【摘要】 浙江浦江县蒙山剖面陈塘坞组凝灰岩样品高精度SHRIMP锆石U-Pb年龄分别为825.3Ma±8.1Ma和830Ma±6Ma,结合江绍断裂带以北的赣西地区修水组凝灰岩获得的SHRIMP锆石U-Pb年龄824Ma±5Ma和星子岩群流纹岩中锆石U-Pb年龄825Ma±5Ma,以及庐山筲箕洼组细碧岩的SHRIMP锆石U-Pb年龄840Ma±6 Ma、流纹岩年龄833Ma±4Ma和831Ma±3Ma,将蒙山剖面陈塘坞组和蒙山组明确定位于820Ma之下,双溪坞群之上的地层单元,从传统的平水群体系中独立出来;并将蒙山剖面陈塘坞组之下的蒙山组枕状玄武岩、细碧岩与庐山地区筲箕洼组枕状玄武岩、细碧岩地层序列对比。陈塘坞组年龄的确定对江绍断裂带区域新元古代地层对比和构造演化具有重要意义。更多还原

【Abstract】 Zircon ages(825Ma±5 Ma) and(830Ma±6 Ma) of tuff in the Chentangwu Formation are reported for the first time from the "Pingshui Group" in Pujiang County,Zhejiang Province.In combination with the SHRIMP U-Pb age(824Ma±5 Ma) of the tuff from the Xiushui Formation and 825Ma±5 Ma of the rhyolite from Xingzi complex Group and the SHRIMP U-Pb age 840Ma±6 Ma of the spilite,the U-Pb ages of the rhyolite(833Ma±4Ma and 831Ma±3Ma) in the Shaoqiwa Formation of the Lushan Mountain in the north part of the Jiang-Shao fault zone,the Chentangwu Formation should be located below the Wuling Movement at 820 Ma and just above the Zhangcun Formation of the Shuangxiwu Group,not belonging to the traditional Pingshui Group.The authors consider that the Mengshan Formation,which is below the Chentangwu Formation,is correlated with the lava pillow and spilite of the Shaoqiwa Formation in Lushan area.The reconfirmed age of the Chentangwu Formation is of important significance for the stratigraphic correlation and tectonic evolution study in the Jiang-Shao fault zone.更多还原