摘要
古气候和古卤水温度条件与盐湖成钾有着密切的联系,定量化重建库车盆地早始新世成盐期古卤水温度演化特征对评价盆地成钾潜力具有重要的科学意义.因此,首次以库车盆地西部QL1井下始新统石盐岩为研究对象,在详细的岩相学研究的基础上,开展石盐原生流体包裹体均一温度的定量分析工作.分析结果显示,来自钻孔不同深度的6个样品共有135个均一温度数据,介于21.2~57.8℃,平均值为31.8℃,剖面垂向上自底向顶整体上呈现一个稍微升温的趋势.本研究测定的温度范围、平均温度以及最高温度特征均与同时期特提斯海水温度数据吻合,进一步说明温度数据的可靠性和合理性.另外,高温条件有利于水体发生强烈的蒸发浓缩作用,这点与库车盆地始新世初期沉积的巨厚蒸发岩系和钾盐矿物相符.
Paleoclimate and paleobrine temperature conditions are closely related to potassium formation in salt lakes.Quantitatively reconstructing evolution characteristics of paleobrine temperature during Early Eocene salt-forming period of the Kuqa basin has important scientific significance for evaluating the potash potential of the basin.In this paper it takes Lower Eocene rock salt of core QL1 which is located in the western Kuqa basin as research object for the first time.Based on the detailed petrographic research,the test and analysis of homogenization temperature of primary fluid inclusions of halite were carried out.The analysis results show that a total of 135 homogenization temperature data were obtained from six samples with different depths of the borehole,ranging from 21.2 to 57.8 ℃,with an average value of 31.8 ℃,the profile shows a slight warming trend from bottom to top in the vertical direction.The characteristics of homogenization temperature range,average homogenization temperature,and maximum homogenization temperature measured in this paper are consistent with the temperature data of the Tethys seawater in the same period,which further indicates reliability and rationality of homogenization temperature data.In addition,the high temperature condition is conducive to strong evaporation and concentration of water bodies,which is in good agreement with the thick evaporite series and potassium minerals deposited in the Early Eocene of the Kuqa basin.
作者
徐洋
曹养同
刘成林
Xu Yang;Cao Yangtong;Liu Chenglin(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China;MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China)
出处
《地球科学》
EI
CAS
CSCD
北大核心
2021年第11期4188-4196,共9页
Earth Science
基金
中国地质科学院基本科研业务费项目(No.YYWF201716)
国家自然科学基金项目(Nos.41902064,41902065,41602100)
中央公益性基本科研业务费项目(No.KK2016)
东华理工大学博士科研启动基金项目(No.DHBK2018029)。
关键词
卤水温度
石盐流体包裹体
早始新世
库车盆地
特提斯域
环境地质
brine temperature
halite fluid inclusion
Early Eocene
Kuqa basin
Tethys realm
environmental geology
