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古地理学报 ›› 2026, Vol. 28 ›› Issue (1): 278-289. doi: 10.7605/gdlxb.2026.022

• 岩相古地理学及沉积学 • 上一篇    下一篇

鲁西南YZK-3钻孔的盐类矿物和锶同位素组成及其地质意义*

李兆强1(), 李明慧2, 宋香锁3,4,5, 高黎明6, 唐璐璐3,4,5, 刘凤臣3,4,5, 杨斌3,4,5(), 余武生2, 路淑毅7, 张译文2   

  1. 1 山东省肥城市自然资源和规划局,山东肥城 271600
    2 中国科学院青藏高原研究所,北京 100101
    3 山东省地质科学研究院,山东济南 250013
    4 国土资源部金矿成矿过程与资源利用重点实验室,山东济南 250013
    5 山东省金属矿产成矿地质过程与综合利用重点实验室,山东济南 250013
    6 山东省曹县自然资源和规划局,山东曹县 274400
    7 河南省地震局,河南郑州 450018
  • 收稿日期:2025-04-10 修回日期:2025-05-04 出版日期:2026-02-01 发布日期:2026-02-09
  • 通讯作者: 杨斌,男,1975年生,研究员,研究方向为地质勘查找矿。E-mail: yangbin71311@163.com
  • 作者简介:

    李兆强,男,1972年生,高级工程师,研究方向为地质勘查找矿。E-mail:

Evaporates and strontium isotopes of borehole YZK-3 in southwest Shandong Province and their geological implications

LI Zhaoqiang1(), LI Minghui2, SONG Xiangsuo3,4,5, GAO Liming6, TANG Lulu3,4,5, LIU Fengchen3,4,5, YANG Bin3,4,5(), YU Wusheng2, LU Shuyi7, Zhang Yiwen2   

  1. 1 Feicheng Natural Resources and Planning Bureau of Shandong Province, Shandong Feicheng 271600,China
    2 Institute of Tibetan Plateau,Chinese Academy of Sciences,Beijing 100101, China
    3 Shandong Institute of Geological Sciences,Jinan 250013,China
    4 Key Laboratory of Gold Mineralization Processes and Resource Utilization,Ministry of land and Resources,Jinan 250013,China
    5 Key Laboratory of Metallogenic Geological Process and Resources Utilization in Shandong Province,Jinan 250013,China
    6 Cao County Natural Resources and Planning Bureau of Shandong Province,Shandong Caoxian 274400,China
    7 Henan Earthquake Agency,Zhengzhou 450018,China
  • Received:2025-04-10 Revised:2025-05-04 Online:2026-02-01 Published:2026-02-09
  • Contact: YANG Bin,born in 1975, researcher, is mainly engaged in research on geological survey and prospecting. E-mail: yangbin71311@163.com.
  • About author:

    LI Zhaoqiang,born in 1972, senior engineer, is mainly engaged in research on geological survey and prospecting. E-mail: .

摘要:

鲁西南黄岗潜凹陷发现了盐储量达到百亿吨级的古近纪盐类矿床,该矿床是中国东部罕见的超大型岩盐矿,深入研究该矿床成因对丰富中国的盐类矿床理论具有重要意义。本文选取YZK-3钻孔中519.9 m的含盐沉积物,从成因矿物学的角度,详细分析了矿物成因、成盐环境和成矿物质来源。盐类矿物中,碳酸盐矿物以方解石、白云石、铁白云石为主,文石少量; 硫酸盐矿物主要是硬石膏,少量石膏和天青石; 氯化物矿物只出现石盐一种矿物。根据这些矿物的分布特征和成因判断,始新世中晚期—渐新世时期古湖泊的演化过程为: 淡水湖—咸水湖—盐湖—咸水湖—淡水湖。石盐和硬石膏的87Sr/86Sr值为0.711227~0.71177,远高于同时代海水的。结合热液研究成果综合判断,黄岗潜凹陷成盐卤水中没有发现海相信息。除了岩石风化外,受大气降水影响的深部热液也是不可忽视的成盐物质来源。

关键词: 石盐, 石膏, 硬石膏, 锶同位素, 古近系, 黄岗潜凹陷

Abstract:

A massive Tertiary salt deposit containing 10 billion tons has been identified in the Huanggang buried sag of southwestern Shandong Province. This deposit is a rare super-large rock salt deposit in eastern China. To investigate the material sources and depositional environment of this salt formation,we conducted a comprehensive analysis of salt mineral assemblages,stratigraphic distributions,and 87Sr/86Sr isotopic compositions in halite and anhydrite from a 520-meter core(Borehole YZK-3)situated at the basin margin. Among the salt minerals,carbonate minerals mainly contained calcite,dolomite,ankerite and minor aragonite. Sulfate minerals contained anhydrite,with minor gypsum and celestite. Chloride minerals were composed of only halite. Based on their distribution and genesis,the paleolake evolution during the Middle-Late Eocene to Oligocene progressed through five distinct stages: freshwater→brackish→saline→brackish→freshwater lake systems. The87Sr/86Sr ratios measured in halite and anhydrite(0.711227-0.71177)significantly exceed contemporaneous seawater values. This isotopic disparity,combined with existing hydrothermal research data,demonstrates the absence of marine influences in the brine system.Substantial contributions from deep hydrothermal fluids mixed with meteoric waters was an important source of salt material.

Key words: halite, gypsum, anhydrite, strontium isotope, Paleogene, Huanggang buried sag

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