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    长江中下游地区白垩纪富碱火山岩浆作用

    禹尧 徐夕生

    禹尧, 徐夕生, 2009. 长江中下游地区白垩纪富碱火山岩浆作用. 地球科学, 34(1): 105-116.
    引用本文: 禹尧, 徐夕生, 2009. 长江中下游地区白垩纪富碱火山岩浆作用. 地球科学, 34(1): 105-116.
    YU Yao, XU Xi-sheng, 2009. Cretaceous Alkali-Rich Magmatism in the Middle and Lower Reaches of the Yangtze River. Earth Science, 34(1): 105-116.
    Citation: YU Yao, XU Xi-sheng, 2009. Cretaceous Alkali-Rich Magmatism in the Middle and Lower Reaches of the Yangtze River. Earth Science, 34(1): 105-116.

    长江中下游地区白垩纪富碱火山岩浆作用

    基金项目: 

    国家自然科学基金项目 40730313

    国家重点基础研究发展规划项目 2006CB403508

    详细信息
      作者简介:

      禹尧(1985—).女.硕士研究生.岩石学专业

      通讯作者:

      徐夕生, E-mail: xsxu@nju.edu.cn

    • 中图分类号: P588

    Cretaceous Alkali-Rich Magmatism in the Middle and Lower Reaches of the Yangtze River

    • 摘要: 根据长江中下游地区中生代火山岩与成矿作用的研究现状, 选择研究工作较为薄弱的、最东端的溧水盆地火山岩为研究对象, 进行了详细的锆石U-Pb同位素分析, 并结合本区4个不同中生代火山盆地火山岩地球化学、岩性地层学资料, 对各盆地中4个火山旋回的火山岩进行了对比研究.研究表明: 溧水盆地龙王山组粗面岩的结晶年龄为128Ma, 这标志着长江中下游地区由西向东中生代火山作用的全面展开.4个火山旋回的时代分别为: > 125Ma、125~120Ma、120~110Ma和110~90Ma.庐枞盆地的浮山组与宁芜盆地的姑山组+娘娘山组(即溧水盆地的观山组+甲山组) 对应较为恰当, 应属第三火山旋回.本区白垩世火山岩的地球化学特征, 反映这些幔源碱性岩浆在上升过程中受到了陆壳物质的混染, 早期火山岩(如溧水盆地龙王山组) 则是Sr矿的矿源层.

       

    • 图  1  长江中下游地区晚中生代火山岩盆地分布示意图(据倪若水等, 1998修改)

      Fig.  1.  Sketch map showing distributions of Late Mesozoic volcanic basins in the middle-lower Yangtze area

      图  2  溧水盆地地质简图(a) (据常州幅1∶20万地质图修改); (b) 为溧水盆地中生代火山岩岩性柱状图(据江苏省及上海市区域地质志, 1984); (c) 为采样剖面图

      Fig.  2.  Geological sketch map of the Lishui basin

      图  3  溧水盆地龙王山组粗面岩中代表性锆石的CL图像

      Fig.  3.  Cathodoluminescence (CL) images of representative zircons from trachyte of the Longwangshan Formation, Lishui basin

      图  4  溧水盆地龙王山组粗面岩中锆石谐和曲线图解

      Fig.  4.  Zircon U-Pb concordia diagram for trachyte from the Longwangshan Formation of Lishui basin

      图  5  长江中下游地区白垩纪各火山岩盆地火山岩年龄分布图

      图中溧水盆地火山岩年龄128 Ma来自本文; 其他数据来源: 宁芜项目编写小组, 1978; Wang and McDongau, 1980; 中科院地质研究所火山岩组, 1980;胡华光等, 1982; 李坤英, 1982; 吴利仁, 1984; McKee, 1988; 周金城等, 1994; 岳文浙等, 1999; 刘洪等, 2002; 张旗等, 2003; 楼亚儿和杜杨松, 2006

      Fig.  5.  Distribution diagram of the ages of Cretaceous volcanics from separated basins in the middle-lower Yangtze area

      图  6  (a) 长江中下游地区白垩纪各盆地火山岩的K2O-SiO2图解(Peccerillo and Taylor, 1976); (b) K2O-Na2O图解(Turner et al., 1996)

      图中实心点代表各盆地龙王山组火山岩, 空心点则为各盆地其他旋回的火山岩.数据来源: 溧水盆地据李超文等, 2004高晓峰等(2007); 宁芜盆地据王元龙等, 2001;繁昌盆地据常常印佛等, 1991;庐枞盆地据刘洪等, 2002

      Fig.  6.  Composition of Cretaceous volcanics from separated basins in the middle-lower Yangtze area plotted in K2O vs. SiO2 (a) and K2O vs. Na2O (b) variation diagram

      图  7  长江中下游地区白垩纪各盆地火山岩Harker图解

      数据来源: 溧水盆地据李超文等, 2004高晓峰等(2007); 宁芜盆地据王元龙等, 2001; 繁昌盆地据常印佛等(1991); 庐枞盆地据刘洪等, 2002

      Fig.  7.  Harker diagrams of major elements of Cretaceous volcanics from separated basins in the middle-lower Yangtze area

      图  8  长江中下游地区白垩纪各盆地火山岩稀土配分曲线(球粒陨石标准值引自Taylor and McLennan (1985)

      图中黑色实线代表各盆地中龙王山组(或相当于龙王山组) 火山岩, 阴影部分代表后继其他组火山岩.数据来源: 溧水盆地据李超文等, 2004高晓峰等(2007); 宁芜盆地据王元龙等, 2001;庐枞盆地据刘洪等, 2002

      Fig.  8.  Chondrite-normalized REE pattern diagram for Cretaceous volcanics from separated basins in the middle-lower Yangtze area

      图  9  火山岩微量元素原始地幔归一化蛛网图解

      图中(a) 庐枞盆地; (b) 宁芜盆地; (c) 溧水盆地.原始地幔标准值引自McDonough and Sun (1995); 黑色实线代表各盆地中龙王山组(或相当于龙王山组) 火山岩, 阴影部分代表后继其他组火山岩.数据来源: 溧水盆地据李超文等(2004)高晓峰等(2007); 宁芜盆地据王元龙等(2001); 庐枞盆地据刘洪等(2002)

      Fig.  9.  Primitive mantle-normalized trace element diagram for Cretaceous volcanics

      表  1  溧水盆地龙王山组粗面岩中错石LA-ICPMS定年结果

      Table  1.   LA-ICPMS U-Pb data of zircons in the trachytes from the Longwangshan Formation of Lishui basin

      表  2  长江中下游地区白垩纪各盆地火山岩年龄资料

      Table  2.   Age data of Cretaceous volcanics from separated basins in the middle-lower Yangtze area

      表  3  长江中下游地区4个火山岩盆地火山岩系对比

      Table  3.   Comparisons of volcanic rock series from four separated basins in the middle-lower Yangtze area

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    • 收稿日期:  2008-10-17
    • 刊出日期:  2009-01-25

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