阿尔卑斯古近纪火山活动的沉积记录及其地质意义  

Sedimentary Records of Volcanic Activity in Paleogene of Alps and Geological Significance

作　　者：芦刚 高亮 王长城[1] 陈兴聪 卢喜和 Wilfried Winkler Lu Gang;Gao Liang;Wang Changcheng;Chen Xingcong;Lu Xihe;Winkler Wilfried(College of Energy,Chengdu University of Technology,Chengdu 610059,China;School of Petroleum Engineering,Shandong Institute of Petroleum and Chemical Technology,Dongying 257061,China;Eidgenössische Technische Hochschule,Zürich 8092,Switzerland)

机构地区：[1]成都理工大学能源学院,四川成都610059 [2]山东石油化工学院石油工程学院,山东东营257061 [3]瑞士苏黎世联邦理工大学,瑞士苏黎世8092

出　　处：《地球科学》2025年第1期77-87,共11页Earth Science

基　　金：山东省自然科学基金项目(No.ZR2022MD117);留学基金委项目(No.201406400047)。

摘　　要：在始新世中期至渐新世早期,欧洲板块和亚得里亚板块发生碰撞,导致了阿尔卑斯造山带的大规模岩浆活动,由于后期隆升剥蚀无法保存,而弧后盆地中同时期的沉积火山碎屑岩记录了这一构造事件.针对该套沉积火山碎屑岩,开展了地质年代学与地球化学等方面的研究,揭示了阿尔卑斯造山带的火山活动和构造演化特征.研究表明火山碎屑岩中的锆石年龄峰值主要集中在~47 Ma、40 Ma和37 Ma,并且锆石的Hf同位素呈现负值,说明其主要形成于板块俯冲过程中部分地壳熔融的岩浆中.此外,通过对岩浆锆石同位素计算地壳厚度的变化,说明了阿尔卑斯造山带不仅存在由于板块俯冲碰撞引起的地壳垂直挤压增厚,还存在俯冲板片拉伸引起的地壳伸展变薄.During the Middle Eocene to Early Oligocene,the collision between the European and Adriatic plates led to large-scale magmatic activity in the Alpine orogenic belt,and pyroclastic rocks were recorded in the back arc basin.This study focuses on the geochronology and geochemistry of pyroclastic rocks,and reveals the volcanic activity and structural evolution characteristics of the Alpine orogenic belt.The results indicate that the peak ages of zircons in pyroclastic rocks are mainly concentrated at~47 Ma,40 Ma,and 37 Ma.The Hf isotopes of zircons show negative values.It indicates that they were mainly formed in magma with partially melted crust during plate subduction.In addition,the crustal thickness was calculated by using magmatic zircon isotopes.It is demonstrated that the Alpine orogenic belt experienced not only vertical crustal compression thickening caused by plate subduction and collision,but also crustal extension thinning caused by plate stretching.

关 键 词：火山碎屑岩 岩浆锆石 U-Pb年龄 Eu值 地壳厚度 地质年代学 地球化学 

分 类 号：P58[天文地球—岩石学]