The isotopic compositions of basement in the Qilian fold belt and their geological implication
1 IntroductionThe Qilian fold belt is the important segment of Central Orogenic System (COS) of China. In past decades , previous studies of the Qilian orogenic belt have focussed mainly on Phanerozoic rocks, absence of studies Precambrian basements(Xu et al., 1994; Xia et al., 1996; Feng et al., 1996). Precambrian metamorphic rocks are widespread in the central-Qilian blocks of the Qilian fold belt, eg Huangyuan Group; Hualong Group; Maxianshan Group et, these metamorphic rocks are important science significance of the formation of the Qilianshan fold belt, whereas the debate on Precambrian basements in the Qilian fold belt, as to: ① the Neoarchean or Paleoproterozoic Huangyuan Group (BGMRQH, 1991), but Guo et al (2000) meterage zircon U-Pb ages are 900 Ma of the Huangyuan Group. ② Wan et al (2003) meterage the zircon U-Pb ages are (750±30) Ma of the potassium feldspar granite in the Hualong Group consider it formed from 800 Ma to 600Ma, nevertheless, Xu et al (2007) studies of zircon U-Pb ages of clastic rocks and the granitic gneiss in the Hualong Group, the data is 891-875Ma.
Gao Xiaofeng Li Wenyuan Zhao Donghong Guo zhouping
Xian institute of geology and mineral resources, Xian, 710054, China
国际会议
Xian International Ni-Cu(Pt) Deposit Symposium 2009(2009 西安·Ni-Cu(Pt)岩浆矿床国际学术研讨会)
西安
英文
212-213
2009-09-01（万方平台首次上网日期，不代表论文的发表时间）