Weathering Characteristics of Sedimentary Source Area of Qiongzhusi Formation,Eastern Margin of Ancient Kangding-Yunnan Land:Case study of the Wulongcun section of Wuding district,Chuxiong city,Yunnan province,China
[Objective]The Qiongzhusi Formation in the Yangtze region is an essential horizon for shale gas explora-tion.This study was conducted to determine the weathering degree,paleoclimate,tectonic background and prove-nance of the sedimentary rock in the Qiongzhusi Formation at the eastern margin of the Ancient Kangding-Yunnan Land.[Methods]Quantitative geochemical data was obtained from profile measurement,sample collection and analy-sis for major elements and trace elements in the Wulongcun profile.[Results and Conclusions](1)The Qiongzhusi Formation sedimentary rock is mainly strongly weathered,and the climate of the provenance area was warm and hu-mid during the period of deposition.(2)The rock was mainly formed in a passive continental margin environment.The source rocks were formed in a continental island-arc environment.(3)The sedimentary rocks were mainly tuff,tuffaceous sandstone,slate and granite,together with some basic rocks of the Proterozoic Dongchuan Group,Huili and Tangdan Groups in the Ancient Kangding-Yunnan Land.
Ancient Kangding-Yunnan LandQiongzhusi Formationweathering degreepaleoclimateprovenance characteristicstectonic background
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