We reconstructed the history of the Angara–Vitim batholith (AVB), characterized by the formation of huge volumes of granitic magma using thermochronological analysis (40Ar/39Ar, U/Pb) and math testing selected age milestones on the basis of the model crystallization differentiation and dynamics of heat and mass transfer in a magmatic chamber. The consolidation time of the granite melt is estimated to be in the range of 320–290 Ma. Events with age are distinguished based on the presence of isotope dating clusters T1 = 245 ± 1 Ma; T2 = 212 ± 1 Ma; T3 = 156 ± 1 Ma; T4 = 125 ± 2 Ma. The thermal history of samples corresponding to the modern erosion level immediately imposes strict restrictions on the history of consolidation and cooling for rocks corresponding to the deep (>20 km) levels of the magmatic chamber. Calculations show that the lifetime of the residual melt at the deep levels of the magmatic chamber of the AVB can reach 100 Ma. Events with age 245 ± 1, 212 ± 1, 156 ± 1, 125 ± 2 Ma reflect the gradual transformation of the “semi-frozen granite layer” and the discrete nature of its tectonic exposure to the upper level of the Earth’s crust under the influence of tangential elastic deformations caused by the pulsating manifestation of intraplate mantle magmatism within the Siberian platform and its folded frame. The final stage of AVB tectonic exposure to the Earth’s surface (as a solid body) occurred from 60 Ma to the present time, reflecting the process of origin and development of the Baikal rift system.

中文翻译：

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俄罗斯 Transbaikalia Angara-Vitim 花岗岩基岩的热年代学

我们重建了 Angara-Vitim 基岩 (AVB) 的历史，其特征是使用热年代学分析 (40Ar/39Ar, U/Pb) 和数学测试基于模型结晶分化选择的年龄里程碑形成大量花岗岩岩浆和岩浆室中传热和传质的动力学。花岗岩熔体的固结时间估计在 320-290 Ma 的范围内。根据同位素定年簇 T1 = 245 ± 1 Ma 的存在，区分随年龄变化的事件；T2 = 212±1 毫安；T3 = 156 ± 1 毫安；T4 = 125 ± 2 毫安。对应于现代侵蚀水平的样品的热历史立即对对应于岩浆房深（>20 km）水平的岩石的固结和冷却历史施加了严格的限制。计算表明，AVB岩浆房深部残余熔体的寿命可达100 Ma。年龄为 245 ± 1, 212 ± 1, 156 ± 1, 125 ± 2 Ma 的事件反映了“半冻花岗岩层”的逐渐转变及其构造暴露于地壳上层的离散性质由板内地幔岩浆在西伯利亚地台及其折叠框架内的脉动表现引起的切向弹性变形的影响。AVB 构造暴露于地球表面的最后阶段（作为固体）发生在 60 Ma 至今，反映了贝加尔湖裂谷系统的起源和发展过程。125±2 Ma反映了“半冻花岗岩层”的逐渐转变及其在地壳上层构造暴露的离散性质，其受板块内地幔岩浆作用脉动表现引起的切向弹性变形的影响。西伯利亚平台及其折叠框架。AVB 构造暴露于地球表面的最后阶段（作为固体）发生在 60 Ma 至今，反映了贝加尔湖裂谷系统的起源和发展过程。125±2 Ma反映了“半冻花岗岩层”的逐渐转变及其在地壳上层构造暴露的离散性质，其受板块内地幔岩浆作用脉动表现引起的切向弹性变形的影响。西伯利亚平台及其折叠框架。AVB 构造暴露于地球表面的最后阶段（作为固体）发生在 60 Ma 至今，反映了贝加尔湖裂谷系统的起源和发展过程。