第51卷第1期2023年2月福州大学学报(自然科学版)JournalofFuzhouUniversity(NaturalScienceEdition)Vol.51No.1Feb.2023DOI:10.7631/issn.1000-2243.22008文章编号:1000-2243(2023)01-0118-07福建省新生代玄武岩40Ar/39Ar年代学及地质意义严率旗,张文慧,王力圆,聂俊韬(福州大学紫金地质与矿业学院,福建福州350108)摘要:对福建省沿海至内陆出露的4件新生代玄武岩进行40Ar/39Ar年龄测试,对玄武岩中橄榄石斑晶进行电子探针测试;其中洋底和柳城玄武岩首次获得精确的40Ar/39Ar年龄数据.结果显示,闽西明溪40Ar/39Ar年龄数据为(1.44±0.11)Ma,柳城为(17.35±0.93)Ma;闽中洋底玄武岩年龄为(11.71±0.44)Ma;闽东厦门玄武岩年龄为(17.0±0.36)Ma.结合前人年龄数据,福建省新生代玄武岩整体表现出从闽东至闽西年龄逐渐减小的趋势.橄榄石斑晶电子探针数据显示闽东至闽西玄武岩碱性程度逐渐增加,可能指示岩浆熔融程度由沿海至内陆逐渐减少,岩石圈厚度由东向西逐渐增厚.最新获得的闽西柳城玄武岩40Ar-39Ar年龄为(17.35±0.93)Ma,与东部沿海玄武岩相似,推测可能是太平洋板块北西向俯冲时引起的岩浆扰动作用形成的.关键词:新生代玄武岩;40Ar/39Ar年龄;地质意义;橄榄石斑晶;福建省中图分类号:P597.3(257)文献标识码:A40Ar/39AragecharacteristicsofCenozoicbasaltsinFujianProvinceYANShuaiqi,ZHANGWenhui,WANGLiyuan,NIEJuntao(ZijinSchoolofGeologyandMining,FuzhouUniversity,Fuzhou,Fujian350108,China)Abstract:40Ar/39Aragetestswerecarriedouton4CenozoicbasaltsexposedfromthecoasttoinlandinFujianProvince.Theelectronprobetestwascarriedoutfortheolivinephenocrystsinthebasalts.Amongthem,theoceanfloorandLiuchengbasaltsobtainedaccurate40Ar/39Aragesforthefirsttime.Theresultsshowthattheageof40Ar/39ArinMingxiinWesternFujianis(1.44±0.11)Ma,andthatinLiuchengis(17.35±0.93)Ma.TheageofoceanicbottombasaltinCentralFujianis(11.71±0.44)Ma,andtheageofXiamenbasaltinEasternFujianis(17.0±0.36)Ma.Combinedwiththeagedataofpredecessors,theCenozoicbasaltsinFujianProvinceasawholeshowadecreasingtrendfromEasternFujiantoWesternFujian.TheolivinephenocrystelectronprobedatashowthatthealkalinityofbasaltsinEasternFujiantoWesternFujiangraduallyincreases,whichma...