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区域化探数据在华南强烈风化区地质填图中的应用

吴俊 卜建军 谢国刚 彭兴芳

吴俊, 卜建军, 谢国刚, 等, 2016. 区域化探数据在华南强烈风化区地质填图中的应用. 地质力学学报, 22 (4): 955-966.
引用本文: 吴俊, 卜建军, 谢国刚, 等, 2016. 区域化探数据在华南强烈风化区地质填图中的应用. 地质力学学报, 22 (4): 955-966.
WU Jun, BU Jian-jun, XIE Guo-gang, et al., 2016. APPLICATION OF REGIONAL GEOCHEMICAL DATA IN GEOLOGICAL MAPPING IN STRONGLY WEATHERED AREA IN SOUTHERN CHINA. Journal of Geomechanics, 22 (4): 955-966.
Citation: WU Jun, BU Jian-jun, XIE Guo-gang, et al., 2016. APPLICATION OF REGIONAL GEOCHEMICAL DATA IN GEOLOGICAL MAPPING IN STRONGLY WEATHERED AREA IN SOUTHERN CHINA. Journal of Geomechanics, 22 (4): 955-966.

区域化探数据在华南强烈风化区地质填图中的应用

基金项目: 

中国地质调查局地质调查项目“特殊地质地貌区填图试点” DD20160060

“广东1:5万筋竹圩、泗纶圩、罗定县幅强烈风化区填图试点” 12120114005901

“珠三角阳江-珠海地区海岸带1:5万填图试点” DD20160064

详细信息
    作者简介:

    吴俊(1983-), 男, 湖北武汉人, 助理研究员, 硕士, 主要从事区域地质调查和地层古生物研究工作。E-mail:258155816@qq.com

    通讯作者:

    卜建军(1972-), 男, 高级工程师, 主要从事区域地质和地层古生物方面的研究工作。E-mail:jianjunbu@cug.edu.cn

  • 中图分类号: P623;P632

APPLICATION OF REGIONAL GEOCHEMICAL DATA IN GEOLOGICAL MAPPING IN STRONGLY WEATHERED AREA IN SOUTHERN CHINA

  • 摘要: 自区域化探全国扫面计划开始以来,区域化探数据在矿产勘查、环境、生态及农业等方面均发挥了很大作用,但对其在地质填图中的应用研究比较少。在中国南方花岗岩广泛分布的地区,化学风化强烈,风化层覆盖厚,植被发育,基岩裸露少,岩性识别和界线划分困难,严重影响了填图的速度和精度。通过对区域化探数据的处理分析,筛选特征指示元素编制地球化学图,发现对侵入岩体具明显指示的元素地球化学分区。通过野外实地验证,元素地球化学分区可以揭示不同期次侵入体的分布范围,利用元素地球化学分区可以有效提高强风化区地质填图的效率和精度。

     

  • 图  1  研究区地质图

    Figure  1.  Geological map of the study area

    图  2  研究区K2O地球化学图

    Figure  2.  Geochemical map of K2O in the study area

    图  3  研究区Li地球化学图

    Figure  3.  Geochemical map of Li in the study area

    图  4  研究区U地球化学图

    Figure  4.  Geochemical map of U in the study area

    图  5  研究区La地球化学图

    Figure  5.  Geochemical map of La in the study area

    图  6  研究区Y地球化学图

    Figure  6.  Geochemical map of Y in the study area

    图  7  研究区Zr地球化学图

    Figure  7.  Geochemical map of Zr in the study area

    图  8  6元素地球化学侵入体推断图

    Figure  8.  Inferred intrusive rocks according to six elements

    图  9  生江镇婆髻山白垩系花岗斑岩(照片镜向100°)

    Figure  9.  Photos of the Cretaceous Granite porphyry at Shengjiang Town

    表  1  研究区侵入岩填图单位一览

    Table  1.   Mapping units for intrusive rocks in the study area

    地质时代代号岩性
    构造旋回
    燕山期白垩纪晚白垩世ηγK2花岗斑岩
    早白垩世γπK2中粒黑云母二长花岗岩
    侏罗纪晚侏罗世ηγJ3中粒斑状黑云母二长花岗岩
    早侏罗世ηγJ1中粒斑状角闪黑云母二长花岗岩
    γδJ1细粒角闪花岗闪长岩
    海西—印支期三叠纪中三叠世ηγT2红柱石堇青石黑云母二长花岗岩
    早三叠世ηγT1弱片麻状中细粒(斑状)二长花岗岩
    二叠纪晚二叠世γδP3片麻状细粒花岗闪长岩
    δοβP3中粒黑云母英云闪长岩
    加里东期志留纪早志留世ηγS1条带状细粒黑云母二长花岗岩
    下载: 导出CSV

    表  2  元素地球化学特征

    Table  2.   Geochemical characteristics of the selected elements

    元素最小值最大值XSX-3SX-2SX-SX+SX+2SX+3SF(X±S)F(X±2S)F(X±3S)
    K2O0.124.272.010.70-0.090.611.312.713.414.1174.4294.8498.04
    Li8.7078.5328.1014.33-14.89-0.5613.7742.4356.7671.0982.2193.5996.79
    U0.2512.804.252.48-3.19-0.711.776.739.2111.6978.4795.0298.22
    La3.00131.1752.1622.99-16.816.1829.1775.1598.14121.1377.0494.4897.33
    Y5.0082.8530.0514.78-14.290.4915.2744.8359.6174.3977.4194.8597.70
    Zr81.00877.00417.81140.58-3.93136.65277.23558.39698.97839.5576.1693.6097.87
    注:样本数N=562;X—均值; S—标准方差; F(X±S)—落入X±S的频率, %; K2O单位为%, 其他为10-6
    下载: 导出CSV

    表  3  不同时代侵入岩地球化学判别表

    Table  3.   Geochemical characteristics of intrusive rocks in different ages

    侵入岩K2O/%Li/10-6U/10-6La/10-6Y/10-6Zr/10-6
    加里东期(ηγS1, 泗纶岩体)1.55~2.0<323.75~5.0>60<24>420
    海西—印支期(γT, 那蓬岩体)>2.0>40>5.0>60>32>420
    燕山早期(γJ, 筋竹岩体)>2.9<32>5.0>60>32>420
    燕山晚期(γK2, 八帘山岩体)1.55~2.0>40<3.75<24>32<240
    下载: 导出CSV
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