蚌埠隆起区东部变质块体的P—T条件及锆石年代学研究

发布时间：2018-05-06 03:36

  本文选题：含石榴子石花岗片麻岩 + 温度—压力(P—T)评价　； 参考：《地质论评》2017年02期

【摘要】：蚌埠隆起区是华北克拉通的重要组成部分,然而前人对于蚌埠隆起结晶基底形成的变质环境和时限分析相对较为薄弱,制约了人们全面理解该隆起的形成和演化过程。因此,本文在详细的野外地质调查基础上,对在蚌埠隆起东部朱顶—石门山地区新发现的含石榴子石花岗片麻岩进行了较为细致的岩相学、矿物化学测试分析以及LA-ICP-MS锆石U-Pb定年,运用不同的温压计方法进行P—T条件估计,得出该样品温压条件为736~788℃和0.76~0.89GPa,表明其形成于低压麻粒岩相条件。锆石定年分析记录了岩浆结晶和变质两期事件,它们对应的年龄分别为2562±34~2584±25Ma和2433±31~2436±24Ma。
[Abstract]:The Bengbu uplift is an important part of the North China Craton. However, the metamorphic environment and time limit analysis of the crystalline basement formation of Bengbu uplift is relatively weak, which restricts the overall understanding of the formation and evolution of the uplift. Therefore, on the basis of detailed field geological investigation, the new discovered granitic gneiss containing pomegranate in the eastern Zhuding-Shimenshan area of Bengbu uplift has been studied in detail. Mineral chemical analysis and LA-ICP-MS zircon U-Pb dating were used to estimate P-T conditions. The temperature and pressure conditions of the samples were 736 鈩，

本文编号：1850629