韩宗珠,张贺,丁蒙蒙,塔金璐,徐翠玲,刘明

• 1:中国海洋大学海洋地球科学学院 海底科学与探测技术教育部重点实验室

摘要(Abstract)：

山东栖霞桃村地区出露中生代中酸性火山-侵入杂岩,对采自桃村地区青山组下段的中酸性火山-侵入岩以进行了岩石学和地球化学研究。桃村地区的中酸性火成岩的地球化学特征为:高钾低钠,高铝低镁;Cr,Co,Ni含量较低,Sr/Y及(La/Yb)N比值很高;微量元素蛛网图显示富集不相容元素K,Rb,Ba和Th,以及不相容元素Ce,Hf和Ti,亏损高场强元素Ta,Nb以及P;轻重稀土元素分馏程度高,具有类似埃达克岩的性质。综合分析其地球化学特征显示,青山组下段中酸性杂岩为增厚的下地壳熔融,这种地壳的增厚作用可能由古太平洋板块俯冲作用引起,而在俯冲作用过程中青山组中酸性杂岩的源岩被俯冲沉积物混染。

关键词(KeyWords)： 中酸性杂岩;埃达克岩;高Sr/Y;增厚地壳

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金面上项目(41072152)资助

作者(Author): 韩宗珠,张贺,丁蒙蒙,塔金璐,徐翠玲,刘明

DOI: 10.16441/j.cnki.hdxb.2013.01.010

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