| 吕水,刘海龙,韦文国,许曼,杨爱雪,李彪,安梦莹,杨光.冀东迁安柳河峪 BIF铁矿床地球化学特征及其地质意义[J].矿产勘查,2025,16(6):1322-1334 |
| 冀东迁安柳河峪 BIF铁矿床地球化学特征及其地质意义 |
| Geochemical characteristics and geological significance of the Liuheyu BIF-hosted iron deposit in the Qian'an area of eastern Hebei Province |
| 投稿时间：2024-01-30 |
| DOI：10.20008/j.kckc.202506003 |
| 中文关键词: 冀东迁安 柳河峪 BIF铁矿 地球化学特征 成矿物质来源 |
| 英文关键词: Qian′an area of eastern Hebei Province Liuheyu BIF-hosted iron deposit geochemical character. |
| 基金项目:本文受河北省地质矿产勘查开发局科研项目(13000022P00329410109F)和河北省地质勘查项目(13000022P00F2D4101750)联合资助。 |
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| 中文摘要: |
| 柳河峪铁矿床位于冀东地区迁安铁矿成矿带北区东矿带中北部，矿体赋存于太古宇迁西群三屯营组变质岩中，矿石类型主要为条带状辉石磁铁石英岩。近年来，随着勘探程度的提高，在柳河峪铁矿床深部新发现了第二层矿体群，但研究程度较低，制约了区域成矿认识。本文通过对柳河峪铁矿床矿石的主微量及稀土元素分析探讨其成矿物质来源、成矿环境指示及矿床成因类型。结果表明柳河峪铁矿床深部、浅部铁矿石成矿物质来源及成矿环境基本一致，矿石的主要化学成分均为 TFe2O3和 SiO2，较低的 Al2O3和 TiO2等含量暗示其沉积作用过程中极少有陆缘碎屑物质加入，SiO2 -TiO2投图结果表明火山作用为 BIF矿石原岩的形成提供了物质来源。经 PAAS标准化后的稀土元素配分模式均呈现轻稀土相对亏损、重稀土相对富集的左倾配分模式，La、Y、Eu具明显的正异常，缺乏 Ce负异常，Sr/Ba＞1，(La/Yb)paas＜1，Y/Ho平均值为 |
| 英文摘要: |
| The Liuheyu iron deposit lies in the central-northern section of the eastern ore belt within the north. ern Qian’an metallogenic zone of eastern Hebei. Its orebodies occur in metamorphosed Santunying Formation rocksof the Archean Qianxi Group, and the predominant ore lithology is banded pyroxene –magnetite quartzite. Recentdeep drilling has revealed a second orebody horizon at Liuheyu, yet insufficient research on this deeper level con.strains our comprehension of the regional metallogenesis. This study investigates the sources of metallogenic mate.rial, indicators of the metallogenic environment, and the ore-forming type of the deposit by analyzing the major,trace, and rare earth element compositions of the Liuheyu iron ore. Our data reveal that deep and shallow Liuheyuores derive from similar material sources under comparable metallogenic conditions. Dominated by TFe2O3 and SiO2, and with low Al2O3 and TiO2 contents, the ores reflect negligible detrital influx. SiO2–TiO2 plotting further im.plicates contemporaneous volcanism as the primary source for the BIF protolith. The PAAS-normalized REE pat.terns all show a left-tilted distribution with relative depletion of light rare earth elements and relative enrichment ofheavy rare earth elements. La, Y, and Eu exhibit distinct positive anomalies, Ce shows no negative anomaly, Sr/Ba >1, (La/Yb)paas < 1, and the average Y/Ho is 40.49. Elemental ratio analyses and discrimination plots consistentlypoint to a combined seawater–high-temperature hydrothermal deposition for Liuheyu, dominated by marine inputover hydrothermal influence, and crystallization occurred under aNOxic paleo-marine conditions. On the basis of theintegrated data, the Liuheyu BIF is classified as an Algoma-type iron deposit closely associated with contemporane.ous volcanic activity. |
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