| 澜沧江杂岩带小黑江-上允地区蓝片岩的成因及变质演化 |
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| 引用本文： | 王舫,刘福来,冀磊,刘平华,蔡佳,田忠华,刘利双.澜沧江杂岩带小黑江-上允地区蓝片岩的成因及变质演化[J].岩石矿物学杂志,2016,35(5):804-820. |
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| 作者姓名： | 王舫 刘福来 冀磊 刘平华 蔡佳 田忠华 刘利双 |
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| 作者单位： | 中国地质科学院 地质研究所, 北京 100037;中国地质科学院 地质研究所, 北京 100037;中国地质科学院 地质研究所, 北京 100037;中国地质科学院 地质研究所, 北京 100037;中国地质科学院 地质研究所, 北京 100037;中国地质科学院 地质研究所, 北京 100037;中国地质科学院 地质研究所, 北京 100037 |
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| 基金项目： | 国家自然科学基金项目（41302039，41372069） |
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| 摘 要： | 通过对澜沧江杂岩带小黑江-上允地区蓝片岩的岩相学、地球化学、成因矿物学以及相平衡模拟的综合研究,阐述蓝片岩的原岩以及变质演化过程。地球化学分析结果显示,蓝片岩具有一致的稀土元素配分模式,具弱Eu正或负异常,稀土元素和微量元素特征与OIB相似,其原岩可能为OIB型玄武岩。详细矿物学研究表明,本区蓝片岩记录了俯冲峰期蓝片岩相变质和峰期后绿片岩相变质两个变质阶段,其矿物组合分别为蓝闪石+钠长石+多硅白云母+绿泥石+绿帘石和蓝闪石+钠长石±阳起石+绿泥石+绿帘石。通过Na_2O-Ca O-Fe O-MgO-Al_2O_3-SiO_2-H_2O-O体系相平衡计算,得到两个阶段的压力范围分别约为0.95 GPa和0.40 GPa。
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| 关 键 词： | 蓝片岩 变质演化 澜沧江杂岩带 |
| 收稿时间： | 2016/4/25 0:00:00 |
| 修稿时间： | 2016/8/16 0:00:00 |
Petrogenesis and metamorphic evolution of blueschist from Xiaoheijiang-Shangyun area in Lancangjiang metamorphic complex |
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| WANG Fang,LIU Fu-lai,JI Lei,LIU Ping-hu,CAI Ji,TIAN Zhong-hua and LIU Li-shuang.Petrogenesis and metamorphic evolution of blueschist from Xiaoheijiang-Shangyun area in Lancangjiang metamorphic complex[J].Acta Petrologica Et Mineralogica,2016,35(5):804-820. |
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| Authors: | WANG Fang LIU Fu-lai JI Lei LIU Ping-hu CAI Ji TIAN Zhong-hua and LIU Li-shuang |
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| Institution: | Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: | Blueschist sporadically occurs as lenses within Lancangjiang metamorphic complex. The combined studies of petrography, geochemistry, genetic mineralogy and phase equilibrium modeling for blueschists within Xiaoheijiang-Shangyun area provide a significant insight into protoliths and metamorphic evolution. Geochemical features show that they have similar rare-earth elements(REE) patterns, with slight Eu anomalies. REE and trace elements compositions have an affinity to those of oceanic island basalts(OIB),suggesting that their protoliths were OIB-type basalts. Petrological studies show that blueschists contain two distinct mineral assemblages characterized by glaucophane+albite+phengite+chlorite+epidote+titanite, glaucophane+albite±actinolite+chlorite+epidote+titanite which record a peak blueschist phase, a greenschist phase. Calculated pseudosection in the system Na2O-CaO-FeO-MgO-Al2O3-SiO2-H2O-O yielded pressure conditions of around 0.95 GPa, 0.40 GPa, respectively. |
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| Keywords: | blueschist metamorphic evolution Lancangjiang metamorphic complex |
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