北京房山岩体形成过程中的岩浆混合作用证据

覃锋[1,2] 徐晓霞[1,3] 罗照华. 北京房山岩体形成过程中的岩浆混合作用证据[J]. 岩石学报, 2006, 22(12): 2957-2970.
引用本文: 覃锋[1,2] 徐晓霞[1,3] 罗照华. 北京房山岩体形成过程中的岩浆混合作用证据[J]. 岩石学报, 2006, 22(12): 2957-2970.
QIN Feng, XU XiaoXia, LUO ZhaoHua. Mixing and mingling in petrogenesis of the Fangshan intrusion, Beijing[J]. Acta Petrologica Sinica, 2006, 22(12): 2957-2970.
Citation: QIN Feng, XU XiaoXia, LUO ZhaoHua. Mixing and mingling in petrogenesis of the Fangshan intrusion, Beijing[J]. Acta Petrologica Sinica, 2006, 22(12): 2957-2970.

北京房山岩体形成过程中的岩浆混合作用证据

  • 基金项目:

    国家自然科学基金重点项目(40434010),科技部基础性工作项目“国家岩矿化石标本描述标准和规范的研究制定”(2003DEA3N025),中国地质大学“创新杯”项目致谢中国科学院地质与地球物理研究所张旗教授、周云生先生在本文写作过程中提供了不少建设性的意见,两位不知名的评阅人详细审阅了全文并提出了中肯的意见和建议,在此一并表示感谢!

Mixing and mingling in petrogenesis of the Fangshan intrusion, Beijing

  • 北京房山侵入岩体主要由石英二长闪长岩单元和三种不同结构的花岗闪长岩单元组成,岩体中广泛分布的镁铁质微粒包体、富集暗色矿物的线状条带以及各岩相单元的非渐变接触关系等宏观特征,指示岩体的形成与岩浆混合作用有密切联系。122个斜长石成分剖面电子探针分析表明,它们众数成分为An=29的更长石。但是,其成分变化范围极宽(An=14~56),晶体内不同部位的成分有很大差剐,出现正常环带的An值较低(14~42),内环带的An值较高(24~56)的特殊情况,指示斜长石结晶环境的改变,暗示具有富钙基性岩浆的加入。从岩体边部到中心,斜长石An牌号逐渐降低,但相邻岩相单元之间有较大的重叠,表明不同岩石单元中的斜长石成分主要受控于岩浆成分的变化,与分离结晶作用无关。斜长石的韵律性环带、特别是内环带的发育则是岩浆混合作用机制的有力证据。基性岩浆的反复注入不仅改变寄主岩浆的成分,而且也控制了它的温度、定位机制和岩石的结构特征。因此,房山岩体的形成过程还包含了镁铁质岩浆多次注入的历史,并且从外到里基性岩浆的作用逐渐减弱。
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出版历程
收稿日期:  2006-01-12
修回日期:  2006-11-07
刊出日期:  2006-12-31

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