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首页> 外文期刊>Journal of Asian earth sciences >Origin and palaeoenvironmental indications of Eocene to Oligocene primary lacustrine dolomite, Northern Tianshan Mountains, NW China
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Origin and palaeoenvironmental indications of Eocene to Oligocene primary lacustrine dolomite, Northern Tianshan Mountains, NW China

机译：农民的原产地和占奥甙原发性湖泊白云岩，北天山山脉，北方中国

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摘要

During the Eocene to Oligocene, lacustrine dolostone developed in the Anjihaihe Formation on the northern margin of the Tianshan Mountains in the southern Junggar Basin. Dolostone formation is usually restricted to specific environmental and geochemical conditions; therefore, dolostone contains considerable information on palaeoenvironment and palaeoclimate changes. Furthermore, this dolostone provides more information on the formation process and formation mechanisms of dolostone. The studied dolostone is white to greyish white and consists of dolomite crystals that are 3-10 mu m in size, homogeneous, subhedral to euhedral and nearly stoichiometric (with average Mg/Ca molar ratios of 0.97). The high Sr content (average 1996 ppm), relatively high delta O-18 values (average -1.8%) and co-occurrence with halite and gypsum reflect evaporative and saline conditions. The delta Mg-26 values of the dolostone range from -0.81 to -2.44%, with a mean of -1.78%. Strong positive correlations exist between the delta Mg-26 values and depth (r = 0.76) and the Mg isotope Rayleigh distillation model results, which indicates that delta Mg-26 fractionation occurred in conjunction with evaporation and that most of the Anjihaihe lacustrine dolomite developed in a natural environment at 25-50 degrees C. Moreover, evidence of microbes can be found covering the surface of the dolostone in the presence of a few framboids of pyrite. Additionally, clay layers in the dolostone are primarily composed of bentonite (40-60%) but also contain small amounts of montmorillonite (0.8-3.5%) and zeolite (0.1-0.5%). Detrital zircon ages of 40-44 Ma are presented for the first time for the Anjihaihe Formation. The results show that understanding the primary lacustrine dolostone is significant and essential to reconstructing the evolution of palaeoenvironments and synsedimentary volcanic activity in the northern Tianshan Mountains during the Eocene to Oligocene. This work also provides a possible model that explains the formation of the studied dolostone in an evaporative saline lacustrine environment.
机译：在ocene到少腺，在南部南部南部的天山山脉北边缘的北边缘开发了湖泊山梨酮。杜氏酮形成通常仅限于特定的环境和地球化学条件;因此，Dolostone包含有关古环境和古群的变化的相当大的信息。此外，该Dolostone提供了有关Dolostone的形成过程和形成机制的更多信息。研究的Dolostone是白色的，灰白色是白色，由白云石晶体组成，均为3-10μm，均匀，胎体到Euhedral和几乎是化学计量的（具有0.97的平均mg / ca molar比率）。高Sr含量（平均1996ppm），相对高的δO-18值（平均-1.8％）和宿蚁和石膏的共发生反射蒸发和盐水条件。 Dolostone的Delta Mg-26值范围为-0.81至-2.44％，平均为-1.78％。 ΔMg-26值和深度（r = 0.76）和Mg同位素瑞利蒸馏模型结果存在强的正相关性，这表明Delta Mg-26分馏与蒸发相结合，并且大多数Anjihaihe Lapustrine Dolomite开发此外，天然环境在25-50℃。此外，可以发现微生物的证据覆盖含有少量硫铁矿的含有少量的苔藓酮的表面。另外，苔藓甾酮中的粘土层主要由膨润土（40-60％）组成，但还含有少量蒙脱石（0.8-3.5％）和沸石（0.1-0.5％）。第一次为Anjihaihe形成提供了40-44 mA的Detrital锆石。结果表明，理解原发性湖泊床垫是重建植物在植物中北天山山脉的综合社会和综合保火山活动的重要且必不可少的。这项工作还提供了一种可能的模型，该模型解释了在蒸发的盐水曲线环境中形成了研究的Dolostone。

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  • 来源
    《Journal of Asian earth sciences》 |2020年第15期|104135.1-104135.19|共19页
  • 作者

    Wang Yizhe; Wu Chaodong; Fang Yanan; Ma Jian; Shen Bing; Huang Fang; Zhou Tianqi; Wang Jialin; Zhang Wei;

  • 作者单位

    Peking Univ Sch Earth & Space Sci Key Lab Orogen Belt & Crustal Evolut Minist Educ Beijing 100871 Peoples R China|Peking Univ Inst Oil & Gas Beijing 100871 Peoples R China;

    Peking Univ Sch Earth & Space Sci Key Lab Orogen Belt & Crustal Evolut Minist Educ Beijing 100871 Peoples R China|Peking Univ Inst Oil & Gas Beijing 100871 Peoples R China;

    Chinese Acad Sci Nanjing Inst Geol & Palaeontol Key Lab Econ Stratig & Palaeogeog Nanjing 210008 Peoples R China;

    Peking Univ Sch Earth & Space Sci Key Lab Orogen Belt & Crustal Evolut Minist Educ Beijing 100871 Peoples R China|MIT Dept Earth Atomospher & Planetary Sci 77 Massachusetts Ave Cambridge MA 02139 USA;

    Peking Univ Sch Earth & Space Sci Key Lab Orogen Belt & Crustal Evolut Minist Educ Beijing 100871 Peoples R China;

    Univ Sci & Technol China Sch Earth & Space Sci CAS Key Lab Crust Mantle Mat & Environm Hefei 230026 Peoples R China;

    Peking Univ Sch Earth & Space Sci Key Lab Orogen Belt & Crustal Evolut Minist Educ Beijing 100871 Peoples R China|Peking Univ Inst Oil & Gas Beijing 100871 Peoples R China;

    Peking Univ Sch Earth & Space Sci Key Lab Orogen Belt & Crustal Evolut Minist Educ Beijing 100871 Peoples R China;

    China Univ Petr Coll Geosci Beijing 102249 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Tianshan Mountains; Saline lake; Primary lacustrine dolostone; Mg isotope; Palaeoenvironments; Volcanic activity;

    机译：天山山;盐湖;原发性湖泊长酮酮;镁同位素;古环境;火山活动;

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