| 闽北羊角尾萤石矿成因:来自稀土、微量元素地球化学的证据 |
| |
| 关键词:fluorite deposit REE geochemistry mineralization Yangjiaowei |
| 基金项目:中国地质调查局地质调查项目(编号: DD20190816; DD20190606);中化地质矿山总局化工地质科技项目(编号: ZHDK202004);中央级公益性科研院所基本科研业务费专项(编号: KK2005) |
|
| 摘要点击次数: 1816 |
| 全文下载次数: 1207 |
| 摘要: |
| Evidence from REE and Trace Element Geochemistry for Genesis of Yangjiaowei Fluorite Deposit in Northern Fujian |
| The Yangjiaowei fluorite deposit occurs in the fracture zone of the Jurassic Lishan Formation pyroclastic rocks in Pucheng, northern Fujian. In this study, the geological and mineral characteristics and the rock geochemistry characteristics of the ores, wall rocks, and biotite granites in the mining area are investigated. The ∑REE of fluorite ore is in the range of 65.17×10–6~125.87×10–6; HREE is relatively enriched; δEu and δCe are not obviously abnormal, and Ni, Cd, Pb, and As are relatively enriched in crustal micronutrients. The fractionation of LREE and HREE in the pyroclastic rocks of the Lishan Formation in the wall rock is not obvious; the negative Eu anomaly is obvious; Sm/Nd ratio is close to that of fluorite, and the curve of the crustal micronutrient content is largely consistent with that of fluorite. The biotite granite shows LREE enrichment, HREE depletion, positive Eu anomaly, and negative Ce anomaly, and the Sm/Nd ratio is much less than that of fluorite. According to the characteristics of REEs and micronutrients and the diagrammatic interpretation of the deposit genesis, the main source of ore-forming materials of the Yangjiaowei fluorite ore are likely the Lishan Formation pyroclastic rocks, which are not obviously related to the Late Jurassic syenite granites. The ore-forming fluid underwent a long-term evolution after its formation. In this process, the fluid and the surrounding rock had fully reflected, Ca, F, and REE were reactivated, and the ore bodies were deposited in the structural fracture zone, therefore, implying that the Yangjiaowei fluorite deposit is a mesothermal–epithermal filling deposit. The study of the ore-forming material source of the Yangjiaowei fluorite deposit indicates that the Late Jurassic volcanic-sedimentary rock series is an important material source of the regional fluorite mineralization and is worth considering in mineral explorations. |
| JIN Song,WANG Chun-lian,GAO Li-yong,ZHANG Cheng-xin,WANG Zhan-bing,WANG Chang,MENG Du,SHANG Peng-qiang.2022.Evidence from REE and Trace Element Geochemistry for Genesis of Yangjiaowei Fluorite Deposit in Northern Fujian[J].Acta Geoscientica Sinica,43(3):371-382. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|