摘要
五道溜河序列出露于中朝准地台北缘，由老至新分为四个单元：１０７２辉石闪长岩（ＹδＴ）、夹卵沟石英闪长岩（ＪδｏＴ）、宝石村二长花岗岩（ＢηγＴ），孤石沟花岗岩（ＧδＴ）。该序列生成于晚三叠世，大约经历了１０Ｍａ（２０１．５至１９２Ｍａ）的时间。四个单元具有明显的演化规律：矿物成分表现为钾长石、石英递增，斜长石Ａｎ值递减；宕石化学表现为ＳｉＯ＿２递增，ＣａＯ、ＭｇＯ递减；微量元素Ｔｉ、Ｖ、Ｃｏ、Ｎｉ、Ｃｕ为递减；稀土配分曲线由平坦型向右倾型演变。五道溜河岩体的就位机制经历了底辟—膨胀热气球—刺穿等阶段。五道溜河序列的建立对于研究两个大地构造单元的演化历史及吉林省晚印支期侵入岩的对比有着重要的意义。
The outcrop of the Wudaoliuhe stratigraphic sequence lies on the northern margin ofSino-Korean paraplatform. They are divided into four units from old to young : 1072 dioritewith pyroxne(YST ) ,the Jialuangou quartz diorite(JδOT ) ,the Baoshichun adamellite(BηRT)and the Gushigou granite(GRT).The stratigraphic sequence was formed in the lateTriaassic,which underwent through 10 Ma(From 201. 5 to 192Ma).Four units have obviousan evolutionary law:showing K-feldspar,quartz progressivly in mineralogical composition.Lithochemistry shows progressive increase of SiO_2,progressive decrease of CaO,MGO as wellas decrease of microelement Ti,V, Co, Ni amd Cu. The curves of REE distribution evolvedfrom flat type to right dip type. The emplacement mechanism of the Wudaoliuhe rocks underwent diapir-thermalexpan-sion ballon-diapiric injection.The forming of the Wudaoliuhe stratigraphic sequence has an important significance forstudying the evolution of two geotectonic units and comparison of the late Indo-Chinese e-poch intrusive rocks in Jilin province.
出处
《吉林地质》
1994年第1期51-59,共9页
Jilin Geology
关键词
五道溜河序列
岩体
侵入体
地台
The Wudaoliuhe stratigraphic sequence Uint Rockbody IntrusivesThermal expansion ballon
