| 宫贯乾,陈杰,张义东,张文纲,李树朋,杨爱远,王殿良,刘佩欣.河北省平泉市大石湖萤石矿床成矿流体和矿物稀土元素特征及其对矿床成因的制约[J].矿产勘查,2025,16(7):1599-1609 |
| 河北省平泉市大石湖萤石矿床成矿流体和矿物稀土元素特征及其对矿床成因的制约 |
| Characteristics of ore-forming fluids and rare earth elements of fluorite deposit in Dashihu, Pingquan City, Hebei Province and their constraints on ore genesis |
| 投稿时间：2024-08-26 |
| DOI：10.20008/j.kckc.202507004 |
| 中文关键词: 萤石矿 流体包裹体 稀土元素 成矿物质来源 低温热液型矿床 |
| 英文关键词: fluorite deposit fluid inclusions rare earth element source of ore-forming materials low-temperature hydrothermal deposit |
| 基金项目:本文受河北省平泉市大石湖萤石矿成矿规律研究项目(华地勘四科[2023]第05号)资助。 |
|
| 摘要点击次数: 384 |
| 全文下载次数: 220 |
| 中文摘要: |
| 河北省平泉市大石湖萤石矿床大地构造处于华北地台之燕山造山带的马兰峪复式背斜，宽城构造单元的东北部，平坊—桑园大断裂东部侧，矿体主要赋存在中元古界雾迷山组四段及其与洪水庄组的接触带处，受北东向断裂构造控制。本文在对该矿床地质特征研究基础上，开展矿床流体包裹体、稀土元素地球化学特征研究。流体包裹体结果显示均一温度为 124.0~198.7 ℃，主要集中在 124~170 ℃，代表了矿床成矿流体的最佳温度，表明矿床形成于低温环境；稀土元素地球化学结果显示 4件萤石样品的 Y/Ho比值变化很小，其范围为 58.21~63.00；La/Ho比值为 2.89~8.88，样品均落在 Tb/La-Tb/Ca图解的热液成因区；萤石有弱的 Ce负异常和 Eu负异常；ΣREE为 8.42×10-6~12.39×10-6，平均为 10.35×10-6；LREE/HREE比值为 1.20~ 2.68，平均为 1.89；LaN/YbN比值为 1.12~3.49，平均为 2.28；δEu为 0.81~0.98，平均为 0.86；δCe为 0.78~0.82，平均为 0.81。结合矿床地质特征，本文认为河北省平泉市大石湖萤石矿床严格受地层控制，成矿物质 F和 Ca主要来源于大气降水对中酸性岩体和围岩地层的淋滤作用，矿床成因类型为低温热液型矿床。 |
| 英文摘要: |
| The geological structure of fluorite deposit in Dashihu, Pingquan City, Hebei Province is located inthe northeastern part of the Kuancheng tectonic unit, in the North China Platform, Yanshan Orogenic Belt, Malanyucomplex anticline, and on the eastern side of the Pingfang Sangyuan fault. The ore body is mainly located in thefourth section of the Wumishan Formation of the Middle Proterozoic and its contact zone with the HongshuizhuangFormation, controlled by a northeast trending fault structure. On the basis of studying the geological characteristicsof the deposit, the research was conducted on the fluid inclusions and geochemical characteristics of rare earth ele-ments in the deposit in this paper. The fluid inclusions results show a uniform temperature varying from 124.0 ℃ to 198.7 ℃, mainly between 124 ℃ and 170 ℃, representing the optimal temperature for the ore-forming fluid of thedeposit, indicating that the deposit was formed in a low-temperature environment. The geochemical results of rareearth elements show that the Y/Ho ratio of the four fluorite samples changes very little, ranging from 58.21 to 63.00.The La/Ho ratio is 2.89-8.88, and all samples fall within the hydrothermal genesis zone of Tb/La-Tb/Ca diagram.Fluorite exhibits weak Ce and Eu negative anomalies. ∑REE is 8.42×10-6-12.39×10-6, with an average of 10.35× 10-6. The LREE/HREE ratio ranges from 1.20 to 2.68, with an average of 1.89. The LaN/YbN ratio ranges from 1.12 to 3.49, with an average of 2.28. The δEu ranges from 0.81 to 0.98, with an average of 0.86. And the δCe is 0.78-0.82, with an average of 0.81. Based on the geological characteristics of the deposit, it is believed that the fluoritedeposit in Dashihu, Pingquan City, Hebei Province is strictly controlled by geological strata. The ore-forming mate-rials F and Ca mainly come from the leaching effect of atmospheric precipitation on the intermediate acidic rockmass and surrounding rock strata. The genesis type of the deposit is low-temperature hydrothermal type. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|