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吉林辉南“反应”成因方辉橄榄岩包体及其深部动力学意义

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徐义刚 MFTHIRLWALL 等. 吉林辉南“反应”成因方辉橄榄岩包体及其深部动力学意义[J]. 岩石学报, 2003, 19(1): 19-26.
引用本文: 徐义刚 MFTHIRLWALL 等. 吉林辉南“反应”成因方辉橄榄岩包体及其深部动力学意义[J]. 岩石学报, 2003, 19(1): 19-26.
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XU YiGang,HUANG XiaoLong,M F THIRLWALL and CHEN XiaoMing 1. Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China2. Department of Geology,Royal Holloway University of London,Egham Surrey,TW20 OEX,UK3. Department of Earth Sciences,Nanjing University,Nanjing 210093,China. 'Reactive' harzburgite xenoliths from Huinan, Jilin province and their implications for deep dynamic processes[J]. Acta Petrologica Sinica, 2003, 19(1): 19-26.
Citation: XU YiGang,HUANG XiaoLong,M F THIRLWALL and CHEN XiaoMing 1. Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China2. Department of Geology,Royal Holloway University of London,Egham Surrey,TW20 OEX,UK3. Department of Earth Sciences,Nanjing University,Nanjing 210093,China. "Reactive" harzburgite xenoliths from Huinan, Jilin province and their implications for deep dynamic processes[J]. Acta Petrologica Sinica, 2003, 19(1): 19-26.
shu

吉林辉南“反应”成因方辉橄榄岩包体及其深部动力学意义

    • [1]中国科学院广州地球化学研究所，广州510640 [2]DepartmentofGeology,RoyalHollowayUniversityofLondon,EghamSurrey,TW20OEX,UK

  • 基金项目:

    国家自然科学基金(编号:49925308,49703042)项目，国家科技部攀登项目(95预选-39)资助成果

"Reactive" harzburgite xenoliths from Huinan, Jilin province and their implications for deep dynamic processes

    摘要
  • 同正常的残余方辉橄榄岩相比，辉南方辉橄榄岩具有异常高的HREE组成和特殊的二次重结晶结构，因此，它们不是上地幔经大程度部分熔融后的残余，而是熔体－岩石反应的结果。倒U型REE分配模式暗示这些样品经历了与玄武质熔体相互作用的历史，并达到了平衡，大量熔（流）体的存在有利于地幔岩石矿物颗粒的增长，从而形成特征的二次重结晶结构。这种“反应”型方辉橄榄岩的形成可能与上涌软流图对岩石圈地幔的热－化学浸蚀有关。“反应型”方辉橄榄岩形成之后，又受到了类似于碳酸岩或富挥发份小体积熔体的交代，因此辉南地区上地幔经历了多期地幔交代作用。
    The harzburgites from Huinan are not residues of partial melting of large degree in the mantle, because they have anomalously high HREE abundance and peculiar secondarily recrystallized texture, when compared to the normal residual harzburgites. Instead, they likely resulted from melt-mantle reaction through clinopyroxene dissolution and olivine precipitation. The convex-upward REE pattern suggests that these samples were in equilibrium with melts with basaltic composition at high melt/rock ratio. The presence of melts/fluids enhanced the grain growth in peridotites, giving rise to the formation of secondarily recrystallized texture, typical of the Huinan harzburgites. The formation of the Huinan harzburgites was probably related to thermo-chemical erosion of the lithosphere mantle by upwelling asthenosphere. These "reactive" harzburgites were further affected by metasomatism involving carbonate or volatile-rich small volume silicate melts.
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修回日期:  2001-12-10
刊出日期:  2003-02-28

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