| 渤海—鲁西地区白垩-早第三纪裂谷活动——火山岩的地球化学证据 |
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| 引用本文： | 侯贵廷,钱祥麟,蔡东升.渤海—鲁西地区白垩-早第三纪裂谷活动——火山岩的地球化学证据[J].地质科学,2003,38(1):13-21. |
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| 作者姓名： | 侯贵廷 钱祥麟 蔡东升 |
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| 作者单位： | 1. 北京大学地球与空间科学学院, 北京, 100871;2. 渤海石油地质研究院, 天津, 300452 |
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| 基金项目： | 国家自然科学基金，40172066， |
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| 摘 要： | 渤海—鲁西地区的白垩早第三纪火山岩在渤海东部主要沿郯庐断裂带呈北北东向分布,在渤海西部和鲁西地区主要沿北西向断裂带分布。白垩纪火山岩以安山岩类为主,早第三纪以玄武岩类为主,玄武岩浆源于富集型地幔,即富集轻稀土和大离子亲石元素,但明显亏损Yb、Ni和Cr等元素。火山岩的Sr和Nd同位素初始比值结果表明白垩纪的火山岩来源于Ⅱ型富集地幔,而早第三纪火山岩来源于接近原始地幔的略富集型地幔。这可能由于早第三纪岩石圈大规模伸展减薄,致使上地幔深部的亏损型物质上涌参与岩浆活动,与富集型地幔混染的结果。
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| 关 键 词： | 裂谷活动 白垩早第三纪 火山岩 同位素地球化学 渤海—鲁西地区 |
| 收稿时间： | 2000-09-25 |
| 修稿时间： | 2000年9月25日 |
CRETACEOUS-PALEOGENE RIFTING IN THE BOHAI SEA AND WESTERN SHANDONG: GEOCHEMICAL EVIDENCE FROM VOLCANIC ROCKS |
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| Hou Guiting,Qian Xianglin,Cai Dongsheng.CRETACEOUS-PALEOGENE RIFTING IN THE BOHAI SEA AND WESTERN SHANDONG: GEOCHEMICAL EVIDENCE FROM VOLCANIC ROCKS[J].Chinese Journal of Geology,2003,38(1):13-21. |
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| Authors: | Hou Guiting Qian Xianglin Cai Dongsheng |
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| Institution: | 1. School of Earth and Space Science, Peking University, Beijing 100871;2. Institute of Bohai Petroleum Geology, Tianjin 300452 |
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| Abstract: | The Cretaceous-Paleogene volcanic rocks in the eastern Bohai Sea distributed along the Tanlu fault zone, and the volcanic rocks in the western Bohai Sea and western Shandong distributed along the NW-trending fault zones. The volcanic rocks were mainly composed of andesite in age of Cretaceous, and of basalt in age of Paleogene, respectively. The basaltic magma came from rich mantle, rich in LREE and large ion lithophile elements, but deficit Ni and Cr. The initial ratio of Sr and Nd isotopic elements showed that the Cretaceous volcanic rocks originated from the second type of rich mantle while the Paleogene volcanic rocks from rich mantle similiar to primary mantle. The large-scale extension and thinning of the lithosphere in the Baohai Sea and western Shandong during Paleogene resulted in the deficit materials from the deep part of upper mantle upwelling, joining the magmatism and contaminating the rich mantle. |
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| Keywords: | Rifting Cretaceous-Paleogene The volcanic rocks Isotopic geochemistry The Bohai Sea and western Shandong |
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