| 扬子地台西缘富碱花岗斑岩特征及成因探讨 |
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| 引用本文： | 胡祥昭,黄震.扬子地台西缘富碱花岗斑岩特征及成因探讨[J].大地构造与成矿学,1997,21(2):173-180. |
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| 作者姓名： | 胡祥昭 黄震 |
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| 作者单位： | 中南工业大学地质系 |
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| 摘 要： | 本详细研究了扬子地台西缘富碱花花岗斑岩的岩石学、矿物学、稀土元素地球化学和Ｓｒ、Ｓ、Ｐｂ同位素的特征，指出富碱花岗斑岩侵入年代新，同其同位素年龄范围为３５－５２Ｍａ，属于喜马拉雅期产物，岩石主要成分钾长石（３５％－４５％）、斜长石（１５％±）、黑云母（１０％±）和角闪石（５％±）。
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| 关 键 词： | 本文详细研究了扬子地台西缘富碱花花岗斑岩的岩石学、矿物学、稀土元素地球化学和Sr、S、Pb同位素的特征，指出富碱花岗斑岩侵入年代新，其同位素年龄范围为35～52Ma，属于喜马拉雅期产物，岩石主要成分为钾长石（3％～45％）、斜长石（15％±）、黑云母（10％±）和角闪石（5 |
THE PETROLOGY AND PETROGENSIS OF THE YANGTZE PLATFROM WESTERN MARGINIS ALKALI-RICH GRANITE PORPHYTY |
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| Abstract: | After studying systematically petology, mineralogy, perochmistry. REE geocheminstry and strontium, sulphur, lead isotope of the alkali-rich granite prophyry distributed extensively in the Yangtze platfrom western margin's alkali-rich granite porphyry, we point out that the alkallurich granite porphyry have the properties of new intrusive era. Range of the isotope age is from 36 Ma to 51 Ma. They belong to the Himalaya date. Main mineral componets of the alkali-rich granite porhyry consist of K-feldspar (35% - 45% ), quartz (36%±), plagloclase (15%±) and biotite (10%±). Accessary minerals of the rock belong to type of xenotime-zircon-monayite. Chemical composition of the alkali-rich granite porphyry are SiO2-poor Al2O3-rich and alkalisirich, sufficeient patassiunl, (K2O+Na2O) range of the alkali-rich granite porphyry is 8. 59%～11. 27%. Average is 9. 85%. The REE total of the alkali-rich granite porphyry is less. Average coefficient is 0. 52. The REE distribution Pattern is a smooth curve steeply sloping to right (87Sr/86Sr)i＝0. 7073. The lead is from the upper mantle. Range of the sulphur isotope δ34S%, is harrow and is close to aerolite--sUlphurcomposition. The petrogenic substances possibly come from the upper mantle. Petrogentictype belongs to "A" type of granite. |
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| Keywords: | granite porphyry alkali-rich petrogenesis |
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