Analysis of the Tectono一sedimentary Setting of the Bolhinur Mt.Formation ( Upper Silurian ) in the Bolhinur Mt.Region，Xinjiang
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摘要: 新疆中天山西段的博罗霍洛山地区，在早古生代具有裂陷带性质。上志留统博罗霍洛山组形成于该裂陷带的最后闭合阶段，具有其特殊的形成时间和沉积特征。通过对该组地层的沉积学、岩石学及地球化学等方面的分析，本文较深入地讨论了其沉积环境及其沉积构造背景。认为该组岩石为浊流沉积物，其形成与活动性较强的大陆边缘区有着密切的关系，其陆源物质来源以当时存在于裂陷带以南的具有一定陆壳厚度和中等成熟度的“伊宁古陆”区为主。Abstract: The Bolhinur Mt.Formation of the Upper Silurian is widely distributed in the Bolhinur Mt.region.The Formation was formed in the closing stage of the Bolhinur Early Palaeozoic Aulacogen and is famous for its purplish red sediments.Having analysed sedimentologic，petrologic and petrochemical features, the author probes into the tectonic setting of the Bolhinur Mt.Formation of the Upper Silurian and concludes that the Fomation was turbidity current sediments and formed in close relationship with an active continental margin.The source area of the Fomation was mainly southern"Yining oldland",which had certain continental crust and middle maturity.
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