摘要
依据地质填图和实测剖面获得的资料 ,对羌塘地体阿木岗群的层序特征、岩石地球化学特征、变质作用特征等方面进行了研究 ,并根据变质岩与盖层之间的角度不整合关系 ,火山 -沉积变质岩的Sm -Nd年龄对阿木岗群的原岩时代和变质年龄进行了重新厘定 ,得出其原岩为一套陆源碎屑岩和少量火山岩 ,经历了三期变质作用的演化 ,火山 -沉积变质岩Sm -Nd年龄为 2 68.6Ma。
On the basis of the actual data obtained from geological mapping and measured section, the authors have studied the succession, petrochemistry and metamorphism of Amugang group According to the angular discordance between metamorphic rocks and cap rocks and the Sm-Nd age of volcano-sedimentary metamorphic rock, the ages of primitive rock and metamorphism of Amugang group can be ascertained again The results are that primitive rocks are a set of terrigemous detrital rocks and minor volcanic rocks, which suffered from three stages of metamorphism, the Sm-Nd age of volcano-sedimentary metamorphic rock is 268.6 Ma.
出处
《世界地质》
CAS
CSCD
2000年第1期1-7,共7页
World Geology
