广西栗木泡水岭印支期岩体LA-ICP-MS锆石U-Pb年龄及其地质意义

摘要

广西栗木泡水岭花岗岩LA-ICP-MS锆石U-Pb年龄显示，泡水岭花岗岩体可能存在3期岩浆活动：210Ma、222Ma和239Ma，佐证了栗木岩体是印支期岩浆活动的产物。结合最新的研究，栗木花岗岩体形成于印支期，岩浆活动集中在210Ma±4Ma~222Ma±5Ma之间，并且在239.8Ma±4.3Ma可能存在印支早期的岩浆活动。%LA-ICP-MS zircon U-Pb ages of granite in Paoshuiling of Limu indicate that the Paoshuiling granite was produced by Indosinian magmatism and probably formed in three stages of magmatic activities, which occurred at 210Ma, 222Ma and 239Ma re-spectively. Combined with the latest research, the authors hold that Limu granite was formed in Indosinian period and the magmatic activities were concentrated between 210Ma ± 4Ma and 222Ma ± 5Ma. In addition, the age of 239.8Ma ± 4.3Ma might represent the early Indosinian magmatic activity.