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首页> 外文期刊>Journal of Asian earth sciences >The major composition of a middle-late Eocene salt lake in the Yunying depression of Jianghan Basin of Middle China based on analyses of fluid inclusions in halite
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The major composition of a middle-late Eocene salt lake in the Yunying depression of Jianghan Basin of Middle China based on analyses of fluid inclusions in halite

机译：基于盐岩中流体包裹体的分析，中国中部江汉盆地云英凹陷中晚始新统盐湖的主要成分

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摘要

During the Cretaceous-Tertiary transition in eastern China, abundant halites formed in non-marine areas. Many continental salt deposits from inland salt lakes were formed in eastern China in faulted basins as a result of the northward movement and collision of the Indo-China Plate with the Eurasian Plate, including the Bohai Gulf Basin. However, a marine transgression versus a non-marine origin of these evaporites remains to be determined. Primary fluid inclusions trapped in halite deposits can directly record the composition of evaporated seawater or salt lake water, such as those in the Cretaceous halite in the Khorat Plateau (Laos and Thailand) area can resolve the origins of the evaporate deposits; recent fluid inclusions data in the Khorat Plateau coincide with the predicted secular variation of seawater and are comparable to other fluid inclusions in Cretaceous marine halite, indicating these fluid inclusions are directly related to a marine transgression. Our analyses in this study shows that the average K~+ Mg~(2+), and SO_4~(2-) contents are 8.8, 5.0, and 6.8 g/1, respectively, in the primary fluid inclusions in halite of middle-late Eocene from the Yunying depression of China. These numbers are much less than those in the contemporary Spanish primary fluid inclusions in halite precipitated from seawater (16.4, 36.3, and 12.5 g/1 for K~+, Mg~(2+), and SO_4~(2-), respectively). Furthermore, Br contents of all fluid inclusion samples in halite from the Yunying depression are lower than 2 ppm (vs. 55-58 ppm at the base of Spanish contemporary marine halite), and their δ~(37)C1 values range from -0.11‰ to +2.94‰ (vs. -0.09‰ to -0.24‰ in sylvite of Spanish deposit), indicating that the compositions of the middle-late Eocene brines trapped in halite in the Yunying depression of China are very different from those derived from the contemporary seawater, and are considered to be resulted from evaporation of an inland saline lake water with little influence of seawater.
机译：在中国东部的白垩纪-第三纪过渡时期，非海洋地区形成了大量的卤石。由于中印板块与欧亚板块（包括渤海湾盆地）的北移和碰撞，在东部东部断层盆地形成了许多内陆盐湖的大陆盐矿床。然而，这些蒸发物的海侵与非海起源仍有待确定。滞留在盐岩沉积物中的主要流体包裹体可以直接记录蒸发的海水或盐湖水的成分，例如在Khorat高原（老挝和泰国）地区的白垩纪盐岩中的那些可以解析蒸发沉积物的起源；霍拉特高原最近的流体包裹体数据与预测的海水长期变化相吻合，并且可与白垩纪海盐岩中的其他流体包裹体相媲美，这表明这些流体包裹体与海侵直接相关。我们在这项研究中的分析表明，在中部岩盐岩中的一次流体包裹体中，平均K〜+ Mg〜（2+）和SO_4〜（2-）含量分别为8.8、5.0和6.8 g / 1。中国云英凹陷的始新世晚期。这些数字远小于当代西班牙从海水中析出的盐岩中的主要流体包裹体中的K〜+，Mg〜（2+）和SO_4〜（2-）分别为16.4、36.3和12.5 g / 1。 ）。此外，云英凹陷盐岩中所有流体包裹体样品中的Br含量均低于2 ppm（与西班牙当代海洋盐岩底部的55-58 ppm相比），且δ〜（37）C1值范围为-0.11 ‰到+ 2.94‰（西班牙矿床的钾盐中为-0.09‰到-0.24‰），这表明中国云英凹陷的盐岩中捕集的中晚始新世卤水的成分非常不同。现代海水，被认为是由于内陆盐湖水蒸发而产生的，而对海水的影响很小。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第5期|97-105|共9页
  • 作者

    Fan-Wei Meng; A.R. Galamay; Pei Ni; Chun-He Yang; Yin-Ping Li; Qin-Gong Zhuo;

  • 作者单位

    State Key Laboratory of Paleobiology and Stratigraphy, Nanjing Institute of Geology and Paleontology. Chinese Academy of Sciences. Nanjing. China;

    Institute of Geology and Geochemistry of Combustible Minerals, NAS of Ukraine, Lviv, Ukraine;

    State Key Laboratory for Mineral Deposits Research, Institute of Geo-Fluid Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, China;

    State Key Laboratory of Geo-mechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, China;

    State Key Laboratory of Geo-mechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, China;

    Research Institute of Petroleum Exploration and Development, CNPC, Beijing, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Salt lake; Composition; Fluid inclusion; Halite; Eocene; Yunying depression;

    机译：盐湖;组成;流体包裹体;Halite;始新世云英抑郁症;

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