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阿尔泰北部大面积出露的喀纳斯群为一套巨厚的浅变质陆缘碎屑岩,本次工作系统采集了锆石同位素年龄样品及岩石地球化学样品,其地球化学分析结果显示沉积物来源于被动大陆边缘环境;获得的碎屑锆石U-Pb同位素年龄资料中,最年轻的岩浆锆石年龄为(545.8±3.7)Ma,据此可将喀纳斯群的底界定为震旦系;较老的元古代锆石年龄(858±13 Ma及1 800~1 983Ma)暗示了物源区很可能存在前寒武纪大陆地壳基底。
Kanas, a large area exposed to the north of Altai, is a large set of superficial metamorphic marginal clastic rocks. This work system collects zircon isotope age samples and petrochemical geochemical samples. The geochemical analysis shows that sediments From the marginal environment of the passive continental margin. Among the obtained zircon U-Pb isotopic ages of detritus, the youngest magmatic zircon age is (545.8 ± 3.7) Ma, from which the bottom of Kanas can be defined as Sinian The older Proterozoic zircon ages (858 ± 13 Ma and 1 800 ~ 1 983 Ma) suggest that the Precambrian continental crust basement probably exists in the provenance area.