江西信丰县罗峰头粉石英矿床成因探讨及高纯石英资源潜力

秦克章; 周起凤; 邹心宇; 姚卓森

文章摘要

秦克章,周起凤,邹心宇,姚卓森.江西信丰县罗峰头粉石英矿床成因探讨及高纯石英资源潜力[J].矿产勘查,2026,17(8):1293-1309

江西信丰县罗峰头粉石英矿床成因探讨及高纯石英资源潜力

Genesis of the Luofengtou powdery quartz deposit in Xinfeng County, Jiangxi Province, and its potential for high-purity quartz resource

投稿时间：2026-07-01

DOI：10.20008/j.kckc.202608001

中文关键词: 粉石英高纯石英硅质岩风化淋滤江西信丰

英文关键词: powdery quartz potential for high-purity quartz siliceous rock weathering and leaching XinfengCounty in Jiangxi Province

基金项目:本文受国家自然科学基金项目(92462305)和江西省金泰矿业公司项目“信丰县罗峰头粉石英矿床地质成因研究”联合资助。

作者	单位
秦克章	中国科学院地质与地球物理研究所,岩石圈演化与环境演变全国重点实验室,北京 100029 中国科学院大学地球与行星科学学院,北京 100049
周起凤	应急管理大学,河北三河 065201 河北省地震动力学重点实验室,河北三河 065201
邹心宇	中国科学院地质与地球物理研究所,岩石圈演化与环境演变全国重点实验室,北京 100029
姚卓森	中国科学院地质与地球物理研究所,岩石圈演化与环境演变全国重点实验室,北京 100029 中国地质大学武汉资源学院,地质过程与成矿预测全国重点实验室,湖北武汉 430074

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中文摘要:

粉石英矿床是一种天然产出粉状石英的矿床，属风化残积型矿床，SiO₂含量为 95%~98%。粉石英是重要的非金属矿物原料，应用于耐磨材料、硅微粉、陶瓷、耐火材料等领域。江西产出十余处粉石英矿床，是中国报道最早也是最主要的粉石英产地。本文调查了江西信丰罗峰头粉石英矿床的地质特征，开展了粉石英矿石表面形貌以及矿区岩石/矿石主微量化学组成和碳氧同位素研究。罗峰头粉石英矿床赋存于下二叠统车头组，成矿母岩为硅质岩。矿体呈层状、似层状和不规则状，延伸较稳定，底板为大理岩和大理岩化灰岩。粉石英矿石包括微晶石英岩、块状粉石英、土状粉石英等。粉石英晶粒的解离程度较高，发育大量的细小溶蚀孔洞。根据岩石地球化学特征，如 Al/(Al+Fe+Mn)值、LaN/YbN值、U/Th值、REE页岩配分模式及 V含量等，车头组硅质岩表现出正常沉积硅质岩特征，与大陆边缘形成环境一致。结合矿区灰岩和大理岩的碳氧同位素结果，下二叠统车头组为海相碳酸盐岩-硅质岩建造。同时，与矿区白色硅质岩相比，矿区东南侧灰色硅质岩具有更高的∑REE及 TiO₂、Zr、Nb、Hf、Ta、Th含量、及更低的 U/Th值和 δU值，揭示罗峰头粉石英矿床发育的多层硅质岩在陆源物质和氧化还原条件方面存在差异。总体上，由硅质岩、微晶石英岩至粉石英，SiO₂含量升高，可达 99.48%，杂质元素含量降低，尤其是∑REE明显降低。综合分析硅质岩、微晶石英岩和粉石英的氧同位素组成、区域岩浆-热液活动、矿区所处的亚热带季风性湿润气候和地形地貌位置，认为重结晶和风化淋滤作用促进了硅质岩的 SiO₂纯化。稳定延伸的下二叠统车头组硅质岩、侏罗纪岩浆-热液活动的叠加改造作用以及强烈高效的风化淋滤作用，共同影响形成了具有高纯度 SiO₂的罗峰头粉石英矿床。粉石英矿床具有进一步开展高纯石英资源评价和相关提纯试验的潜力。

英文摘要:

Powdery quartz deposit naturally holds powdery quartz and belongs to weathering residual deposit with a SiO₂ content range of 95%-98%. Powdery quartz is an important non-metallic mineral raw material, used inwear-resistant material, silicon micro powdery, ceramics, refractory material and other fields. Jiangxi Province withseveral powdery quartz deposits is the earliest reported and the most significant source of powdery quartz in ourcountry. The Luofengtou powdery quartz deposit in Xinfeng County, Jiangxi Province, was investigated in this study.The geological characteristics were summarized and the surface morphology of powdery quartz, major and trace ele.ment compositions and C-O isotopes of rocks and ores were conducted. The Luofengtou powdery quartz deposit oc.curs in the early Permian Chetou Group and the parent rock is siliceous rock. The ore bodies are layered, layered-like, and irregular, with relatively stable extension, and the floor is composed of marble and marble limestone. Thepowdery quartz ores include micro-crystalline quartzite, blocky powdery quartz and soil-like powdery quartz. Basedon the geochemical statistics, including Al/(Al+Fe+Mn), LaN/YbN, U/Th values, NASC-normalized REE distributionpatterns and V content, etc., the siliceous rock of the Luofengtou deposit belongs to the normal deposition siliceousrock and formed in continental margin. Combined with the C-O isotopes of limestone and marble, the early PermianChetou group is a marine carbonate-siliceous rock formation. Compared with the white siliceous rock in miningarea, the grey siliceous rock in the southeast of mining area has high contents of ∑REE, TiO₂、Zr、Nb、Hf、Ta、Th and low values of U/Th and δU. Thus, there are multi layers of siliceous rocks in the Luofengtou powdery quartz de.posit and these siliceous rocks are different in terrestrial materials and redox conditions. From the siliceous rock,micro-crystalline quartzite to powdery quartz, the SiO₂ content increases, up to 99.48%, and the impurity elementcontent, especially ∑ REE, decreases. After the comprehensive analysis of the oxygen isotopes of siliceous rocks,micro-crystalline quartzite and powdery quartz, regional magma-hydrothermal activities, and the subtropical mon.soon humid climate and topography and landforms that the mining area located in, recrystallization and weatheringand leaching process are proposed to be related to SiO₂ purification of siliceious rocks. The stable extensional sili.ceous rock in the Early Permian Chetou group, superimposed transformation of Jurassic magma-hydrothermal activi.ties, and the strong and efficient weathering and leaching processes jointly influence and create the Luofengtou pow.dery quartz deposit with high-purity SiO₂. The powdery quartz deposits have the potential for further studies onevaluation of high-purity quartz resources and relevant purification experiments.

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