皖南屯溪地区发现晚侏罗世火山岩  

LATE JURASSIC VOLCANICS DISCOVERED IN THE TUNXI AREA OF SOUTH ANHUI

作　　者：任鑫鑫[1,2] 黄建东 刘佳 毕治国[3] 

机构地区：[1]安徽省地质博物馆,安徽合肥230001 [2]合肥工业大学资源与环境工程学院,安徽合肥230009 [3]安徽省地质矿产勘查局327地质队,安徽合肥231607

出　　处：《安徽地质》2015年第4期241-244,共4页Geology of Anhui

摘　　要：屯溪盆地洪琴组红层之上广泛分布着一套火山岩系,岩性上以中酸性的火山碎屑岩、火山熔岩为主。最初认为其属早白垩世石岭组双峰式喷发的一部分,进一步研究后认为其不整合于炳丘组之下,且岩性上区别于石岭组火山岩,经锆石U-Pb法定年确定时代上为晚侏罗世晚期,定名屯溪组。The Hongqin Formation of red bed in the ~Funxi Basin is overiain by a series of volcanics widely, which are mainly of intermediate-acid volcanoclastic rock and volcanic lava. These rocks were previously thought to be a part of bimodal type eruption of early Cretaceous Shiling Formation, however, by further study they are found unconformably underlying the Bingqiu Formation and different from the Shiling Formation of volcanics in lithology and determined as old as late Late Jurassic by zircon U-Pb dating and named the Tunxi Formation.

关 键 词：火山岩 晚侏罗世 屯溪地区 

分 类 号：P534[天文地球—古生物学与地层学]