LA-ICP-MS Zircon U-Pb Dating, Elements and Sr-Nd-Hf Isotope Geochemistry of the Early Mesozoic Mafic Dyke Swarms in mas-microsoft-com:office:smarttags" />East Kunlun Orogenic Belt
详细信息
- 责任者：Xiong Fuhao (Faculty of Earth Sciences ; China University of Geosciences ; Wuhan 430074 ; China) ; Ma Changqian
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(11)
- 关键词：超镁铁质岩 ; ultramafics ; 铀—铅计时 ; U-Pb dating ; 同位素地球化学 ; isotope geochemistry ; 昆仑山 ; Kunlun Mountains
- 页码：p.3350-3364
- 图表：12 illus., 4 tables, 66 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
mary name="EnDivSummary">The Bairiqili mafic dyke swarms in East Kunlun are principally composed of noritegabbro, with minor porphyritic diabase. The LA-ICP-MS zircon U-Pb dating indicates that the mafic dykes were emplaced with age of (251±2) Ma. Geochemical and isotopic studies show that the mafic dykes were derived from EM2 that have been metasomatized by fluid. Tectonic setting analysis shows that the rocks have characteristics of island arc and/or mid-ocean ridge basalts, combined with the tectonic evolution of East Kunlun, the authors propose that the Bairiqili mafic dykes were derived from EM2 in a subduction environment, which was metasomatized by fluid and then,triggered to partial melting to form the mafic magma, at about 250 Ma, it took place back-arc extension in the north of the subduction zone, and then the mafic magma was rising to upper crust along the fissure to form the mafic dykes.
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