摘要
目的 揭示南秦岭勉略带北部迷坝岩体的地球化学特征及其地质意义。方法 利用元素地球化学资料,结合岩体地质和岩相学特征进行研究。结果 岩体相对富集大离子亲石元素和轻稀土元素,亏损高场强元素,K2O+Na2O和Sr含量及Zr/Y值较高;岩体具后碰撞高钾钙碱性花岗岩的特征;岩体是由二元岩浆尚未彻底混合而形成的。结论 指示晚三叠世秦岭造山带华北与扬子板块碰撞造山作用已进入到后碰撞演化阶段。
AimTo investigate the geochemical characteristics of Miba intrusion and its geological significance.MethodsThe investigation is not based solely on chemical criteria,but also on the field ,petrograhical.ResultsMiba granitoids is enriched in LILE and LREE, and relatively depleted in HFSE with high (K_2O+Na_2O),Sr and Zr/Y ratio.ConclusionMiba granitoids is similar to the post-collision granitoids;Miba intrusion had been formed by mixing of two-end magmas;the collision between the South Qinling micro-plate and Yangtze plate had been ended at the age of 220 Ma and then entered into a stage of post-collision.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2004年第3期325-330,共6页
Journal of Northwest University（Natural Science Edition）
基金
国家自然科学基金资助项目(40372039
49732080)
关键词
后碰撞花岗岩
地球化学
二元岩浆混合
南秦岭
post-collisional granite
geochemistry
mixing of two-end magmas
South Qinling
