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    扬子克拉通北缘神农架地区矿石山组Pb-Pb等时线年龄及其地质意义

    卢山松 邱啸飞 谭娟娟 吕红 杨红梅 王志先 钟权

    卢山松, 邱啸飞, 谭娟娟, 吕红, 杨红梅, 王志先, 钟权, 2016. 扬子克拉通北缘神农架地区矿石山组Pb-Pb等时线年龄及其地质意义. 地球科学, 41(2): 317-324. doi: 10.3799/dqkx.2016.023
    引用本文: 卢山松, 邱啸飞, 谭娟娟, 吕红, 杨红梅, 王志先, 钟权, 2016. 扬子克拉通北缘神农架地区矿石山组Pb-Pb等时线年龄及其地质意义. 地球科学, 41(2): 317-324. doi: 10.3799/dqkx.2016.023
    Lu Shansong, Qiu Xiaofei, Tan Juanjuan, Lü Hong, Yang Hongmei, Wang Zhixian, Zhong Quan, 2016. The Pb-Pb Isochron Age of the Kuangshishan Formation in Shennongjia Area on the Northern Margin of the Yangtze Craton and Its Geological Implications. Earth Science, 41(2): 317-324. doi: 10.3799/dqkx.2016.023
    Citation: Lu Shansong, Qiu Xiaofei, Tan Juanjuan, Lü Hong, Yang Hongmei, Wang Zhixian, Zhong Quan, 2016. The Pb-Pb Isochron Age of the Kuangshishan Formation in Shennongjia Area on the Northern Margin of the Yangtze Craton and Its Geological Implications. Earth Science, 41(2): 317-324. doi: 10.3799/dqkx.2016.023

    扬子克拉通北缘神农架地区矿石山组Pb-Pb等时线年龄及其地质意义

    doi: 10.3799/dqkx.2016.023
    基金项目: 

    中国地质调查局项目 1212011121102

    中国地质调查局项目 Nos.12120114005701

    国家自然科学基金青年基金 No.41303026

    详细信息
      作者简介:

      卢山松(1986-),男,助理研究员,硕士,主要从事同位素地球化学和岩石地球化学研究. E-mail: luyin_student@163.com

    • 中图分类号: P581

    The Pb-Pb Isochron Age of the Kuangshishan Formation in Shennongjia Area on the Northern Margin of the Yangtze Craton and Its Geological Implications

    • 摘要: 扬子克拉通北缘神农架地区出露了大量中元古代碳酸盐岩地层,但已有的同位素年代学资料有限,故对神农架群矿石山组白云岩开展了全岩Pb-Pb等时线测年.研究结果表明,矿石山组白云岩206Pb/204Pb变化范围相对较大,为18.753~23.106,而207Pb/204Pb和208Pb/204Pb则变化范围相对较小,分别为15.606~16.046和37.793~38.599.八件白云岩样品206Pb/204Pb和207Pb/204Pb之间呈良好的线性关系,构成Pb-Pb等时线年龄为1632±75Ma(MSWD=8.7),代表了矿石山组地层主体沉积时代,与已有的年代学结果可对应,表明Pb-Pb同位素体系可对古老的碳酸盐岩地层进行较为精确地定年.结合前人对于神农架群的年代学资料,确定神农架群的沉积时限应为1600~1100Ma的中元古代.

       

    • 图  1  神农架地区地质简图

      Qiu et al.(2011) 修改

      Fig.  1.  Geological sketch of Shennongjia region

      图  2  神农架地区中元古代地层柱状图及采样点位

      1.砾岩;2.砂砾岩;3.砂岩;4.粉砂岩;5.页岩/板岩;6.燧石;7.石灰岩;8.白云岩;9.角砾状白云岩;10.硅质条带白云岩;11.叠层石白云岩;12.火山岩;13.凝灰岩;14.整合接触关系;15.平行不整合接触关系;16.采样点;据李怀坤等(2013) 修改

      Fig.  2.  Mesoproterozoic stratigraphic histogram of the Shennongjia area and the sampling locations of the Kuangshishan Formation

      图  3  神农架群矿石山组Pb-Pb等时线

      Fig.  3.  Pb-Pb isochron of carbonate rocks from the Kuangshishan Formation, Shennongjia Group

      表  1  神农架群矿石山组Pb同位素组成

      Table  1.   Pb isotope compositions of carbonate rocks from the Kuangshishan Formation, Shennongjia Group

      序号样号岩性206Pb/204Pb2δ207Pb/204Pb2δ208Pb/204Pb2δ
      112SNJ-72块状白云岩19.0380.00515.6410.00438.1350.006
      212SNJ-73含黑色叠层石白云岩19.7740.00515.7070.00437.8970.008
      312SNJ-75块状白云岩18.7530.00215.6060.00237.7930.004
      412SNJ-76块状白云岩20.3220.00715.7400.00638.3410.009
      512SNJ-77含黑色叠层石白云岩18.4330.00415.6250.00438.2410.010
      612SNJ-78泥质条带白云岩23.1060.00316.0460.00238.1000.005
      712SNJ-81泥质条带白云岩19.6210.00515.7110.00438.0160.007
      812SNJ-83含叠层石白云岩19.7860.00615.7190.00838.5990.003
      912SNJ-84块状白云岩21.0760.00515.8300.00438.1140.001
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