摘要
对黑龙江省东部敦—密断裂以南的太平岭边缘隆起带上的黄松群杨木组石榴黑云片岩和阎王殿组黑云石英片岩进行了锆石LA-ICP-MS U-Pb测年,结果表明:杨木组石榴黑云片岩中锆石^(206)Pb/^(238)U加权平均峰值年龄分别为281.8 Ma、317.2 Ma、424.7 Ma、529.3 Ma;阎王殿组黑云石英片岩中锆石^(206)Pb/^(238)U加权平均峰值年龄分别为310.4 Ma、384.4 Ma、484.7 Ma;两个组所获得的最年轻的锆石^(206)Pb/^(238)U年龄分别为280±4 Ma和285±8 Ma。此外,前人对黄松群研究结果表明其变质作用时代为晚二叠世—早三叠世。因此,黄松群时代为二叠纪,海西期和加里东期岩浆岩构成了黄松群沉积物源的主体。
This study presents LA-ICP-MS zircon U-Pb ages for garnet biotite schist from the Yangmu Formation and biotite quartz schist from the Yanwangdian Formation of Huangsong Group,located in Taipingling uplift belt in the south of Dunhua-Mishan fault,eastern Heilongjiang Province. Dating results show that the ^（206）Pb/^（238）U weighted mean age of zircons for garnet biotite schist from the Yangmu Formation were 281. 8 Ma,317. 2 Ma,424. 7 Ma and 529. 3 Ma,respectively. The ^（206）Pb/^（238）U weighted mean age of zircons for biotite quartz schist from the Yanwangdian Formation were 310. 4 Ma,384. 4 Ma and 484. 7 Ma. The youngest zircon ^（206）Pb/^（238）U age gained from the two formations are 280 ± 4 Ma and 285 ± 8 Ma,respectively. Furthermore,the previous research showed that the metamorphic age of Huangsong Group was the Late Permian- Early Triassic. The above results show that the rocks within Huangsong Group formed during the Permian. Additionally,the main sedimentary source of the Huangsong Group is dominated by the Hercynian and Caledonian magmatite.
出处
《世界地质》
CAS
2016年第1期66-76,共11页
World Geology
基金
中国地质调查局项目(1212011120329)和(12120113098100)联合资助
