福建省侏罗纪-白垩纪花岗岩角闪石-斜长石矿物温压计的地质意义  

Implication of Amphibole-plagioclase Geobarometry of JurassicCretaceous Granite,Fujian Province,China

作　　者：黎敦朋[1] 肖爱芳[1] 刘文元[1] 

机构地区：[1]福州大学紫金矿业学院,福建福州350108

出　　处：《东华理工大学学报（自然科学版）》2014年第4期351-359,共9页Journal of East China University of Technology(Natural Science)

基　　金：福建省自然科学基金"福建省不同构造单元的剥露幅度及其成因机制研究"(2010J01256)

摘　　要：应用电子探针分析和角闪石-斜长石温压计,得出闽西南构造带出露于地表不同时期花岗岩的结晶压力分别为早侏罗世花岗岩431.3 MPa、晚侏罗世花岗岩187.2 MPa、早白垩世花岗岩108.3 MPa,对应的花岗岩结晶深度分别为16 km,7 km,4 km;闽东构造带出露于地表的不同时期花岗岩结晶压力分别为晚侏罗世花岗岩186.8 MPa、早白垩世花岗岩89.5MPa,对应的花岗岩结晶深度分别为7 km,3 km。结果表明,闽东构造带与闽西南构造带侏罗纪以来的差异隆升作用不明显;同时得出研究区中晚侏罗世（175.6-145.5 Ma）的隆升剥露幅度约为9 km,对应的地壳隆升速率约为300 m/Ma;早白垩世（145.5-99.6 Ma）的隆升剥露幅度约为3-4 km,对应的地壳隆升速率约为65-87 m/Ma;晚白垩世以来（99.6-0Ma）的隆升剥露幅度约为3-4 km,对应的地壳隆升速率约为30-40 m/Ma,显示侏罗纪以来地壳隆升剥露幅度和隆升速率逐渐减小的规律,这对东南沿海中新生代构造演化研究提供了重要新资料。Electron probe analysis and Amphibole-plagioclase geobarometry are employed to study of outcrop granites of south tectonic belt and southwestern tectonic belt of Fujian province.As a result,the crystallization pressures of outcrop granites of southwestern tectonic belt are obtained crystallization pressures of early Jurassic 431.3MPa,late Jurassic 187.2 MPa and early Cretaceous 108.3 MPa,and the corresponding intrusive depths are ca.16 km,7 km,4 km,and the crystallization pressures of outcrop granites of south tectonic belt are obtained crystallization pressures of late Jurassic 186.8 MPa and early Cretaceous 89.5 MPa,and the corresponding intrusive depths are ca.7 km and 3 km.On the other than,the uplift and exhumation range of about 9km and rate of about300 m / Ma was obtained in middle-late Jurassic（175.6 - 145.5 Ma）,and the uplift and exhumation range of about 3 - 4 km and rate of about 65 - 87 m / Ma was obtained in early Cretaceous（145.5 - 99.6 Ma）,and the uplift and exhumation range of about 3 - 4km and rate of about 30 - 40 m / Ma was obtained since late Cretaceous（99.6 - 0 Ma）.This implies that middle-late Jurassic（175.6 - 145.5 Ma） had a strong uplift and exhumation in the study area.It provides important new information for tectonic evolution of China＇s southeast coast in Mesozoic and Cenozoic.

关 键 词：角闪石-斜长石温压计 隆升 构造带 福建 

分 类 号：P619.222[天文地球—矿床学]