| 用沉积记录来估计峨眉山玄武岩喷发前的地壳抬升幅度 |
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| 引用本文： | 何斌,徐义刚,王雅玫,罗震宇,王康明.用沉积记录来估计峨眉山玄武岩喷发前的地壳抬升幅度[J].大地构造与成矿学,2005,29(3):316-320. |
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| 作者姓名： | 何斌 徐义刚 王雅玫 罗震宇 王康明 |
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| 作者单位： | 中国科学院,广州地球化学研究所,广东,广州,510640;中国地质大学,珠宝学院,湖北,武汉,430074;四川攀西地质大队,四川,西昌,615000 |
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| 基金项目： | 国家自然科学基金，中国科学院知识创新工程项目 |
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| 摘 要： | 玄武岩喷发前公里规模的地壳抬升是大火成岩省地幔柱成因的一个重要标志,此类地质证据的缺乏反过来被一些学者用来否定地幔柱学说。本文在厘定峨眉山大火成岩省中冲积扇沉积记录的基础上,根据茅口组顶部的剥蚀特征,估算峨眉山地幔柱上升造成的地壳抬升幅度大于1000m,这与CampbellandGriffiths的地幔柱理论模型基本吻合,从而为峨眉山大火成岩省的地幔柱形成机制,乃至激烈争议中的地幔柱学说提供了有力的佐证。
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| 关 键 词： | 峨眉山大火成岩省 地幔柱 地壳抬升 沉积记录 |
| 文章编号： | 1001-1552(2005)03-0316-05 |
| 收稿时间： | 2004-11-05 |
| 修稿时间： | 2004年11月5日 |
THE MAGNITUDE OF CRUSTAL UPLIFT PRIOR TO THE ERUPTION OF THE EMEISHAN BASALT: INFERRED FROM SEDIMENTARY RECORDS |
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| HE Bin,XU Yigang,WANG Yamei,LUO Zhengyu,WANG Kangming.THE MAGNITUDE OF CRUSTAL UPLIFT PRIOR TO THE ERUPTION OF THE EMEISHAN BASALT: INFERRED FROM SEDIMENTARY RECORDS[J].Geotectonica et Metallogenia,2005,29(3):316-320. |
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| Authors: | HE Bin XU Yigang WANG Yamei LUO Zhengyu WANG Kangming |
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| Abstract: | Kilometer-scale uplift prior to the eruption of basalt in large igneous province is the most remarkable characteristic for mantle plume model. However, few examples were documented in the international geological literatures and the mantle plume theory was disagreed upon by some geologists. This paper describes alluvial fan deposits in detail. Based on the geometry of the alluvial fan and the erosional features on the top of Maokou Formation, it is suggested that the magnitude of crustal uplift prior to the eruption of the Emeishan basalt is more than 1,000 m. This research result is well consistent with the crustal uplift caused by a starting mantle plume as predicted by Griffiths and Campbell modeling, and thus strongly supports a plume origin of the Emeishan flood basahs and the mantle plume theory as well. |
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| Keywords: | Emeishan large igneous province mantle plume crustal uplift sedimentary record |
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