吉林大学学报(地球科学版) ›› 2021, Vol. 51 ›› Issue (1): 126-140.doi: 10.13278/j.cnki.jjuese.20190065
• 地质与资源 • 上一篇
陆胜1,2, 王可勇2, 赵焕利3, 相雷1, 刘阳1, 张志博1
Lu Sheng1,2, Wang Keyong2, Zhao Huanli3, Xiang Lei1, Liu Yang1, Zhang Zhibo1
摘要: 前哨林场大地构造上位于大兴安岭北段额尔古纳地块北部的漠河前陆盆地边缘。本文研究了大兴安岭漠河前哨林场侵入岩的岩相学、年代学及岩石地球化学特征,探讨了研究区内侵入岩的形成时代、岩石成因及其构造环境。LA-ICP-MS锆石U-Pb定年结果表明,花岗岩形成于199.9~199.3 Ma、辉长岩形成于(201.8±2.6) Ma,即研究区内的花岗岩、辉长岩均形成于晚三叠世—早侏罗世。岩石地球化学研究表明:花岗岩的w(SiO2)为63.22%~70.10%,w(Al2O3)为12.43%~14.36%,里特曼指数(σ)为0.74~1.65,属高钾钙碱性系列岩石,具有较低的Mg#值(平均值为39.43),w(TFeO)为2.80%~4.41%,w(CaO)为1.47%~3.38%,轻重稀土分馏明显,富集轻稀土,亏损重稀土,δEu为0.48~0.84,富集Rb、Ta、K、La、Nd、Zr、Ti等元素,相对亏损Th、U、Sr、P、Eu等元素;辉长岩的w(SiO2)为51.42%~51.98%,w(Al2O3)为17.24%~17.73%,里特曼指数(σ)为3.00~3.53,属高钾钙碱性系列岩石,具有较高的Mg#值(平均值为51.07),w(TFeO)为9.06%~9.14%,w(CaO)为5.81%~6.69%,重稀土分馏不明显,δEu为0.86~0.98,富集Rb、Ta、Nb、Nd等元素,相对亏损Th、U、P、Eu等元素。上述岩石地球化学特征表明,花岗岩为辉长岩结晶分异的产物,原始岩浆起源于地幔,并受地壳物质的混染改造。研究区侵入岩形成于造山阶段挤压环境,是蒙古—鄂霍茨克洋俯冲碰撞的产物。
中图分类号:
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