Constraint on the temperature of A-type magma from contact metamorphic aureole, Biesituobie batholith, West Junggar in NW China, Central Asian Orogenic Belt (Online Published)
Constraint on the temperature of A-type magma from contact metamorphic aureole, Biesituobie batholith, West Junggar in NW China, Central Asian Orogenic Belt (Online Published)
复制标题
中亚造山带西准噶尔别斯托别基体接触变质光环A型岩浆温度约束（网络出版）
DOI：
10.1130/b36541.1
复制
发表时间：
--
影响因子：
4.9
通讯作者：
Chunming Wu
中科院分区：
文献类型：
--
作者：
Yichao Chen;Jiahui Liu;Renjie Zhou;Wenjiao Xiao;Ji’en Zhang;Zhiyong Zhang;Qian W.L. Zhang;Zhen M.G. Li;Chunming Wu
中亚造山带西准噶尔别斯图别a型基含接触变质光圈衍生的变质长捕虏体。捕虏体可分为黑云母-白云母-红柱石角砾岩和堇青石-碱性长石-硅长石-刚玉片麻岩两种类型，具有进变质作用。对堇青石-碱性长石-硅长石-刚玉片麻质样品进行相平衡建模，峰条件为P = 3.0 ~ 4.0 kbar, T = 760 ~ 800℃。同样，na -in-堇青石地温计的峰值条件为T = 771 ~ 780°C。该变质峰温度可作为别斯图别a型岩基温度的下限。而Biesituobie a型基岩锆石的ti -in-锆石地温计测得的平均温度为672±22℃。说明ti -in-锆石地温计在a型岩浆上的应用可能低估了1 ~ 100℃。锆石U-Pb测年表明，接触变质作用年龄在263 ~ 286 Ma之间，与274 Ma的岩体年龄一致。从别斯图别岩体的接触变质光晕计算出760 ~ 800℃的结果，为从变质约束考虑a型花岗岩系列温度条件提供了下限。
The Biesituobie A-type batholith in West Junggar in NW China of the Central Asian Orogenic Belt contains metapelite xenoliths derived from the contact metamorphic aureole. These xenoliths could be divided into two types: biotite-muscovite-andalusite hornfels and cordierite-alkaline feldspar-sillimanite-corundum gneiss, indicating prograde metamorphism. The phase equilibrium modeling on the cordierite-alkaline feldspar-sillimanite-corundum gneiss sample yielded a peak condition of P = 3.0−4.0 kbar, T = 760−800 °C. Similarly, the Na-in-cordierite geothermometer yielded a peak condition of T = 771−780 °C. The temperature of the peak metamorphism could be considered as a lower limit of the temperature of the Biesituobie A-type batholith. On the contrary, the Ti-in-zircon geothermometer applied to the Biesituobie A-type batholith zircons yields a mean temperature of 672 ± 22 °C. It suggested that the application of Ti-in-zircon geothermometer on A-type magma may involve a >100 °C underestimation. Zircon U-Pb dating indicates that the age of the contact metamorphism is between 263 and 286 Ma, consistent with the age of the pluton at 274 Ma. The result of 760−800 °C calculated from the contact metamorphic aureole of the Biesituobie batholith put a lower limit on considering the temperature condition of the A-type granite series from a metamorphic constraint.