山西塔儿山-二峰山地区新民铁矿床Fe同位素特征及其成矿指示意义

相轩; 白洋; 冯志强; 任大陆; 白阳; 苗洪运; 王米; 侯建斌; 郝书清

doi:10.19509/j.cnki.dzkq.tb20220816

山西塔儿山-二峰山地区新民铁矿床Fe同位素特征及其成矿指示意义

doi: 10.19509/j.cnki.dzkq.tb20220816

相轩^1,,
白洋²,
冯志强^2, ,,
任大陆¹,
白阳²,
苗洪运¹,
王米¹,
侯建斌³,
郝书清⁴

1.
山西省地质勘查局二一三地质队有限公司, 山西临汾 041000
2.
太原理工大学地球科学与工程系, 太原 030024
3.
山西华冶勘测工程技术有限公司, 太原 030002
4.
山西省第三地质工程勘察院有限公司, 山西晋中 030620

基金项目:

山西省科技厅自然科学基金项目 201701D221022

山西省自然资源厅地勘基金项目晋地发[2020]32号

详细信息

作者简介:
相轩(1989－), 男, 工程师, 主要从事金属矿产地质勘查研究工作。E-mail: xiangxuan2012@126.com

通讯作者:
冯志强(1984—), 男, 副教授, 主要从事构造地质学研究工作。E-mail: fengzhiqiang@tyut.edu.cn

中图分类号: P618.31
计量
- 文章访问数: 470
- PDF下载量: 31
- 被引次数: 0
出版历程
- 收稿日期: 2022-03-14
- 录用日期: 2022-08-19
- 修回日期: 2022-08-16

Iron isotopic characteristics of the Xinmin Fe deposit in the Taershan-Erfengshan district, Shanxi Province: Implications for origin of Fe mineralization

1.
213 Geological Team Co. Ltd. of Shanxi Provincial Geological Prospecting Bureau, Linfen Shanxi 041000, China
2.
Department of Earth Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
3.
Shanxi Huaye Metallurgical Engineering Technology Co. Ltd., Taiyuan 030002, China
4.
Shanxi Third Geological Engineering Exploration Institute Co. Ltd., Jinzhong Shanxi 030620, China

摘要

摘要:
新民铁矿是晋南塔儿山-二峰山地区近年来接触交代型矿床最具代表性的矿产勘查成果之一, 查明其成矿铁质来源及矿化过程对其成矿具有指示意义。系统分析了新民铁矿见矿钻孔中蚀变闪长岩体、赋矿灰岩(白云岩)及不同类型磁铁矿样品的铁同位素组成。结果显示δ⁵⁶Fe分布范围分别为0.23‰, 0~0.19‰, -0.56‰~0.07‰。蚀变闪长岩体的铁同位素组成较上地壳δ⁵⁶Fe平均值(0.07‰)明显更重, 可能与矽卡岩/钠长石化过程中流体迁移相关, 轻铁同位素优先从岩体中淋滤而出。灰岩、白云岩的δ⁵⁶Fe变化范围较大, 且与磁铁矿的铁同位素组成有明显差异, 可能并非成矿铁元素的主要来源。磁铁矿相比于两类围岩明显富集轻铁同位素, 在钻孔剖面上呈现明显的从矿体的核部到边部变重趋势, 指示成矿流体从岩体淋滤、迁移, 并在灰岩地层中沉淀, 导致磁铁矿δ⁵⁶Fe与Fe含量之间呈现出明显的负相关性。本研究与前人针对矽卡岩型铁矿床Fe同位素的系统研究结果相一致, 为其接触交代成因的厘定提供了重要证据, 同时也预示着塔儿山-二峰山地区, 尤其是具有高δ⁵⁶Fe组成的蚀变闪长岩体, 可能具备开展富铁矿找矿工作的广阔前景。
- Fe同位素 /
- 矽卡岩型铁矿床 /
- 新民铁矿 /
- 塔儿山-二峰山地区
Abstract: Objective
The Xinmin contact-metasomatism iron deposit is one of the most representative achievements of resource surveys in recent years in the Taershan-Erfengshan area, southern Shanxi Province.Determining the metal source and Fe mineralization process of this deposit is of great significance for regional exploration in this area.
Methods
In this study, Fe isotopic compositions of the altered diorite, hosting limestone(dolomite) and different types of magnetite samples have been obtained.
Results
The results show that the altered diorite have δ⁵⁶Fe values(0.23‰) significantly heavier than the average value of the upper crust (0.07‰), which may be related to fluid migration during skarn/albitization, as the light iron isotope is preferably leached from the intrusions. The Ordovician limestone/dolomite samples have δ⁵⁶Fe values (0 to 0.19‰) obviously different from those of magnetite (-0.56‰ to 0.07‰), indicating that those sedimentary strata cannot be the major ore-metal source. Considering that magnetite samples have obviously light Fe isotopic ratios which also exhibit an obviously increasing trend from centre to margin of a specific ore body, we propose that the ore-forming fluid may have once interacted with the intrusions during fluid migration, followed by precipitation in the limestone stratum. This interpretation is also supported by the remarkable negative correlation between δ⁵⁶Fe and Fe content.
Conclusion
Our study is consistent with previous studies on Fe isotopes of skarn iron deposits, which provides important evidence for the origin of contact metasomatism. Furthermore, this study may also indicate that altered diorite with heavy δ⁵⁶Fe ratios in the Taershan-Erfengshan area may be potential targets for iron prospect.
- iron isotope /
- skarn-type iron deposit /
- Xinmin Fe deposit /
- Taershan-Erfengshan area
注释:

