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河北承德盆地114Ma大北沟组玄武岩地球化学及其对华北克拉通岩石圈地幔减薄作用的制约
  • 期刊名称：2007. 地学前缘, 14: 98-108
  • 时间：0
  • 分类：P588.145[天文地球—岩石学;天文地球—地质学]
  • 作者机构：[1]西北大学地质系大陆动力学国家重点实验室 中国地质科学院地质研究所 沈阳地质矿产研究所 陕西西安 陕西西安 中国地质大学（武汉）地球科学学院 湖北武汉 辽宁沈阳
  • 相关基金：国家自然科学基金资助项目(40521001);; 教育部科学研究重大项目(IRI0441)
  • 相关项目：大陆岩石圈深部再循环与华北克拉通及其邻区中新生代演化
关键词： 承德盆地, 早白垩世, LA-ICPMS定年, 富集地幔, 亏损地幔, Chengde Basin, early Cretaceous, LA-ICPMS dating, enriched mantle, depleted mantle
中文摘要：

华北克拉通罕见年龄界于120～100Ma的火山岩。承德盆地大北沟组火山岩下部主要由柱状节理橄榄玄武岩组成,中上部主要由安山岩组成。对紧邻玄武岩的上覆安山岩的火山锆石U-PbLA-ICPMS定年结果表明,形成年龄为(113.6±0.87)Ma,代表了该套火山岩的喷发年龄,表明它们形成于早白垩世晚期。对3件玄武岩样品的分析结果表明,它们亏损高场强元素(Nb、Ta、Zr、Hf),初始87Sr/86Sr同位素比值为0.7059,εNd(114Ma)为-11.04,具有富集型岩石圈地幔的特征。但该套玄武岩的主量和微量元素特征则介于华北克拉通中生代年龄>120Ma具古老富集型地幔特征的玄武岩和年龄<100Ma具亏损软流圈性质的玄武岩之间,表明113.6Ma时华北克拉通岩石圈地幔在元素组成方面已具有由富集地幔向亏损型软流圈地幔转变的特征。大北沟组玄武岩的地球化学特征表明,114Ma时华北克拉通岩石圈地幔已减薄。

英文摘要：

Basalts between 120-100 Ma are rare in the North China craton. The Dabeigou Group consists of olivine basalt in the lower part and andesite in the middle and upper parts. Zircons from the andesite were dated by LA-ICPMS yielding a late Early Cretaceous age of (113.6±0.87) Ma. Geochemical analyses of 3 basalt samples show depletion in high field-strength elements (Nb, Ta, Zr, Hf). Their 87Sr/86Sr ratio and εNd value at 114 Ma are 0.705 9 and -11.04. These values are consistent with a source from enriched lit...

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