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江西吉泰盆地梅岗地区上白垩统周田组沉积特征与沉积模式
Sedimentary characteristics and depositional model of the Upper Cretaceous Zhoutian Formation in the Meigang area of the Jitai Basin, Jiangxi Province
ES评分0
| DOI | 10.20086/j.cnki.yskw.2025.4177 |
| 刊名 |
Acta Petrologica et Mineralogica
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| 年，卷(期) | 2025, 44(4) |
| 作者 |
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| 作者单位 |
1. 中国地质科学院地质研究所, 北京 100037; |
| 摘要 |
江西吉泰盆地上白垩统周田组赋存丰富的卤水型锂资源,其沉积演化与沉积模式尚存争议。本次工作在前人研究基础上,通过对吉泰盆地梅岗地区5口钻孔岩芯的精细描述,结合岩石学、矿物学和石膏硫同位素研究,分析周田组岩性组合特征,识别沉积相类型与沉积特征,总结其沉积演化过程。根据岩性组合和沉积构造特征,周田组地层可分为下部的滨-浅湖相和上部的盐湖相沉积。周田组沉积早期,沉积中心位于盆地东南的泰和与值夏一带,主要由砾岩、细砂岩、泥质粉砂岩和粉砂质泥岩组成;湖盆边缘发育冲积-河流相,向盆地内过渡为三角洲相,至湖盆沉积中心为滨-浅湖相。周田组沉积晚期,气候逐渐变干旱,湖水不断蒸发形成了盐湖环境,发育泥岩和石膏岩的韵律沉积,表明湖水周期性咸化和淡化转化的沉积过程。石膏岩的δ34S值为8.0‰~15.4‰,集中在10.1‰~12.8‰之间,指示其形成于开放的成盐环境,几乎未受到细菌还原作用的影响。梅岗地区含盐系地层向北西变厚,裂隙储层发育,显示了良好的卤水型锂矿找矿远景。
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| Abstract |
There are abundant brine-type lithium resources hosted in the Upper Cretaceous Zhoutian Formation of the Jitai Basin, Jiangxi Province. However, its sedimentary evolution and depositional model remain controversial. On the basis of previous studies, through the detailed description of the cores of five boreholes in Meigang area of the Jitai Basin, combined with petrology, mineralogy and sulfur isotopes of gypsum, the lithofacies associations were analyzed, sedimentary facies types and sedimentary characteristics were identified, and the sedimentary evolutionary processes of the Zhoutian Formation were summarized. According to the lithofacies associations and sedimentary structures, the sedimentary system of the Zhoutian Formation can be divided into shore-shallow lake sedimentary system in the lower part and salt lake sedimentary system in the upper part. In the early deposition stage of the Zhoutian Formation, the depositional center was located between Taihe and Zhixia areas in the southeast basin, and was mainly composed of conglomerate, fine sandstone, muddy siltstone and silty mudstone. The alluvian-fluvial facies developed at the edge of the lake basin, transitioning to delta facies in the intra-basin, and to the sedimentary center of the lake basin, shore-shallow lake facies. In the late deposition period of the Zhoutian Formation, the climate gradually became arid, and a salt lake environment was formed by the continuous evaporation of the lake water. The rhythmic deposition of mudstone and gypsum rocks was developed, indicating the periodic salinization and desalination process of the lake water. The δ34S value of gypsum is of 8.0‰~15.4‰, mainly concentrated in the range of 10.1‰~12.8‰, indicating that the gypsum was formed in an open salt-forming environment, and almost unaffected by the bacterial reduction process. In the Meigang area, the salt-bearing strata thicken towards the northwest, with well-developed fractured reservoirs, presenting a promising prospect for lithium brine-type deposit exploration.
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| 关键词 |
沉积演化；沉积模式；盐湖；硫同位素；吉泰盆地
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| KeyWord |
sedimentary evolution; depositional model; salt lake; sulfur isotope; Jitai Basin
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| 基金项目 | |
| 页码 | 788-802 |
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