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    北秦岭寨根地区富铌辉长岩地球化学特征及其构造意义

    赵利刚 李承东 许雅雯 武志宇 常青松 许腾 滕雪明

    赵利刚, 李承东, 许雅雯, 武志宇, 常青松, 许腾, 滕雪明, 2019. 北秦岭寨根地区富铌辉长岩地球化学特征及其构造意义. 地球科学, 44(1): 135-144. doi: 10.3799/dqkx.2018.340
    引用本文: 赵利刚, 李承东, 许雅雯, 武志宇, 常青松, 许腾, 滕雪明, 2019. 北秦岭寨根地区富铌辉长岩地球化学特征及其构造意义. 地球科学, 44(1): 135-144. doi: 10.3799/dqkx.2018.340
    Zhao Ligang, Li Chengdong, Xu Yawen, Wu Zhiyu, Chang Qingsong, Xu Teng, Teng Xueming, 2019. Geochemistry of Nb-Enriched Gabbros in Zhaigen Area in Northern Qinling and Their Tectonic Significance. Earth Science, 44(1): 135-144. doi: 10.3799/dqkx.2018.340
    Citation: Zhao Ligang, Li Chengdong, Xu Yawen, Wu Zhiyu, Chang Qingsong, Xu Teng, Teng Xueming, 2019. Geochemistry of Nb-Enriched Gabbros in Zhaigen Area in Northern Qinling and Their Tectonic Significance. Earth Science, 44(1): 135-144. doi: 10.3799/dqkx.2018.340

    北秦岭寨根地区富铌辉长岩地球化学特征及其构造意义

    doi: 10.3799/dqkx.2018.340
    基金项目: 

    中国地质调查局地质矿产调查项目 DD20160043

    国家自然科学基金项目 41272065

    详细信息
      作者简介:

      赵利刚(1981-), 男, 助理研究员, 主要从事区域成矿规律研究

      通讯作者:

      李承东

    • 中图分类号: P597

    Geochemistry of Nb-Enriched Gabbros in Zhaigen Area in Northern Qinling and Their Tectonic Significance

    • 摘要: 富铌辉长岩往往与高镁闪长岩、埃达克岩共生,被认为是具有指相意义的岩石构造组合,但豫西地区北秦岭造山带南侧该类岩浆活动却很少被发现.对寨根地区秦岭岩群中的斜长角闪岩类进行岩石学、地球化学、同位素地球化学和年代学研究,在该深成杂岩中发现了富铌辉长岩,并且测得富铌辉长岩的变质锆石U-Pb年龄为484.3±1.8 Ma,与区内超高压榴辉岩变质峰值年龄相近.富铌辉长岩地球化学特征表现为富集Rb、Th等大离子亲石元素,亏损Nb、Ta、P等高场强元素,εNdt)介于-1.61~+0.49,相应的(87Sr/86Sr)i范围为0.714 273~0.723 936.推测其成因与秦岭古陆壳深俯冲过程中部分熔融的板片熔体交代地幔楔橄榄岩再熔融有关,经受深俯冲时有大量陆壳物质的加入,该发现为秦岭造山带早古生代早期存在多个微陆块提供了证据.

       

    • 图  1  豫西地区地质略图

      万渝生等(2011)

      Fig.  1.  Geological sketch of West Henan

      图  2  富铌辉长岩野外及镜下照片

      Qz.石英;Pl.斜长石;Hb.角闪石

      Fig.  2.  Field and microscopic features of Nb-enriched gabbros

      图  3  富铌辉长岩代表性锆石CL图像及测点位置

      Fig.  3.  Representative CL images and dating spots of Nb-enriched gabbros

      图  4  富铌辉长岩锆石U-Pb谐和图

      Fig.  4.  Concordia diagrams plot of the zircons U-Pb data of Nb-enriched gabbros

      图  5  富铌辉长岩类Zr/TiO2-Nb/Y图解

      Fig.  5.  Zr/TiO2-Nb/Y diagram of Nb-enriched gabbros

      图  6  富铌辉长岩MgO-Nb/La (a)和Nb-Nb/U (b)判别图解

      底图据Kepezhinskas et al.(1996)

      Fig.  6.  MgO vs. Nb/La (a) and Nb vs. Nb/U (b) for the Nb-enriched gabbros

      图  7  富铌辉长岩稀土元素配分模式图(a)及微量元素蛛网图(b)

      球粒陨石和原始地幔标准化值均据Sun and McDonough(1989)

      Fig.  7.  Chondrite-normalized REE distribution patterns (a) and primitive mantle-normalized spidergrams (b) for Nb-enriched gabbros

      图  8  富铌辉长岩Th/Yb-Ta/Yb判别图(a)和Sr-Nd同位素组成图解(b)

      Fig.  8.  Th/Yb-Ta/Yb diagram (a) and Sr-Nd isotopic diagram (b) of Nb-enriched gabbros

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