库鲁克塔格地区二长花岗岩锆石微量元素组成及地质意义
摘要
为进一步了解南天山造山带岩浆作用及构造演化,利用LA-ICPMS技术对库鲁克塔格地区阿訇开里得南二长花岗岩体进行锆石微量元素测试分析。该岩体锆石Th/U比值均大于0.4,稀土元素球粒陨石标准化图解中,重稀土元素均呈富集型并且具有明显的Eu负异常(Eu/Eu~*=0.1～0.58),轻稀土元素呈强烈亏损(La/Sm)_N=0.01～0.27,具有典型的岩浆锆石特征。根据锆石饱和温度(TZr)和Ti温度计算出该岩体结晶温度小于800℃,暗示该岩体形成于俯冲环境且有流体相加入。结合前人分析所得的U-Pb年龄数据340.6Ma(晚古生代),分析认为该岩体可能由俯冲过程中幔源岩浆底侵产生的余热使地壳发生重熔而形成。
引文
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[3]吴福元，李献华，杨进辉，郑永飞．花岗岩成因研究的若干问题[J]．岩石学报，2007,3(6):1217-1238．
[4]Liu HQ,Xu YG and He B.Lmplications from Zircon-Saturation Temperatures and Lithological Assemblages for Early Permian Thermal Anomaly in Northwest China.Lithos.2013,182-183:125-133
[5]Liu HQ,Lu YG and He B.Implications from Zircon-Saturationtemperatures and lithological Assemblages for Early Permian Thermalanomaly in Northwest China.Lithos,2013,82-183:125-133．
[6]Li N,Hen YJ,Irajno F,ong HJ,Ao SD and Ni ZY.LA-ICP-MS Zircon U-Pb Dating,Trace Element and Hf Isotopegeochemistry of the Heyu Granite Batholith,Astern Qinling,Entral China:Implications for Mesozoic Tectono-magmatic Evolution[J].Lithos,2012,42-143:34-47.
[7]尼加提·阿布都逊，郭瑞清，帕拉提·阿布都卡迪尔，等．新疆库鲁克塔格阿訇开里得南石炭纪花岗岩LA-ICP-MS锆石U-Pb定年及其地质意义[J]．地质通报，2013,32(2/3):251-259．
[8]葛荣峰.塔里木克拉通北缘库鲁克塔格地块前寒武纪构造-热事件与地壳演化[D]．南京大学，2014．
[9]赵振华.副矿物微量元素地球化学特征在成岩成矿作用研究中的应用[J].地学前缘,2010,17(1):267-286.
[10]Schulz B,lemd R and Br tz H.Host Rock Compositional Controlson Zircon Trace Element Signatures in Metabasites from the Austroalpine Basement[J].Geochimica et Cosmochimica Acta,2006(3):697-710.