• 责任者：Han Zhenzhe (State Key Laboratory of Geological Processes and Mineral Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Zhao Handong
• 刊名：Geoscience
• 出版年：2009
• 卷期：23(3)
• 关键词：侵入体 ; intrusions ; 杂岩 ; complexes ; 小兴安岭 ; Xiao Hinggan Mountains
• 页码：p.497-507
• 图表：8 illus., 4 tables, 30 refs.
• 分类号：0801
• issnNo：ISSN1000-8527
• isbnNo：CN11-2035/P

The Late Ordovician Helin intrusive complex in the southeast of Xiaoxinganling Mountains consists of a series of different rocks, including amphibole gabbro, (quartz) diorite, tonalite and monzonitic granite. Intrusive, inclusive and gradual transitional contact relationship has been recognized among different rock types. Some microgranular dioritic enclaves have been discovered in (quartz) diorite, tonalite and monzonitic granite. The intrusive complex is characterized by enrichment of large ion lithophile elements LILE (Ba, St, Rb) and HFS (U, Th, Zr, Ce) relative to primitive mantle, suggesting derivation of crust. In summary, petrographic petrochemical and geochemical characteristics of the Helin complex suggest mixed crust-mantle origin. It can be attributed to underplating of mafic magma in an active continent marginal arc setting.