1 School of Ocean Sciences, China University of Geosciences, Beijing 100083, China
2 School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
3 No. 240 Institute of Nuclear Industry, The China National Nuclear Corporation, Shenyang 110032, China
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文章历史+
Received
Published
Revised
2025-09-19
2026-03-28
2025-11-19
Online Date
2026-06-02
PDF (12799K)
摘要
近年勘查表明,松辽盆地北部在砂岩型铀矿方面展现出巨大找矿潜力。区域内四方台组因砂体厚度适中、规模稳定、连通性更好,且上、下层之间存在稳定的隔水泥岩的条件成为主要的目的层位。以松辽盆地北部林甸地区四方台组的6口钻井岩芯为研究对象,通过电感耦合等离子体质谱(inductively coupled plasma mass spectrometry,ICP-MS)技术和CN元素分析仪测试了岩石样品的微量元素和总有机碳(total organic carbon,TOC)含量,分析了微量元素变化及其比值指示的沉积环境意义。结果表明:在研究区四方台组,总有机碳为0.05%~0.38%(含量较低),P/Ti比值为0.06~0.39,Th/U比值为0.17~33.3,δU大多小于1,V/Cr比值为0.31~9.04,V/(V+Ni)比值为0.31~0.92,Ni/Co比值为0.11~3.19,Sr/Ba比值为0.21~0.43,Sr/Cu比值为8.02~54.75。综合各项微量元素参数及比值表明,研究区四方台组沉积水体整体为富氧氧化环境,局部存在缺氧还原环境,沉积时期炎热干旱的古气候特征,整体处于陆相淡水沉积环境,具有低-中等的初始古生产力。岩石TOC含量与古生产力没有良好的相关性,推测可能是沉积时期富氧氧化的环境消耗了有机质,导致埋藏有机碳含量较低。
Abstract
Recent exploration in the northern Songliao Basin has demonstrated significant potential for sandstone-type uranium deposits, with the Sifangtai Formation being identified as the primary target layer due to its moderate sandbody thickness, stable scale, good connectivity, and effective overlying impermeable mudstone. Six drill cores from the Sifangtai Formation in the Lindian area were analyzed using inductively coupled plasma mass spectrometry(ICP-MS) and CN elemental analysis to determine trace element concentrations and total organic carbon (TOC) content. The results indicate that in the Sifangtai Formation of the study area, TOC content ranges from 0.05% to 0.38% (indicating low organic content), P/Ti ratios range from 0.06 to 0.39, Th/U ratios from 0.17 to 33.3, δU values are mostly less than 1, V/Cr ratios from 0.31 to 9.04, V/(V+Ni) ratios from 0.31 to 0.92, Ni/Co ratios from 0.11 to 3.19, Sr/Ba ratios from 0.21 to 0.43, and Sr/Cu ratios from 8.02 to 54.75. These geochemical indicators collectively suggest that the Sifangtai Formation was deposited in a continental freshwater setting under a generally oxygen-rich, oxidizing water column with localized reducing conditions, reflecting a hot and arid paleoclimate and low to moderate paleoproductivity. The lack of correlation between TOC and paleoproductivity is attributed to oxidative consumption of organic matter in the depositional environment, resulting in low preserved organic carbon.
WU Han, YANG Yong-qiang, LIU Bao-lin, LUO Min, WANG Dong-xu.
Geochemical Characteristics of Sifangtai Formation in Lindian Area of Northern Songliao Basin and Its Paleoenvironmental Significance[J].
Science Technology and Engineering, 2026, 26(9): 3674-3685 DOI:10.12404/j.issn.1671-1815.2506757
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