(所有作者声明不存在利益冲突)

HTML全文

图 1 华北板块区域地质简图(a)和山西省区域地质图(b) (据文献[31-33]修改)

Figure 1. Simplified tectonic map of the North China Craton (a) and geological map of Shanxi Province (b)

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图 2 塔儿山-二峰山地质略图

Figure 2. Geological sketch of Taershan-Erfengshan area

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图 3 新民铁矿围岩蚀变显微照片

a~b.围岩发育绿帘石化、绿泥石化；c.围岩碳酸盐化，原有的碳酸盐矿物重结晶；d.围岩碳酸盐化，石榴石具裂纹结构；e.围岩发育蛇纹石化；f.金云母蚀变岩中穿插后期碳酸盐脉，发育黄铁矿和闪锌矿等硫化物

Figure 3. Typical photomicrographs showing alteration the host rock in the Xinmin iron deposit

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图 4 塔儿山-二峰山地区新民铁矿联合剖面图

Figure 4. Combined cross sections of the Xinmin iron deposit in the Taershan-Erfengshan area

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图 5 新民铁矿岩心及显微图像

a.新民铁矿矿石，具稠密浸染状构造；b.矿脉与围岩的接触带，矿脉发育矽卡岩化蚀变；c.新民铁矿矿石矿物组成，矿石矿物主要为磁铁矿，金属硫化物包括黄铁矿、雌黄铁矿、闪锌矿及黄铜矿；d.磁铁矿的再平衡结构的背散射图像

Figure 5. Macroscopic and microscopoic characteristics of drill cores of the Xinmin iron deposit

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图 6 新民铁矿含铁矿物之间的Fe同位素分馏

Figure 6. Plot of measured δ⁵⁶Fe versus δ⁵⁷Fe of Fe-bearing minerals in the Xinmin iron deposit

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图 7 钻孔ZK5-3地层柱状图及全Fe质量分数和Fe同位素组成变化关系

Figure 7. Drill columnar section of borehole ZK5-3 and variation trends of iron isotopic compositions and total Fe contents

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图 8 新民铁矿及全国各矽卡岩型矿床全岩、单矿物Fe同位素组成(据文献[36, 47-48]修改)

Figure 8. Comparsion of iron isotopic compositions of Fe-bearing minerals and whole rocks from different skarn polymetallic deposit and Xinmin iron deposit

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图 9 样品Fe同位素与全铁质量分数相关性图解

Figure 9. Plot of measured FeO_T versus δ⁵⁶Fe of Fe-bearing minerals in the Xinmin iron deposit

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表 1 新民铁矿铁矿体特征

Table 1. Geological characteristics of the ore bodies in the Xinmin iron deposit

矿体编号	钻孔见矿厚度/m	平均品位/%		推测走向长度/m	推测延深/m	埋深/m	赋存标高/m
矿体编号	钻孔见矿厚度/m	TFe	MFe	推测走向长度/m	推测延深/m	埋深/m	赋存标高/m
Ⅰ	932.14~1 001.69	26	24	400	400	916~1 001.69	-486~-389
Ⅱ	997.91~1 024.35	20	18	200	400	974~1 024.35	-509~-446
Ⅲ	1 024.17~1 058.94	30	27	680	400	1 014~1 080	-560~-488
Ⅳ	1 055.92~1 103.86	37	34	400	400	1 042~1 120	-596~-524
Ⅴ	1 100.95~1 196.91	40	37	775	700	1 080~1 270	-754~-560
Ⅵ	1 222.22~1 223.82	21	20	200	200	1 022.22~1 246	-724~-697
Ⅶ	978.69~979.79	18	17	200	200	958~988	-465~-433
Ⅷ	1 231.56~1 235.81	191	17	200	200	1 200~1 260	-740~-676

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表 2 新民铁矿Fe同位素组成

Table 2. Iron isotopic compositions of minerals and wall rocks in the Xinmin iron deposit

样品编号	样品性质	δ⁵⁶Fe_IRMM014/‰	2σ	δ⁵⁷Fe_IRMM014/‰	2σ
21XM02	岩体	0.23	0.02	0.33	0.03
21XM04	岩体	0.23	0.04	0.34	0.05
21XM06	矿体	0.00	0.04	0.00	0.03
21XM07	矿体	0.01	0.03	0.01	0.03
21XM08	矿体	-0.56	0.03	-0.82	0.02
21XM09	矿体	-0.22	0.03	-0.33	0.03
21XM09	矿体	-0.18	0.02	-0.27	0.04
21XM10	矿体	-0.07	0.04	-0.11	0.04
21XM12	矿体	0.07	0.05	0.09	0.05
21XM14	奥陶纪灰岩	0.19	0.02	0.28	0.01
21XM17	奥陶纪灰岩	0.00	0.01	0.01	0.03
21XM21	矿体	-0.04	0.00	-0.06	0.02
21XM23	矿体	0.07	0.06	0.11	0.06
21XM26	白云岩	0.19	0.05	0.28	0.05
AGV-2	安山岩	0.10	0.03	0.14	0.02
BCR-2	玄武岩	0.09	0.02	0.13	0.01

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