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地质通报  2008 

辽西凌源地区义县组火山岩锆石U-Pb年代学和地球化学特征

, PP. 364-373

Keywords: 辽西凌源地区,义县组火山岩,埃达克岩

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Abstract:

对辽西凌源地区义县组的1件流纹岩样品进行锆石U-Pb年代学研究,获得的年龄为(124.4±1.4)Ma,与前人对辽西北票、义县、凌源等地区通过K-Ar、Ar-Ar、U-Pb等定年方法获得的义县组年龄基本一致,时代为早白垩世。7件典型火山岩样品的地球化学研究结果表明,该火山岩的SiO2=65.6%~73.4%,MgO=0.35%~1.23%,Mg#=16~41,Al2O3=13.40%~16.79%,Na2O=3.54%~4.26%。Sr=(445~774)×10-6,Yb=(0.51~0.97)×10-6,Y=(7~14)×10-6,Sr/Y=49~66,LaN/YbN=33~48,高Sr和Sr/Y比值,低Y和Yb,轻重稀土元素分异明显,显示出埃达克岩的地球化学特征,但其Mg#较低。它们可能是加厚的基性下地壳部分熔融的产物。

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