| 大兴安岭北段塔木兰沟组玄武岩地球化学及构造背景 |
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| 引用本文： | 张昱,赵焕力,韩彦东.大兴安岭北段塔木兰沟组玄武岩地球化学及构造背景[J].地质与资源,2005,14(2):87-91,96. |
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| 作者姓名： | 张昱 赵焕力 韩彦东 |
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| 作者单位： | 1. 中国地质大学, 北京 100083;2. 黑龙江地质调査研宄总院, 黑龙江哈尔滨 150036;3. 黑龙江地质调査研宄总院齐齐哈尔分院, 黑龙江齐齐哈尔 161005 |
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| 摘 要： | 通过对大兴安岭北段塔木兰沟组玄武岩岩石学、地球化学及其形成的大地构造环境的综合研究发现,塔木兰沟组玄武岩具有拉斑玄武岩和碱性玄武岩的双重特征,Na2O-22O;Eu无异常,La/Yb=35.7(平均);富集Ba、Sr、K,亏损Nb.岩浆的形成可能与裂谷作用有关.在这一构造-热事件中,推测该裂谷在上黑龙江地区陆壳减薄最大,呼中地区岩石圈减薄最大,根河地区陆壳、岩石圈减薄均较小.
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| 关 键 词： | 玄武岩 裂谷作用 塔木兰沟组 大兴安岭北段 |
| 文章编号： | 1671-1947（2005）02-0087-06 |
| 收稿时间： | 2003-10-05 |
| 修稿时间： | 2003年10月5日 |
GEOCHEMICAL CHARACTERISTICS AND TECTONIC BACKGROUND OF BASALT FROM TAMULANGOU FORMATION IN NORTHERN DAXINGANLING |
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| ZHANG Yu,ZHAO Huan-li,HAN Yan-dong.GEOCHEMICAL CHARACTERISTICS AND TECTONIC BACKGROUND OF BASALT FROM TAMULANGOU FORMATION IN NORTHERN DAXINGANLING[J].Geology and Resources,2005,14(2):87-91,96. |
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| Authors: | ZHANG Yu ZHAO Huan-li HAN Yan-dong |
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| Institution: | 1. China University of Geosciences, Beijing 100083, China;2. Heilongjiang Institute of Regional Geological Survey, Harbin 150036, China;3. Qiqihar Branch, Heilongjiang Institute of Regional Geological Survey, Qiqihar 161005, China |
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| Abstract: | Study on the petrology,geochemistry and tectonic setting of the basalt from Tamulangou formation indicates that the basic volcanic rocks are geochemically similar to both tholeiitic basalt and alkali basalt,with Na2O-2< K2O,no negative Eu anomaly,La/Yb=35.7,rich Ba,Sr and K,and deficient Nb.The magma is probably generated by rifting.In such a thermal-tectonic event,it is speculated that the crust in Shangheilongjiang area and the lithosphere in Huzhong area were thinned greatly;while the lithosphere and the crust in Genhe area were slightly thinned. |
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| Keywords: | basalt rifting Tamulangou formation Northen Daxinganling |
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