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冀北北岔沟门地区中生代侵入岩地质年代学和地球化学特征研究

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文章导航 > 岩石学报 > 2003 > 19(4): 661-674
毛德宝　陈志宏　钟长汀　左义成　石森　胡小蝶. 冀北北岔沟门地区中生代侵入岩地质年代学和地球化学特征研究[J]. 岩石学报, 2003, 19(4): 661-674.
引用本文: 毛德宝　陈志宏　钟长汀　左义成　石森　胡小蝶. 冀北北岔沟门地区中生代侵入岩地质年代学和地球化学特征研究[J]. 岩石学报, 2003, 19(4): 661-674.
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MAO DeBao,CHEN ZhiHong,ZHONG ChangTing,ZUO YiCheng,SHI Sen and HU XiaoDie Tianjin Institute of Geology and Mineral Resources,Tianjin 300170,China China University of Geosciences,Beijing 100083,China China Geological Survey,Beijing 1000035,China. Studies on the geochronology and geochemical characteristics of Mesozoic intrusions in Beichagoumen area, northern Hebei province[J]. Acta Petrologica Sinica, 2003, 19(4): 661-674.
Citation: MAO DeBao,CHEN ZhiHong,ZHONG ChangTing,ZUO YiCheng,SHI Sen and HU XiaoDie Tianjin Institute of Geology and Mineral Resources,Tianjin 300170,China China University of Geosciences,Beijing 100083,China China Geological Survey,Beijing 1000035,China. Studies on the geochronology and geochemical characteristics of Mesozoic intrusions in Beichagoumen area, northern Hebei province[J]. Acta Petrologica Sinica, 2003, 19(4): 661-674.
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冀北北岔沟门地区中生代侵入岩地质年代学和地球化学特征研究

    • 毛德宝（天津地质矿产研究所,天津,300170）　　　　　　陈志宏（天津地质矿产研究所,天津,300170;中国地质大学(北京),北京,100083）　　　　　　钟长汀（天津地质矿产研究所,天津,300170;中国地质大学(北京),北京,100083）　　　　　　左义成（天津地质矿产研究所,天津,300170）　　　　　　石森（中国地质调查局,北京,100035）　　　　　　胡小蝶（天津地质矿产研究所,天津,300170）

  • 基金项目:

    国土资源部"九五"资源与环境科技攻关项目(950200302)资助

Studies on the geochronology and geochemical characteristics of Mesozoic intrusions in Beichagoumen area, northern Hebei province

    摘要
  • 北岔沟门地区广泛分布中生代侵入岩体.本文选取了该地区有代表性的8个岩体进行地质年代学和地球化学研究,旨在建立其年代格架并探讨岩石的成因演化.主要岩石类型为闪长玢岩、花岗闪长岩、石英二长岩、二长花岗岩、钾长花岗岩等.颗粒级锆石的U-Pb同位素测年数据表明所研究的岩体主要有三期早三叠世(245～250Ma)、晚侏罗世(140～147Ma)和早白垩世(125～137Ma).地球化学数据表明岩石普遍具有较高的钾含量、准铝质,主要属高钾钙碱性系列,部分为橄榄玄粗岩系列.岩石不同程度地显示轻稀土元素富集、高场强元素(HFSE)和大离子亲石性元素(LILE)解偶等特点.进一步的岩石地球化学研究表明区内侵入岩可划分为高BaSr和低BaSr两种类型,其中高BaSr型具有高Al2O3(≥15%)、Sr(≥400×10-6) 和低Y(≤18×10-6)、Yb(≤1.9×10-6),高的Na2O/K2O(>1), Sr/Y(>20)、La/Yb(≥10)比值;较高的Mg#(38.47～57.78)、具正的或弱的铕负异常等地球化学特征,这些特征与埃达克岩具有某些相似性;而低BaSr型岩石SiO2、K2O、Y、Yb含量相对较高、Al2O3、Sr、Ba含量相对较低、具明显的铕负异常等地球化学特征.尽管两类岩石在时空上密切共生,但可能具有不同的源区和成因机制.综合研究表明本区中生代侵入岩总体形成在加厚地壳的构造背景下,与底侵作用或壳幔相互作用有关.
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修回日期:  2003-05-29
刊出日期:  2003-11-30

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