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- W2883820160 abstract "永平卓潘碱性杂岩体是三江特提斯新生代钾质岩浆带重要组成部分，位于兰坪盆地西缘。岩石类型主要为正长辉石岩、辉石正长岩、正长岩以及少量霞石正长岩。岩石化学性质显示高碱、高K2O/Na2O比值、低TiO2和高Al2O3的特征。岩体微量元素显示富集大离子亲石元素（LILE），相对亏损高场强元素（HFSE）元素，特别是'Ta-Nb-Ti'负异常更明显，具有典型俯冲带岩浆的特征。稀土总含量都比较高，LREE富集，HLEE相对亏损，Eu负异常不明显或无Eu负异常，（La/Yb）N值较大介于38.2~80.3之间。对卓潘岩体的正长岩和正长辉石岩2个样品进行了LA-ICP-MS锆石U-Pb定年，年龄分别为33.40±0.38Ma和34.22±0.33Ma。正长辉石岩eHf（t）值介于-10.6~-4.3之间，二阶段模式年龄在1356~1759Ma之间。卓潘碱性杂岩体不同岩性的稀土元素配分曲线和微量元素原始地幔标准化图解基本一致，表明卓潘碱性杂岩体不同类型的岩石是同源岩浆演化的产物。岩体的Nb/U均值为2.95介于俯冲带流体和全球俯冲沉积物之间以及岩体微量元素明显亏损高场强元素Ti、Nb、Ta，稀土元素表现为轻稀土富集、无或弱的负Ce和负Eu异常，暗示了岩浆源区存在俯冲的洋壳或陆壳沉积物的流体或熔融体与岩石圈地幔的交代富集作用。岩浆源区经历晚石炭世-晚二叠世（305~250Ma）古特提斯昌宁-孟连洋和古特提斯金沙江-哀牢山洋双向俯冲，岩石圈地幔发生富集作用并形成富钾的交代岩石圈地幔。在新生代，新特提斯洋岩石圈从印度大陆岩石圈断离，引发交代富集大陆岩石圈地幔拆沉，热的软流圈上涌，熔融交代的富钾岩石圈地幔，岩浆侵位分异形成卓潘岩体。" @default.
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- W2883820160 date "2018-05-25" @default.
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- W2883820160 title "西南三江永平卓潘碱性杂岩体源区与形成机制:全岩元素、锆石U-Pb年代学和Hf同位素联合约束" @default.
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