囊谦盆地贡觉组含膏盐地层粘土矿物组合特征及气候环境意义
Clay mineral assemblage characteristics and climate environment significance of gypsum-bearing strata in Gongjue Formation, Nangqian Basin
投稿时间:2018-12-26  修订日期:2019-02-25
DOI:
中文关键词:  囊谦盆地  贡觉组  粘土矿物分析  膏盐
英文关键词:Nangqian Basin  Gongjue Formation  clay mineral analysis  gypsum salt
基金项目:
作者单位邮编
赵廷仪 中国科学院青海盐湖研究所 810008
袁秦 中国科学院青海盐湖研究所
青海省盐湖地质与环境重点实验室 
810008
山发寿 中国科学院青海盐湖研究所 
安福元 中国科学院青海盐湖研究所 
吕爽 中国科学院青海盐湖研究所 
孙爱军 中国科学院青海盐湖研究所 
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中文摘要:
      囊谦盆地晚始新世贡觉组厚层红色含膏盐粉砂质泥岩,是研究青藏高原始新世古气候演化和含膏盐沉积环境的良好素材。本文采集囊谦盆地贡觉组约257m含膏盐地层的碎屑沉积物,研究其粘土矿物成分和组合特征及气候与沉积环境变化。结果显示,粘土矿物主要以伊利石(52.1%)为主,其次为绿泥石(8.1%)和高岭石(3.5%)。根据岩性特征及粘土矿物组合变化,剖面自下而上可划分为三个阶段,分别指示了暖湿-低盐度、冷干-高盐度、较暖湿-低盐度的气候和沉积环境。贡觉组气候与沉积环境受到青藏高原地区干湿交替变化大背景的影响。
英文摘要:
      The thick red gypsum-salt silty mudstone of Gongjue Formation in the late Eocene of the Nangqian Basin is a good material for studying the Eocene paleoclimate evolution and gypsum-salt depositional environment in the Qinghai-Tibet Plateau. Clastic sediments of the Gongjue Formation of the Nangqian Basin, about 257m gypsum-bearing salt strata, were collected to study the composition and composition of clay minerals and the changes of climate and sedimentary environment. The results show that illite (52.1%) is the main clay mineral, followed by chlorite (8.1%) and kaolinite (3.5%). According to the lithological characteristics and the change of clay mineral assemblage, the profile can be divided into three stages from bottom to top, indicating the climate and sedimentary environment of warm-wet-low salinity, cold-dry-high salinity, warm-wet-low salinity respectively. The climate and sedimentary environment of Gongjue Formation are influenced by the background of alternating wet and dry changes in the Qinghai-Tibet Plateau.
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