吉林大学学报(地球科学版) ›› 2020, Vol. 50 ›› Issue (6): 1720-1736.doi: 10.13278/j.cnki.jjuese.20190174
• 地质与资源 • 上一篇
董洋, 刘苏, 张思佳
Dong Yang, Liu Su, Zhang Sijia
摘要: 辽东半岛岫岩王家堡子地区位于胶-辽-吉造山/活动带中段。本文对该区内的二长花岗岩(龙潭沟岩体与罗圈沟岩体)进行了U-Pb年代学与地球化学特征研究,并探讨了其地质意义。结果表明:龙潭沟岩体与罗圈沟岩体侵位年龄分别为(122.37±0.30)Ma和(124.37±0.91)Ma,年代为早白垩世;二岩体具高SiO2质量分数,低Mg、Co、Cr、Ni质量分数,富集LREE和LILE,亏损HFSE,说明二者为地壳物质熔融的产物;高Al2O3、K2O质量分数,低Na2O、MnO和CaO质量分数,高Sr质量分数,低Y、Yb质量分数,富集LILE及LREE,Eu呈负异常,亏损HREE等地球化学特征,也表明二者具有埃达克岩与高钾钙碱性I型花岗岩的性质。龙潭沟岩体岩浆来源于洋壳俯冲导致的加厚陆壳底部基性岩部分熔融,而罗圈沟岩体岩浆则是俯冲洋壳导致地幔物质上涌,使得玄武质下地壳发生部分熔融的结果,并且岩浆受到了地幔橄榄岩的混染。认为龙潭沟岩体与罗圈沟岩体均为碰撞环境中的产物,辽东岫岩王家堡子地区在124~122 Ma处于由古太平洋板块俯冲引起的挤压环境中,构造挤压向拉伸环境的转换应在122~110 Ma之间完成,岩石圈的减薄与破坏也随之开始。
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