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地质学报  2010 

鲁西新泰孟家屯2.7Ga变质沉积岩与黑云斜长片麻岩锆石Hf同位素特征

, PP. 991-1001

Keywords: 孟家屯岩组,变质沉积岩,黑云斜长片麻岩,锆石Hf同位素,构造岩浆事件

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Abstract:

对出露于山东新泰孟家屯2.7Ga的孟家屯岩组中石榴石石英岩(M08)、含十字石石榴石黑云母石英片岩(D242Y2)和黑云斜长片麻岩(M03)(TTG质片麻岩)进行锆石LuHf同位素分析。石榴石石英岩锆石核部??176?Lu/??177?Hf、??176?Hf/??177?Hf变化范围为0.001730~0.002546、0.281249~0.281360,锆石变质边部??176?Lu/??177?Hf、???176?Hf/???177?Hf变化范围为0.000123~0.002070、0.281241~0.281318;含十字石石榴石黑云母石英片岩锆石核部???176?Lu/???177?Hf、??176?Hf/??177?Hf变化范围为0.001334~0.002169、0.281226~0.281324,锆石变质边部??176?Lu/??177?Hf、???176?Hf/???177?Hf变化范围为0.000445~0.001375、0.281227~0.281309;黑云斜长片麻岩锆石??176?Lu/??177?Hf、??176?Hf/??177?Hf变化范围为0.000315~0.000847、0.281186~0.281265。孟家屯岩组石榴石英岩、含十字石石榴石黑去母石英片岩中碎屑(岩浆)锆石和黑云斜长片麻岩中岩浆锆石的ε??Hf?(?t?)分别为3.75~7.26、2.31~7.26和3.21~6.27,同时T??DM1?与其UPb年龄非常接近,表明它们起源于新生地壳的部分熔融。结合区域研究资料认为,2.7Ga是鲁西重要的一期构造岩浆热事件,也可能是华北克拉通重要的构造岩浆活动时期。变质沉积岩中许多变质增生锆石相对于核部岩浆锆石低??176?Lu/??177?Hf、高???176?Hf/???177?Hf,显示变质作用过程中石榴石的存在对锆石的LuHf同位素体系有很大影响。

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