| 冀北地区中生代岩浆岩密度分布特征及其幔枝构造的研究 |
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| 引用本文： | 郭友钊,李磊,张亚东,董杰.冀北地区中生代岩浆岩密度分布特征及其幔枝构造的研究[J].物探与化探,2001,25(5):379-382. |
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| 作者姓名： | 郭友钊 李磊 张亚东 董杰 |
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| 作者单位： | 1. 中国地质科学院地球物理地球化学勘查研究所
2. 河北地球物理勘查院 |
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| 基金项目： | 中国地质科学院地质大调查项目(DK9902057) |
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| 摘 要： | 通过对河北省北部中生代岩浆岩岩石密度及空间分布的统计分析,发现偏酸性岩浆岩具有较低的密度,而偏基性岩浆岩具有较高的密度,喷出火山岩与侵入岩体的密度分布均具规律性。由此推断,河北省北部中生代岩浆活动可能是一个地幔热柱的幔枝,中心以偏基性岩浆活动为主,周围则以偏酸性岩浆活动为主,幔枝的结构控制了本区的成矿作用。
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| 关 键 词： | 冀北 岩浆岩 密度 地幔热柱 成矿作用 |
| 文章编号： | 1000-8918(2001)05-0379-04 |
| 收稿时间： | 2001-04-22 |
SPATIAL DENSITY DISTRIBUTION OF MESOZOIC INTRUSIVE ROCKS AND A BRANCH OF MENTLE INTRUSIVE ROCK DENSITY AND A BRANCH OF MANTLE PLUME IN NORTHERN HEBEI PROVINCE |
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| GUO You zhao ,LI Lie , ZHANG Ya dong , DONG Jie.SPATIAL DENSITY DISTRIBUTION OF MESOZOIC INTRUSIVE ROCKS AND A BRANCH OF MENTLE INTRUSIVE ROCK DENSITY AND A BRANCH OF MANTLE PLUME IN NORTHERN HEBEI PROVINCE[J].Geophysical and Geochemical Exploration,2001,25(5):379-382. |
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| Authors: | GUO You zhao LI Lie ZHANG Ya dong DONG Jie |
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| Institution: | GUO You zhao 1,2,LI Lie 2, ZHANG Ya dong 3, DONG Jie 3 |
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| Abstract: | The statistic results of the density distribution of Mesozoic intrusive rocks reveal that the density of basic igneous rocks is higher than that of acidic igneous rocks. The spatial density distribution of extrusive rocks and that of intrusive rocks show regularity, i.e., relatively high density or low density areas are concentrated in specific sites. Therefore, to explain the regional tectonics of northern Hebei Province, this paper suggests the existence of a branch of mantle plume, in which high density basic igneous rocks are located at the center and low density acidic igneous rocks are situated on the edge. The structure of the branch plume might have controlled the regional ore-forming process. |
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| Keywords: | Northern Hebei Province intrusive rock density mantle plume ore forming process |
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