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    云开地块东缘寒武系-泥盆系不整合界面上下的碎屑锆石U-Pb年代学记录及对物源转换的响应

    王志宏 杨文强 周岱 牛志军 何垚砚 宋芳

    王志宏, 杨文强, 周岱, 牛志军, 何垚砚, 宋芳, 2018. 云开地块东缘寒武系-泥盆系不整合界面上下的碎屑锆石U-Pb年代学记录及对物源转换的响应. 地球科学, 43(11): 4193-4203. doi: 10.3799/dqkx.2018.242
    引用本文: 王志宏, 杨文强, 周岱, 牛志军, 何垚砚, 宋芳, 2018. 云开地块东缘寒武系-泥盆系不整合界面上下的碎屑锆石U-Pb年代学记录及对物源转换的响应. 地球科学, 43(11): 4193-4203. doi: 10.3799/dqkx.2018.242
    Wang Zhihong, Yang Wenqiang, Zhou Dai, Niu Zhijun, He Yaoyan, Song Fang, 2018. Detrital Zircon U-Pb Geochronological Records and Its Response of Provenance Transformation of Strata Surrounding Cambrian-Devonian Unconformity in Eastern Margin of Yunkai Massif. Earth Science, 43(11): 4193-4203. doi: 10.3799/dqkx.2018.242
    Citation: Wang Zhihong, Yang Wenqiang, Zhou Dai, Niu Zhijun, He Yaoyan, Song Fang, 2018. Detrital Zircon U-Pb Geochronological Records and Its Response of Provenance Transformation of Strata Surrounding Cambrian-Devonian Unconformity in Eastern Margin of Yunkai Massif. Earth Science, 43(11): 4193-4203. doi: 10.3799/dqkx.2018.242

    云开地块东缘寒武系-泥盆系不整合界面上下的碎屑锆石U-Pb年代学记录及对物源转换的响应

    doi: 10.3799/dqkx.2018.242
    基金项目: 

    中国地质调查局项目 121201209000160035

    中国博士后科学基金项目 2017M612537

    国家自然科学基金项目 41772019

    详细信息
      作者简介:

      王志宏(1988-), 男, 博士后, 主要从事生物地层学研究

    • 中图分类号: P56

    Detrital Zircon U-Pb Geochronological Records and Its Response of Provenance Transformation of Strata Surrounding Cambrian-Devonian Unconformity in Eastern Margin of Yunkai Massif

    • 摘要: 云开地块东缘粤西圭岗镇附近寒武系之上不整合覆盖一套灰白色石英砾岩-含砾砂岩,由于缺乏化石和年龄依据,这套岩石的时代长期存有争议.利用LA-ICP-MS U-Pb测年手段,对该套含砾碎屑沉积岩及其上下层位进行了U-Pb测年,4件样品共获得300组有效数据,年龄变化于2 900~400 Ma,不整合面之下样品主要集中于1 100~700 Ma,不整合面之上最年轻碎屑锆石年龄集中于450~400 Ma.新的测年数据结合前人研究成果表明,云开地块东缘不整合面下伏及上覆地层的时代分别为寒武纪和泥盆纪.研究区寒武纪时期物源特征与印度、东南极洲和澳大利亚西部相似,指示该时期研究区同冈瓦纳东北缘相连,物源来自东冈瓦纳北缘南极洲、印度地块和澳大利亚之间的造山带,而泥盆纪物源主要来自邻近的云开地块.寒武系和泥盆系之间的不整合面是早古生代郁南运动与广西运动叠加的产物.

       

    • 图  1  华南(a)及粤西圭岗镇(b)地质简图与采样位置

      图a据Wang et al.(2013a)修改

      Fig.  1.  Simplified geological map of South China and Guigang, West Guangdong showing the sampling locations

      图  2  样品采集处景观照

      地质锤长度约30 cm,记号笔长度约15 cm

      Fig.  2.  Landscape at the sample collection site

      图  3  研究区寒武系-泥盆系地层柱状图及样品镜下显微照片

      1.砂岩;2.石英砂岩;3.岩屑石英砂岩;4.砾岩;5.泥质砂岩;6.长石砂岩;7.变质砂岩;8.变质长石石英砂岩;9.炭质千枚岩;L.岩屑;Q.石英;Ser.绢云母

      Fig.  3.  Stratigraphic column of the Cambrian to Devonian strata and microphotographs of each sample in the studied section in Guigang, West Guangdong

      图  4  广东圭岗镇寒武系(PM6-72, PM6-186)和上覆争议地层(PM6-187, MN-6)碎屑锆石阴极发光图像及分析点表面年龄

      Fig.  4.  Cathodoluminescence images with analytical spots and corresponding apparent ages of detrital zircons from the Cambrian and overlying disputed strata in Guigang, West Guangdong

      图  5  圭岗剖面寒武系和泥盆系LA-ICP-MS碎屑锆石U-Pb谐和曲线

      n=70/80”表示一致年龄和总测试数量之比,一致性区间为90%~110%,年龄显示为1σ不确定性

      Fig.  5.  LA-ICP-MS zircon U-Pb concordia age plots of Cambrian and Devonian samples from the Guigang Section

      图  6  圭岗镇寒武系和泥盆系样品碎屑锆石年龄直方图

      Fig.  6.  Age histograms of zircons of rocks from the Cambrian and Devonian strata in Guigang, West Guangdong

      图  7  研究区及相邻地体碎屑锆石U-Pb年龄谱对比

      图c~d数据来自文献Xu et al.(2014);图e~f数据来自李献华等(2012);图g年龄数据来自文献Goodge et al.(2004);图h~i年龄数据来自文献Xu et al.(2013)

      Fig.  7.  Compilation of detrital zircon distributions from Guigang, West Guangdong (this study) and other areas around the world

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