[1]周 云,梁新权,梁细荣.2015.海南白垩纪六罗村组火山岩的年代学、地球化学特征及其大地构造意义.大地构造与成矿学,39(5):903-918.doi:10.16539/j.ddgzyckx.2015.05.013
 ZHOU Yun,LIANG Xinquan,LIANG Xirong.2015.Geochronology and Geochemistry of Cretaceous Volcanic Rocks from Liuluo Formation in Hainan Island and Their Tectonic Implications.Geotectonica et Metallogenia,39(5):903-918.doi:10.16539/j.ddgzyckx.2015.05.013
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海南白垩纪六罗村组火山岩的年代学、地球化学特征及其大地构造意义
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《大地构造与成矿学》[ISSN:ISSN 1001-1552/CN:CN 44-1595/P]

卷:
期数:
2015年39卷05期
页码:
903-918
栏目:
岩石大地构造与地球化学
出版日期:
2015-11-10

文章信息/Info

Title:
Geochronology and Geochemistry of Cretaceous Volcanic Rocks from Liuluo Formation in Hainan Island and Their Tectonic Implications
作者:
周 云1 2 梁新权2 梁细荣2
1.桂林理工大学 地球科学学院, 广西 桂林 541004; 2.中国科学院 广州地球化学研究所; 同位素地球化学国家重点实验室, 广东 广州 510640; 3.中国科学院大学, 北京 100049; 4.江西耀升钨业股份有限公司, 江西 赣州 341300; 5.江西省崇义县交通运输局, 江西 赣州 341300
Author(s):
ZHOU Yun1 2 LIANG Xinquan2 LIANG Xirong2 JIANG Ying2 3 CAI Yunhua4 ZOU Shuichang5 WANG Ce2 3 FU Jiangang2 3 DONG Chaoge2 3
1. College of Earth Sciences, Guilin University of Technology, Guilin 541004, Guangxi, China; 2. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China; 3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China; 4. Jiangxi Yaosheng Tungsten Co., Ltd., Ganzhou 341300, Jiangxi, China; 5. Chongyi Transportation Department, Ganzhou 341300, Jiangxi, China
关键词:
白垩纪 火山岩 锆石U-Pb定年 Sr-Nd同位素 海南岛
分类号:
P581; P595
DOI:
10.16539/j.ddgzyckx.2015.05.013
文献标志码:
A
摘要:
琼南分布有大量白垩纪火山岩, 目前对这些火山岩的研究程度仍然较低。本文对出露在三亚六罗地区六罗村组的白垩纪火山岩进行了精细的年代学和元素地球化学分析。LA-ICP-MS锆石U-Pb定年表明, 六罗村组上部的流纹岩和下部的玄武安山岩具有一致的形成年龄, 均为102±1 Ma。其中流纹岩样品富硅高钾, SiO2含量73.77%~74.79%, K2O含量5.09%~6.77%, K2O/Na2O比值1.71~2.80; 属强过铝质(A/CNK=1.17~1.22)、高钾钙碱性岩系。样品具中等负Eu异常(δEu=0.51~0.61), 亏损Nb、Ta, 富集Rb、Ba等大离子亲石元素(LILE); 轻、重稀土元素分馏程度较强, (La/Yb)CN值为15.05~16.97。玄武岩?安山岩样品的SiO2含量在49.82%~57.93%之间, 其K2O/Na2O比值(0.32~1.11)明显低于流纹岩样品, Mg#(46~58)明显高于流纹岩样品。样品的轻、重稀土元素分馏程度相对流纹岩样品要弱, 其(La/Yb)CN值为9.42~12.24; Eu异常不明显(δEu=0.86~0.94), 亏损Nb、Ta, 富集LILE, P、Ti元素的负异常相对流纹岩样品要弱。Sr-Nd同位素研究结果显示, 流纹岩和玄武岩–安山岩样品的(87Sr/86Sr)i值分别为0.708222~0.708965和0.707532~0.708401; εNd(t)值分别为–2.49~–2.69和–2.35~–4.09, 二者具有一致的Sr-Nd同位素组成。综合分析认为这套火山岩的源区可能来自受俯冲组分交代的大陆岩石圈地幔, 形成于伸展环境, 可能与古太平洋板块俯冲引起的岩石圈伸展有关。

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