文档介绍：太原理工大学硕士研究生学位论文 La/Yb比值和无Eu异常,相对富集Rb、Ba和K等大离子亲石元素,相对亏损Nb、Ta、Zr、Hf、Ti等高场强元素,高Sr、贫Y和Yb、高Sr/Y值、高 La/Yb值等主量元素和微量元素特征,其成因类型为C型埃达克岩中的高钾钙碱性埃达克质火山岩。太白维山与塔地张家口组向阳村段火山岩,二者均具有富硅、富钾富碱、富铁贫镁,右倾海鸥型REE配分型式和显著的负 Eu异常,富集高场强元素,强烈亏损Sr、Ba、Nb、Ti和P等元素的主量元素和微量元素特征,成因类型为成分相当于A2型花岗岩类中准铝质A型花岗岩的火山岩。 4、灵丘地区太白维山和塔地张家口组火山岩形成于晚中生代华北克拉通东部由挤压造山一伸展减薄的构造转换过程,受控于古太平洋板块向欧亚板块下的俯冲作用。太白维山张家口组抢风岭段火山岩的岩浆来源于晚造山挤压阶段陆内地壳加厚基性下地壳的低一中等程度的部分熔融;太白维山和塔地张家口组向阳村段火山岩的岩浆来源于造山后的陆内拉张伸展过程中硅铝层地壳在低压下的部分熔融。灵丘地区晚中生代深部经历了基性下地壳部分熔融和硅铝层地壳部分熔融的岩浆作用过程。关键词:太白维山,塔地,中生代,埃达克岩,A型花岗岩,地球化学万方数据太原理工大学硕士研究生学位论文 PETROLOGICAL CHAR ACTERISTICS AND TECTONIC SI(]NIFICANCE OF EARI YCRETACEOUS VOLCANIC ROCKS INTAIBAI MOUNTAIN AND TADI LINGQIU SHAN XIPROVINCE ABSTRACT Lingqiu islocated inthe southwestern end of Yanshan tectonic belt,the transition/conversion ofthe north near EW Yanshan mountains and south NE Taihang the basis of detailed geological field work,and by studying thegeological characteristics、the spatial and temporal characteristics and petrography of Taibai Mountains volcanic basins and Tadi volcanic bining with itsmaj or elements,REE and trace element geochemistry analysis,the auther discussed theVolcanic edifice features、the petrological characteristics andthe causes ofvolcanicrocks,magmatic material sources,tectonic environment and dynamic background ofearly Cretaceous volcanic rocks in Taibai mountains and Tadi,I have mainly obtained the following options: volcanic rocks inTaibai mountains andTadi are theproduct ofthe same period thatboth ofwhich are formed intheEarly main rock types inqiangfengling body ofzhangjiakou group of Taibai mountain are trachyte,mattedacite,rhyolite and few volcanic clasticrock、and themain rock III 万方数据太原理工大学硕士研究生学位论文 types in xiangyangcun body of which are rhyolite and Rhyolitic ignimbrite;While in Tadi,the qiangfengling body are mainly consist ofThe pyroclastic rock and Terrigenous clasticrockand thexiangyangcun body are mainly consist ofpyroclastic intensity ofv