摘要
Electron microprobe chemical dating was carried out on monazites enclosed in two gen-erations of mineral paragenesis of St + Ky + Grt and Sil + And + Grt + St, respectively, from the Qinling Group. Two different ages, 520±23 Ma and 435±9 Ma, were obtained from these monazites. This indicates that the Qinling Group experienced a metamorphism during the Early Cambrian, which is probably in response to the Late Pan-African subduction-accretion tectonothermal event.
Electron microprobe chemical dating was carried out on monazites enclosed in two generations of mineral paragenesis of St ＋ Ky ＋ Grt and Sil ＋ And ＋ Grt ＋ St, respectively, from the Qinling Group. Two different ages, 520±2.3 Ma and 435±9 Ma were obtained from these monazites. This indicates that the Qinling Group experienced a metamorphism during the Early Cambrian, which is probably in response to the Late Pan-African subduction-accretion tectonothermal event.
基金
This work was supported by the National Natural Science Foundation of China(Grant Nos.40272030 and 40234052)
the Key Project of Ministry of Education of China(Grant No.104309).
关键词
化学年龄
电子显微探针
独居石
秦岭造山带
monazite, electron microprobe dating, Late Pan-Africanthermal event, Qinling Orogen.
