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    云开造山带强过铝深熔花岗岩地球化学、年代学及构造背景

    彭松柏 金振民 刘云华 付建明 何龙清 蔡明海 王彦斌

    彭松柏, 金振民, 刘云华, 付建明, 何龙清, 蔡明海, 王彦斌, 2006. 云开造山带强过铝深熔花岗岩地球化学、年代学及构造背景. 地球科学, 31(1): 110-120.
    引用本文: 彭松柏, 金振民, 刘云华, 付建明, 何龙清, 蔡明海, 王彦斌, 2006. 云开造山带强过铝深熔花岗岩地球化学、年代学及构造背景. 地球科学, 31(1): 110-120.
    PENG Song-bo, JIN Zhen-min, LIU Yun-hua, FU Jian-ming, HE Long-qing, CAI Ming-hai, WANG Yan-bin, 2006. Petrochemistry, Chronology and Tectonic Setting of Strong Peraluminous Anatectic Oanitoids in Yunkai Orogenic Belt, Western Guangdong Province, China. Earth Science, 31(1): 110-120.
    Citation: PENG Song-bo, JIN Zhen-min, LIU Yun-hua, FU Jian-ming, HE Long-qing, CAI Ming-hai, WANG Yan-bin, 2006. Petrochemistry, Chronology and Tectonic Setting of Strong Peraluminous Anatectic Oanitoids in Yunkai Orogenic Belt, Western Guangdong Province, China. Earth Science, 31(1): 110-120.

    云开造山带强过铝深熔花岗岩地球化学、年代学及构造背景

    基金项目: 

    国家自然科学基金项目 40072069

    中国地质调查局项目 200313000041

    详细信息
      作者简介:

      彭松柏(1963-), 男, 研究员, 主要研究方向为造山带花岗岩地质及区域成矿预测.E-mail:psb200301@yahoo.com.cn

    • 中图分类号: P588.12;P597

    Petrochemistry, Chronology and Tectonic Setting of Strong Peraluminous Anatectic Oanitoids in Yunkai Orogenic Belt, Western Guangdong Province, China

    • 摘要: 云开造山带条带—眼球状(环斑)深熔花岗岩(含紫苏花岗岩)地球化学和年代学的研究表明, 绝大多数花岗岩的A/CNK > 1.1, CaO/Na2O=0.62-1.61(平均0.94, 大于0.3), Al2O3/TiO=16.6-60.6(平均23.68), 高场强元素Ta、Nb、Zr亏损, 具大陆边缘俯冲-碰撞造山带后碰撞构造环境强过铝(SP)高钾钙碱性-钙碱性花岗岩的特征, 紫苏花岗岩和片麻状含榴黑云二长花岗岩Al2O3/TiO(平均17.82)明显低于条带-眼球状(环斑)黑云二长花岗岩Al2O3/TiO(平均29.55), 显示其形成温度更高, 并具A型花岗岩的演化特征.而且从高钾钙碱性条带-眼球状(环斑)黑云二长花岗岩到钙碱性紫苏花岗岩、片麻状含榴黑云二长花岗岩, 形成时代由(465±10)Ma、(467±10)Ma变为(435±11)Ma、(413±8)Ma, 表明扬子板块与华夏板块在加里东期发生了洋—陆俯冲—碰撞造山和后碰撞的伸展—拆沉—底侵岩浆岩作用, 并且后期又经历了海西—印支期挤压抬升和伸展揭顶作用的改造, 这也为华南存在加里东期扬子板块向华夏板块的洋-陆俯冲-碰撞造山提供了重要证据.

       

    • 图  1  云开地区地质构造略图

      1.新生界(Kz); 2.中生界(Mz); 3.古生界(Pz); 4.云开群(Pt3);5.高州表壳岩系(Pt1~2);6.燕山期花岗岩(γ5);7.海西—印支期花岗岩(γ4);8.加里东期花岗岩(γ3);9.地块边界断裂; 10.韧性剪切带; 11.变基性超基性岩; 12.采样位置; 13.测年样位置

      Fig.  1.  Geological sketch map of Yunkai area

      图  2  花岗岩K2O-SO2判别图解(Le Maitre et al., 1989; Rickwood, 1989)

      ○.紫苏花岗岩; □.眼球状黑云二长花岗岩; △.环斑黑云二长花岗岩; ◇.片麻状含榴黑云二长花岗岩

      Fig.  2.  K2O vs.SiO2 discriminant diagrams for the granitoids

      图  3  花岗岩Rb-(Y+Nb)判别图解和Rb-(Yb+Ta)判别图解(Pearce et al., 1984)

      VAG.火山弧花岗岩; Syn-COLG.同碰撞花岗岩; WPG.板内花岗岩; ORG.洋脊花岗岩; 其余图例同图 2

      Fig.  3.  Rb-(Y+Nb) and Rb-(Yb+Ta) tectonic discriminant diagrams for the granitoids

      图  4  花岗岩Hf-Rb-Ta判别图解(Harris et al., 1986; 图例同图 2)

      Fig.  4.  Hf-Rb-Ta tectonic discriminant diagrams for the granitoids

      图  5  云开地区花岗岩锆石的SHRIMP U-Pb年龄谐和图

      Fig.  5.  Zircon SHRIMP U-Pb concordia diagram of the granitoids from the Yunkai area

      表  1  云开地区花岗岩主量和微量元素地球化学分析数据

      Table  1.   Major (%) and trace(μg·g-1) element analyses of the granitoids from the Yunkai area

      表  2  云开地区花岗岩锆石SHRIMP U-Pb同位素分析数据

      Table  2.   SHRIMP U-Pb data of zircons of the granitoids from the Yunkai area

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