• 责任者：Gao Rui (College of Earth Sciences ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Xiao Long
• 刊名：Acta Petrologica Sinica
• 出版年：2013
• 卷期：29(10)
• 关键词：构造环境 ; tectonic setting ; 火成岩 ; igneous rocks ; 准噶尔盆地 ; Junggar Basin
• 页码：p.3413-3434
• 图表：13 illus., 2 tables, 135 refs.
• 分类号：0300
• issnNo：ISSN1000-0569
• isbnNo：CN11-1922/P

     West Junggar, as a crucial part of the Central Asian Orogenic Belt （CAOB）, has been paid a lot of attention by numerous scholars. Six ophiolitic m61ange belts, numerous granitoids and marie-intermediate dyke swarms outcrop in West Junggar, indicating how complex the Paleozoic tectonic evolution of West Junggar is. Although a great of improvements has been made, there are still many controversies, such as the formation time, rock assemblages and petrogenesis of diverse ophiolitic m61anges, the petrogenesis, tectonic setting and thermal mechanism of the I-type and A-type granitoids, the geochronology, petrogenesis, tectonic background and paleo-stress regime of mafic-intermediate dyke swarms, the Paleozoic geoebonological structure, the tectonic setting, the Pilanerozoic crustal growth, the basement and tectonic evolution of West Junggar, and so on. The author collects the reported data and summarizes on the ophiolitic m61ange, Paleozoic granitoids and intermediate-marie dyke swarms in West Junggar. Combining with the geological survey and geochemical work, we put forward several cognitions ： （ 1 ） Daerbute and Karamay ophiolitic m61anges that are derived from high degree partial melting of spinel-bearing Iherzolite, are formed in back-arc tectonic setting related with subduction. （2） C1 granitoids are the outcomes of subduction, Cz-P1 are generated in post-collisional background, while P2 granitoids are formed in within-plate setting. （3） The petrogenesis of I-type granitoids are subduction-related, while the A-type granitoids and marie- intermediate dyke swarms are post-collisional background-related. （4） The A-type granitoids are derived from the high degree of fractionated crystallization after the lower crust partial melting induced by upwelling mantle. Geochemically, the mafic-intermediate dyke swarms are featured as adakitie rocks or sanukite, which are most possibly from partial melting of remnant oceanic slab metasomatised by fluids or melts. （ 5 ） The mafic-iutermediate dyke swarms are formed a little later than that of the host granitoid, both of which are formed in post-collisional background in C2-P1, suggesting a Paleozoic stress regime with near North-South direction extension. （6） The Paleozoic tectonic settings of West Junggar are oceanic basin system in Devonian, subdietion in Early Carhonifernns_ nnst-collisional setting in Late Carhnnifemus-Earlv Permian and wlthin-nlate ,setting in Miclclle-Late Permian.