| 维西工农超镁铁-镁铁岩带岩石学及其构造意义 |
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| 引用本文： | 王闻胜,严城民.维西工农超镁铁-镁铁岩带岩石学及其构造意义[J].云南地质,2007,26(1):15-24. |
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| 作者姓名： | 王闻胜 严城民 |
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| 作者单位： | 1. 云南地矿珠宝有限公司,昆明,650051
2. 云南省地矿局区域地质矿产调查大队,云南,玉溪,653100 |
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| 基金项目： | 中国地质调查局,1∶25万贡山县幅区域地质调查 |
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| 摘 要： | 工农超镁铁-镁铁岩带由橄榄岩、辉石岩、辉长岩、辉绿岩及基性火山岩组成,以构造岩片状产于工农断裂中,无就地分异现象。围岩中无明显热变质显示。橄榄岩的m/f比值为9.04~9.48,属镁质超镁铁岩。从超镁铁岩到镁铁岩,常量元素、稀土元素、微量元素有规律地变化,反映出岩石由同源岩浆分异而成。结合区域地质背景分析,工农超镁铁-镁铁岩是金沙江小洋盆向西俯冲消减过程中,攀天阁—崔依比弧间或弧后盆地扩张的产物,属科迪勒拉型蛇绿岩。
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| 关 键 词： | 超镁铁-镁铁岩 元素规则变化 科迪勒拉型 工农村维西县 云南 |
| 文章编号： | 1004-1885（2007）-015-10 |
| 收稿时间： | 2006-11-20 |
| 修稿时间： | 2006-11-20 |
THE PETROGRAPHY AND ITS STRUCTURAL SIGNIFICANCE OFGONGNONG ULTRAMAFIC- MAFIC ROCK ZONE IN WEIXI |
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| WANG Wen-sheng,YAN Cheng-min.THE PETROGRAPHY AND ITS STRUCTURAL SIGNIFICANCE OFGONGNONG ULTRAMAFIC- MAFIC ROCK ZONE IN WEIXI[J].Yunnan Geology,2007,26(1):15-24. |
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| Authors: | WANG Wen-sheng YAN Cheng-min |
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| Institution: | 1. Yunnan Jewellery company (Dd |
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| Abstract: | The Gongnong uhramafic -mafic rocks consist of peridotite, pyroxeno lite, gabbro, diabase and basic volcanic rock. The rock body is in the Gongnong fault as the structural rock slice, without insitu differentiation. There is not any evident thermal metamorphism in the wall rock. The m/f of peridotite is 9. 04 - 9. 48, which belongs to the magnesian uhramafic rock. The major elements, REE and trace elements change by rule from ultrama tic to mafic rock, which shows that they are formed by the differentiation of cogenetic magma. In combination with the analysis of the regional geological background, the Gongnong ultramafic -mafic rocks are formed by the expansion of the Pantiange -Cuiyibi inter- arc or arc -rear basin in the westward subduction of Jinshajiang micro - ocean basin, which belongs to the ophiolite of Cordillera type. |
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| Keywords: | Ultramafic Rock Mafic Rock Characteristics |
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