江陵凹陷南缘盐井-申津渡凹地始新统硫同位素特征及古气候和物质来源探讨
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长江大学地球科学学院,中国地质科学院矿产资源研究所,中国地质科学院矿产资源研究所,中国地质科学院矿产资源研究所,中国地质科学院矿产资源研究所,湖南地质矿产勘查开发局四0三队,长江大学地球科学学院,长江大学地球物理学院,中国地质大学(北京),长江大学地球物理学院

基金项目:

国家重点基础研究发展计划(973计划)、中央级公益性科研院所基本科研业务费专项、国家自然科学基金青年基金、中国地质调查局钾盐资源调查评价项目


Sulfur Isotopic Characteristics of Eocene Series in the Yanjing- Shenjindu Sub-depression in the Southern Jiangling Depression and Its Implication for Paleoclimate and Provenance
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The Academy of Earth Sciences at Yangtze University,Wuhan,The Ministry of Land and Resources is a Key Laboratory for Mineralization and Resource Evaluation,Institute of Mineral Resources of The Chinese Academy of Geological Sciences,Beijing,The Ministry of Land and Resources is a Key Laboratory for Mineralization and Resource Evaluation,Institute of Mineral Resources of The Chinese Academy of Geological Sciences,Beijing,The Ministry of Land and Resources is a Key Laboratory for Mineralization and Resource Evaluation,Institute of Mineral Resources of The Chinese Academy of Geological Sciences,Beijing,The Ministry of Land and Resources is a Key Laboratory for Mineralization and Resource Evaluation,Institute of Mineral Resources of The Chinese Academy of Geological Sciences,Beijing,Hunan geology and mineral exploration and development bureau 403 team,The Academy of Earth Sciences at Yangtze University,The Academy of Geophysic and Oil Resource at Yangtze University,China University of Geosciences,The Academy of Geophysic and Oil Resource at Yangtze University

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    摘要:

    江陵凹陷南缘盐井-申津渡凹地的早始新世新沟嘴组发育一套钙芒硝-石盐的蒸发岩系地层。岩相学和矿物学证据显示,含盐系地层的主要盐类矿物包括石盐、钙芒硝、硬石膏,形成于常年性的盐湖环境中。钙芒硝为原生-准同生的盐类矿物。根据盐类矿物的类型和沉积特征以及典型暖相盐类矿物(原生钙芒硝)的广泛发育,推断出盐井-申津渡凹地在新沟嘴组沉积时期的古气候为暖型。钙芒硝δ34S组成为25‰~33‰,高于同时期海水硫同位素(17‰~19‰),可能经受过细菌改造。除此之外,晚古新世-早始新世时,盐井-申津渡凹地的硫酸盐物质也有可能来源于西部较老时期的含硫酸盐地层。

    Abstract:

    A set of evaporite strata consisting of calcium glauberite and rock salt (halite) developed in the early Eocene Xingouzui Formation in the southern margin of the Jiangling depression. The mineralogical and mineralogical evidence shows that the main salt minerals in the salt- bearing strata include rock salt, calcium glauber and anhydrite, which all formed in the environment of perennial salt lake. Calcium glauber is a primary- quasi-synthetic salt mineral. According to the type of mineral salts and sedimentary characteristics and typical warm saline minerals (native) calcium mirabilite extensive development, Yanjing-Shenjindu sub- depression can be inferred in the sedimentary period of Xingouzui formation in the ancient climate for type. According to extensive development of salt minerals (such as calcium glauber) and their depositional type and characteristic, it can be inferred that the climate in the Yanjing- Shenjindu sub- depression was warm during the deposition of the Xingouzui Formation. The δ34S composition of calcium mirabilite is 25‰~33‰, much higher than that of the seawater sulfur isotope (17~19‰) in the same period, suggesting that calcium mirabilite may have undergone bacterial modification. In addition, during the period between Late PalaeoceneEarly Eocene, sulfates in the Yanjing-ShenJindu subdepression may originate from the older sulfite formation in the west.

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颜开,刘成林,王九一,王春连,徐海明,王春林,余小灿,孟令阳.2018.江陵凹陷南缘盐井-申津渡凹地始新统硫同位素特征及古气候和物质来源探讨[J].地质学报,92(8):1647-1660.
YAN Kai, LIU Chenlin, WANG Jiuyi, WANG Chunlian, XU Haiming, WANG Chunlin, YU Xiaocan, MENG Lingyang.2018. Sulfur Isotopic Characteristics of Eocene Series in the Yanjing- Shenjindu Sub-depression in the Southern Jiangling Depression and Its Implication for Paleoclimate and Provenance[J]. Acta Geologica Sinica,92(8):1647-1660.

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  • 收稿日期:2018-01-16
  • 最后修改日期:2018-03-26
  • 录用日期:2018-04-04
  • 在线发布日期: 2018-08-24