| 甘肃南祁连党河南山奥陶纪火山岩的岩石地球化学特征 |
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| 引用本文： | 冯备战.甘肃南祁连党河南山奥陶纪火山岩的岩石地球化学特征[J].甘肃地质学报,2006,15(2):15-19. |
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| 作者姓名： | 冯备战 |
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| 作者单位： | 甘肃省地质调查院 甘肃兰州730000 |
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| 基金项目： | 中国地质调查局国土资源专项调查项目（项目编号：19961300010021）. |
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| 摘 要： | 甘肃南祁连褶皱带党河南山早奥陶纪火山岩主要赋存于吾力沟群中。地球化学研究结果表明,本区火山岩由基性火山岩和中性火山岩组成,基性火山岩分属拉斑玄武岩和钙碱性玄武岩,而中性火山岩则属钙碱性安山岩。它们均具有低TiO2、MgO,选择性富集大离子亲石元素(Rb、Th、Ba、Sr)和轻稀土元素(La、Ce、Sm),具有较高的高价大阳离子比值和Nb的强烈亏损,岩石学和地球化学特征表明本区火山岩形成于岛弧环境。
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| 关 键 词： | 南祁连 吾力沟群 基性火山岩 中性火山岩 岛弧 |
| 文章编号： | 1004-4116（2006）02-0015-0005 |
| 收稿时间： | 2005-12-14 |
GEOCHEMISTRY OF THE ORDOVICIAN VOLCANIC ROCKS IN
SOUTHERN DANGHE MOUNTAINS, SOUTHERN QILIANG
MOUNTAINS, GANSU PROVINCE |
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| FENG Bei-zhan.GEOCHEMISTRY OF THE ORDOVICIAN VOLCANIC ROCKS IN
SOUTHERN DANGHE MOUNTAINS, SOUTHERN QILIANG
MOUNTAINS, GANSU PROVINCE[J].Acta Geologica Gansu,2006,15(2):15-19. |
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| Authors: | FENG Bei-zhan |
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| Institution: | Geological Survey Gansu Province, Lanzhou 730000, China |
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| Abstract: | Southern Danghe mountain early in the Ordovician Period volcanic rock outcropping to Gansu southern Qilian fold belts to bring is chiefly composed keeping Wuligou Groups in,and the geochemistry researches the result making known,and this district volcanic rock consists of basic lava and intermediate lava,and basic lava branch belongs drawing the alkalic basalt series and the tholeiite series,but the intermediate lava belong to calcic-alkalic andesite.They all have low-TiO_2 and low-MgO,the selectivity enriches to intimate stone elements(Rb,Th,Ba,Sr)and light REE elements(La,Ce,Sm),and have the intense deficit of great cation ratio and Nb of higher high price,and these petrology and geochemistry features make known that this district volcanic rock takes shape to the arc environment on island. |
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| Keywords: | the southern Qilian Mountains Wuligou Groups basic lava intermediate lava land-arc environment |
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