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内蒙古白云鄂博矿床年代学特征及其地质意义

陈彪 贾晓琪 魏威 金海龙

陈彪, 贾晓琪, 魏威, 金海龙. 内蒙古白云鄂博矿床年代学特征及其地质意义[J]. 地质科技通报, 2024, 43(1): 63-73. doi: 10.19509/j.cnki.dzkq.tb20230255
引用本文: 陈彪, 贾晓琪, 魏威, 金海龙. 内蒙古白云鄂博矿床年代学特征及其地质意义[J]. 地质科技通报, 2024, 43(1): 63-73. doi: 10.19509/j.cnki.dzkq.tb20230255
CHEN Biao, JIA Xiaoqi, WEI Wei, JIN Hailong. Characteristics and geological significance of geochronologic results from the Bayan Obo deposit, Inner Mongolia[J]. Bulletin of Geological Science and Technology, 2024, 43(1): 63-73. doi: 10.19509/j.cnki.dzkq.tb20230255
Citation: CHEN Biao, JIA Xiaoqi, WEI Wei, JIN Hailong. Characteristics and geological significance of geochronologic results from the Bayan Obo deposit, Inner Mongolia[J]. Bulletin of Geological Science and Technology, 2024, 43(1): 63-73. doi: 10.19509/j.cnki.dzkq.tb20230255

内蒙古白云鄂博矿床年代学特征及其地质意义

doi: 10.19509/j.cnki.dzkq.tb20230255
基金项目: 

国家重点研发计划"战略性矿产资源开发利用"重点专项项目 2021YFC2901704

内蒙古自治区自然科学基金面上项目 2021MS04004

白云鄂博稀土资源与综合利用国家重点实验室专项 2022Z2406

白云鄂博稀土资源与综合利用国家重点实验室专项 2021Z2349

详细信息
    作者简介:

    陈彪, E-mail: 2413375236@qq.com

    通讯作者:

    金海龙, E-mail: 1609244818@qq.com

  • 中图分类号: P618.7;P597

Characteristics and geological significance of geochronologic results from the Bayan Obo deposit, Inner Mongolia

More Information
  • 摘要:

    内蒙古白云鄂博矿床是世界罕见的特大型REE-Nb-Fe多金属共生矿床,由于经历了复杂的区域地质演化历史,至今仍对稀土成矿时代认识不一。基于前人的同位素年代学研究成果,结合矿床地质特征对稀土成矿时代进行讨论。研究表明,白云鄂博矿区经历了华北克拉通2.5~1.8 Ga的前寒武纪构造演化过程;哥伦比亚超大陆裂解的最后阶段,约1.3 Ga在白云鄂博裂谷形成了巨型稀土矿床,与同期碳酸岩墙形成时代一致;受后期华北克拉通北缘古亚洲洋俯冲碰撞造山的影响,白云鄂博地区引发热液交代活动,形成了晚期稀土矿脉和原有稀土矿物的重结晶,导致H8赋矿白云岩同位素系统受到扰动,呈现出多期次(1.0~0.2 Ga)的同位素年龄结果。总之,白云鄂博是一个在约1.3 Ga裂谷成矿并叠加了加里东和海西2期热扰动事件的巨型稀土矿床。

     

  • 图 1  内蒙古白云鄂博矿区地质图(据文献[7]略修改)

    Figure 1.  Geological map of Bayan Obo ore deposit, Inner Mongolia

    图 2  白云鄂博矿区野外露头及岩心照片

    a.白云鄂博东矿南部基底麻粒岩;b.H8白云岩钻井岩心;c.碳酸岩脉;d.Wu-dyke中霓长岩,含大量氟碳铈矿稀土矿物

    Figure 2.  Field photographs and core image of the Bayan Obo ore deposit

    图 3  白云鄂博矿区同位素年龄数据累计频数分布直方图

    Figure 3.  Cumulative frequency diagram and fitting curves of isotopic ages of the Bayan Obo deposit

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出版历程
  • 收稿日期:  2022-06-20
  • 录用日期:  2022-07-30
  • 修回日期:  2022-07-28

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