| 广东惠来地区早—中侏罗世桥源组海平面相对升降及构造背景的元素地球化学证据 |
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| 引用本文： | 许中杰,程日辉,王嘹亮,张莉,李飞.广东惠来地区早—中侏罗世桥源组海平面相对升降及构造背景的元素地球化学证据[J].吉林大学学报(地球科学版),2011,41(4):966-975,982. |
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| 作者姓名： | 许中杰 程日辉 王嘹亮 张莉 李飞 |
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| 作者单位： | 吉林大学地球科学学院,长春,130061;广州海洋地质调查局,广州,510075 |
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| 基金项目： | 国家自然科学基金项目(40972074); 吉林大学平台基地建设项目(450060445181,450060441018) |
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| 摘 要： | 惠来葵潭地区早—中侏罗世桥源组以海相和过渡相沉积为主。对样品进行全岩分析和ICP-MS微量元素分析,常量、微量元素及其比值反映的古盐度高低与古水深的深浅变化受海平面变化升降影响,具正相关。利用反映古盐度和古水深的m值、Sr/Ba、Ca/Mg、B/Ga和Rb/K曲线编制了桥源组海平面相对变化曲线。桥源组显示2次海侵的沉积旋回,海侵发生在桥源组中下部和中上部时期。对样品进行ICP-MS稀土元素分析和砂岩矿物成分分析,根据稀土元素分布模式图和La/Yb-∑REE源岩判别图解判断,桥源组源岩主要来自上地壳的沉积岩、玄武岩和花岗岩。根据Dickinson图解、Zr-Th、La-Th-Sc、Th-Co-Zr/10判别图解和稀土元素特征值综合分析,构造背景为弧后挤压盆地,具有大陆岛弧的特性,但少有被动大陆边缘成分。物源来自于火山弧造山带。
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| 关 键 词： | 惠来地区 早—中侏罗世 桥源组 海平面变化 元素地球化学 构造背景 |
Relative Change of Sea-Level and Element Geochemistry Evidence of Tectonic Setting During Early or Middle Jurassic in Qiaoyuan Formation of Huilai Area in Guangdong Province |
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| XU Zhong-jie,CHENG Ri-hui,WANG Liao-liang,ZHANG Li,LI Fei.Relative Change of Sea-Level and Element Geochemistry Evidence of Tectonic Setting During Early or Middle Jurassic in Qiaoyuan Formation of Huilai Area in Guangdong Province[J].Journal of Jilin Unviersity:Earth Science Edition,2011,41(4):966-975,982. |
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| Authors: | XU Zhong-jie CHENG Ri-hui WANG Liao-liang ZHANG Li LI Fei |
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| Institution: | XU Zhong-jie1,CHENG Ri-hui1,WANG Liao-liang2,ZHANG Li2,LI Fei11.College of Earth Sciences,Jilin University,Changchun 130061,China2.Guangzhou Bureau of Marine Geology Survey,Guangzhou 510075,China |
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| Abstract: | The marine and transitional sediments were dominated during Early or Middle Jurassic in the Qiaoyuan Formation of Kuitan area in Huilai.The samples were analyzed by the whole rock analysis and the ICP-MS trace elements analysis.The paleosalinity and the change of water depth are showed by the main and trace elements and their ratios,which are impacted by the change of sea-level and positively correlated.Using the values which reflect the paleosalinity and the water depth of m,Sr/Ba,Ca/Mg,B/Ga and Rb/K,the c... |
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| Keywords: | Huilai area Early-Middle Jurassic Qiaoyuan Formation change of sea-level element geochemistry tectonic setting |
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