鄂尔多斯盆地西缘羊虎沟组微量元素地球化学特征及沉积环境指示意义
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P595

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国家自然科学(41872144);国家科技重大专项(2016ZX05046-002,2016ZX05047-005)


Geochemical characteristics of trace elements in Yanghugou Formation in the western margin of Ordos Basin and their implications for sedimentary environment
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National Natural Science (41872144); National Science and technology major projects (2016zx05046-002, 2016zx05047-005)

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    摘要:

    沉积岩中的各种微量元素在测定整个沉积岩的环境和演化过程中都有着很大的灵活性和敏感程度,是记录整个沉积岩演化过程的一个有效参数。鄂尔多斯盆地西缘羊虎沟组沉积厚度大,有机质含量高,是上石炭统油气所展现出来的新型层系,其中古水体环境和古气候对于恢复该区域历史时期羊虎沟组沉积的格局和成藏性研究有着十分重要的意义。对鄂尔多斯盆地西缘东部羊虎沟组不同层位的47件泥岩样品进行微量元素测试,选取对于泥岩沉积环境较为敏感的元素作为评价和判别的指标,如锶(Sr)、钡(Ba)、铀(U)、钍(Th)、钒(V)、镍(Ni)、钴(Co)等,并结合沉积学标志研究了盆地西缘羊虎沟组古盐度、氧化还原条件、古水深及古气候特征。结果表明:Li,Sr,Ni,Ga以及Sr/Ba数值表明该研究区处于淡水-微咸水环境,偶尔也会注入咸水;δU,U/Th,V/(V+Ni),V/Cr和Ni/Co数值表明研究区处于弱氧化弱还原-氧化环境,部分深水区可能存在还原环境; 综合沉积学标志及生物遗迹化石判断,羊虎沟组沉积期以浅水环境为主;Sr/Cu以及CaO/(MgO×Al2O3)值指示研究区在羊虎沟组时期处于北部及中部较炎热干燥、南部较温暖湿润的气候中。

    Abstract:

    All kinds of trace elements in sedimentary rocks have great flexibility and sensitivity in determining the environment and evolution process of sedimentary rocks, which is an effective parameter to record the evolution process of sedimentary rocks. Yanghugou formation in the western margin of Ordos Basin is a new type of stratigraphic system of Upper Carboniferous oil and gas with large thickness and high content of organic matter. The paleo water environment and paleoclimate are of great significance for the restoration of the sedimentary pattern and reservoir forming ability of yanghugou formation in this region. Trace elements of 47 mudstone samples from different horizons of yanghugou formation in the western margin of Ordos Basin were tested. Elements sensitive to sedimentary environment of mudstone were selected as evaluation and discrimination indicators, such as Sr, Ba, U, Th, V, Ni, Co, etc Ancient water depth and paleoclimate characteristics. The results show that: the values of Li, Sr, Ni, Ga and Sr / Ba indicate that the study area is in a freshwater brackish water environment, and occasionally saline water is injected; the values of δU, U / Th, V / (V + Ni), V / Cr and Ni / Co indicate that the study area is in a weak redox oxidation environment, and some deep water areas may have a redox environment; According to sedimentological indicators and trace fossils, the sedimentary period of yanghugou formation was dominated by shallow water environment; Sr/Cu and CaO / (MgO × Al2O3) values indicate that the study area was in a hot and dry climate in the north and central, and a warm and humid climate in the South during the yanghugou formation.

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陆雨诗,胡勇,侯云东,等. 鄂尔多斯盆地西缘羊虎沟组微量元素地球化学特征及沉积环境指示意义[J]. 科学技术与工程, 2021, 21(28): 11999-12009.
Lu Yushi, Hu Yong, Hou Yundong, et al. Geochemical characteristics of trace elements in Yanghugou Formation in the western margin of Ordos Basin and their implications for sedimentary environment[J]. Science Technology and Engineering,2021,21(28):11999-12009.

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  • 收稿日期:2021-03-23
  • 最后修改日期:2021-07-14
  • 录用日期:2021-06-09
  • 在线发布日期: 2021-09-29
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