铜陵矿集区上石炭统碳酸盐岩矿物学与地球化学的区域对比研究

doi:10.16108/j.issn1006-7493.2022008

高校地质学报 ›› 2023, Vol. 29 ›› Issue (4): 514-526.DOI: 10.16108/j.issn1006-7493.2022008

• 岩石·矿物·地球化学 • 上一篇下一篇

铜陵矿集区上石炭统碳酸盐岩矿物学与地球化学的区域对比研究

王家宇^{1, 2}，徐亮^{1, 2}，谢巧勤^{1, 2*}，刘童^{1, 2}，周跃飞^{1, 2}，李振生¹，徐晓春¹，陈天虎^{1, 2}

1. 合肥工业大学资源与环境工程学院，合肥 230009；
2. 纳米矿物与污染控制安徽普通高校重点实验室，合肥 230009

出版日期:2023-08-15 发布日期:2023-08-15

Regional Comparative Study on Mineralogy and Geochemistry of Carbonate Rocks from the Upper Carboniferous in Tongling Ore District

WANG Jiayu^1,2，XU Liang^1,2，XIE Qiaoqin^1,2*，LIU Tong^1,2，ZHOU Yuefei^1,2，LI Zhensheng¹，XU Xiaochun¹，CHEN Tianhu^1,2#br#

1. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;
2. Key Laboratory of Nanomineralogy and Pollution Control of Anhui Higher Education Institutes, Hefei 230009, China

Online:2023-08-15 Published:2023-08-15

摘要/Abstract

摘要： 通过对安徽铜陵和巢湖上石炭统黄龙—船山组剖面碳酸盐岩矿物学和微量元素进行对比研究，结果表明：铜陵黄龙组底部为一套含草莓黄铁矿的白云岩，中、下部和船山组均是灰岩，矿物组合为：黄龙组底部的白云石+高岭石+黄铁矿+石英（黄龙组底部）→方解石+高岭石+石英（黄龙组中下部）→方解石+伊利石+石英（黄龙组上部和船山组）。而巢湖黄龙—船山组碳酸盐岩为一套含高岭石、石英的灰岩，但从黄龙组底部至船山组顶部剖面中高岭石有增加趋势。微量元素显示，铜陵黄龙—船山组碳酸盐（特别是黄龙组底部白云岩）的V/Cr、Ni/Co、V/Sc比值显著高于巢湖，且Ce与Fe、Mn的无相关性，显著不同于巢湖碳酸盐的正相关特征。矿物学和地球化学特征表明，铜陵黄龙组底部碳酸盐沉积于偏还原的环境，黄龙组中上部和船山组碳酸盐沉积于相对贫氧的环境，而巢湖碳酸盐则形成于更加氧化的环境。结合前人研究成果认为，早石炭世铜陵古岛的存在可能是导致铜陵沉积环境有别于巢湖的主要原因，该沉积环境为铜陵地区胶状黄铁矿形成的有利地质条件。

关键词: 上石炭统, 微量元素, 矿物学, 沉积环境, 安徽铜陵与巢湖

Abstract: This paper presents a mineralogical and element geochemical study of carbonate rocks of the Upper Carboniferous Huanglong-Chuanshan Formation section from Tongling and Chaohu, Anhui Province. The results show that (1) the base of Huanglong Formation in Tongling is a set of dolostone containing framboidal pyrite; (2) the lower part of Huanglong Formation to the top of Chuanshan Formation are limestones; and (3) from bottom to top of section, mineral associations are dolomite+kaolinite +pyrite+quartz at the bottom of the Huanglong Formation → calcite+kaolinite+quartz (the middle and lower Huanglong Formation) → calcite+illite+quartz (the upper Huanglong Formation and the Chuanshan Formation), respectively. However the Huanglong-Chuanshan Formation in Chaohu are limestones composed of calcite with kaolinite and quartz, and the content of kaolinite tends to increase from the bottom of Huanglong Formation to the top of Chuanshan Formation. Also, carbonates of the Huanglong-Chuanshan Formation in Tongling (especially the dolomites at the bottom of the Huanglong Formation) show much higher V/Cr, Ni/Co, and V/Sc ratios, and Ce and Fe, Mn are uncorrelated while these parameters are positively correlated for Chaohu carbonates. Mineralogical and geochemical features suggest that carbonates at the bottom of the Huanglong Formation in Tongling were deposited in a relatively stable reducing environment, whereas carbonates in the middle and upper Huanglong Formation and Chuanshan Formation were deposited in a stable and weak oxidizing environment, and carbonates in Chaohu were formed in a more oxidizing and high-energy volatile environment. Combined with the previous studies, this study suggests that the existence of the ancient island in Tongling may be the main reason why the sedimentary environment of Tongling is different from that in Chaohu. Also, the sedimentary environment in Tongling area is favorable for the formation of colloform Pyrite.

Key words: the Upper Carboniferous, mineralogy, trace element, sedimentary environment, Tongling and Chaohu, Anhui

中图分类号:

王家宇, 徐亮, 谢巧勤, 刘童, 周跃飞, 李振生, 徐晓春, 陈天虎. 铜陵矿集区上石炭统碳酸盐岩矿物学与地球化学的区域对比研究[J]. 高校地质学报, 2023, 29(4): 514-526.

WANG Jiayu, XU Liang, XIE Qiaoqin, LIU Tong, ZHOU Yuefei, LI Zhensheng, XU Xiaochun, CHEN Tianhu. Regional Comparative Study on Mineralogy and Geochemistry of Carbonate Rocks from the Upper Carboniferous in Tongling Ore District[J]. Geological Journal of China Universities, 2023, 29(4): 514-526.

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铜陵矿集区上石炭统碳酸盐岩矿物学与地球化学的区域对比研究

Regional Comparative Study on Mineralogy and Geochemistry of Carbonate Rocks from the Upper Carboniferous in Tongling Ore District

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