| 海南岛晚古生代洋岛玄武岩(OIB型)的发现及地球动力学暗示 |
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| 引用本文： | 王智琳,许德如,吴传军,付王伟,王力,吴俊.海南岛晚古生代洋岛玄武岩(OIB型)的发现及地球动力学暗示[J].岩石学报,2013,29(3):875-886. |
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| 作者姓名： | 王智琳 许德如 吴传军 付王伟 王力 吴俊 |
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| 作者单位： | 1. 中国科学院广州地球化学研究所矿物学与成矿学重点实验室,广州510640;中国科学院研究生院,北京100049
2. 中国科学院广州地球化学研究所矿物学与成矿学重点实验室,广州,510640 |
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| 基金项目： | 本文受国家重点基础研究发展计划973项目(2012CB416806)和国家自然科学基金(40473017、40773017)联合资助. |
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| 摘 要： | 海南岛西部的军营-邦溪地区产出一套变质的、晚古生代镁铁质-超镁铁质熔岩系列.根据地质学、岩石学、矿物学和地球化学研究,该套岩石可划分为高镁和低镁两个系列,前者以高镁(Mg# =76.9～81.3)为特征,后者以低镁(Mg#=40.7～48.4)、高钛含量(2.34％ ～3.27％)为特征.这套镁铁质-超镁铁质熔岩具有LREE富集(La/Yb)N =2.40～7.58]和无明显Eu异常的稀土配分模式,以及无Nb亏损、但略具轻微Ta正异常的微量元素原始地幔标准化曲线；87Sr/86Sr (270Ma)和εNd(270Ma)比值的变化范围分别为0.70645 ～0.70956和+4.7～ +6.5,这些地球化学特征与洋岛玄武岩(OIB)极其相似.一些反映源区特征的比值,如Ta/Hf、Th/Nb、Nb/Zr、La/Ta、La/Sm、(La/Nb)PM、(Th/Ta)PM等均指示其地幔柱成因,是石榴子石二辉橄榄岩地幔低程度部分熔融形成的产物.橄榄石斑晶的矿物化学进一步揭示,岩石的高镁性质是由橄榄石堆晶引起的,而橄榄石斑晶低的Fo(68 ～77)值,暗示其原始岩浆为低镁的玄武质岩浆；低镁系列相对于高镁系列明显低的Cr、Ni含量,说明岩浆随后发生了橄榄石和单斜辉石的分离结晶作用.军营-邦溪地区晚古生代OIB型洋岛玄武岩可能代表了东古特提斯洋在海南岛的又一记录,该认识对深入探讨华南古特提斯洋的演化及其在海南岛的响应提供了新的证据.
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| 关 键 词： | 镁铁质-超镁铁质熔岩 古特提斯洋 洋岛玄武岩 海南岛军营-邦溪地区 |
| 收稿时间： | 7/5/2011 12:00:00 AM |
| 修稿时间： | 3/7/2012 12:00:00 AM |
Discovery of the Late Paleozoic ocean island basalts (OIB) in Hainan Island and their geodynamic implications |
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| WANG ZhiLin,XU DeRu,WU ChuanJun,FU WangWei,WANG Li and WU Jun.Discovery of the Late Paleozoic ocean island basalts (OIB) in Hainan Island and their geodynamic implications[J].Acta Petrologica Sinica,2013,29(3):875-886. |
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| Authors: | WANG ZhiLin XU DeRu WU ChuanJun FU WangWei WANG Li and WU Jun |
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| Institution: | CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;Graduate University of Chinese Academy of Sciences, Beijing 100049, China;CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;Graduate University of Chinese Academy of Sciences, Beijing 100049, China;CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;Graduate University of Chinese Academy of Sciences, Beijing 100049, China;CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;Graduate University of Chinese Academy of Sciences, Beijing 100049, China;CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | |
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| Keywords: | Mafic-ultramafic lavas Paleo-Tethys OIB-type basalts Junying-Bangxi area in Hainan Island |
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