| 河北秦皇岛柳江盆地新元古界海绿石矿物特征与形成环境研究——以鸡冠山长龙山组为例 |
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| 引用本文：褚庆忠,犹遵艳,林景昱,张宏远,韩森伟,高文龙,MKHAMZAISSA.2022.河北秦皇岛柳江盆地新元古界海绿石矿物特征与形成环境研究——以鸡冠山长龙山组为例[J].地球学报,43(1):25-37. |
| DOI：10.3975/cagsb.2021.092701 |
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| 基金项目:河北柳江盆地地质遗迹国家级自然保护区“柳江盆地野外地质实习资源开发;整合与管理项目”(编号: 冀林草发[2019]43号) |
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| 中文摘要:在河北秦皇岛柳江盆地鸡冠山新元古界青白口系长龙山组石英砂岩中发现有海绿石。对海绿石宏观特征分析表明, 砂岩中海绿石的含量随着颗粒直径的减小而增大, 含量大多为5%~20%。综合野外露头勘验、岩石薄片显微镜下观察和样品扫描电镜观察, 对海绿石微观特征分析表明, 长龙山组大多为晕边状和颗粒状, 也可见其他形态, 分析认为该区海绿石属于低成熟-成熟的层内准原地型海绿石。柳江盆地鸡冠山海绿石处于弱还原条件, 其形成环境为弱水动力浅海环境, 且沉积物补给慢, 沉积速率缓慢, 与现代海绿石沉积环境较为相似。本区海绿石的发现及研究, 对于进一步研究该区层序地层特征、地层格架及区域地层对比具有重要意义。 |
| 中文关键词:海绿石 鸡冠山 长龙山组 沉积环境 |
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| Mineral Characteristics and Formation Environment of Glauconite in Upper Archean of Liujiang Basin, Qinhuangdao, Hebei Province:A Case Study of Changlongshan Formation in Jiguanshan |
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| Abstract:Glauconite is found in the quartz sandstone of Upper Archean Qingkoubai Changlongshan Formation in Jiguanshan, Liujiang Basin, Qinhuangdao, Hebei Province. The analysis of the macroscopic characteristics of glauconite showed that the glauconite content in sandstone increases with the decrease in particle diameter, and the content is mostly 5%–20%. Based on field outcrop surveys, rock section microscopy observations, and sample scanning electron microscopy observations, the microscopic characteristics of glauconite in Changlongshan was determined to be mostly halo-edged and granular, although other forms were also observed. It is considered that the glauconite in this area belongs to low-mature quasi autochthographical glauconite in layers. The glauconite in Jiguanshan of Liujiang Basin is characterized by weak reduction, and its formation environment is a shallow water environment with weak hydrodynamic force, and its sediment supply and sedimentation are slow, which is similar to the modern glauconite sedimentary environment. The discovery and study of glauconite in this area is of great significance for further study of sequence stratigraphic characteristics, stratigraphic framework, and regional stratigraphic correlation. |
| keywords:glauconite Jiguanshan Changlongshan Formation sedimentary environment |
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