, rock forming age and geological significance of late Neoarchean biotite monzonite in Liujiang area, eastern Hebei[J]. Geological Review,70(2):2025020017.

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  • 收稿日期:2025-01-20
  • 最后修改日期:2025-04-11
  • 在线发布日期: 2024-03-20
  • 出版日期: 2024-03-15