高校地质学报2024，Vol.30Issue(2)：157-164,8.DOI:10.16108/j.issn1006-7493.2023002
铜陵地区晚泥盆世五通组叶腊石的发现及其资源意义
Pyrophyllite Formation and Its Resource Implication in the Late Devonian Wutong Formation of Tongling Mineralization Cluster
摘要
Abstract
Yeshan iron deposit is a small-scale Carboniferous syn-sedimentary hydrothermally overprinted deposit in the Xinqiao ore field,Tongling mineralization cluster.In this paper,systematic mineralogical research has been carried out on sedimentary rocks of the Late Devonian Wutong Formation in Yeshan iron deposit using powder X-ray diffraction(XRD),scanning electron microscopy(SEM).Our results indicate that the dominant minerals in the Wutong Formation are detrital quartz and feldspar,and clay minerals including pyrophyllite,illite,and kaolinite,with some hematite and goethite.Higher average concentration of pyrophyllite in the studied Wutong sedimentary profile with from 7.54%to 70%occurs in the middle of the profile.Pyrophyllite in the samples shows micrometer scale euhedral to semi-euhedral block forms and grew around quartz particles.Pseudomorphic hexagonal prisms quartz particles consisting of lamellar pyrophyllite are also identified in the sedimentary rocks.The pyrophllite bearing ore compositions based on the XRF data show that the SiO2 content ranges from 44.47%to 80.23%,and Al2O3 from 10.49%to 28.75%.According to mineral assemblages and chemical compositions of the Wutong Formation sedimentary rocks from the Yeshan deposit,pyrophyllite bearing sedimentary rocks are proposed to be pyrophyllite ore and the ore belongs to silica-alumina pyrophyllite ores,which is an important raw clay mineral resource applied in the fields of ceramic raw material,refractory material,and alkali-free glass.The microstr uctures of the ore and the geological background of the mining area indicate that the pyrophyllite in the Wutong Formation may be the products of the reactivation of detrial kaolinite and quartz under Mesozoism.The finding of this study is an important for pyrophyllite ore prospecting in the Tongling region and the Middle-Lower Yangtze River Mineralization Belt which has similar ore-forming geological settings including the Wutong formation and Mesozoic magma.关键词
铜陵地区/五通组/叶腊石矿石/成因类型/非金属资源Key words
Tongling area/Wutong Foramtion/pyrophyllite ore/genesis type/nonmetallic resources分类
天文与地球科学引用本文复制引用
刘童,谢巧勤,徐亮,王家宇,周跃飞,陈天虎,徐晓春..铜陵地区晚泥盆世五通组叶腊石的发现及其资源意义[J].高校地质学报,2024,30(2):157-164,8.基金项目
国家自然科学基金项目(41672038 （）
41872043)资助 （）
