• 责任者：Zhang Lei (Faculty of Resource Department ; China University of Geosciences ; Wuhan 430074 ; China) ; Lü Xinbiao
• 刊名：Geology in China
• 出版年：2013
• 卷期：40(3)
• 关键词：A型花岗岩 ; A-type granite ; 内蒙古 ; Inner Mongolia
• 页码：p.869-884
• 图表：9 illus., 2 tables, 72 refs.
• 分类号：0801
• issnNo：ISSN1000-3657
• isbnNo：CN11-1167/P

     Late Paleozoic A-type granites are widely distributed in Hegenshan-Heihe segment of the Inner Mongolia-Greater Hinggan Mountains orogenic belt. Their tectonic environments and petrogenesis remain controversial. A-type granites in Hegenshan-Heihe segment were emplaced in Late carboniferous-Permian period(325～260Ma), and the magmatic activities entered into the peak period in Permian. The A-type granite belt is metaluminous or slightly peraluminous (A/CNK=0.89～1.13) and belongs to the high-K, calc-alkaline series. Researches show that the ancient Asian oceanic plate still subducted into the Siberia plate between Late carboniferous and Permian, so the subducton-related back-arc extensional environment is thought to have been responsible for the formation of Hegenshan-Heihe A-type granites. The continental back-arc extension was probably related to the subduction slab rollback or the break-off induced upwelling of hot asthenospheric mantle.