Geochronology and geochemistry of the Triassic bimodal volcanic rocks and coeval A-type granites of the Olzit area, Middle Mongolia: Implications for the tectonic evolution of Mongol–Okhotsk Ocean
作者: Mingshuai ZhuFochin ZhangLaicheng MiaoMunkhtsengel BaatarChimedtseren AnaadShunhu YangXingbo Li
作者单位: 1Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2Mongolian University of Science and Technology, Ulaanbaatar 120646, Mongolia
3University of Chinese Academy of Sciences, Beijing 100049, China
刊名: Journal of Asian Earth Sciences, 2016, Vol.122 , pp.41-57
来源数据库: Elsevier Journal
DOI: 10.1016/j.jseaes.2016.03.001
关键词: BimodalA-type granitesLate triassicMongol–Okhotsk
原始语种摘要: Abstract(#br)The Olzit volcanism in Middle Mongolia comprises a bimodal suite of basalts and peralkaline rhyolites adjacent to the Main Mongolia Lineament. The basalts are characterized by enrichment in LILE and LREE, and depletion in HFSE with typical Sr–Nd isotopic signatures (εNd( t )=−2.50 to −0.38 and ( 87 Sr/ 86 Sr) i =0.7058–0.7063), indicating they were likely derived from partial melting of an enriched lithospheric mantle, modified by subducted slab-derived fluids. The rhyolites show a close affinity to A-type granites with enrichment in LILE and LREE, and depletion in Nb, Ta and Ti. They also show a significant negative Eu anomaly, and have εNd( t ) values ranging from 0.50 to 1.38 and initial 87 Sr/ 86...
全文获取路径: Elsevier  (合作)
影响因子:2.379 (2012)

  • bimodal 双峰的
  • tectonic 构造的
  • volcanic 火山的
  • geochemistry 地球化学
  • triassic 三叠期
  • coeval 同时代
  • Triassic 三叠纪
  • Middle 中级牌黄麻
  • evolution 进化