| 北祁连奥陶纪洋脊扩张速率及古洋盆规模的岩石学约束 |
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| 引用本文： | 赖绍聪,邓晋福.北祁连奥陶纪洋脊扩张速率及古洋盆规模的岩石学约束[J].矿物岩石,1997,17(1):35-39. |
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| 作者姓名： | 赖绍聪 邓晋福 |
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| 作者单位： | 西北大学地质系，中国地质大学地质系 |
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| 基金项目： | 国家自然科学基金,地矿部地学断面基金 |
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| 摘 要： | 北祁连奥陶纪期间为一多岛洋，由中间微陆块分隔的三个相对独立的洋盆联合组成。火山岩可区分为洋脊型、洋岛（海山）型及岛弧型三种主要的构造岩石组合类型。根据火山岩化学成分计算获得三个洋盆的扩张速率分别为４．４５ｃｍ／ａ，０．７５ｃｍ／ａ和０．８ｃｍ／ａ；闭合速率分别为４．０５ｃｍ／ａ，３．１０ｃｍ／ａ和４．８７ｃｍ／ａ。奥陶纪末期，三个洋盆相继闭合，形成了下伏的中南祁连陆块—北祁连陆－陆碰撞构造混杂带—上叠的阿拉善陆块三个构造单元叠置的构造构局
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| 关 键 词： | 扩张速率 古洋盆 火山岩 北祁连 |
PETROLOGIC RESTRICTIONS ON THE ORDOVICIAN OCEAN BASIN SCALE AND SPREADING RATE IN QILIAN AREA * |
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| Lai Shaocong,Deng Jinfu Zhao Hailing.PETROLOGIC RESTRICTIONS ON THE ORDOVICIAN OCEAN BASIN SCALE AND SPREADING RATE IN QILIAN AREA *[J].Journal of Mineralogy and Petrology,1997,17(1):35-39. |
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| Authors: | Lai Shaocong Deng Jinfu Zhao Hailing |
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| Abstract: | It was underwent complicated tectonic movement the Ordovician marine volcanic rocks in the north Qilian mountain which characterized by the geological features of tectonic melange of continent to continent collision,and can be classified into three main kinds of petrotectonic assemblage.During Ordovician period,north Qilian area was a polyisland ocean,which consisted of three ocean basins separated by the middle microcontinental blocks. |
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| Keywords: | spreading rate ancient ocean basin volcanic rock North Qilian |
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