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地质通报  2008 

大兴安岭北段牙克石地区玄武质火山岩的元素、同位素地球化学特征及其地质意义

, PP. 112-120

Keywords: 大兴安岭北段,牙克石地区,早白垩世火山岩,地球化学,岩石圈地幔

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Abstract:

牙克石地区出露一套早白垩世玄武质火山岩,其SiO2含量为52.81%~53.39%,K2O含量为1.86%~2.87%,岩性为玄武质粗面安山岩。富集大离子亲石元素Rb和Ba,高场强元素Nb和Ta亏损明显,Zr和Hf无明显异常,δEu为0.77~0.82。从同位素的特点看,(87Sr/86Sr)i变化于0.704762~0.704941之间,εNd(t)为2.00~2.54;在εNd(t)-(87Sr/86Sr)i图解上,样品投影点落入洋岛玄武岩(OIB)和美国盆岭省范围内。206Pb/204Pb为18.3288~18.4225,207Pb/204Pb为15.4566~15.4893,208Pb/204Pb为37.9401~38.0523;在207Pb/204Pb-206Pb/204Pb和208Pb/204Pb-206Pb/204Pb图解上,样品投影点都落在亏损洋中脊玄武岩地幔附近。综合考虑本区火山岩的地质、地球化学特点,认为其来源于被俯冲洋壳交代的岩石圈地幔。

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