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- W3137121544 abstract "本文以三江南段景洪大勐龙地区新发现的退变榴辉岩和蓝片岩为研究对象，对其进行了系统的地球化学、原岩性质及锆石U-Pb定年的综合研究。大勐龙地区退变榴辉岩呈透镜状产于白云钠长石英片岩、白云母片岩和斜长角闪（片）岩中，其原岩为亚碱性拉斑玄武岩，球粒陨石标准化稀土元素配分曲线呈轻稀土弱亏损、重稀土平坦型的分布特征，不具有Nb、Ta、Ti的亏损，与典型的N-MORB（正常型洋中脊玄武岩）地球化学特征一致，表明其原岩可能来源于亏损的地幔区，形成于洋中脊环境；变质锆石SHRIMP U-Pb年龄为230.3±1.7Ma，可能代表榴辉岩峰期的变质时代。蓝片岩的原岩为亚碱性拉斑玄武岩，具有较高Ti玄武岩的特征（TiO<sub>2</sub>含量2.55%~2.88%，均大于2%），稀土元素总量变化范围小，比典型的N-MORB稀土总量偏高，轻稀土元素（LREE）亏损，无明显负Eu异常，地球化学性质与N-MORB类似。结合以往区域研究成果，进一步确定研究区退变榴辉岩和蓝片岩的原岩属于典型N-MORB型，该项研究不仅在昌宁-孟连缝合带的南段发现典型的特提斯洋壳残片，而且为进一步深入探讨滇西地区特提斯洋消减-闭合的动力学背景及其复杂的构造演化过程提供了重要的科学依据。" @default.
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- W3137121544 date "2021-01-01" @default.
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- W3137121544 title "Geochemical characteristics and tectonic significance of basic high-pressure metamorphic rocks in the Damenglong-Jinghong area, southern Sanjiang" @default.
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