| 滇西南孟连一带晚古生代火山岩地球化学特征及大地构造背景研究 |
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| 引用本文： | 张双全,朱勤文.滇西南孟连一带晚古生代火山岩地球化学特征及大地构造背景研究[J].现代地质,1995,9(4):391-401. |
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| 作者姓名： | 张双全 朱勤文 |
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| 摘 要： | 孟连晚古生代火山岩可分为３类，即略亏损－略富集火山岩类、中等富集火山岩类和强富集火山岩类。地球化学及岩石组合特征表明本区火山岩可归入３个构造岩浆组合，即与ＮＭＯＲＢ相比略富集的洋脊玄武岩型、富集洋脊玄武岩（Ｐ－ＭＯＲＢ）与洋岛拉斑玄武岩（ＯＩＴＢ）过渡型及洋岛碱性玄武岩（ＯＩＡＢ）型。
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| 关 键 词： | 玄武岩，稀土元素，不相容元素，构造环境，洋中脊，洋岛，孟连，滇西 |
GEOCHEMICAL CHARACTERISTICS AND TECTONIC SETTINGS OF LATE PALAEOZOIC VOLCANIC ROCKS IN MENGLIAN AREA,SOUTHWESTERN YUNNAN |
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| Abstract: | n the Menglian area, there are three types of the Late Palaeozoic volcanic rocks,namely LREE mildly depleted-mildly enriched type, LREE-moderately enriched type,LREE-strogly enriched type, presenting different geochemical characteristics. The geochemical indicators and petrological assemblages suggest that the three types of volcanic rocks exactly correspond to three tectonomagmatic groups respectively,consisting of mildly enriched (compared with average N-MORB) MORB, the transition between P-MORB and OITB,and OIAB. |
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| Keywords: | basalt REE incompitable elements tectonic settings mid-ocean ridge oceanic island Menglian western Yunnan |
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